diff --git a/clients/client-accessanalyzer/AccessAnalyzerClient.ts b/clients/client-accessanalyzer/AccessAnalyzerClient.ts
index a93ef3107c1c2..f9c23f265187e 100644
--- a/clients/client-accessanalyzer/AccessAnalyzerClient.ts
+++ b/clients/client-accessanalyzer/AccessAnalyzerClient.ts
@@ -178,9 +178,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-accessanalyzer/runtimeConfig.shared.ts b/clients/client-accessanalyzer/runtimeConfig.shared.ts
index 515eb3bdea7c4..136d3c50892c9 100644
--- a/clients/client-accessanalyzer/runtimeConfig.shared.ts
+++ b/clients/client-accessanalyzer/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "access-analyzer",
+  serviceId: "access-analyzer",
 };
diff --git a/clients/client-acm-pca/ACMPCAClient.ts b/clients/client-acm-pca/ACMPCAClient.ts
index 718846b44ab7e..5e197d837534a 100644
--- a/clients/client-acm-pca/ACMPCAClient.ts
+++ b/clients/client-acm-pca/ACMPCAClient.ts
@@ -223,9 +223,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-acm-pca/runtimeConfig.shared.ts b/clients/client-acm-pca/runtimeConfig.shared.ts
index 9108e958895c1..2e28ba9a67837 100644
--- a/clients/client-acm-pca/runtimeConfig.shared.ts
+++ b/clients/client-acm-pca/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "acm-pca",
+  serviceId: "acm-pca",
 };
diff --git a/clients/client-acm/ACMClient.ts b/clients/client-acm/ACMClient.ts
index f2efdff044649..1ba3fef53d5a4 100644
--- a/clients/client-acm/ACMClient.ts
+++ b/clients/client-acm/ACMClient.ts
@@ -172,9 +172,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-acm/runtimeConfig.shared.ts b/clients/client-acm/runtimeConfig.shared.ts
index 1aaee2b66dc65..98d3276d0cff8 100644
--- a/clients/client-acm/runtimeConfig.shared.ts
+++ b/clients/client-acm/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "acm",
+  serviceId: "acm",
 };
diff --git a/clients/client-alexa-for-business/AlexaForBusinessClient.ts b/clients/client-alexa-for-business/AlexaForBusinessClient.ts
index c0100efb5a483..038500f442bcc 100644
--- a/clients/client-alexa-for-business/AlexaForBusinessClient.ts
+++ b/clients/client-alexa-for-business/AlexaForBusinessClient.ts
@@ -511,9 +511,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-alexa-for-business/runtimeConfig.shared.ts b/clients/client-alexa-for-business/runtimeConfig.shared.ts
index b8b52feb36573..21c6e072431e4 100644
--- a/clients/client-alexa-for-business/runtimeConfig.shared.ts
+++ b/clients/client-alexa-for-business/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "a4b",
+  serviceId: "a4b",
 };
diff --git a/clients/client-amplify/AmplifyClient.ts b/clients/client-amplify/AmplifyClient.ts
index ff75203239396..c70758d5374bf 100644
--- a/clients/client-amplify/AmplifyClient.ts
+++ b/clients/client-amplify/AmplifyClient.ts
@@ -256,9 +256,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-amplify/runtimeConfig.shared.ts b/clients/client-amplify/runtimeConfig.shared.ts
index fa4781c1d0ddb..744a37905a77c 100644
--- a/clients/client-amplify/runtimeConfig.shared.ts
+++ b/clients/client-amplify/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "amplify",
+  serviceId: "amplify",
 };
diff --git a/clients/client-amplifybackend/AmplifyBackendClient.ts b/clients/client-amplifybackend/AmplifyBackendClient.ts
index 1e71768b091fb..57c1ba5c2479f 100644
--- a/clients/client-amplifybackend/AmplifyBackendClient.ts
+++ b/clients/client-amplifybackend/AmplifyBackendClient.ts
@@ -202,9 +202,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-amplifybackend/runtimeConfig.shared.ts b/clients/client-amplifybackend/runtimeConfig.shared.ts
index 4557b401d32a8..fdea53c3326b7 100644
--- a/clients/client-amplifybackend/runtimeConfig.shared.ts
+++ b/clients/client-amplifybackend/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "amplifybackend",
+  serviceId: "amplifybackend",
 };
diff --git a/clients/client-api-gateway/APIGatewayClient.ts b/clients/client-api-gateway/APIGatewayClient.ts
index 8340da3071f3e..0ca741da0c6de 100644
--- a/clients/client-api-gateway/APIGatewayClient.ts
+++ b/clients/client-api-gateway/APIGatewayClient.ts
@@ -584,9 +584,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-api-gateway/runtimeConfig.shared.ts b/clients/client-api-gateway/runtimeConfig.shared.ts
index 9ae6361ca7540..e7db65a7d7d8d 100644
--- a/clients/client-api-gateway/runtimeConfig.shared.ts
+++ b/clients/client-api-gateway/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "apigateway",
+  serviceId: "apigateway",
 };
diff --git a/clients/client-apigatewaymanagementapi/ApiGatewayManagementApiClient.ts b/clients/client-apigatewaymanagementapi/ApiGatewayManagementApiClient.ts
index 10b89b682e3a1..f916a2e0b43fd 100644
--- a/clients/client-apigatewaymanagementapi/ApiGatewayManagementApiClient.ts
+++ b/clients/client-apigatewaymanagementapi/ApiGatewayManagementApiClient.ts
@@ -121,9 +121,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-apigatewaymanagementapi/runtimeConfig.shared.ts b/clients/client-apigatewaymanagementapi/runtimeConfig.shared.ts
index ff3b108101b8d..6af200f849407 100644
--- a/clients/client-apigatewaymanagementapi/runtimeConfig.shared.ts
+++ b/clients/client-apigatewaymanagementapi/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "apigateway",
+  serviceId: "apigateway",
 };
diff --git a/clients/client-apigatewayv2/ApiGatewayV2Client.ts b/clients/client-apigatewayv2/ApiGatewayV2Client.ts
index c23bb4cf68846..1aced5bc712bb 100644
--- a/clients/client-apigatewayv2/ApiGatewayV2Client.ts
+++ b/clients/client-apigatewayv2/ApiGatewayV2Client.ts
@@ -370,9 +370,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-apigatewayv2/runtimeConfig.shared.ts b/clients/client-apigatewayv2/runtimeConfig.shared.ts
index ff3b108101b8d..6af200f849407 100644
--- a/clients/client-apigatewayv2/runtimeConfig.shared.ts
+++ b/clients/client-apigatewayv2/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "apigateway",
+  serviceId: "apigateway",
 };
diff --git a/clients/client-app-mesh/AppMeshClient.ts b/clients/client-app-mesh/AppMeshClient.ts
index 404e02e4e2a16..b9fc0b6e18313 100644
--- a/clients/client-app-mesh/AppMeshClient.ts
+++ b/clients/client-app-mesh/AppMeshClient.ts
@@ -280,9 +280,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-app-mesh/runtimeConfig.shared.ts b/clients/client-app-mesh/runtimeConfig.shared.ts
index 4d6eddb0c6d83..4a93cd33d4c0d 100644
--- a/clients/client-app-mesh/runtimeConfig.shared.ts
+++ b/clients/client-app-mesh/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "appmesh",
+  serviceId: "appmesh",
 };
diff --git a/clients/client-appconfig/AppConfigClient.ts b/clients/client-appconfig/AppConfigClient.ts
index 2c4b0f06613d0..8bf768cb61628 100644
--- a/clients/client-appconfig/AppConfigClient.ts
+++ b/clients/client-appconfig/AppConfigClient.ts
@@ -262,9 +262,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-appconfig/runtimeConfig.shared.ts b/clients/client-appconfig/runtimeConfig.shared.ts
index 2144e1fe441b7..a8cb9ab665c58 100644
--- a/clients/client-appconfig/runtimeConfig.shared.ts
+++ b/clients/client-appconfig/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "appconfig",
+  serviceId: "appconfig",
 };
diff --git a/clients/client-appflow/AppflowClient.ts b/clients/client-appflow/AppflowClient.ts
index 619c6bd8216ef..eeeec77bc817e 100644
--- a/clients/client-appflow/AppflowClient.ts
+++ b/clients/client-appflow/AppflowClient.ts
@@ -193,9 +193,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-appflow/runtimeConfig.shared.ts b/clients/client-appflow/runtimeConfig.shared.ts
index 924a89fecdd49..18c60cd4a950a 100644
--- a/clients/client-appflow/runtimeConfig.shared.ts
+++ b/clients/client-appflow/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "appflow",
+  serviceId: "appflow",
 };
diff --git a/clients/client-appintegrations/AppIntegrationsClient.ts b/clients/client-appintegrations/AppIntegrationsClient.ts
index 03ad12c508a03..f9aa5a5b5da06 100644
--- a/clients/client-appintegrations/AppIntegrationsClient.ts
+++ b/clients/client-appintegrations/AppIntegrationsClient.ts
@@ -163,9 +163,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-appintegrations/runtimeConfig.shared.ts b/clients/client-appintegrations/runtimeConfig.shared.ts
index ac0aeac465bf4..da8e9c47af2d4 100644
--- a/clients/client-appintegrations/runtimeConfig.shared.ts
+++ b/clients/client-appintegrations/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "app-integrations",
+  serviceId: "app-integrations",
 };
diff --git a/clients/client-application-auto-scaling/ApplicationAutoScalingClient.ts b/clients/client-application-auto-scaling/ApplicationAutoScalingClient.ts
index 6e6fbfdf718d0..5fd6341b8b824 100644
--- a/clients/client-application-auto-scaling/ApplicationAutoScalingClient.ts
+++ b/clients/client-application-auto-scaling/ApplicationAutoScalingClient.ts
@@ -169,9 +169,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-application-auto-scaling/runtimeConfig.shared.ts b/clients/client-application-auto-scaling/runtimeConfig.shared.ts
index 58e4eabf60ffe..00210488ae4c9 100644
--- a/clients/client-application-auto-scaling/runtimeConfig.shared.ts
+++ b/clients/client-application-auto-scaling/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "application-autoscaling",
+  serviceId: "application-autoscaling",
 };
diff --git a/clients/client-application-discovery-service/ApplicationDiscoveryServiceClient.ts b/clients/client-application-discovery-service/ApplicationDiscoveryServiceClient.ts
index d2e77d2a8a6bd..39bc42bae53c2 100644
--- a/clients/client-application-discovery-service/ApplicationDiscoveryServiceClient.ts
+++ b/clients/client-application-discovery-service/ApplicationDiscoveryServiceClient.ts
@@ -235,9 +235,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-application-discovery-service/runtimeConfig.shared.ts b/clients/client-application-discovery-service/runtimeConfig.shared.ts
index f1081d2952fdb..d1b37933dd80b 100644
--- a/clients/client-application-discovery-service/runtimeConfig.shared.ts
+++ b/clients/client-application-discovery-service/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "discovery",
+  serviceId: "discovery",
 };
diff --git a/clients/client-application-insights/ApplicationInsightsClient.ts b/clients/client-application-insights/ApplicationInsightsClient.ts
index 4cbde13df17e5..bfbf8a8e32601 100644
--- a/clients/client-application-insights/ApplicationInsightsClient.ts
+++ b/clients/client-application-insights/ApplicationInsightsClient.ts
@@ -220,9 +220,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-application-insights/runtimeConfig.shared.ts b/clients/client-application-insights/runtimeConfig.shared.ts
index 7c640f5ac53a6..69d9688686966 100644
--- a/clients/client-application-insights/runtimeConfig.shared.ts
+++ b/clients/client-application-insights/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "applicationinsights",
+  serviceId: "applicationinsights",
 };
diff --git a/clients/client-appstream/AppStreamClient.ts b/clients/client-appstream/AppStreamClient.ts
index f78d4f5b5e363..18da3ac1171a6 100644
--- a/clients/client-appstream/AppStreamClient.ts
+++ b/clients/client-appstream/AppStreamClient.ts
@@ -310,9 +310,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-appstream/runtimeConfig.shared.ts b/clients/client-appstream/runtimeConfig.shared.ts
index cd1610b3a45eb..394bd29bd44f2 100644
--- a/clients/client-appstream/runtimeConfig.shared.ts
+++ b/clients/client-appstream/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "appstream",
+  serviceId: "appstream",
 };
diff --git a/clients/client-appsync/AppSyncClient.ts b/clients/client-appsync/AppSyncClient.ts
index 63fbf3e7a2ff7..d649b1522cbf1 100644
--- a/clients/client-appsync/AppSyncClient.ts
+++ b/clients/client-appsync/AppSyncClient.ts
@@ -253,9 +253,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-appsync/runtimeConfig.shared.ts b/clients/client-appsync/runtimeConfig.shared.ts
index f9250a2a4121f..d286843ea9bcf 100644
--- a/clients/client-appsync/runtimeConfig.shared.ts
+++ b/clients/client-appsync/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "appsync",
+  serviceId: "appsync",
 };
diff --git a/clients/client-athena/AthenaClient.ts b/clients/client-athena/AthenaClient.ts
index 74f6d1fd26340..cd10b0250f8c2 100644
--- a/clients/client-athena/AthenaClient.ts
+++ b/clients/client-athena/AthenaClient.ts
@@ -211,9 +211,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-athena/runtimeConfig.shared.ts b/clients/client-athena/runtimeConfig.shared.ts
index a7725c1354202..1fb37526c5a34 100644
--- a/clients/client-athena/runtimeConfig.shared.ts
+++ b/clients/client-athena/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "athena",
+  serviceId: "athena",
 };
diff --git a/clients/client-auditmanager/AuditManagerClient.ts b/clients/client-auditmanager/AuditManagerClient.ts
index e0d1b7b4e9647..edacc451bb473 100644
--- a/clients/client-auditmanager/AuditManagerClient.ts
+++ b/clients/client-auditmanager/AuditManagerClient.ts
@@ -352,9 +352,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-auditmanager/runtimeConfig.shared.ts b/clients/client-auditmanager/runtimeConfig.shared.ts
index ead9805af9086..e87fef27cf30c 100644
--- a/clients/client-auditmanager/runtimeConfig.shared.ts
+++ b/clients/client-auditmanager/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "auditmanager",
+  serviceId: "auditmanager",
 };
diff --git a/clients/client-auto-scaling-plans/AutoScalingPlansClient.ts b/clients/client-auto-scaling-plans/AutoScalingPlansClient.ts
index 4933bb56b0c08..3c9aa934fa14e 100644
--- a/clients/client-auto-scaling-plans/AutoScalingPlansClient.ts
+++ b/clients/client-auto-scaling-plans/AutoScalingPlansClient.ts
@@ -142,9 +142,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-auto-scaling-plans/runtimeConfig.shared.ts b/clients/client-auto-scaling-plans/runtimeConfig.shared.ts
index 4d4ddc6098f62..2186e065d2166 100644
--- a/clients/client-auto-scaling-plans/runtimeConfig.shared.ts
+++ b/clients/client-auto-scaling-plans/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "autoscaling-plans",
+  serviceId: "autoscaling-plans",
 };
diff --git a/clients/client-auto-scaling/AutoScalingClient.ts b/clients/client-auto-scaling/AutoScalingClient.ts
index df97bb8002013..a91d682fb91f6 100644
--- a/clients/client-auto-scaling/AutoScalingClient.ts
+++ b/clients/client-auto-scaling/AutoScalingClient.ts
@@ -409,9 +409,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-auto-scaling/runtimeConfig.shared.ts b/clients/client-auto-scaling/runtimeConfig.shared.ts
index 156f42719ef6f..6de3352a0c3ec 100644
--- a/clients/client-auto-scaling/runtimeConfig.shared.ts
+++ b/clients/client-auto-scaling/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "autoscaling",
+  serviceId: "autoscaling",
 };
diff --git a/clients/client-backup/BackupClient.ts b/clients/client-backup/BackupClient.ts
index 95592c8d179c3..7a7fbfd06fb78 100644
--- a/clients/client-backup/BackupClient.ts
+++ b/clients/client-backup/BackupClient.ts
@@ -349,9 +349,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-backup/runtimeConfig.shared.ts b/clients/client-backup/runtimeConfig.shared.ts
index 7001fe53cdcfb..471596c3cda86 100644
--- a/clients/client-backup/runtimeConfig.shared.ts
+++ b/clients/client-backup/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "backup",
+  serviceId: "backup",
 };
diff --git a/clients/client-batch/BatchClient.ts b/clients/client-batch/BatchClient.ts
index 59909a41a0c75..691a2bc37497b 100644
--- a/clients/client-batch/BatchClient.ts
+++ b/clients/client-batch/BatchClient.ts
@@ -196,9 +196,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-batch/runtimeConfig.shared.ts b/clients/client-batch/runtimeConfig.shared.ts
index 11bc9ae6308a0..11085833b02b6 100644
--- a/clients/client-batch/runtimeConfig.shared.ts
+++ b/clients/client-batch/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "batch",
+  serviceId: "batch",
 };
diff --git a/clients/client-braket/BraketClient.ts b/clients/client-braket/BraketClient.ts
index 7549f4825baa1..2e7d2a5a2ad4b 100644
--- a/clients/client-braket/BraketClient.ts
+++ b/clients/client-braket/BraketClient.ts
@@ -133,9 +133,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-braket/runtimeConfig.shared.ts b/clients/client-braket/runtimeConfig.shared.ts
index e7e38b1993927..41b280f4103c4 100644
--- a/clients/client-braket/runtimeConfig.shared.ts
+++ b/clients/client-braket/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "braket",
+  serviceId: "braket",
 };
diff --git a/clients/client-budgets/BudgetsClient.ts b/clients/client-budgets/BudgetsClient.ts
index 1205fc7439a4c..d454cd98094b5 100644
--- a/clients/client-budgets/BudgetsClient.ts
+++ b/clients/client-budgets/BudgetsClient.ts
@@ -205,9 +205,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-budgets/runtimeConfig.shared.ts b/clients/client-budgets/runtimeConfig.shared.ts
index e28fa156dcc2a..e11d6ab7bba20 100644
--- a/clients/client-budgets/runtimeConfig.shared.ts
+++ b/clients/client-budgets/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "budgets",
+  serviceId: "budgets",
 };
diff --git a/clients/client-chime/ChimeClient.ts b/clients/client-chime/ChimeClient.ts
index e20098421694d..2f185513876b9 100644
--- a/clients/client-chime/ChimeClient.ts
+++ b/clients/client-chime/ChimeClient.ts
@@ -973,9 +973,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-chime/runtimeConfig.shared.ts b/clients/client-chime/runtimeConfig.shared.ts
index 08290a2246a44..16d5467bd5761 100644
--- a/clients/client-chime/runtimeConfig.shared.ts
+++ b/clients/client-chime/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "chime",
+  serviceId: "chime",
 };
diff --git a/clients/client-cloud9/Cloud9Client.ts b/clients/client-cloud9/Cloud9Client.ts
index 3886baa745a45..7ec692732ccfa 100644
--- a/clients/client-cloud9/Cloud9Client.ts
+++ b/clients/client-cloud9/Cloud9Client.ts
@@ -178,9 +178,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cloud9/runtimeConfig.shared.ts b/clients/client-cloud9/runtimeConfig.shared.ts
index 3b8fd12a82b81..5c0b3d752728a 100644
--- a/clients/client-cloud9/runtimeConfig.shared.ts
+++ b/clients/client-cloud9/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "cloud9",
+  serviceId: "cloud9",
 };
diff --git a/clients/client-clouddirectory/CloudDirectoryClient.ts b/clients/client-clouddirectory/CloudDirectoryClient.ts
index b281c13a5be70..9eac936b7b7d4 100644
--- a/clients/client-clouddirectory/CloudDirectoryClient.ts
+++ b/clients/client-clouddirectory/CloudDirectoryClient.ts
@@ -391,9 +391,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-clouddirectory/runtimeConfig.shared.ts b/clients/client-clouddirectory/runtimeConfig.shared.ts
index b9c81701b6874..f38bc49b20bbe 100644
--- a/clients/client-clouddirectory/runtimeConfig.shared.ts
+++ b/clients/client-clouddirectory/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "clouddirectory",
+  serviceId: "clouddirectory",
 };
diff --git a/clients/client-cloudformation/CloudFormationClient.ts b/clients/client-cloudformation/CloudFormationClient.ts
index 94bdd2bcb0bf7..29d94f6946c38 100644
--- a/clients/client-cloudformation/CloudFormationClient.ts
+++ b/clients/client-cloudformation/CloudFormationClient.ts
@@ -349,9 +349,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cloudformation/runtimeConfig.shared.ts b/clients/client-cloudformation/runtimeConfig.shared.ts
index 49f739c8ab457..922149a6b2ca1 100644
--- a/clients/client-cloudformation/runtimeConfig.shared.ts
+++ b/clients/client-cloudformation/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "cloudformation",
+  serviceId: "cloudformation",
 };
diff --git a/clients/client-cloudfront/CloudFrontClient.ts b/clients/client-cloudfront/CloudFrontClient.ts
index 24c3ac14a7420..c4439a9ee3e15 100644
--- a/clients/client-cloudfront/CloudFrontClient.ts
+++ b/clients/client-cloudfront/CloudFrontClient.ts
@@ -484,9 +484,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cloudfront/runtimeConfig.shared.ts b/clients/client-cloudfront/runtimeConfig.shared.ts
index b4be48845831c..3f1249e608762 100644
--- a/clients/client-cloudfront/runtimeConfig.shared.ts
+++ b/clients/client-cloudfront/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "cloudfront",
+  serviceId: "cloudfront",
 };
diff --git a/clients/client-cloudhsm-v2/CloudHSMV2Client.ts b/clients/client-cloudhsm-v2/CloudHSMV2Client.ts
index e9bd18eae40ad..08678390b7c63 100644
--- a/clients/client-cloudhsm-v2/CloudHSMV2Client.ts
+++ b/clients/client-cloudhsm-v2/CloudHSMV2Client.ts
@@ -163,9 +163,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cloudhsm-v2/runtimeConfig.shared.ts b/clients/client-cloudhsm-v2/runtimeConfig.shared.ts
index 67abeb062e062..37868874f2d31 100644
--- a/clients/client-cloudhsm-v2/runtimeConfig.shared.ts
+++ b/clients/client-cloudhsm-v2/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "cloudhsm",
+  serviceId: "cloudhsm",
 };
diff --git a/clients/client-cloudhsm/CloudHSMClient.ts b/clients/client-cloudhsm/CloudHSMClient.ts
index d50c6b1291f3e..dfdd061ee05f2 100644
--- a/clients/client-cloudhsm/CloudHSMClient.ts
+++ b/clients/client-cloudhsm/CloudHSMClient.ts
@@ -181,9 +181,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cloudhsm/runtimeConfig.shared.ts b/clients/client-cloudhsm/runtimeConfig.shared.ts
index 2ba3709edca4f..1cd9388dbb6ab 100644
--- a/clients/client-cloudhsm/runtimeConfig.shared.ts
+++ b/clients/client-cloudhsm/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "cloudhsm",
+  serviceId: "cloudhsm",
 };
diff --git a/clients/client-cloudsearch-domain/CloudSearchDomainClient.ts b/clients/client-cloudsearch-domain/CloudSearchDomainClient.ts
index 05a02dad5954e..9e9d7c088a941 100644
--- a/clients/client-cloudsearch-domain/CloudSearchDomainClient.ts
+++ b/clients/client-cloudsearch-domain/CloudSearchDomainClient.ts
@@ -118,9 +118,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cloudsearch-domain/runtimeConfig.shared.ts b/clients/client-cloudsearch-domain/runtimeConfig.shared.ts
index c0ffff279202e..29f40b2ab2046 100644
--- a/clients/client-cloudsearch-domain/runtimeConfig.shared.ts
+++ b/clients/client-cloudsearch-domain/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "cloudsearch",
+  serviceId: "cloudsearch",
 };
diff --git a/clients/client-cloudsearch/CloudSearchClient.ts b/clients/client-cloudsearch/CloudSearchClient.ts
index 6ea0053731734..88c84a97c80c0 100644
--- a/clients/client-cloudsearch/CloudSearchClient.ts
+++ b/clients/client-cloudsearch/CloudSearchClient.ts
@@ -232,9 +232,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cloudsearch/runtimeConfig.shared.ts b/clients/client-cloudsearch/runtimeConfig.shared.ts
index c0ffff279202e..29f40b2ab2046 100644
--- a/clients/client-cloudsearch/runtimeConfig.shared.ts
+++ b/clients/client-cloudsearch/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "cloudsearch",
+  serviceId: "cloudsearch",
 };
diff --git a/clients/client-cloudtrail/CloudTrailClient.ts b/clients/client-cloudtrail/CloudTrailClient.ts
index 11115d1799080..74471dbb097db 100644
--- a/clients/client-cloudtrail/CloudTrailClient.ts
+++ b/clients/client-cloudtrail/CloudTrailClient.ts
@@ -175,9 +175,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cloudtrail/runtimeConfig.shared.ts b/clients/client-cloudtrail/runtimeConfig.shared.ts
index 4ca3be9b26ef7..3259d32e9cbc8 100644
--- a/clients/client-cloudtrail/runtimeConfig.shared.ts
+++ b/clients/client-cloudtrail/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "cloudtrail",
+  serviceId: "cloudtrail",
 };
diff --git a/clients/client-cloudwatch-events/CloudWatchEventsClient.ts b/clients/client-cloudwatch-events/CloudWatchEventsClient.ts
index 134b93c5c1da0..aa8d15f8bd01b 100644
--- a/clients/client-cloudwatch-events/CloudWatchEventsClient.ts
+++ b/clients/client-cloudwatch-events/CloudWatchEventsClient.ts
@@ -265,9 +265,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cloudwatch-events/runtimeConfig.shared.ts b/clients/client-cloudwatch-events/runtimeConfig.shared.ts
index 763c06b2e68a4..a793a851b1af5 100644
--- a/clients/client-cloudwatch-events/runtimeConfig.shared.ts
+++ b/clients/client-cloudwatch-events/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "events",
+  serviceId: "events",
 };
diff --git a/clients/client-cloudwatch-logs/CloudWatchLogsClient.ts b/clients/client-cloudwatch-logs/CloudWatchLogsClient.ts
index ff83dcdb1d987..8cb692001c793 100644
--- a/clients/client-cloudwatch-logs/CloudWatchLogsClient.ts
+++ b/clients/client-cloudwatch-logs/CloudWatchLogsClient.ts
@@ -277,9 +277,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cloudwatch-logs/runtimeConfig.shared.ts b/clients/client-cloudwatch-logs/runtimeConfig.shared.ts
index eaa29ec424c58..49c03c8058c6b 100644
--- a/clients/client-cloudwatch-logs/runtimeConfig.shared.ts
+++ b/clients/client-cloudwatch-logs/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "logs",
+  serviceId: "logs",
 };
diff --git a/clients/client-cloudwatch/CloudWatchClient.ts b/clients/client-cloudwatch/CloudWatchClient.ts
index 3d621af246473..9efb0d5cdb4e6 100644
--- a/clients/client-cloudwatch/CloudWatchClient.ts
+++ b/clients/client-cloudwatch/CloudWatchClient.ts
@@ -238,9 +238,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cloudwatch/runtimeConfig.shared.ts b/clients/client-cloudwatch/runtimeConfig.shared.ts
index 47db23e14f31e..5dda3c1698b76 100644
--- a/clients/client-cloudwatch/runtimeConfig.shared.ts
+++ b/clients/client-cloudwatch/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "monitoring",
+  serviceId: "monitoring",
 };
diff --git a/clients/client-codeartifact/CodeartifactClient.ts b/clients/client-codeartifact/CodeartifactClient.ts
index 124827f693b60..89d31446c6378 100644
--- a/clients/client-codeartifact/CodeartifactClient.ts
+++ b/clients/client-codeartifact/CodeartifactClient.ts
@@ -283,9 +283,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-codeartifact/runtimeConfig.shared.ts b/clients/client-codeartifact/runtimeConfig.shared.ts
index 9d31566564362..37bccc08033c0 100644
--- a/clients/client-codeartifact/runtimeConfig.shared.ts
+++ b/clients/client-codeartifact/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "codeartifact",
+  serviceId: "codeartifact",
 };
diff --git a/clients/client-codebuild/CodeBuildClient.ts b/clients/client-codebuild/CodeBuildClient.ts
index 6dec21c93f22b..302c54f9eaf96 100644
--- a/clients/client-codebuild/CodeBuildClient.ts
+++ b/clients/client-codebuild/CodeBuildClient.ts
@@ -289,9 +289,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-codebuild/runtimeConfig.shared.ts b/clients/client-codebuild/runtimeConfig.shared.ts
index e5bb366b40566..9d8cc9e12048b 100644
--- a/clients/client-codebuild/runtimeConfig.shared.ts
+++ b/clients/client-codebuild/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "codebuild",
+  serviceId: "codebuild",
 };
diff --git a/clients/client-codecommit/CodeCommitClient.ts b/clients/client-codecommit/CodeCommitClient.ts
index d2931b252efce..61a7e9b7cc8bf 100644
--- a/clients/client-codecommit/CodeCommitClient.ts
+++ b/clients/client-codecommit/CodeCommitClient.ts
@@ -490,9 +490,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-codecommit/runtimeConfig.shared.ts b/clients/client-codecommit/runtimeConfig.shared.ts
index 2ba0fc8acb31d..45c0a8af5599f 100644
--- a/clients/client-codecommit/runtimeConfig.shared.ts
+++ b/clients/client-codecommit/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "codecommit",
+  serviceId: "codecommit",
 };
diff --git a/clients/client-codedeploy/CodeDeployClient.ts b/clients/client-codedeploy/CodeDeployClient.ts
index 30ea79c07e752..f5545b49a38a8 100644
--- a/clients/client-codedeploy/CodeDeployClient.ts
+++ b/clients/client-codedeploy/CodeDeployClient.ts
@@ -358,9 +358,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-codedeploy/runtimeConfig.shared.ts b/clients/client-codedeploy/runtimeConfig.shared.ts
index bcbb8fb51b7b7..17137abf264e0 100644
--- a/clients/client-codedeploy/runtimeConfig.shared.ts
+++ b/clients/client-codedeploy/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "codedeploy",
+  serviceId: "codedeploy",
 };
diff --git a/clients/client-codeguru-reviewer/CodeGuruReviewerClient.ts b/clients/client-codeguru-reviewer/CodeGuruReviewerClient.ts
index c47c47f496409..8366c6377a22d 100644
--- a/clients/client-codeguru-reviewer/CodeGuruReviewerClient.ts
+++ b/clients/client-codeguru-reviewer/CodeGuruReviewerClient.ts
@@ -184,9 +184,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-codeguru-reviewer/runtimeConfig.shared.ts b/clients/client-codeguru-reviewer/runtimeConfig.shared.ts
index f9d76a2054e59..aa2b84b9a6356 100644
--- a/clients/client-codeguru-reviewer/runtimeConfig.shared.ts
+++ b/clients/client-codeguru-reviewer/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "codeguru-reviewer",
+  serviceId: "codeguru-reviewer",
 };
diff --git a/clients/client-codeguruprofiler/CodeGuruProfilerClient.ts b/clients/client-codeguruprofiler/CodeGuruProfilerClient.ts
index e0149d46892c6..351ab3250787f 100644
--- a/clients/client-codeguruprofiler/CodeGuruProfilerClient.ts
+++ b/clients/client-codeguruprofiler/CodeGuruProfilerClient.ts
@@ -169,9 +169,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-codeguruprofiler/runtimeConfig.shared.ts b/clients/client-codeguruprofiler/runtimeConfig.shared.ts
index 60b70977633c1..2843a38b18b33 100644
--- a/clients/client-codeguruprofiler/runtimeConfig.shared.ts
+++ b/clients/client-codeguruprofiler/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "codeguru-profiler",
+  serviceId: "codeguru-profiler",
 };
diff --git a/clients/client-codepipeline/CodePipelineClient.ts b/clients/client-codepipeline/CodePipelineClient.ts
index e1b2478b31942..0cf50dd2a33b1 100644
--- a/clients/client-codepipeline/CodePipelineClient.ts
+++ b/clients/client-codepipeline/CodePipelineClient.ts
@@ -286,9 +286,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-codepipeline/runtimeConfig.shared.ts b/clients/client-codepipeline/runtimeConfig.shared.ts
index 8dbb748965f11..f4f8359106a85 100644
--- a/clients/client-codepipeline/runtimeConfig.shared.ts
+++ b/clients/client-codepipeline/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "codepipeline",
+  serviceId: "codepipeline",
 };
diff --git a/clients/client-codestar-connections/CodeStarConnectionsClient.ts b/clients/client-codestar-connections/CodeStarConnectionsClient.ts
index c438ecc40f9d8..e360103dcdec7 100644
--- a/clients/client-codestar-connections/CodeStarConnectionsClient.ts
+++ b/clients/client-codestar-connections/CodeStarConnectionsClient.ts
@@ -154,9 +154,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-codestar-connections/runtimeConfig.shared.ts b/clients/client-codestar-connections/runtimeConfig.shared.ts
index a18ff12855d8b..c58938f2e1a19 100644
--- a/clients/client-codestar-connections/runtimeConfig.shared.ts
+++ b/clients/client-codestar-connections/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "codestar-connections",
+  serviceId: "codestar-connections",
 };
diff --git a/clients/client-codestar-notifications/CodestarNotificationsClient.ts b/clients/client-codestar-notifications/CodestarNotificationsClient.ts
index ca941f96f6d23..ba87ec77f112a 100644
--- a/clients/client-codestar-notifications/CodestarNotificationsClient.ts
+++ b/clients/client-codestar-notifications/CodestarNotificationsClient.ts
@@ -172,9 +172,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-codestar-notifications/runtimeConfig.shared.ts b/clients/client-codestar-notifications/runtimeConfig.shared.ts
index 8893915b6a480..b308476a5629b 100644
--- a/clients/client-codestar-notifications/runtimeConfig.shared.ts
+++ b/clients/client-codestar-notifications/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "codestar-notifications",
+  serviceId: "codestar-notifications",
 };
diff --git a/clients/client-codestar/CodeStarClient.ts b/clients/client-codestar/CodeStarClient.ts
index fa5a6cc1e2d60..5d8aa9246b255 100644
--- a/clients/client-codestar/CodeStarClient.ts
+++ b/clients/client-codestar/CodeStarClient.ts
@@ -178,9 +178,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-codestar/runtimeConfig.shared.ts b/clients/client-codestar/runtimeConfig.shared.ts
index ae5ec6b24f0ce..d9927461271a1 100644
--- a/clients/client-codestar/runtimeConfig.shared.ts
+++ b/clients/client-codestar/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "codestar",
+  serviceId: "codestar",
 };
diff --git a/clients/client-cognito-identity-provider/CognitoIdentityProviderClient.ts b/clients/client-cognito-identity-provider/CognitoIdentityProviderClient.ts
index f6e3230da1661..efd4ac3c9df79 100644
--- a/clients/client-cognito-identity-provider/CognitoIdentityProviderClient.ts
+++ b/clients/client-cognito-identity-provider/CognitoIdentityProviderClient.ts
@@ -578,9 +578,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cognito-identity-provider/runtimeConfig.shared.ts b/clients/client-cognito-identity-provider/runtimeConfig.shared.ts
index b601d05dc4575..e3c877edda3d0 100644
--- a/clients/client-cognito-identity-provider/runtimeConfig.shared.ts
+++ b/clients/client-cognito-identity-provider/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "cognito-idp",
+  serviceId: "cognito-idp",
 };
diff --git a/clients/client-cognito-identity/CognitoIdentityClient.ts b/clients/client-cognito-identity/CognitoIdentityClient.ts
index 034043a8779c0..7d35ee6a04ce4 100644
--- a/clients/client-cognito-identity/CognitoIdentityClient.ts
+++ b/clients/client-cognito-identity/CognitoIdentityClient.ts
@@ -200,9 +200,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cognito-identity/runtimeConfig.shared.ts b/clients/client-cognito-identity/runtimeConfig.shared.ts
index 4917347af1398..3e0be882424c1 100644
--- a/clients/client-cognito-identity/runtimeConfig.shared.ts
+++ b/clients/client-cognito-identity/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "cognito-identity",
+  serviceId: "cognito-identity",
 };
diff --git a/clients/client-cognito-sync/CognitoSyncClient.ts b/clients/client-cognito-sync/CognitoSyncClient.ts
index deb851daf7ccd..8e6817f04555b 100644
--- a/clients/client-cognito-sync/CognitoSyncClient.ts
+++ b/clients/client-cognito-sync/CognitoSyncClient.ts
@@ -187,9 +187,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cognito-sync/runtimeConfig.shared.ts b/clients/client-cognito-sync/runtimeConfig.shared.ts
index 2a3dbf3c9ec7c..1b4d8da52462f 100644
--- a/clients/client-cognito-sync/runtimeConfig.shared.ts
+++ b/clients/client-cognito-sync/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "cognito-sync",
+  serviceId: "cognito-sync",
 };
diff --git a/clients/client-comprehend/ComprehendClient.ts b/clients/client-comprehend/ComprehendClient.ts
index 6ce8ada5395b5..908fb280a975c 100644
--- a/clients/client-comprehend/ComprehendClient.ts
+++ b/clients/client-comprehend/ComprehendClient.ts
@@ -433,9 +433,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-comprehend/runtimeConfig.shared.ts b/clients/client-comprehend/runtimeConfig.shared.ts
index c7eceb49c48fc..99804795b216b 100644
--- a/clients/client-comprehend/runtimeConfig.shared.ts
+++ b/clients/client-comprehend/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "comprehend",
+  serviceId: "comprehend",
 };
diff --git a/clients/client-comprehendmedical/ComprehendMedicalClient.ts b/clients/client-comprehendmedical/ComprehendMedicalClient.ts
index bbdaaf156d28b..26901c7756e33 100644
--- a/clients/client-comprehendmedical/ComprehendMedicalClient.ts
+++ b/clients/client-comprehendmedical/ComprehendMedicalClient.ts
@@ -226,9 +226,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-comprehendmedical/runtimeConfig.shared.ts b/clients/client-comprehendmedical/runtimeConfig.shared.ts
index 0e019fff83d0d..eabaf64ff2325 100644
--- a/clients/client-comprehendmedical/runtimeConfig.shared.ts
+++ b/clients/client-comprehendmedical/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "comprehendmedical",
+  serviceId: "comprehendmedical",
 };
diff --git a/clients/client-compute-optimizer/ComputeOptimizerClient.ts b/clients/client-compute-optimizer/ComputeOptimizerClient.ts
index 137aadcf4e66d..cb5135c63890c 100644
--- a/clients/client-compute-optimizer/ComputeOptimizerClient.ts
+++ b/clients/client-compute-optimizer/ComputeOptimizerClient.ts
@@ -175,9 +175,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-compute-optimizer/runtimeConfig.shared.ts b/clients/client-compute-optimizer/runtimeConfig.shared.ts
index 86eff162f5466..1f5cc0fe39802 100644
--- a/clients/client-compute-optimizer/runtimeConfig.shared.ts
+++ b/clients/client-compute-optimizer/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "compute-optimizer",
+  serviceId: "compute-optimizer",
 };
diff --git a/clients/client-config-service/ConfigServiceClient.ts b/clients/client-config-service/ConfigServiceClient.ts
index 01ccd9b504aff..67d1dc807665f 100644
--- a/clients/client-config-service/ConfigServiceClient.ts
+++ b/clients/client-config-service/ConfigServiceClient.ts
@@ -565,9 +565,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-config-service/runtimeConfig.shared.ts b/clients/client-config-service/runtimeConfig.shared.ts
index a4214b2884dc0..4a5d44656fb46 100644
--- a/clients/client-config-service/runtimeConfig.shared.ts
+++ b/clients/client-config-service/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "config",
+  serviceId: "config",
 };
diff --git a/clients/client-connect-contact-lens/ConnectContactLensClient.ts b/clients/client-connect-contact-lens/ConnectContactLensClient.ts
index 0254a045beddd..d76e7ffca9734 100644
--- a/clients/client-connect-contact-lens/ConnectContactLensClient.ts
+++ b/clients/client-connect-contact-lens/ConnectContactLensClient.ts
@@ -119,9 +119,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-connect-contact-lens/runtimeConfig.shared.ts b/clients/client-connect-contact-lens/runtimeConfig.shared.ts
index 98bf3ed1c4a86..900a844eb7151 100644
--- a/clients/client-connect-contact-lens/runtimeConfig.shared.ts
+++ b/clients/client-connect-contact-lens/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "connect",
+  serviceId: "connect",
 };
diff --git a/clients/client-connect/ConnectClient.ts b/clients/client-connect/ConnectClient.ts
index 5c8ea77da4eb8..f70ea34c4e41e 100644
--- a/clients/client-connect/ConnectClient.ts
+++ b/clients/client-connect/ConnectClient.ts
@@ -526,9 +526,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-connect/runtimeConfig.shared.ts b/clients/client-connect/runtimeConfig.shared.ts
index ced69eb979c7b..e0b99fe2f4a38 100644
--- a/clients/client-connect/runtimeConfig.shared.ts
+++ b/clients/client-connect/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "connect",
+  serviceId: "connect",
 };
diff --git a/clients/client-connectparticipant/ConnectParticipantClient.ts b/clients/client-connectparticipant/ConnectParticipantClient.ts
index 824390974c106..ebc7f2c064897 100644
--- a/clients/client-connectparticipant/ConnectParticipantClient.ts
+++ b/clients/client-connectparticipant/ConnectParticipantClient.ts
@@ -136,9 +136,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-connectparticipant/runtimeConfig.shared.ts b/clients/client-connectparticipant/runtimeConfig.shared.ts
index e0499b826959a..6b2605c0fd0aa 100644
--- a/clients/client-connectparticipant/runtimeConfig.shared.ts
+++ b/clients/client-connectparticipant/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "connect",
+  serviceId: "connect",
 };
diff --git a/clients/client-cost-and-usage-report-service/CostAndUsageReportServiceClient.ts b/clients/client-cost-and-usage-report-service/CostAndUsageReportServiceClient.ts
index 2fba8848a4bca..21eff09eba3c5 100644
--- a/clients/client-cost-and-usage-report-service/CostAndUsageReportServiceClient.ts
+++ b/clients/client-cost-and-usage-report-service/CostAndUsageReportServiceClient.ts
@@ -139,9 +139,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cost-and-usage-report-service/runtimeConfig.shared.ts b/clients/client-cost-and-usage-report-service/runtimeConfig.shared.ts
index 317d48ead6f9a..8de6d272b511c 100644
--- a/clients/client-cost-and-usage-report-service/runtimeConfig.shared.ts
+++ b/clients/client-cost-and-usage-report-service/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "cur",
+  serviceId: "cur",
 };
diff --git a/clients/client-cost-explorer/CostExplorerClient.ts b/clients/client-cost-explorer/CostExplorerClient.ts
index 326a8e8bcb64e..1c931237d28ac 100644
--- a/clients/client-cost-explorer/CostExplorerClient.ts
+++ b/clients/client-cost-explorer/CostExplorerClient.ts
@@ -268,9 +268,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-cost-explorer/runtimeConfig.shared.ts b/clients/client-cost-explorer/runtimeConfig.shared.ts
index da10d1fcb0f32..db54ab9b29327 100644
--- a/clients/client-cost-explorer/runtimeConfig.shared.ts
+++ b/clients/client-cost-explorer/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ce",
+  serviceId: "ce",
 };
diff --git a/clients/client-customer-profiles/CustomerProfilesClient.ts b/clients/client-customer-profiles/CustomerProfilesClient.ts
index 625dcad9ba46f..e1b5ac4573c5e 100644
--- a/clients/client-customer-profiles/CustomerProfilesClient.ts
+++ b/clients/client-customer-profiles/CustomerProfilesClient.ts
@@ -226,9 +226,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-customer-profiles/runtimeConfig.shared.ts b/clients/client-customer-profiles/runtimeConfig.shared.ts
index 368af68b56013..110a0601b4201 100644
--- a/clients/client-customer-profiles/runtimeConfig.shared.ts
+++ b/clients/client-customer-profiles/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "profile",
+  serviceId: "profile",
 };
diff --git a/clients/client-data-pipeline/DataPipelineClient.ts b/clients/client-data-pipeline/DataPipelineClient.ts
index 91bfab7db0205..bfebb99163f9f 100644
--- a/clients/client-data-pipeline/DataPipelineClient.ts
+++ b/clients/client-data-pipeline/DataPipelineClient.ts
@@ -184,9 +184,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-data-pipeline/runtimeConfig.shared.ts b/clients/client-data-pipeline/runtimeConfig.shared.ts
index 5d615499d402a..69f19c4b32a6f 100644
--- a/clients/client-data-pipeline/runtimeConfig.shared.ts
+++ b/clients/client-data-pipeline/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "datapipeline",
+  serviceId: "datapipeline",
 };
diff --git a/clients/client-database-migration-service/DatabaseMigrationServiceClient.ts b/clients/client-database-migration-service/DatabaseMigrationServiceClient.ts
index 7ac426f321d2f..a4453abdbd7fa 100644
--- a/clients/client-database-migration-service/DatabaseMigrationServiceClient.ts
+++ b/clients/client-database-migration-service/DatabaseMigrationServiceClient.ts
@@ -400,9 +400,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-database-migration-service/runtimeConfig.shared.ts b/clients/client-database-migration-service/runtimeConfig.shared.ts
index a4cf549ff91aa..cde11aed27297 100644
--- a/clients/client-database-migration-service/runtimeConfig.shared.ts
+++ b/clients/client-database-migration-service/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "dms",
+  serviceId: "dms",
 };
diff --git a/clients/client-databrew/DataBrewClient.ts b/clients/client-databrew/DataBrewClient.ts
index cdfa619449af8..3e76f942ef8d2 100644
--- a/clients/client-databrew/DataBrewClient.ts
+++ b/clients/client-databrew/DataBrewClient.ts
@@ -244,9 +244,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-databrew/runtimeConfig.shared.ts b/clients/client-databrew/runtimeConfig.shared.ts
index a163c9e32b225..466e8cd346f7d 100644
--- a/clients/client-databrew/runtimeConfig.shared.ts
+++ b/clients/client-databrew/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "databrew",
+  serviceId: "databrew",
 };
diff --git a/clients/client-dataexchange/DataExchangeClient.ts b/clients/client-dataexchange/DataExchangeClient.ts
index d547e55f9a6f5..fc3025afd62d0 100644
--- a/clients/client-dataexchange/DataExchangeClient.ts
+++ b/clients/client-dataexchange/DataExchangeClient.ts
@@ -187,9 +187,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-dataexchange/runtimeConfig.shared.ts b/clients/client-dataexchange/runtimeConfig.shared.ts
index 43405f2bfcfc9..27c741fc83c17 100644
--- a/clients/client-dataexchange/runtimeConfig.shared.ts
+++ b/clients/client-dataexchange/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "dataexchange",
+  serviceId: "dataexchange",
 };
diff --git a/clients/client-datasync/DataSyncClient.ts b/clients/client-datasync/DataSyncClient.ts
index a22ec135fffa0..a530ee21ed51d 100644
--- a/clients/client-datasync/DataSyncClient.ts
+++ b/clients/client-datasync/DataSyncClient.ts
@@ -244,9 +244,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-datasync/runtimeConfig.shared.ts b/clients/client-datasync/runtimeConfig.shared.ts
index 0dc85640e30e3..151192f0122ad 100644
--- a/clients/client-datasync/runtimeConfig.shared.ts
+++ b/clients/client-datasync/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "datasync",
+  serviceId: "datasync",
 };
diff --git a/clients/client-dax/DAXClient.ts b/clients/client-dax/DAXClient.ts
index 69c29aac9f71f..8e504006f327b 100644
--- a/clients/client-dax/DAXClient.ts
+++ b/clients/client-dax/DAXClient.ts
@@ -202,9 +202,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-dax/runtimeConfig.shared.ts b/clients/client-dax/runtimeConfig.shared.ts
index 551e309423971..14cb7e90f419f 100644
--- a/clients/client-dax/runtimeConfig.shared.ts
+++ b/clients/client-dax/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "dax",
+  serviceId: "dax",
 };
diff --git a/clients/client-detective/DetectiveClient.ts b/clients/client-detective/DetectiveClient.ts
index 6834e489de326..910ce0013b54d 100644
--- a/clients/client-detective/DetectiveClient.ts
+++ b/clients/client-detective/DetectiveClient.ts
@@ -157,9 +157,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-detective/runtimeConfig.shared.ts b/clients/client-detective/runtimeConfig.shared.ts
index 057b4e63267c0..9c82468562f7d 100644
--- a/clients/client-detective/runtimeConfig.shared.ts
+++ b/clients/client-detective/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "detective",
+  serviceId: "detective",
 };
diff --git a/clients/client-device-farm/DeviceFarmClient.ts b/clients/client-device-farm/DeviceFarmClient.ts
index 694990c958475..9a545020b5def 100644
--- a/clients/client-device-farm/DeviceFarmClient.ts
+++ b/clients/client-device-farm/DeviceFarmClient.ts
@@ -442,9 +442,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-device-farm/runtimeConfig.shared.ts b/clients/client-device-farm/runtimeConfig.shared.ts
index b60123041deb7..4685874efa1ca 100644
--- a/clients/client-device-farm/runtimeConfig.shared.ts
+++ b/clients/client-device-farm/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "devicefarm",
+  serviceId: "devicefarm",
 };
diff --git a/clients/client-devops-guru/DevOpsGuruClient.ts b/clients/client-devops-guru/DevOpsGuruClient.ts
index 176dfaff77e70..585bddb11e166 100644
--- a/clients/client-devops-guru/DevOpsGuruClient.ts
+++ b/clients/client-devops-guru/DevOpsGuruClient.ts
@@ -205,9 +205,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-devops-guru/runtimeConfig.shared.ts b/clients/client-devops-guru/runtimeConfig.shared.ts
index 99d656b13a437..61036ac6bc124 100644
--- a/clients/client-devops-guru/runtimeConfig.shared.ts
+++ b/clients/client-devops-guru/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "devops-guru",
+  serviceId: "devops-guru",
 };
diff --git a/clients/client-direct-connect/DirectConnectClient.ts b/clients/client-direct-connect/DirectConnectClient.ts
index 5f82118f5cdbb..0bcf7630eb013 100644
--- a/clients/client-direct-connect/DirectConnectClient.ts
+++ b/clients/client-direct-connect/DirectConnectClient.ts
@@ -403,9 +403,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-direct-connect/runtimeConfig.shared.ts b/clients/client-direct-connect/runtimeConfig.shared.ts
index 7b1debe3c52be..78d443a14d263 100644
--- a/clients/client-direct-connect/runtimeConfig.shared.ts
+++ b/clients/client-direct-connect/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "directconnect",
+  serviceId: "directconnect",
 };
diff --git a/clients/client-directory-service/DirectoryServiceClient.ts b/clients/client-directory-service/DirectoryServiceClient.ts
index d8e2011364188..c887f97f61762 100644
--- a/clients/client-directory-service/DirectoryServiceClient.ts
+++ b/clients/client-directory-service/DirectoryServiceClient.ts
@@ -382,9 +382,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-directory-service/runtimeConfig.shared.ts b/clients/client-directory-service/runtimeConfig.shared.ts
index 397d3a4ae629c..f5a0a7c475a52 100644
--- a/clients/client-directory-service/runtimeConfig.shared.ts
+++ b/clients/client-directory-service/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ds",
+  serviceId: "ds",
 };
diff --git a/clients/client-dlm/DLMClient.ts b/clients/client-dlm/DLMClient.ts
index 877afbf56036c..3f20d0e67b72b 100644
--- a/clients/client-dlm/DLMClient.ts
+++ b/clients/client-dlm/DLMClient.ts
@@ -154,9 +154,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-dlm/runtimeConfig.shared.ts b/clients/client-dlm/runtimeConfig.shared.ts
index 3034eb6843824..32380f5bc0eb4 100644
--- a/clients/client-dlm/runtimeConfig.shared.ts
+++ b/clients/client-dlm/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "dlm",
+  serviceId: "dlm",
 };
diff --git a/clients/client-docdb/DocDBClient.ts b/clients/client-docdb/DocDBClient.ts
index bd6422c06ecde..29f6d45157235 100644
--- a/clients/client-docdb/DocDBClient.ts
+++ b/clients/client-docdb/DocDBClient.ts
@@ -328,9 +328,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-docdb/runtimeConfig.shared.ts b/clients/client-docdb/runtimeConfig.shared.ts
index 7331c29e5ee1a..b974a689edac3 100644
--- a/clients/client-docdb/runtimeConfig.shared.ts
+++ b/clients/client-docdb/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "rds",
+  serviceId: "rds",
 };
diff --git a/clients/client-dynamodb-streams/DynamoDBStreamsClient.ts b/clients/client-dynamodb-streams/DynamoDBStreamsClient.ts
index a0f1de188b162..2763f483a0f19 100644
--- a/clients/client-dynamodb-streams/DynamoDBStreamsClient.ts
+++ b/clients/client-dynamodb-streams/DynamoDBStreamsClient.ts
@@ -127,9 +127,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-dynamodb-streams/runtimeConfig.shared.ts b/clients/client-dynamodb-streams/runtimeConfig.shared.ts
index 5621b7688c7f8..027100217e836 100644
--- a/clients/client-dynamodb-streams/runtimeConfig.shared.ts
+++ b/clients/client-dynamodb-streams/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "dynamodb",
+  serviceId: "dynamodb",
 };
diff --git a/clients/client-dynamodb/DynamoDBClient.ts b/clients/client-dynamodb/DynamoDBClient.ts
index 3d4cceb1b3e11..9aa68921402f7 100644
--- a/clients/client-dynamodb/DynamoDBClient.ts
+++ b/clients/client-dynamodb/DynamoDBClient.ts
@@ -316,9 +316,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-dynamodb/runtimeConfig.shared.ts b/clients/client-dynamodb/runtimeConfig.shared.ts
index 5621b7688c7f8..027100217e836 100644
--- a/clients/client-dynamodb/runtimeConfig.shared.ts
+++ b/clients/client-dynamodb/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "dynamodb",
+  serviceId: "dynamodb",
 };
diff --git a/clients/client-ebs/EBSClient.ts b/clients/client-ebs/EBSClient.ts
index f43152d628455..e76e91cb964c3 100644
--- a/clients/client-ebs/EBSClient.ts
+++ b/clients/client-ebs/EBSClient.ts
@@ -133,9 +133,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-ebs/runtimeConfig.shared.ts b/clients/client-ebs/runtimeConfig.shared.ts
index b440335379dbe..7524175b9487e 100644
--- a/clients/client-ebs/runtimeConfig.shared.ts
+++ b/clients/client-ebs/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ebs",
+  serviceId: "ebs",
 };
diff --git a/clients/client-ec2-instance-connect/EC2InstanceConnectClient.ts b/clients/client-ec2-instance-connect/EC2InstanceConnectClient.ts
index 6c4ad23367210..6d2832b833a15 100644
--- a/clients/client-ec2-instance-connect/EC2InstanceConnectClient.ts
+++ b/clients/client-ec2-instance-connect/EC2InstanceConnectClient.ts
@@ -116,9 +116,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-ec2-instance-connect/runtimeConfig.shared.ts b/clients/client-ec2-instance-connect/runtimeConfig.shared.ts
index d3ad6c1d51742..a366be93d5462 100644
--- a/clients/client-ec2-instance-connect/runtimeConfig.shared.ts
+++ b/clients/client-ec2-instance-connect/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ec2-instance-connect",
+  serviceId: "ec2-instance-connect",
 };
diff --git a/clients/client-ec2/EC2Client.ts b/clients/client-ec2/EC2Client.ts
index 4549df853cde0..d1d34cb49d8e3 100644
--- a/clients/client-ec2/EC2Client.ts
+++ b/clients/client-ec2/EC2Client.ts
@@ -2350,9 +2350,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-ec2/runtimeConfig.shared.ts b/clients/client-ec2/runtimeConfig.shared.ts
index 91def91d414ce..8449e3bf80034 100644
--- a/clients/client-ec2/runtimeConfig.shared.ts
+++ b/clients/client-ec2/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ec2",
+  serviceId: "ec2",
 };
diff --git a/clients/client-ecr-public/ECRPUBLICClient.ts b/clients/client-ecr-public/ECRPUBLICClient.ts
index f15c762e04fd1..48aa5564403f4 100644
--- a/clients/client-ecr-public/ECRPUBLICClient.ts
+++ b/clients/client-ecr-public/ECRPUBLICClient.ts
@@ -211,9 +211,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-ecr-public/runtimeConfig.shared.ts b/clients/client-ecr-public/runtimeConfig.shared.ts
index 2914e8d7d6799..cea9ff9f9b2c9 100644
--- a/clients/client-ecr-public/runtimeConfig.shared.ts
+++ b/clients/client-ecr-public/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ecr-public",
+  serviceId: "ecr-public",
 };
diff --git a/clients/client-ecr/ECRClient.ts b/clients/client-ecr/ECRClient.ts
index 0d6375c2407ae..600e6eefadf6e 100644
--- a/clients/client-ecr/ECRClient.ts
+++ b/clients/client-ecr/ECRClient.ts
@@ -271,9 +271,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-ecr/runtimeConfig.shared.ts b/clients/client-ecr/runtimeConfig.shared.ts
index 51dd5a3482c3b..8206d46e67df3 100644
--- a/clients/client-ecr/runtimeConfig.shared.ts
+++ b/clients/client-ecr/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ecr",
+  serviceId: "ecr",
 };
diff --git a/clients/client-ecs/ECSClient.ts b/clients/client-ecs/ECSClient.ts
index ebd58433e908b..400c917f0fb45 100644
--- a/clients/client-ecs/ECSClient.ts
+++ b/clients/client-ecs/ECSClient.ts
@@ -343,9 +343,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-ecs/runtimeConfig.shared.ts b/clients/client-ecs/runtimeConfig.shared.ts
index aff3eecc56a9c..0a97d58034c9b 100644
--- a/clients/client-ecs/runtimeConfig.shared.ts
+++ b/clients/client-ecs/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ecs",
+  serviceId: "ecs",
 };
diff --git a/clients/client-efs/EFSClient.ts b/clients/client-efs/EFSClient.ts
index 94d093fb5b0f8..0559eeac3e123 100644
--- a/clients/client-efs/EFSClient.ts
+++ b/clients/client-efs/EFSClient.ts
@@ -226,9 +226,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-efs/runtimeConfig.shared.ts b/clients/client-efs/runtimeConfig.shared.ts
index 86f159a39e1d2..28d26db437716 100644
--- a/clients/client-efs/runtimeConfig.shared.ts
+++ b/clients/client-efs/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "elasticfilesystem",
+  serviceId: "elasticfilesystem",
 };
diff --git a/clients/client-eks/EKSClient.ts b/clients/client-eks/EKSClient.ts
index 0c4eea09e26b4..22b8b403ddfa2 100644
--- a/clients/client-eks/EKSClient.ts
+++ b/clients/client-eks/EKSClient.ts
@@ -226,9 +226,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-eks/runtimeConfig.shared.ts b/clients/client-eks/runtimeConfig.shared.ts
index 98698fee82831..f21b7b570657e 100644
--- a/clients/client-eks/runtimeConfig.shared.ts
+++ b/clients/client-eks/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "eks",
+  serviceId: "eks",
 };
diff --git a/clients/client-elastic-beanstalk/ElasticBeanstalkClient.ts b/clients/client-elastic-beanstalk/ElasticBeanstalkClient.ts
index cb698debff5bd..5693c39f3bd6c 100644
--- a/clients/client-elastic-beanstalk/ElasticBeanstalkClient.ts
+++ b/clients/client-elastic-beanstalk/ElasticBeanstalkClient.ts
@@ -373,9 +373,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-elastic-beanstalk/runtimeConfig.shared.ts b/clients/client-elastic-beanstalk/runtimeConfig.shared.ts
index 1795359c5daa1..56e0b378047e9 100644
--- a/clients/client-elastic-beanstalk/runtimeConfig.shared.ts
+++ b/clients/client-elastic-beanstalk/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "elasticbeanstalk",
+  serviceId: "elasticbeanstalk",
 };
diff --git a/clients/client-elastic-inference/ElasticInferenceClient.ts b/clients/client-elastic-inference/ElasticInferenceClient.ts
index b9e3e375ebd6a..81cd7e208243a 100644
--- a/clients/client-elastic-inference/ElasticInferenceClient.ts
+++ b/clients/client-elastic-inference/ElasticInferenceClient.ts
@@ -145,9 +145,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-elastic-inference/runtimeConfig.shared.ts b/clients/client-elastic-inference/runtimeConfig.shared.ts
index 3b004358d8184..9d369f7594b99 100644
--- a/clients/client-elastic-inference/runtimeConfig.shared.ts
+++ b/clients/client-elastic-inference/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "elastic-inference",
+  serviceId: "elastic-inference",
 };
diff --git a/clients/client-elastic-load-balancing-v2/ElasticLoadBalancingV2Client.ts b/clients/client-elastic-load-balancing-v2/ElasticLoadBalancingV2Client.ts
index ba03e7f28f773..3df53c955dabf 100644
--- a/clients/client-elastic-load-balancing-v2/ElasticLoadBalancingV2Client.ts
+++ b/clients/client-elastic-load-balancing-v2/ElasticLoadBalancingV2Client.ts
@@ -253,9 +253,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-elastic-load-balancing-v2/runtimeConfig.shared.ts b/clients/client-elastic-load-balancing-v2/runtimeConfig.shared.ts
index ce2e8b36b3518..4c0875244bfc0 100644
--- a/clients/client-elastic-load-balancing-v2/runtimeConfig.shared.ts
+++ b/clients/client-elastic-load-balancing-v2/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "elasticloadbalancing",
+  serviceId: "elasticloadbalancing",
 };
diff --git a/clients/client-elastic-load-balancing/ElasticLoadBalancingClient.ts b/clients/client-elastic-load-balancing/ElasticLoadBalancingClient.ts
index cfccf13b5c4ee..b6be7c06db5ec 100644
--- a/clients/client-elastic-load-balancing/ElasticLoadBalancingClient.ts
+++ b/clients/client-elastic-load-balancing/ElasticLoadBalancingClient.ts
@@ -274,9 +274,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-elastic-load-balancing/runtimeConfig.shared.ts b/clients/client-elastic-load-balancing/runtimeConfig.shared.ts
index 2010bc612c7c7..a964b3f510a37 100644
--- a/clients/client-elastic-load-balancing/runtimeConfig.shared.ts
+++ b/clients/client-elastic-load-balancing/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "elasticloadbalancing",
+  serviceId: "elasticloadbalancing",
 };
diff --git a/clients/client-elastic-transcoder/ElasticTranscoderClient.ts b/clients/client-elastic-transcoder/ElasticTranscoderClient.ts
index fb398691eacff..f8066930c345c 100644
--- a/clients/client-elastic-transcoder/ElasticTranscoderClient.ts
+++ b/clients/client-elastic-transcoder/ElasticTranscoderClient.ts
@@ -172,9 +172,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-elastic-transcoder/runtimeConfig.shared.ts b/clients/client-elastic-transcoder/runtimeConfig.shared.ts
index 635d8037dd6a6..3f82bb4e1bc31 100644
--- a/clients/client-elastic-transcoder/runtimeConfig.shared.ts
+++ b/clients/client-elastic-transcoder/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "elastictranscoder",
+  serviceId: "elastictranscoder",
 };
diff --git a/clients/client-elasticache/ElastiCacheClient.ts b/clients/client-elasticache/ElastiCacheClient.ts
index e3bb52772b6a0..43530a2d25e33 100644
--- a/clients/client-elasticache/ElastiCacheClient.ts
+++ b/clients/client-elasticache/ElastiCacheClient.ts
@@ -442,9 +442,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-elasticache/runtimeConfig.shared.ts b/clients/client-elasticache/runtimeConfig.shared.ts
index 53379af31787f..10a78a41fc8cc 100644
--- a/clients/client-elasticache/runtimeConfig.shared.ts
+++ b/clients/client-elasticache/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "elasticache",
+  serviceId: "elasticache",
 };
diff --git a/clients/client-elasticsearch-service/ElasticsearchServiceClient.ts b/clients/client-elasticsearch-service/ElasticsearchServiceClient.ts
index 1ffd5e66ffc79..baadc5e34cde0 100644
--- a/clients/client-elasticsearch-service/ElasticsearchServiceClient.ts
+++ b/clients/client-elasticsearch-service/ElasticsearchServiceClient.ts
@@ -313,9 +313,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-elasticsearch-service/runtimeConfig.shared.ts b/clients/client-elasticsearch-service/runtimeConfig.shared.ts
index f7402b7cf0137..f2cf3b862ff70 100644
--- a/clients/client-elasticsearch-service/runtimeConfig.shared.ts
+++ b/clients/client-elasticsearch-service/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "es",
+  serviceId: "es",
 };
diff --git a/clients/client-emr-containers/EMRContainersClient.ts b/clients/client-emr-containers/EMRContainersClient.ts
index b532b5bcc6a9d..ddbead9ea10de 100644
--- a/clients/client-emr-containers/EMRContainersClient.ts
+++ b/clients/client-emr-containers/EMRContainersClient.ts
@@ -187,9 +187,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-emr-containers/runtimeConfig.shared.ts b/clients/client-emr-containers/runtimeConfig.shared.ts
index e0894da828d06..0e1e2f984e46f 100644
--- a/clients/client-emr-containers/runtimeConfig.shared.ts
+++ b/clients/client-emr-containers/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "emr-containers",
+  serviceId: "emr-containers",
 };
diff --git a/clients/client-emr/EMRClient.ts b/clients/client-emr/EMRClient.ts
index a392f6602373d..2e43d3ff4e38a 100644
--- a/clients/client-emr/EMRClient.ts
+++ b/clients/client-emr/EMRClient.ts
@@ -328,9 +328,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-emr/runtimeConfig.shared.ts b/clients/client-emr/runtimeConfig.shared.ts
index 2f96332b02bb6..2e638daa52038 100644
--- a/clients/client-emr/runtimeConfig.shared.ts
+++ b/clients/client-emr/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "elasticmapreduce",
+  serviceId: "elasticmapreduce",
 };
diff --git a/clients/client-eventbridge/EventBridgeClient.ts b/clients/client-eventbridge/EventBridgeClient.ts
index ec8c734f71c0b..699424f30b108 100644
--- a/clients/client-eventbridge/EventBridgeClient.ts
+++ b/clients/client-eventbridge/EventBridgeClient.ts
@@ -265,9 +265,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-eventbridge/runtimeConfig.shared.ts b/clients/client-eventbridge/runtimeConfig.shared.ts
index 763c06b2e68a4..a793a851b1af5 100644
--- a/clients/client-eventbridge/runtimeConfig.shared.ts
+++ b/clients/client-eventbridge/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "events",
+  serviceId: "events",
 };
diff --git a/clients/client-firehose/FirehoseClient.ts b/clients/client-firehose/FirehoseClient.ts
index 8b79caa5fdb51..6cbe7c6f6d1a5 100644
--- a/clients/client-firehose/FirehoseClient.ts
+++ b/clients/client-firehose/FirehoseClient.ts
@@ -175,9 +175,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-firehose/runtimeConfig.shared.ts b/clients/client-firehose/runtimeConfig.shared.ts
index 376f6aa06a61c..4aec159a98cc9 100644
--- a/clients/client-firehose/runtimeConfig.shared.ts
+++ b/clients/client-firehose/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "firehose",
+  serviceId: "firehose",
 };
diff --git a/clients/client-fms/FMSClient.ts b/clients/client-fms/FMSClient.ts
index 98188dd663748..83254b13b24a0 100644
--- a/clients/client-fms/FMSClient.ts
+++ b/clients/client-fms/FMSClient.ts
@@ -226,9 +226,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-fms/runtimeConfig.shared.ts b/clients/client-fms/runtimeConfig.shared.ts
index 2c044a4c501e8..71afd24f288e5 100644
--- a/clients/client-fms/runtimeConfig.shared.ts
+++ b/clients/client-fms/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "fms",
+  serviceId: "fms",
 };
diff --git a/clients/client-forecast/ForecastClient.ts b/clients/client-forecast/ForecastClient.ts
index fe395edd43ff1..421dda3d183df 100644
--- a/clients/client-forecast/ForecastClient.ts
+++ b/clients/client-forecast/ForecastClient.ts
@@ -256,9 +256,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-forecast/runtimeConfig.shared.ts b/clients/client-forecast/runtimeConfig.shared.ts
index b8df8e0765e72..9dd94e54d8006 100644
--- a/clients/client-forecast/runtimeConfig.shared.ts
+++ b/clients/client-forecast/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "forecast",
+  serviceId: "forecast",
 };
diff --git a/clients/client-forecastquery/ForecastqueryClient.ts b/clients/client-forecastquery/ForecastqueryClient.ts
index de7d475af31a6..38503bdb5c2ab 100644
--- a/clients/client-forecastquery/ForecastqueryClient.ts
+++ b/clients/client-forecastquery/ForecastqueryClient.ts
@@ -116,9 +116,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-forecastquery/runtimeConfig.shared.ts b/clients/client-forecastquery/runtimeConfig.shared.ts
index b8df8e0765e72..9dd94e54d8006 100644
--- a/clients/client-forecastquery/runtimeConfig.shared.ts
+++ b/clients/client-forecastquery/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "forecast",
+  serviceId: "forecast",
 };
diff --git a/clients/client-frauddetector/FraudDetectorClient.ts b/clients/client-frauddetector/FraudDetectorClient.ts
index b6827fde50d1a..4e3749f0e5bc7 100644
--- a/clients/client-frauddetector/FraudDetectorClient.ts
+++ b/clients/client-frauddetector/FraudDetectorClient.ts
@@ -310,9 +310,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-frauddetector/runtimeConfig.shared.ts b/clients/client-frauddetector/runtimeConfig.shared.ts
index 15622080ea94f..fd11413748933 100644
--- a/clients/client-frauddetector/runtimeConfig.shared.ts
+++ b/clients/client-frauddetector/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "frauddetector",
+  serviceId: "frauddetector",
 };
diff --git a/clients/client-fsx/FSxClient.ts b/clients/client-fsx/FSxClient.ts
index ccd886da47e46..e499b7221bc79 100644
--- a/clients/client-fsx/FSxClient.ts
+++ b/clients/client-fsx/FSxClient.ts
@@ -193,9 +193,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-fsx/runtimeConfig.shared.ts b/clients/client-fsx/runtimeConfig.shared.ts
index 7e83153543bff..c42fb96424eb6 100644
--- a/clients/client-fsx/runtimeConfig.shared.ts
+++ b/clients/client-fsx/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "fsx",
+  serviceId: "fsx",
 };
diff --git a/clients/client-gamelift/GameLiftClient.ts b/clients/client-gamelift/GameLiftClient.ts
index a23fd7a0d901e..dcc0f31d56f80 100644
--- a/clients/client-gamelift/GameLiftClient.ts
+++ b/clients/client-gamelift/GameLiftClient.ts
@@ -541,9 +541,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-gamelift/runtimeConfig.shared.ts b/clients/client-gamelift/runtimeConfig.shared.ts
index 39569afc2e9f5..e6920558a2459 100644
--- a/clients/client-gamelift/runtimeConfig.shared.ts
+++ b/clients/client-gamelift/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "gamelift",
+  serviceId: "gamelift",
 };
diff --git a/clients/client-glacier/GlacierClient.ts b/clients/client-glacier/GlacierClient.ts
index 6e6fddc9e78be..fadbc8211ed09 100644
--- a/clients/client-glacier/GlacierClient.ts
+++ b/clients/client-glacier/GlacierClient.ts
@@ -264,9 +264,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-glacier/runtimeConfig.shared.ts b/clients/client-glacier/runtimeConfig.shared.ts
index 7d22049c6bfea..af2d7dc52bb39 100644
--- a/clients/client-glacier/runtimeConfig.shared.ts
+++ b/clients/client-glacier/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "glacier",
+  serviceId: "glacier",
 };
diff --git a/clients/client-global-accelerator/GlobalAcceleratorClient.ts b/clients/client-global-accelerator/GlobalAcceleratorClient.ts
index 7cb4f9da355cb..8e82f5563942b 100644
--- a/clients/client-global-accelerator/GlobalAcceleratorClient.ts
+++ b/clients/client-global-accelerator/GlobalAcceleratorClient.ts
@@ -349,9 +349,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-global-accelerator/runtimeConfig.shared.ts b/clients/client-global-accelerator/runtimeConfig.shared.ts
index c811f05db0eb6..19cc235bc9ceb 100644
--- a/clients/client-global-accelerator/runtimeConfig.shared.ts
+++ b/clients/client-global-accelerator/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "globalaccelerator",
+  serviceId: "globalaccelerator",
 };
diff --git a/clients/client-glue/GlueClient.ts b/clients/client-glue/GlueClient.ts
index 8a8eb56b72c5e..aa999df654321 100644
--- a/clients/client-glue/GlueClient.ts
+++ b/clients/client-glue/GlueClient.ts
@@ -727,9 +727,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-glue/runtimeConfig.shared.ts b/clients/client-glue/runtimeConfig.shared.ts
index 82e851ea63434..be3053bcd785f 100644
--- a/clients/client-glue/runtimeConfig.shared.ts
+++ b/clients/client-glue/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "glue",
+  serviceId: "glue",
 };
diff --git a/clients/client-greengrass/GreengrassClient.ts b/clients/client-greengrass/GreengrassClient.ts
index ac324bca6e196..01e9243cd2a8e 100644
--- a/clients/client-greengrass/GreengrassClient.ts
+++ b/clients/client-greengrass/GreengrassClient.ts
@@ -619,9 +619,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-greengrass/runtimeConfig.shared.ts b/clients/client-greengrass/runtimeConfig.shared.ts
index 1ff85b0d8b4d0..d13ece5a58332 100644
--- a/clients/client-greengrass/runtimeConfig.shared.ts
+++ b/clients/client-greengrass/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "greengrass",
+  serviceId: "greengrass",
 };
diff --git a/clients/client-groundstation/GroundStationClient.ts b/clients/client-groundstation/GroundStationClient.ts
index 46374ec1c1db4..aa23e6be190be 100644
--- a/clients/client-groundstation/GroundStationClient.ts
+++ b/clients/client-groundstation/GroundStationClient.ts
@@ -217,9 +217,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-groundstation/runtimeConfig.shared.ts b/clients/client-groundstation/runtimeConfig.shared.ts
index bfc6b14a96581..46eb42fe8a644 100644
--- a/clients/client-groundstation/runtimeConfig.shared.ts
+++ b/clients/client-groundstation/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "groundstation",
+  serviceId: "groundstation",
 };
diff --git a/clients/client-guardduty/GuardDutyClient.ts b/clients/client-guardduty/GuardDutyClient.ts
index 9f10e9849b214..9ebea17d47ef7 100644
--- a/clients/client-guardduty/GuardDutyClient.ts
+++ b/clients/client-guardduty/GuardDutyClient.ts
@@ -361,9 +361,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-guardduty/runtimeConfig.shared.ts b/clients/client-guardduty/runtimeConfig.shared.ts
index 854298e6c8a82..3a5cc72bdfc41 100644
--- a/clients/client-guardduty/runtimeConfig.shared.ts
+++ b/clients/client-guardduty/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "guardduty",
+  serviceId: "guardduty",
 };
diff --git a/clients/client-health/HealthClient.ts b/clients/client-health/HealthClient.ts
index ddc8f6a6554ac..cf6ca6604c766 100644
--- a/clients/client-health/HealthClient.ts
+++ b/clients/client-health/HealthClient.ts
@@ -187,9 +187,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-health/runtimeConfig.shared.ts b/clients/client-health/runtimeConfig.shared.ts
index c7bbe880bd8fd..9a6a7a33ed0b2 100644
--- a/clients/client-health/runtimeConfig.shared.ts
+++ b/clients/client-health/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "health",
+  serviceId: "health",
 };
diff --git a/clients/client-healthlake/HealthLakeClient.ts b/clients/client-healthlake/HealthLakeClient.ts
index c00ef8e9ad079..36e8c7f57e9e6 100644
--- a/clients/client-healthlake/HealthLakeClient.ts
+++ b/clients/client-healthlake/HealthLakeClient.ts
@@ -145,9 +145,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-healthlake/runtimeConfig.shared.ts b/clients/client-healthlake/runtimeConfig.shared.ts
index 8a95177533fe6..0e92adbf849b9 100644
--- a/clients/client-healthlake/runtimeConfig.shared.ts
+++ b/clients/client-healthlake/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "healthlake",
+  serviceId: "healthlake",
 };
diff --git a/clients/client-honeycode/HoneycodeClient.ts b/clients/client-honeycode/HoneycodeClient.ts
index 950884a88ae4e..00ae63a57c3b8 100644
--- a/clients/client-honeycode/HoneycodeClient.ts
+++ b/clients/client-honeycode/HoneycodeClient.ts
@@ -172,9 +172,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-honeycode/runtimeConfig.shared.ts b/clients/client-honeycode/runtimeConfig.shared.ts
index afb8f12c1181c..dd36fed36f1c9 100644
--- a/clients/client-honeycode/runtimeConfig.shared.ts
+++ b/clients/client-honeycode/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "honeycode",
+  serviceId: "honeycode",
 };
diff --git a/clients/client-iam/IAMClient.ts b/clients/client-iam/IAMClient.ts
index d60ff54cf7bd8..1f4a9f712288f 100644
--- a/clients/client-iam/IAMClient.ts
+++ b/clients/client-iam/IAMClient.ts
@@ -733,9 +733,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-iam/runtimeConfig.shared.ts b/clients/client-iam/runtimeConfig.shared.ts
index 64e85dc139acb..abd2dc6c1b70e 100644
--- a/clients/client-iam/runtimeConfig.shared.ts
+++ b/clients/client-iam/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "iam",
+  serviceId: "iam",
 };
diff --git a/clients/client-identitystore/IdentitystoreClient.ts b/clients/client-identitystore/IdentitystoreClient.ts
index 00f678bfeb20b..665627767456b 100644
--- a/clients/client-identitystore/IdentitystoreClient.ts
+++ b/clients/client-identitystore/IdentitystoreClient.ts
@@ -127,9 +127,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-identitystore/runtimeConfig.shared.ts b/clients/client-identitystore/runtimeConfig.shared.ts
index 7291a5137dfd8..624f0fa427fce 100644
--- a/clients/client-identitystore/runtimeConfig.shared.ts
+++ b/clients/client-identitystore/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "identitystore",
+  serviceId: "identitystore",
 };
diff --git a/clients/client-imagebuilder/ImagebuilderClient.ts b/clients/client-imagebuilder/ImagebuilderClient.ts
index b55f618e4f23b..e919d6e3f7f0f 100644
--- a/clients/client-imagebuilder/ImagebuilderClient.ts
+++ b/clients/client-imagebuilder/ImagebuilderClient.ts
@@ -304,9 +304,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-imagebuilder/runtimeConfig.shared.ts b/clients/client-imagebuilder/runtimeConfig.shared.ts
index 547e5b1709e0c..703cc9363f3f0 100644
--- a/clients/client-imagebuilder/runtimeConfig.shared.ts
+++ b/clients/client-imagebuilder/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "imagebuilder",
+  serviceId: "imagebuilder",
 };
diff --git a/clients/client-inspector/InspectorClient.ts b/clients/client-inspector/InspectorClient.ts
index 99ddfa9546c4c..49331db397bf3 100644
--- a/clients/client-inspector/InspectorClient.ts
+++ b/clients/client-inspector/InspectorClient.ts
@@ -304,9 +304,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-inspector/runtimeConfig.shared.ts b/clients/client-inspector/runtimeConfig.shared.ts
index e735430eef544..440090ce10561 100644
--- a/clients/client-inspector/runtimeConfig.shared.ts
+++ b/clients/client-inspector/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "inspector",
+  serviceId: "inspector",
 };
diff --git a/clients/client-iot-1click-devices-service/IoT1ClickDevicesServiceClient.ts b/clients/client-iot-1click-devices-service/IoT1ClickDevicesServiceClient.ts
index f920cb80e63d7..2960f82f53864 100644
--- a/clients/client-iot-1click-devices-service/IoT1ClickDevicesServiceClient.ts
+++ b/clients/client-iot-1click-devices-service/IoT1ClickDevicesServiceClient.ts
@@ -166,9 +166,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-iot-1click-devices-service/runtimeConfig.shared.ts b/clients/client-iot-1click-devices-service/runtimeConfig.shared.ts
index b0026e2e76d09..350bd2d6b2a4a 100644
--- a/clients/client-iot-1click-devices-service/runtimeConfig.shared.ts
+++ b/clients/client-iot-1click-devices-service/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "iot1click",
+  serviceId: "iot1click",
 };
diff --git a/clients/client-iot-1click-projects/IoT1ClickProjectsClient.ts b/clients/client-iot-1click-projects/IoT1ClickProjectsClient.ts
index 58a6bb8579186..60cf49887d711 100644
--- a/clients/client-iot-1click-projects/IoT1ClickProjectsClient.ts
+++ b/clients/client-iot-1click-projects/IoT1ClickProjectsClient.ts
@@ -175,9 +175,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-iot-1click-projects/runtimeConfig.shared.ts b/clients/client-iot-1click-projects/runtimeConfig.shared.ts
index b0026e2e76d09..350bd2d6b2a4a 100644
--- a/clients/client-iot-1click-projects/runtimeConfig.shared.ts
+++ b/clients/client-iot-1click-projects/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "iot1click",
+  serviceId: "iot1click",
 };
diff --git a/clients/client-iot-data-plane/IoTDataPlaneClient.ts b/clients/client-iot-data-plane/IoTDataPlaneClient.ts
index 0b09c5f1953b0..7c4475f674cae 100644
--- a/clients/client-iot-data-plane/IoTDataPlaneClient.ts
+++ b/clients/client-iot-data-plane/IoTDataPlaneClient.ts
@@ -133,9 +133,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-iot-data-plane/runtimeConfig.shared.ts b/clients/client-iot-data-plane/runtimeConfig.shared.ts
index 4214e2d61dbdd..5f7ebe0b60eca 100644
--- a/clients/client-iot-data-plane/runtimeConfig.shared.ts
+++ b/clients/client-iot-data-plane/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "iotdata",
+  serviceId: "iotdata",
 };
diff --git a/clients/client-iot-events-data/IoTEventsDataClient.ts b/clients/client-iot-events-data/IoTEventsDataClient.ts
index 70f531f353a93..47b1dffda2e85 100644
--- a/clients/client-iot-events-data/IoTEventsDataClient.ts
+++ b/clients/client-iot-events-data/IoTEventsDataClient.ts
@@ -130,9 +130,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-iot-events-data/runtimeConfig.shared.ts b/clients/client-iot-events-data/runtimeConfig.shared.ts
index a1868ace9fef3..69a65fb250889 100644
--- a/clients/client-iot-events-data/runtimeConfig.shared.ts
+++ b/clients/client-iot-events-data/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ioteventsdata",
+  serviceId: "ioteventsdata",
 };
diff --git a/clients/client-iot-events/IoTEventsClient.ts b/clients/client-iot-events/IoTEventsClient.ts
index 4c43b17490a46..eca0d490de8a9 100644
--- a/clients/client-iot-events/IoTEventsClient.ts
+++ b/clients/client-iot-events/IoTEventsClient.ts
@@ -184,9 +184,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-iot-events/runtimeConfig.shared.ts b/clients/client-iot-events/runtimeConfig.shared.ts
index 11c587bc5bd54..4a03345c1fa4f 100644
--- a/clients/client-iot-events/runtimeConfig.shared.ts
+++ b/clients/client-iot-events/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "iotevents",
+  serviceId: "iotevents",
 };
diff --git a/clients/client-iot-jobs-data-plane/IoTJobsDataPlaneClient.ts b/clients/client-iot-jobs-data-plane/IoTJobsDataPlaneClient.ts
index 21fd853354fc4..b234757cda311 100644
--- a/clients/client-iot-jobs-data-plane/IoTJobsDataPlaneClient.ts
+++ b/clients/client-iot-jobs-data-plane/IoTJobsDataPlaneClient.ts
@@ -136,9 +136,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-iot-jobs-data-plane/runtimeConfig.shared.ts b/clients/client-iot-jobs-data-plane/runtimeConfig.shared.ts
index 313d0c5aa1304..4c0570a0e4d50 100644
--- a/clients/client-iot-jobs-data-plane/runtimeConfig.shared.ts
+++ b/clients/client-iot-jobs-data-plane/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "iot-jobs-data",
+  serviceId: "iot-jobs-data",
 };
diff --git a/clients/client-iot/IoTClient.ts b/clients/client-iot/IoTClient.ts
index e33d157b09f39..bc693d2c2aaec 100644
--- a/clients/client-iot/IoTClient.ts
+++ b/clients/client-iot/IoTClient.ts
@@ -1120,9 +1120,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-iot/runtimeConfig.shared.ts b/clients/client-iot/runtimeConfig.shared.ts
index 9fc1c6ec910fe..94d03416c74ad 100644
--- a/clients/client-iot/runtimeConfig.shared.ts
+++ b/clients/client-iot/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "iot",
+  serviceId: "iot",
 };
diff --git a/clients/client-iotanalytics/IoTAnalyticsClient.ts b/clients/client-iotanalytics/IoTAnalyticsClient.ts
index bd55ff37b2c64..8ae72a8de38f3 100644
--- a/clients/client-iotanalytics/IoTAnalyticsClient.ts
+++ b/clients/client-iotanalytics/IoTAnalyticsClient.ts
@@ -241,9 +241,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-iotanalytics/runtimeConfig.shared.ts b/clients/client-iotanalytics/runtimeConfig.shared.ts
index dcbd3098f619e..3c15e824daf85 100644
--- a/clients/client-iotanalytics/runtimeConfig.shared.ts
+++ b/clients/client-iotanalytics/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "iotanalytics",
+  serviceId: "iotanalytics",
 };
diff --git a/clients/client-iotsecuretunneling/IoTSecureTunnelingClient.ts b/clients/client-iotsecuretunneling/IoTSecureTunnelingClient.ts
index 3d44a30fa0035..598f6a650e4aa 100644
--- a/clients/client-iotsecuretunneling/IoTSecureTunnelingClient.ts
+++ b/clients/client-iotsecuretunneling/IoTSecureTunnelingClient.ts
@@ -139,9 +139,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-iotsecuretunneling/runtimeConfig.shared.ts b/clients/client-iotsecuretunneling/runtimeConfig.shared.ts
index 9585dcd10e808..ebd860d99a24e 100644
--- a/clients/client-iotsecuretunneling/runtimeConfig.shared.ts
+++ b/clients/client-iotsecuretunneling/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "iotsecuredtunneling",
+  serviceId: "iotsecuredtunneling",
 };
diff --git a/clients/client-iotsitewise/IoTSiteWiseClient.ts b/clients/client-iotsitewise/IoTSiteWiseClient.ts
index 45cc9033d3c5f..afae178457efe 100644
--- a/clients/client-iotsitewise/IoTSiteWiseClient.ts
+++ b/clients/client-iotsitewise/IoTSiteWiseClient.ts
@@ -337,9 +337,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-iotsitewise/runtimeConfig.shared.ts b/clients/client-iotsitewise/runtimeConfig.shared.ts
index 90b21df9d6d3d..60b41c5a9d454 100644
--- a/clients/client-iotsitewise/runtimeConfig.shared.ts
+++ b/clients/client-iotsitewise/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "iotsitewise",
+  serviceId: "iotsitewise",
 };
diff --git a/clients/client-iotthingsgraph/IoTThingsGraphClient.ts b/clients/client-iotthingsgraph/IoTThingsGraphClient.ts
index 6a1cd6f083201..03052b99ca83f 100644
--- a/clients/client-iotthingsgraph/IoTThingsGraphClient.ts
+++ b/clients/client-iotthingsgraph/IoTThingsGraphClient.ts
@@ -283,9 +283,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-iotthingsgraph/runtimeConfig.shared.ts b/clients/client-iotthingsgraph/runtimeConfig.shared.ts
index d3977c195a5fd..cd8bbd816df79 100644
--- a/clients/client-iotthingsgraph/runtimeConfig.shared.ts
+++ b/clients/client-iotthingsgraph/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "iotthingsgraph",
+  serviceId: "iotthingsgraph",
 };
diff --git a/clients/client-ivs/IvsClient.ts b/clients/client-ivs/IvsClient.ts
index 8dadaee4722dc..7e598fe25cb52 100644
--- a/clients/client-ivs/IvsClient.ts
+++ b/clients/client-ivs/IvsClient.ts
@@ -193,9 +193,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-ivs/runtimeConfig.shared.ts b/clients/client-ivs/runtimeConfig.shared.ts
index 42dc30640f4db..3bbdf279c8000 100644
--- a/clients/client-ivs/runtimeConfig.shared.ts
+++ b/clients/client-ivs/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ivs",
+  serviceId: "ivs",
 };
diff --git a/clients/client-kafka/KafkaClient.ts b/clients/client-kafka/KafkaClient.ts
index aa54fc28d928b..29b639e20a70d 100644
--- a/clients/client-kafka/KafkaClient.ts
+++ b/clients/client-kafka/KafkaClient.ts
@@ -250,9 +250,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-kafka/runtimeConfig.shared.ts b/clients/client-kafka/runtimeConfig.shared.ts
index 8876a58472a84..b3cf1823f7ae0 100644
--- a/clients/client-kafka/runtimeConfig.shared.ts
+++ b/clients/client-kafka/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "kafka",
+  serviceId: "kafka",
 };
diff --git a/clients/client-kendra/KendraClient.ts b/clients/client-kendra/KendraClient.ts
index bd9377b904054..058557db96fc4 100644
--- a/clients/client-kendra/KendraClient.ts
+++ b/clients/client-kendra/KendraClient.ts
@@ -202,9 +202,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-kendra/runtimeConfig.shared.ts b/clients/client-kendra/runtimeConfig.shared.ts
index 7dedd69213947..c05fa359a2ca9 100644
--- a/clients/client-kendra/runtimeConfig.shared.ts
+++ b/clients/client-kendra/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "kendra",
+  serviceId: "kendra",
 };
diff --git a/clients/client-kinesis-analytics-v2/KinesisAnalyticsV2Client.ts b/clients/client-kinesis-analytics-v2/KinesisAnalyticsV2Client.ts
index 35b26188d0c7f..0d02be0f19fce 100644
--- a/clients/client-kinesis-analytics-v2/KinesisAnalyticsV2Client.ts
+++ b/clients/client-kinesis-analytics-v2/KinesisAnalyticsV2Client.ts
@@ -253,9 +253,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-kinesis-analytics-v2/runtimeConfig.shared.ts b/clients/client-kinesis-analytics-v2/runtimeConfig.shared.ts
index 56fb549fa7aeb..740eef92f2aea 100644
--- a/clients/client-kinesis-analytics-v2/runtimeConfig.shared.ts
+++ b/clients/client-kinesis-analytics-v2/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "kinesisanalytics",
+  serviceId: "kinesisanalytics",
 };
diff --git a/clients/client-kinesis-analytics/KinesisAnalyticsClient.ts b/clients/client-kinesis-analytics/KinesisAnalyticsClient.ts
index db7ab0b9b0cd1..b111f393f2dc5 100644
--- a/clients/client-kinesis-analytics/KinesisAnalyticsClient.ts
+++ b/clients/client-kinesis-analytics/KinesisAnalyticsClient.ts
@@ -211,9 +211,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-kinesis-analytics/runtimeConfig.shared.ts b/clients/client-kinesis-analytics/runtimeConfig.shared.ts
index afeb32c1ca5af..5218487df6e8a 100644
--- a/clients/client-kinesis-analytics/runtimeConfig.shared.ts
+++ b/clients/client-kinesis-analytics/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "kinesisanalytics",
+  serviceId: "kinesisanalytics",
 };
diff --git a/clients/client-kinesis-video-archived-media/KinesisVideoArchivedMediaClient.ts b/clients/client-kinesis-video-archived-media/KinesisVideoArchivedMediaClient.ts
index ffa36d60f5b92..c07c02ff7fef0 100644
--- a/clients/client-kinesis-video-archived-media/KinesisVideoArchivedMediaClient.ts
+++ b/clients/client-kinesis-video-archived-media/KinesisVideoArchivedMediaClient.ts
@@ -139,9 +139,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-kinesis-video-archived-media/runtimeConfig.shared.ts b/clients/client-kinesis-video-archived-media/runtimeConfig.shared.ts
index eed5699ec9bee..e15928364ec4e 100644
--- a/clients/client-kinesis-video-archived-media/runtimeConfig.shared.ts
+++ b/clients/client-kinesis-video-archived-media/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "kinesisvideo",
+  serviceId: "kinesisvideo",
 };
diff --git a/clients/client-kinesis-video-media/KinesisVideoMediaClient.ts b/clients/client-kinesis-video-media/KinesisVideoMediaClient.ts
index b0d0e813608cc..5e37683b26082 100644
--- a/clients/client-kinesis-video-media/KinesisVideoMediaClient.ts
+++ b/clients/client-kinesis-video-media/KinesisVideoMediaClient.ts
@@ -116,9 +116,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-kinesis-video-media/runtimeConfig.shared.ts b/clients/client-kinesis-video-media/runtimeConfig.shared.ts
index eed5699ec9bee..e15928364ec4e 100644
--- a/clients/client-kinesis-video-media/runtimeConfig.shared.ts
+++ b/clients/client-kinesis-video-media/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "kinesisvideo",
+  serviceId: "kinesisvideo",
 };
diff --git a/clients/client-kinesis-video-signaling/KinesisVideoSignalingClient.ts b/clients/client-kinesis-video-signaling/KinesisVideoSignalingClient.ts
index e6be810371f92..4c73a9b7a3f78 100644
--- a/clients/client-kinesis-video-signaling/KinesisVideoSignalingClient.ts
+++ b/clients/client-kinesis-video-signaling/KinesisVideoSignalingClient.ts
@@ -120,9 +120,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-kinesis-video-signaling/runtimeConfig.shared.ts b/clients/client-kinesis-video-signaling/runtimeConfig.shared.ts
index 463ee380000a1..2f9e93d60b3b6 100644
--- a/clients/client-kinesis-video-signaling/runtimeConfig.shared.ts
+++ b/clients/client-kinesis-video-signaling/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "kinesisvideo",
+  serviceId: "kinesisvideo",
 };
diff --git a/clients/client-kinesis-video/KinesisVideoClient.ts b/clients/client-kinesis-video/KinesisVideoClient.ts
index fb44d30559d31..95abff7b57743 100644
--- a/clients/client-kinesis-video/KinesisVideoClient.ts
+++ b/clients/client-kinesis-video/KinesisVideoClient.ts
@@ -196,9 +196,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-kinesis-video/runtimeConfig.shared.ts b/clients/client-kinesis-video/runtimeConfig.shared.ts
index eed5699ec9bee..e15928364ec4e 100644
--- a/clients/client-kinesis-video/runtimeConfig.shared.ts
+++ b/clients/client-kinesis-video/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "kinesisvideo",
+  serviceId: "kinesisvideo",
 };
diff --git a/clients/client-kinesis/KinesisClient.ts b/clients/client-kinesis/KinesisClient.ts
index b6e45a95183e9..29fc04810df9b 100644
--- a/clients/client-kinesis/KinesisClient.ts
+++ b/clients/client-kinesis/KinesisClient.ts
@@ -241,9 +241,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-kinesis/runtimeConfig.shared.ts b/clients/client-kinesis/runtimeConfig.shared.ts
index ebf1dfb585e40..afcc72df9c4ac 100644
--- a/clients/client-kinesis/runtimeConfig.shared.ts
+++ b/clients/client-kinesis/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "kinesis",
+  serviceId: "kinesis",
 };
diff --git a/clients/client-kms/KMSClient.ts b/clients/client-kms/KMSClient.ts
index 009b9fd61ac3c..4b60eeb367381 100644
--- a/clients/client-kms/KMSClient.ts
+++ b/clients/client-kms/KMSClient.ts
@@ -298,9 +298,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-kms/runtimeConfig.shared.ts b/clients/client-kms/runtimeConfig.shared.ts
index f1381d95b43e7..e0daa190a718e 100644
--- a/clients/client-kms/runtimeConfig.shared.ts
+++ b/clients/client-kms/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "kms",
+  serviceId: "kms",
 };
diff --git a/clients/client-lakeformation/LakeFormationClient.ts b/clients/client-lakeformation/LakeFormationClient.ts
index c0e8326aae4ed..bbfb99b62bda2 100644
--- a/clients/client-lakeformation/LakeFormationClient.ts
+++ b/clients/client-lakeformation/LakeFormationClient.ts
@@ -169,9 +169,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-lakeformation/runtimeConfig.shared.ts b/clients/client-lakeformation/runtimeConfig.shared.ts
index 6fd4175bb2e22..dc81829412ed1 100644
--- a/clients/client-lakeformation/runtimeConfig.shared.ts
+++ b/clients/client-lakeformation/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "lakeformation",
+  serviceId: "lakeformation",
 };
diff --git a/clients/client-lambda/LambdaClient.ts b/clients/client-lambda/LambdaClient.ts
index f77a48c924207..fc4be790bc28a 100644
--- a/clients/client-lambda/LambdaClient.ts
+++ b/clients/client-lambda/LambdaClient.ts
@@ -391,9 +391,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-lambda/runtimeConfig.shared.ts b/clients/client-lambda/runtimeConfig.shared.ts
index 50b7af9b8a25d..372d29a0b5ac1 100644
--- a/clients/client-lambda/runtimeConfig.shared.ts
+++ b/clients/client-lambda/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "lambda",
+  serviceId: "lambda",
 };
diff --git a/clients/client-lex-model-building-service/LexModelBuildingServiceClient.ts b/clients/client-lex-model-building-service/LexModelBuildingServiceClient.ts
index c263f59202d3e..c9a278b45a5fa 100644
--- a/clients/client-lex-model-building-service/LexModelBuildingServiceClient.ts
+++ b/clients/client-lex-model-building-service/LexModelBuildingServiceClient.ts
@@ -262,9 +262,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-lex-model-building-service/runtimeConfig.shared.ts b/clients/client-lex-model-building-service/runtimeConfig.shared.ts
index 0ba9885620b53..0a9dd53120013 100644
--- a/clients/client-lex-model-building-service/runtimeConfig.shared.ts
+++ b/clients/client-lex-model-building-service/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "lex",
+  serviceId: "lex",
 };
diff --git a/clients/client-lex-runtime-service/LexRuntimeServiceClient.ts b/clients/client-lex-runtime-service/LexRuntimeServiceClient.ts
index dc748f9b91550..30c574f902e88 100644
--- a/clients/client-lex-runtime-service/LexRuntimeServiceClient.ts
+++ b/clients/client-lex-runtime-service/LexRuntimeServiceClient.ts
@@ -130,9 +130,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-lex-runtime-service/runtimeConfig.shared.ts b/clients/client-lex-runtime-service/runtimeConfig.shared.ts
index 5ad8fdbc5f3e4..063cf9b31452e 100644
--- a/clients/client-lex-runtime-service/runtimeConfig.shared.ts
+++ b/clients/client-lex-runtime-service/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "lex",
+  serviceId: "lex",
 };
diff --git a/clients/client-license-manager/LicenseManagerClient.ts b/clients/client-license-manager/LicenseManagerClient.ts
index 08a0dcbecb4ba..c189a024dcf17 100644
--- a/clients/client-license-manager/LicenseManagerClient.ts
+++ b/clients/client-license-manager/LicenseManagerClient.ts
@@ -292,9 +292,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-license-manager/runtimeConfig.shared.ts b/clients/client-license-manager/runtimeConfig.shared.ts
index 63c3efc22e235..a6096bed4b4e9 100644
--- a/clients/client-license-manager/runtimeConfig.shared.ts
+++ b/clients/client-license-manager/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "license-manager",
+  serviceId: "license-manager",
 };
diff --git a/clients/client-lightsail/LightsailClient.ts b/clients/client-lightsail/LightsailClient.ts
index f78cc0efa8d1d..69549b4294e09 100644
--- a/clients/client-lightsail/LightsailClient.ts
+++ b/clients/client-lightsail/LightsailClient.ts
@@ -748,9 +748,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-lightsail/runtimeConfig.shared.ts b/clients/client-lightsail/runtimeConfig.shared.ts
index ab08bacbdf313..96a128ce8f588 100644
--- a/clients/client-lightsail/runtimeConfig.shared.ts
+++ b/clients/client-lightsail/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "lightsail",
+  serviceId: "lightsail",
 };
diff --git a/clients/client-lookoutvision/LookoutVisionClient.ts b/clients/client-lookoutvision/LookoutVisionClient.ts
index bbcacd77addd9..f26001f1d0482 100644
--- a/clients/client-lookoutvision/LookoutVisionClient.ts
+++ b/clients/client-lookoutvision/LookoutVisionClient.ts
@@ -166,9 +166,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-lookoutvision/runtimeConfig.shared.ts b/clients/client-lookoutvision/runtimeConfig.shared.ts
index 30843d427c0d0..33bb93d77a0c0 100644
--- a/clients/client-lookoutvision/runtimeConfig.shared.ts
+++ b/clients/client-lookoutvision/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "lookoutvision",
+  serviceId: "lookoutvision",
 };
diff --git a/clients/client-machine-learning/MachineLearningClient.ts b/clients/client-machine-learning/MachineLearningClient.ts
index b93afa33c11e5..27d5872e39fd4 100644
--- a/clients/client-machine-learning/MachineLearningClient.ts
+++ b/clients/client-machine-learning/MachineLearningClient.ts
@@ -232,9 +232,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-machine-learning/runtimeConfig.shared.ts b/clients/client-machine-learning/runtimeConfig.shared.ts
index 7b99ad1118ab2..73219556fe64f 100644
--- a/clients/client-machine-learning/runtimeConfig.shared.ts
+++ b/clients/client-machine-learning/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "machinelearning",
+  serviceId: "machinelearning",
 };
diff --git a/clients/client-macie/MacieClient.ts b/clients/client-macie/MacieClient.ts
index ecf35ef88fddc..e4f88b336e2f2 100644
--- a/clients/client-macie/MacieClient.ts
+++ b/clients/client-macie/MacieClient.ts
@@ -148,9 +148,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-macie/runtimeConfig.shared.ts b/clients/client-macie/runtimeConfig.shared.ts
index 3313835e98d9b..59fc48fb39b67 100644
--- a/clients/client-macie/runtimeConfig.shared.ts
+++ b/clients/client-macie/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "macie",
+  serviceId: "macie",
 };
diff --git a/clients/client-macie2/Macie2Client.ts b/clients/client-macie2/Macie2Client.ts
index 47bdd151c2d2b..819416067d5a9 100644
--- a/clients/client-macie2/Macie2Client.ts
+++ b/clients/client-macie2/Macie2Client.ts
@@ -352,9 +352,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-macie2/runtimeConfig.shared.ts b/clients/client-macie2/runtimeConfig.shared.ts
index 97a003d434fa2..41e375019a804 100644
--- a/clients/client-macie2/runtimeConfig.shared.ts
+++ b/clients/client-macie2/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "macie2",
+  serviceId: "macie2",
 };
diff --git a/clients/client-managedblockchain/ManagedBlockchainClient.ts b/clients/client-managedblockchain/ManagedBlockchainClient.ts
index 6c7a50d4cf8db..29c08b1a2a6b5 100644
--- a/clients/client-managedblockchain/ManagedBlockchainClient.ts
+++ b/clients/client-managedblockchain/ManagedBlockchainClient.ts
@@ -175,9 +175,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-managedblockchain/runtimeConfig.shared.ts b/clients/client-managedblockchain/runtimeConfig.shared.ts
index 97bb1a97e83db..6b74220b3c46b 100644
--- a/clients/client-managedblockchain/runtimeConfig.shared.ts
+++ b/clients/client-managedblockchain/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "managedblockchain",
+  serviceId: "managedblockchain",
 };
diff --git a/clients/client-marketplace-catalog/MarketplaceCatalogClient.ts b/clients/client-marketplace-catalog/MarketplaceCatalogClient.ts
index a001da89c72d0..da3780b62caeb 100644
--- a/clients/client-marketplace-catalog/MarketplaceCatalogClient.ts
+++ b/clients/client-marketplace-catalog/MarketplaceCatalogClient.ts
@@ -133,9 +133,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-marketplace-catalog/runtimeConfig.shared.ts b/clients/client-marketplace-catalog/runtimeConfig.shared.ts
index cc54af7d995dd..c94a9456dd31d 100644
--- a/clients/client-marketplace-catalog/runtimeConfig.shared.ts
+++ b/clients/client-marketplace-catalog/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "aws-marketplace",
+  serviceId: "aws-marketplace",
 };
diff --git a/clients/client-marketplace-commerce-analytics/MarketplaceCommerceAnalyticsClient.ts b/clients/client-marketplace-commerce-analytics/MarketplaceCommerceAnalyticsClient.ts
index bb41cee55bd1c..d51affc184459 100644
--- a/clients/client-marketplace-commerce-analytics/MarketplaceCommerceAnalyticsClient.ts
+++ b/clients/client-marketplace-commerce-analytics/MarketplaceCommerceAnalyticsClient.ts
@@ -120,9 +120,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-marketplace-commerce-analytics/runtimeConfig.shared.ts b/clients/client-marketplace-commerce-analytics/runtimeConfig.shared.ts
index 886d91d2980ab..80f52cfd00ffb 100644
--- a/clients/client-marketplace-commerce-analytics/runtimeConfig.shared.ts
+++ b/clients/client-marketplace-commerce-analytics/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "marketplacecommerceanalytics",
+  serviceId: "marketplacecommerceanalytics",
 };
diff --git a/clients/client-marketplace-entitlement-service/MarketplaceEntitlementServiceClient.ts b/clients/client-marketplace-entitlement-service/MarketplaceEntitlementServiceClient.ts
index 1123117f4168d..a6bc0c100f774 100644
--- a/clients/client-marketplace-entitlement-service/MarketplaceEntitlementServiceClient.ts
+++ b/clients/client-marketplace-entitlement-service/MarketplaceEntitlementServiceClient.ts
@@ -116,9 +116,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-marketplace-entitlement-service/runtimeConfig.shared.ts b/clients/client-marketplace-entitlement-service/runtimeConfig.shared.ts
index 05f6cd4d22976..749b010ce76a5 100644
--- a/clients/client-marketplace-entitlement-service/runtimeConfig.shared.ts
+++ b/clients/client-marketplace-entitlement-service/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "aws-marketplace",
+  serviceId: "aws-marketplace",
 };
diff --git a/clients/client-marketplace-metering/MarketplaceMeteringClient.ts b/clients/client-marketplace-metering/MarketplaceMeteringClient.ts
index d35d556aebe33..86597ebe23e72 100644
--- a/clients/client-marketplace-metering/MarketplaceMeteringClient.ts
+++ b/clients/client-marketplace-metering/MarketplaceMeteringClient.ts
@@ -127,9 +127,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-marketplace-metering/runtimeConfig.shared.ts b/clients/client-marketplace-metering/runtimeConfig.shared.ts
index 8487c167630ed..169c1ebf9493d 100644
--- a/clients/client-marketplace-metering/runtimeConfig.shared.ts
+++ b/clients/client-marketplace-metering/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "aws-marketplace",
+  serviceId: "aws-marketplace",
 };
diff --git a/clients/client-mediaconnect/MediaConnectClient.ts b/clients/client-mediaconnect/MediaConnectClient.ts
index a928dd9dce2df..557df93d6ae9e 100644
--- a/clients/client-mediaconnect/MediaConnectClient.ts
+++ b/clients/client-mediaconnect/MediaConnectClient.ts
@@ -217,9 +217,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-mediaconnect/runtimeConfig.shared.ts b/clients/client-mediaconnect/runtimeConfig.shared.ts
index a8de79218f678..9e2462f8edaa3 100644
--- a/clients/client-mediaconnect/runtimeConfig.shared.ts
+++ b/clients/client-mediaconnect/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "mediaconnect",
+  serviceId: "mediaconnect",
 };
diff --git a/clients/client-mediaconvert/MediaConvertClient.ts b/clients/client-mediaconvert/MediaConvertClient.ts
index 50ec08f3ebda2..65e408b3b5fe1 100644
--- a/clients/client-mediaconvert/MediaConvertClient.ts
+++ b/clients/client-mediaconvert/MediaConvertClient.ts
@@ -199,9 +199,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-mediaconvert/runtimeConfig.shared.ts b/clients/client-mediaconvert/runtimeConfig.shared.ts
index 2bf766a894958..5083b4e554251 100644
--- a/clients/client-mediaconvert/runtimeConfig.shared.ts
+++ b/clients/client-mediaconvert/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "mediaconvert",
+  serviceId: "mediaconvert",
 };
diff --git a/clients/client-medialive/MediaLiveClient.ts b/clients/client-medialive/MediaLiveClient.ts
index b8062029d1973..3017f0f00fc82 100644
--- a/clients/client-medialive/MediaLiveClient.ts
+++ b/clients/client-medialive/MediaLiveClient.ts
@@ -340,9 +340,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-medialive/runtimeConfig.shared.ts b/clients/client-medialive/runtimeConfig.shared.ts
index 17b8a20a3c735..650be256c8b73 100644
--- a/clients/client-medialive/runtimeConfig.shared.ts
+++ b/clients/client-medialive/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "medialive",
+  serviceId: "medialive",
 };
diff --git a/clients/client-mediapackage-vod/MediaPackageVodClient.ts b/clients/client-mediapackage-vod/MediaPackageVodClient.ts
index a0c306372e33e..24a4c9f5084cc 100644
--- a/clients/client-mediapackage-vod/MediaPackageVodClient.ts
+++ b/clients/client-mediapackage-vod/MediaPackageVodClient.ts
@@ -193,9 +193,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-mediapackage-vod/runtimeConfig.shared.ts b/clients/client-mediapackage-vod/runtimeConfig.shared.ts
index f964dddf63564..a4b637b4262df 100644
--- a/clients/client-mediapackage-vod/runtimeConfig.shared.ts
+++ b/clients/client-mediapackage-vod/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "mediapackage-vod",
+  serviceId: "mediapackage-vod",
 };
diff --git a/clients/client-mediapackage/MediaPackageClient.ts b/clients/client-mediapackage/MediaPackageClient.ts
index 0476c2cbd9731..7334d9c98da04 100644
--- a/clients/client-mediapackage/MediaPackageClient.ts
+++ b/clients/client-mediapackage/MediaPackageClient.ts
@@ -196,9 +196,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-mediapackage/runtimeConfig.shared.ts b/clients/client-mediapackage/runtimeConfig.shared.ts
index 61fd919e3aed2..542cc859213fd 100644
--- a/clients/client-mediapackage/runtimeConfig.shared.ts
+++ b/clients/client-mediapackage/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "mediapackage",
+  serviceId: "mediapackage",
 };
diff --git a/clients/client-mediastore-data/MediaStoreDataClient.ts b/clients/client-mediastore-data/MediaStoreDataClient.ts
index 319c31017be7b..7838080ad64c6 100644
--- a/clients/client-mediastore-data/MediaStoreDataClient.ts
+++ b/clients/client-mediastore-data/MediaStoreDataClient.ts
@@ -130,9 +130,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-mediastore-data/runtimeConfig.shared.ts b/clients/client-mediastore-data/runtimeConfig.shared.ts
index c2397ab26a013..f4e7f79072329 100644
--- a/clients/client-mediastore-data/runtimeConfig.shared.ts
+++ b/clients/client-mediastore-data/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "mediastore",
+  serviceId: "mediastore",
 };
diff --git a/clients/client-mediastore/MediaStoreClient.ts b/clients/client-mediastore/MediaStoreClient.ts
index 89f6035f30a12..b1b4e5aab8f73 100644
--- a/clients/client-mediastore/MediaStoreClient.ts
+++ b/clients/client-mediastore/MediaStoreClient.ts
@@ -187,9 +187,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-mediastore/runtimeConfig.shared.ts b/clients/client-mediastore/runtimeConfig.shared.ts
index c2397ab26a013..f4e7f79072329 100644
--- a/clients/client-mediastore/runtimeConfig.shared.ts
+++ b/clients/client-mediastore/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "mediastore",
+  serviceId: "mediastore",
 };
diff --git a/clients/client-mediatailor/MediaTailorClient.ts b/clients/client-mediatailor/MediaTailorClient.ts
index 7e330762ef113..ccdfa9fc7b3f8 100644
--- a/clients/client-mediatailor/MediaTailorClient.ts
+++ b/clients/client-mediatailor/MediaTailorClient.ts
@@ -151,9 +151,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-mediatailor/runtimeConfig.shared.ts b/clients/client-mediatailor/runtimeConfig.shared.ts
index cb07f1ce627e3..4aa13d8af1da1 100644
--- a/clients/client-mediatailor/runtimeConfig.shared.ts
+++ b/clients/client-mediatailor/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "mediatailor",
+  serviceId: "mediatailor",
 };
diff --git a/clients/client-migration-hub/MigrationHubClient.ts b/clients/client-migration-hub/MigrationHubClient.ts
index 2ae8d7e2c92cf..82e8e5ef89f14 100644
--- a/clients/client-migration-hub/MigrationHubClient.ts
+++ b/clients/client-migration-hub/MigrationHubClient.ts
@@ -214,9 +214,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-migration-hub/runtimeConfig.shared.ts b/clients/client-migration-hub/runtimeConfig.shared.ts
index 35ca96a9121b5..030c522fca2e8 100644
--- a/clients/client-migration-hub/runtimeConfig.shared.ts
+++ b/clients/client-migration-hub/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "mgh",
+  serviceId: "mgh",
 };
diff --git a/clients/client-migrationhub-config/MigrationHubConfigClient.ts b/clients/client-migrationhub-config/MigrationHubConfigClient.ts
index 187c4e25a3b7a..a77acbedd6904 100644
--- a/clients/client-migrationhub-config/MigrationHubConfigClient.ts
+++ b/clients/client-migrationhub-config/MigrationHubConfigClient.ts
@@ -130,9 +130,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-migrationhub-config/runtimeConfig.shared.ts b/clients/client-migrationhub-config/runtimeConfig.shared.ts
index 56851c14bae2d..cd4d4b08faa4f 100644
--- a/clients/client-migrationhub-config/runtimeConfig.shared.ts
+++ b/clients/client-migrationhub-config/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "mgh",
+  serviceId: "mgh",
 };
diff --git a/clients/client-mobile/MobileClient.ts b/clients/client-mobile/MobileClient.ts
index db68dcaaa37b5..85b1e8eec2f2d 100644
--- a/clients/client-mobile/MobileClient.ts
+++ b/clients/client-mobile/MobileClient.ts
@@ -142,9 +142,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-mobile/runtimeConfig.shared.ts b/clients/client-mobile/runtimeConfig.shared.ts
index 94f4f8047ed0f..0d0057e27886b 100644
--- a/clients/client-mobile/runtimeConfig.shared.ts
+++ b/clients/client-mobile/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "awsmobilehubservice",
+  serviceId: "awsmobilehubservice",
 };
diff --git a/clients/client-mq/MqClient.ts b/clients/client-mq/MqClient.ts
index 8cc3ec3a47edf..efa22e857882c 100644
--- a/clients/client-mq/MqClient.ts
+++ b/clients/client-mq/MqClient.ts
@@ -202,9 +202,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-mq/runtimeConfig.shared.ts b/clients/client-mq/runtimeConfig.shared.ts
index de0d6cf01c194..daff5a886ab65 100644
--- a/clients/client-mq/runtimeConfig.shared.ts
+++ b/clients/client-mq/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "mq",
+  serviceId: "mq",
 };
diff --git a/clients/client-mturk/MTurkClient.ts b/clients/client-mturk/MTurkClient.ts
index c39740a3a9b69..0a442ef6171bc 100644
--- a/clients/client-mturk/MTurkClient.ts
+++ b/clients/client-mturk/MTurkClient.ts
@@ -295,9 +295,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-mturk/runtimeConfig.shared.ts b/clients/client-mturk/runtimeConfig.shared.ts
index de6972339c4be..638b2808118c3 100644
--- a/clients/client-mturk/runtimeConfig.shared.ts
+++ b/clients/client-mturk/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "mturk-requester",
+  serviceId: "mturk-requester",
 };
diff --git a/clients/client-neptune/NeptuneClient.ts b/clients/client-neptune/NeptuneClient.ts
index 4c5f3a6d2726f..d4e4907f238df 100644
--- a/clients/client-neptune/NeptuneClient.ts
+++ b/clients/client-neptune/NeptuneClient.ts
@@ -451,9 +451,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-neptune/runtimeConfig.shared.ts b/clients/client-neptune/runtimeConfig.shared.ts
index 7331c29e5ee1a..b974a689edac3 100644
--- a/clients/client-neptune/runtimeConfig.shared.ts
+++ b/clients/client-neptune/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "rds",
+  serviceId: "rds",
 };
diff --git a/clients/client-network-firewall/NetworkFirewallClient.ts b/clients/client-network-firewall/NetworkFirewallClient.ts
index 20f0755b6be02..5d9a7b15ccd77 100644
--- a/clients/client-network-firewall/NetworkFirewallClient.ts
+++ b/clients/client-network-firewall/NetworkFirewallClient.ts
@@ -250,9 +250,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-network-firewall/runtimeConfig.shared.ts b/clients/client-network-firewall/runtimeConfig.shared.ts
index 9f9f88e080c3c..9da2db7b13dc8 100644
--- a/clients/client-network-firewall/runtimeConfig.shared.ts
+++ b/clients/client-network-firewall/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "network-firewall",
+  serviceId: "network-firewall",
 };
diff --git a/clients/client-networkmanager/NetworkManagerClient.ts b/clients/client-networkmanager/NetworkManagerClient.ts
index 9224c8a40815d..66af6940c701d 100644
--- a/clients/client-networkmanager/NetworkManagerClient.ts
+++ b/clients/client-networkmanager/NetworkManagerClient.ts
@@ -235,9 +235,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-networkmanager/runtimeConfig.shared.ts b/clients/client-networkmanager/runtimeConfig.shared.ts
index 0e4590b57a35f..4c2ca313446a6 100644
--- a/clients/client-networkmanager/runtimeConfig.shared.ts
+++ b/clients/client-networkmanager/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "networkmanager",
+  serviceId: "networkmanager",
 };
diff --git a/clients/client-opsworks/OpsWorksClient.ts b/clients/client-opsworks/OpsWorksClient.ts
index 059a3af305bad..bb373592a0c2d 100644
--- a/clients/client-opsworks/OpsWorksClient.ts
+++ b/clients/client-opsworks/OpsWorksClient.ts
@@ -415,9 +415,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-opsworks/runtimeConfig.shared.ts b/clients/client-opsworks/runtimeConfig.shared.ts
index d24703b790231..32168ace17bc1 100644
--- a/clients/client-opsworks/runtimeConfig.shared.ts
+++ b/clients/client-opsworks/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "opsworks",
+  serviceId: "opsworks",
 };
diff --git a/clients/client-opsworkscm/OpsWorksCMClient.ts b/clients/client-opsworkscm/OpsWorksCMClient.ts
index bd43bcf4d7a6a..9ec3ce2fbf409 100644
--- a/clients/client-opsworkscm/OpsWorksCMClient.ts
+++ b/clients/client-opsworkscm/OpsWorksCMClient.ts
@@ -187,9 +187,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-opsworkscm/runtimeConfig.shared.ts b/clients/client-opsworkscm/runtimeConfig.shared.ts
index b9b38eae429ad..b72776a34ba04 100644
--- a/clients/client-opsworkscm/runtimeConfig.shared.ts
+++ b/clients/client-opsworkscm/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "opsworks-cm",
+  serviceId: "opsworks-cm",
 };
diff --git a/clients/client-organizations/OrganizationsClient.ts b/clients/client-organizations/OrganizationsClient.ts
index b758092e80342..b54d8a2f63cca 100644
--- a/clients/client-organizations/OrganizationsClient.ts
+++ b/clients/client-organizations/OrganizationsClient.ts
@@ -343,9 +343,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-organizations/runtimeConfig.shared.ts b/clients/client-organizations/runtimeConfig.shared.ts
index 19cd902aaace6..c661ec1be9df3 100644
--- a/clients/client-organizations/runtimeConfig.shared.ts
+++ b/clients/client-organizations/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "organizations",
+  serviceId: "organizations",
 };
diff --git a/clients/client-outposts/OutpostsClient.ts b/clients/client-outposts/OutpostsClient.ts
index e0662b65024ed..d26eb71be3568 100644
--- a/clients/client-outposts/OutpostsClient.ts
+++ b/clients/client-outposts/OutpostsClient.ts
@@ -139,9 +139,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-outposts/runtimeConfig.shared.ts b/clients/client-outposts/runtimeConfig.shared.ts
index df54583e84b78..859c2089f8abc 100644
--- a/clients/client-outposts/runtimeConfig.shared.ts
+++ b/clients/client-outposts/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "outposts",
+  serviceId: "outposts",
 };
diff --git a/clients/client-personalize-events/PersonalizeEventsClient.ts b/clients/client-personalize-events/PersonalizeEventsClient.ts
index 3b76f4f56a44f..a7083b118ee4e 100644
--- a/clients/client-personalize-events/PersonalizeEventsClient.ts
+++ b/clients/client-personalize-events/PersonalizeEventsClient.ts
@@ -118,9 +118,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-personalize-events/runtimeConfig.shared.ts b/clients/client-personalize-events/runtimeConfig.shared.ts
index 4f56bb11622a3..42b8938ecd812 100644
--- a/clients/client-personalize-events/runtimeConfig.shared.ts
+++ b/clients/client-personalize-events/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "personalize",
+  serviceId: "personalize",
 };
diff --git a/clients/client-personalize-runtime/PersonalizeRuntimeClient.ts b/clients/client-personalize-runtime/PersonalizeRuntimeClient.ts
index c8c77904f4148..aa2e4cf300c52 100644
--- a/clients/client-personalize-runtime/PersonalizeRuntimeClient.ts
+++ b/clients/client-personalize-runtime/PersonalizeRuntimeClient.ts
@@ -120,9 +120,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-personalize-runtime/runtimeConfig.shared.ts b/clients/client-personalize-runtime/runtimeConfig.shared.ts
index bc6479c212447..afa0416329ddd 100644
--- a/clients/client-personalize-runtime/runtimeConfig.shared.ts
+++ b/clients/client-personalize-runtime/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "personalize",
+  serviceId: "personalize",
 };
diff --git a/clients/client-personalize/PersonalizeClient.ts b/clients/client-personalize/PersonalizeClient.ts
index 7271469585bfa..671dc6b410ec3 100644
--- a/clients/client-personalize/PersonalizeClient.ts
+++ b/clients/client-personalize/PersonalizeClient.ts
@@ -280,9 +280,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-personalize/runtimeConfig.shared.ts b/clients/client-personalize/runtimeConfig.shared.ts
index bc6479c212447..afa0416329ddd 100644
--- a/clients/client-personalize/runtimeConfig.shared.ts
+++ b/clients/client-personalize/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "personalize",
+  serviceId: "personalize",
 };
diff --git a/clients/client-pi/PIClient.ts b/clients/client-pi/PIClient.ts
index 07328c8ebed5b..f3cf5276b6c61 100644
--- a/clients/client-pi/PIClient.ts
+++ b/clients/client-pi/PIClient.ts
@@ -120,9 +120,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-pi/runtimeConfig.shared.ts b/clients/client-pi/runtimeConfig.shared.ts
index 231fe51daa3c3..39e21f457689d 100644
--- a/clients/client-pi/runtimeConfig.shared.ts
+++ b/clients/client-pi/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "pi",
+  serviceId: "pi",
 };
diff --git a/clients/client-pinpoint-email/PinpointEmailClient.ts b/clients/client-pinpoint-email/PinpointEmailClient.ts
index f55f6cdd9b2f4..bf81efa63bacb 100644
--- a/clients/client-pinpoint-email/PinpointEmailClient.ts
+++ b/clients/client-pinpoint-email/PinpointEmailClient.ts
@@ -346,9 +346,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-pinpoint-email/runtimeConfig.shared.ts b/clients/client-pinpoint-email/runtimeConfig.shared.ts
index 17d6613f24e5f..5a26a4d378635 100644
--- a/clients/client-pinpoint-email/runtimeConfig.shared.ts
+++ b/clients/client-pinpoint-email/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ses",
+  serviceId: "ses",
 };
diff --git a/clients/client-pinpoint-sms-voice/PinpointSMSVoiceClient.ts b/clients/client-pinpoint-sms-voice/PinpointSMSVoiceClient.ts
index c11fb747d4792..d4ebe4b192d6e 100644
--- a/clients/client-pinpoint-sms-voice/PinpointSMSVoiceClient.ts
+++ b/clients/client-pinpoint-sms-voice/PinpointSMSVoiceClient.ts
@@ -160,9 +160,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-pinpoint-sms-voice/runtimeConfig.shared.ts b/clients/client-pinpoint-sms-voice/runtimeConfig.shared.ts
index a60641586a20b..f69ecf7cc4ff4 100644
--- a/clients/client-pinpoint-sms-voice/runtimeConfig.shared.ts
+++ b/clients/client-pinpoint-sms-voice/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "sms-voice",
+  serviceId: "sms-voice",
 };
diff --git a/clients/client-pinpoint/PinpointClient.ts b/clients/client-pinpoint/PinpointClient.ts
index d4c496b145766..028bdf5e9913c 100644
--- a/clients/client-pinpoint/PinpointClient.ts
+++ b/clients/client-pinpoint/PinpointClient.ts
@@ -559,9 +559,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-pinpoint/runtimeConfig.shared.ts b/clients/client-pinpoint/runtimeConfig.shared.ts
index 849332a270393..c86dadd9e2ae0 100644
--- a/clients/client-pinpoint/runtimeConfig.shared.ts
+++ b/clients/client-pinpoint/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "mobiletargeting",
+  serviceId: "mobiletargeting",
 };
diff --git a/clients/client-polly/PollyClient.ts b/clients/client-polly/PollyClient.ts
index f95b57e432cb6..c090841946a9c 100644
--- a/clients/client-polly/PollyClient.ts
+++ b/clients/client-polly/PollyClient.ts
@@ -151,9 +151,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-polly/runtimeConfig.shared.ts b/clients/client-polly/runtimeConfig.shared.ts
index 3f25a8c85bbc4..11ae33287a7b6 100644
--- a/clients/client-polly/runtimeConfig.shared.ts
+++ b/clients/client-polly/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "polly",
+  serviceId: "polly",
 };
diff --git a/clients/client-pricing/PricingClient.ts b/clients/client-pricing/PricingClient.ts
index c2f8b4a89d84f..df0e5d62679b6 100644
--- a/clients/client-pricing/PricingClient.ts
+++ b/clients/client-pricing/PricingClient.ts
@@ -121,9 +121,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-pricing/runtimeConfig.shared.ts b/clients/client-pricing/runtimeConfig.shared.ts
index cb821399ad8c2..f10d5868534fd 100644
--- a/clients/client-pricing/runtimeConfig.shared.ts
+++ b/clients/client-pricing/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "pricing",
+  serviceId: "pricing",
 };
diff --git a/clients/client-qldb-session/QLDBSessionClient.ts b/clients/client-qldb-session/QLDBSessionClient.ts
index bb4ea77a45da0..3010230b33503 100644
--- a/clients/client-qldb-session/QLDBSessionClient.ts
+++ b/clients/client-qldb-session/QLDBSessionClient.ts
@@ -116,9 +116,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-qldb-session/runtimeConfig.shared.ts b/clients/client-qldb-session/runtimeConfig.shared.ts
index e762f5e551b38..7f61a2293b1a8 100644
--- a/clients/client-qldb-session/runtimeConfig.shared.ts
+++ b/clients/client-qldb-session/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "qldb",
+  serviceId: "qldb",
 };
diff --git a/clients/client-qldb/QLDBClient.ts b/clients/client-qldb/QLDBClient.ts
index d357a9e096397..78e024bd1dfac 100644
--- a/clients/client-qldb/QLDBClient.ts
+++ b/clients/client-qldb/QLDBClient.ts
@@ -196,9 +196,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-qldb/runtimeConfig.shared.ts b/clients/client-qldb/runtimeConfig.shared.ts
index 6d94c9a8715d6..90465367862a2 100644
--- a/clients/client-qldb/runtimeConfig.shared.ts
+++ b/clients/client-qldb/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "qldb",
+  serviceId: "qldb",
 };
diff --git a/clients/client-quicksight/QuickSightClient.ts b/clients/client-quicksight/QuickSightClient.ts
index bb9a7fd8f403b..1e08316051d1d 100644
--- a/clients/client-quicksight/QuickSightClient.ts
+++ b/clients/client-quicksight/QuickSightClient.ts
@@ -526,9 +526,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-quicksight/runtimeConfig.shared.ts b/clients/client-quicksight/runtimeConfig.shared.ts
index fa6717e9354e7..e16836b285afd 100644
--- a/clients/client-quicksight/runtimeConfig.shared.ts
+++ b/clients/client-quicksight/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "quicksight",
+  serviceId: "quicksight",
 };
diff --git a/clients/client-ram/RAMClient.ts b/clients/client-ram/RAMClient.ts
index 91d1b3e2a9a69..d1e1e1ad8a61e 100644
--- a/clients/client-ram/RAMClient.ts
+++ b/clients/client-ram/RAMClient.ts
@@ -235,9 +235,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-ram/runtimeConfig.shared.ts b/clients/client-ram/runtimeConfig.shared.ts
index ca4ffd62998f4..ea87346dcb50e 100644
--- a/clients/client-ram/runtimeConfig.shared.ts
+++ b/clients/client-ram/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ram",
+  serviceId: "ram",
 };
diff --git a/clients/client-rds-data/RDSDataClient.ts b/clients/client-rds-data/RDSDataClient.ts
index da2eebe579aa3..f391e8b7944ba 100644
--- a/clients/client-rds-data/RDSDataClient.ts
+++ b/clients/client-rds-data/RDSDataClient.ts
@@ -139,9 +139,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-rds-data/runtimeConfig.shared.ts b/clients/client-rds-data/runtimeConfig.shared.ts
index b94ae56d37d4b..53d05e3770b3c 100644
--- a/clients/client-rds-data/runtimeConfig.shared.ts
+++ b/clients/client-rds-data/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "rds-data",
+  serviceId: "rds-data",
 };
diff --git a/clients/client-rds/RDSClient.ts b/clients/client-rds/RDSClient.ts
index 817c3dd668663..57cda35d6402d 100644
--- a/clients/client-rds/RDSClient.ts
+++ b/clients/client-rds/RDSClient.ts
@@ -802,9 +802,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-rds/runtimeConfig.shared.ts b/clients/client-rds/runtimeConfig.shared.ts
index 7331c29e5ee1a..b974a689edac3 100644
--- a/clients/client-rds/runtimeConfig.shared.ts
+++ b/clients/client-rds/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "rds",
+  serviceId: "rds",
 };
diff --git a/clients/client-redshift-data/RedshiftDataClient.ts b/clients/client-redshift-data/RedshiftDataClient.ts
index 99e957788167c..83a4eae5ea2da 100644
--- a/clients/client-redshift-data/RedshiftDataClient.ts
+++ b/clients/client-redshift-data/RedshiftDataClient.ts
@@ -142,9 +142,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-redshift-data/runtimeConfig.shared.ts b/clients/client-redshift-data/runtimeConfig.shared.ts
index f8165b986e58f..57d8473944a2e 100644
--- a/clients/client-redshift-data/runtimeConfig.shared.ts
+++ b/clients/client-redshift-data/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "redshift-data",
+  serviceId: "redshift-data",
 };
diff --git a/clients/client-redshift/RedshiftClient.ts b/clients/client-redshift/RedshiftClient.ts
index c9a22c686aca7..2ab0cfffda959 100644
--- a/clients/client-redshift/RedshiftClient.ts
+++ b/clients/client-redshift/RedshiftClient.ts
@@ -604,9 +604,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-redshift/runtimeConfig.shared.ts b/clients/client-redshift/runtimeConfig.shared.ts
index 96291a05806e8..2876d2416f9a6 100644
--- a/clients/client-redshift/runtimeConfig.shared.ts
+++ b/clients/client-redshift/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "redshift",
+  serviceId: "redshift",
 };
diff --git a/clients/client-rekognition/RekognitionClient.ts b/clients/client-rekognition/RekognitionClient.ts
index bbc06092b86bf..dd3519e6f4d29 100644
--- a/clients/client-rekognition/RekognitionClient.ts
+++ b/clients/client-rekognition/RekognitionClient.ts
@@ -322,9 +322,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-rekognition/runtimeConfig.shared.ts b/clients/client-rekognition/runtimeConfig.shared.ts
index 5244752ee80c9..2e776e9f339d6 100644
--- a/clients/client-rekognition/runtimeConfig.shared.ts
+++ b/clients/client-rekognition/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "rekognition",
+  serviceId: "rekognition",
 };
diff --git a/clients/client-resource-groups-tagging-api/ResourceGroupsTaggingAPIClient.ts b/clients/client-resource-groups-tagging-api/ResourceGroupsTaggingAPIClient.ts
index 6660fa72eb2a1..550ef8af8b123 100644
--- a/clients/client-resource-groups-tagging-api/ResourceGroupsTaggingAPIClient.ts
+++ b/clients/client-resource-groups-tagging-api/ResourceGroupsTaggingAPIClient.ts
@@ -148,9 +148,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-resource-groups-tagging-api/runtimeConfig.shared.ts b/clients/client-resource-groups-tagging-api/runtimeConfig.shared.ts
index 7ad941902fd07..aebb1a40f5337 100644
--- a/clients/client-resource-groups-tagging-api/runtimeConfig.shared.ts
+++ b/clients/client-resource-groups-tagging-api/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "tagging",
+  serviceId: "tagging",
 };
diff --git a/clients/client-resource-groups/ResourceGroupsClient.ts b/clients/client-resource-groups/ResourceGroupsClient.ts
index 71d11c57ce911..c84717252369f 100644
--- a/clients/client-resource-groups/ResourceGroupsClient.ts
+++ b/clients/client-resource-groups/ResourceGroupsClient.ts
@@ -163,9 +163,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-resource-groups/runtimeConfig.shared.ts b/clients/client-resource-groups/runtimeConfig.shared.ts
index 4b80bae7bfd01..50cf85bfb7421 100644
--- a/clients/client-resource-groups/runtimeConfig.shared.ts
+++ b/clients/client-resource-groups/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "resource-groups",
+  serviceId: "resource-groups",
 };
diff --git a/clients/client-robomaker/RoboMakerClient.ts b/clients/client-robomaker/RoboMakerClient.ts
index e1e8e6e120153..5e5c1d86b7726 100644
--- a/clients/client-robomaker/RoboMakerClient.ts
+++ b/clients/client-robomaker/RoboMakerClient.ts
@@ -400,9 +400,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-robomaker/runtimeConfig.shared.ts b/clients/client-robomaker/runtimeConfig.shared.ts
index c017b41b94529..997f63c154c5f 100644
--- a/clients/client-robomaker/runtimeConfig.shared.ts
+++ b/clients/client-robomaker/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "robomaker",
+  serviceId: "robomaker",
 };
diff --git a/clients/client-route-53-domains/Route53DomainsClient.ts b/clients/client-route-53-domains/Route53DomainsClient.ts
index 492e1e6d7c8f9..1d2c7f7b3bead 100644
--- a/clients/client-route-53-domains/Route53DomainsClient.ts
+++ b/clients/client-route-53-domains/Route53DomainsClient.ts
@@ -256,9 +256,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-route-53-domains/runtimeConfig.shared.ts b/clients/client-route-53-domains/runtimeConfig.shared.ts
index 824f01fd3cc10..9802b2e165d46 100644
--- a/clients/client-route-53-domains/runtimeConfig.shared.ts
+++ b/clients/client-route-53-domains/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "route53domains",
+  serviceId: "route53domains",
 };
diff --git a/clients/client-route-53/Route53Client.ts b/clients/client-route-53/Route53Client.ts
index 4a33cf72d92e1..2e451275f75e3 100644
--- a/clients/client-route-53/Route53Client.ts
+++ b/clients/client-route-53/Route53Client.ts
@@ -403,9 +403,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-route-53/runtimeConfig.shared.ts b/clients/client-route-53/runtimeConfig.shared.ts
index c7dfe20c8c37f..69b2a0fbe1c84 100644
--- a/clients/client-route-53/runtimeConfig.shared.ts
+++ b/clients/client-route-53/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "route53",
+  serviceId: "route53",
 };
diff --git a/clients/client-route53resolver/Route53ResolverClient.ts b/clients/client-route53resolver/Route53ResolverClient.ts
index ac04e08e7ffd8..179261dd3c6d1 100644
--- a/clients/client-route53resolver/Route53ResolverClient.ts
+++ b/clients/client-route53resolver/Route53ResolverClient.ts
@@ -286,9 +286,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-route53resolver/runtimeConfig.shared.ts b/clients/client-route53resolver/runtimeConfig.shared.ts
index 9d558dbcfb04d..46fa29a7e62bd 100644
--- a/clients/client-route53resolver/runtimeConfig.shared.ts
+++ b/clients/client-route53resolver/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "route53resolver",
+  serviceId: "route53resolver",
 };
diff --git a/clients/client-s3-control/S3ControlClient.ts b/clients/client-s3-control/S3ControlClient.ts
index 4a15a25c78d70..b2347ab75ba3c 100644
--- a/clients/client-s3-control/S3ControlClient.ts
+++ b/clients/client-s3-control/S3ControlClient.ts
@@ -294,9 +294,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-s3-control/runtimeConfig.shared.ts b/clients/client-s3-control/runtimeConfig.shared.ts
index 6567db954bb1a..bff858e50668e 100644
--- a/clients/client-s3-control/runtimeConfig.shared.ts
+++ b/clients/client-s3-control/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "s3",
+  serviceId: "s3",
 };
diff --git a/clients/client-s3/S3Client.ts b/clients/client-s3/S3Client.ts
index c1836d7a655c1..8470e6d7778d1 100644
--- a/clients/client-s3/S3Client.ts
+++ b/clients/client-s3/S3Client.ts
@@ -554,9 +554,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-s3/runtimeConfig.shared.ts b/clients/client-s3/runtimeConfig.shared.ts
index 60424a24579e6..09d608c51a0c1 100644
--- a/clients/client-s3/runtimeConfig.shared.ts
+++ b/clients/client-s3/runtimeConfig.shared.ts
@@ -9,7 +9,7 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
+  serviceId: "s3",
   signingEscapePath: false,
-  signingName: "s3",
   useArnRegion: false,
 };
diff --git a/clients/client-s3outposts/S3OutpostsClient.ts b/clients/client-s3outposts/S3OutpostsClient.ts
index ababc11c47c5f..ddb0e63df8459 100644
--- a/clients/client-s3outposts/S3OutpostsClient.ts
+++ b/clients/client-s3outposts/S3OutpostsClient.ts
@@ -118,9 +118,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-s3outposts/runtimeConfig.shared.ts b/clients/client-s3outposts/runtimeConfig.shared.ts
index 84d98a6a3fec2..c05b72649efeb 100644
--- a/clients/client-s3outposts/runtimeConfig.shared.ts
+++ b/clients/client-s3outposts/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "s3-outposts",
+  serviceId: "s3-outposts",
 };
diff --git a/clients/client-sagemaker-a2i-runtime/SageMakerA2IRuntimeClient.ts b/clients/client-sagemaker-a2i-runtime/SageMakerA2IRuntimeClient.ts
index 32833ec5db85b..e60180315db47 100644
--- a/clients/client-sagemaker-a2i-runtime/SageMakerA2IRuntimeClient.ts
+++ b/clients/client-sagemaker-a2i-runtime/SageMakerA2IRuntimeClient.ts
@@ -130,9 +130,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sagemaker-a2i-runtime/runtimeConfig.shared.ts b/clients/client-sagemaker-a2i-runtime/runtimeConfig.shared.ts
index 635613f9b7f4c..15d642a2d1e10 100644
--- a/clients/client-sagemaker-a2i-runtime/runtimeConfig.shared.ts
+++ b/clients/client-sagemaker-a2i-runtime/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "sagemaker",
+  serviceId: "sagemaker",
 };
diff --git a/clients/client-sagemaker-edge/SagemakerEdgeClient.ts b/clients/client-sagemaker-edge/SagemakerEdgeClient.ts
index 4f311e17e9efa..d769accc9d3d7 100644
--- a/clients/client-sagemaker-edge/SagemakerEdgeClient.ts
+++ b/clients/client-sagemaker-edge/SagemakerEdgeClient.ts
@@ -120,9 +120,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sagemaker-edge/runtimeConfig.shared.ts b/clients/client-sagemaker-edge/runtimeConfig.shared.ts
index 984e97bcc59b3..e0a298ce4dad6 100644
--- a/clients/client-sagemaker-edge/runtimeConfig.shared.ts
+++ b/clients/client-sagemaker-edge/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "sagemaker",
+  serviceId: "sagemaker",
 };
diff --git a/clients/client-sagemaker-featurestore-runtime/SageMakerFeatureStoreRuntimeClient.ts b/clients/client-sagemaker-featurestore-runtime/SageMakerFeatureStoreRuntimeClient.ts
index 332353d63a7a4..09733c0a9a26b 100644
--- a/clients/client-sagemaker-featurestore-runtime/SageMakerFeatureStoreRuntimeClient.ts
+++ b/clients/client-sagemaker-featurestore-runtime/SageMakerFeatureStoreRuntimeClient.ts
@@ -118,9 +118,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sagemaker-featurestore-runtime/runtimeConfig.shared.ts b/clients/client-sagemaker-featurestore-runtime/runtimeConfig.shared.ts
index fa67e5168746c..f9836baa17062 100644
--- a/clients/client-sagemaker-featurestore-runtime/runtimeConfig.shared.ts
+++ b/clients/client-sagemaker-featurestore-runtime/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "sagemaker",
+  serviceId: "sagemaker",
 };
diff --git a/clients/client-sagemaker-runtime/SageMakerRuntimeClient.ts b/clients/client-sagemaker-runtime/SageMakerRuntimeClient.ts
index 76848af96885d..30b90bbf9b741 100644
--- a/clients/client-sagemaker-runtime/SageMakerRuntimeClient.ts
+++ b/clients/client-sagemaker-runtime/SageMakerRuntimeClient.ts
@@ -116,9 +116,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sagemaker-runtime/runtimeConfig.shared.ts b/clients/client-sagemaker-runtime/runtimeConfig.shared.ts
index d5b73967bdb7b..f8ad6f1c46065 100644
--- a/clients/client-sagemaker-runtime/runtimeConfig.shared.ts
+++ b/clients/client-sagemaker-runtime/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "sagemaker",
+  serviceId: "sagemaker",
 };
diff --git a/clients/client-sagemaker/SageMakerClient.ts b/clients/client-sagemaker/SageMakerClient.ts
index 80d51d5a479b1..dc613c3984c99 100644
--- a/clients/client-sagemaker/SageMakerClient.ts
+++ b/clients/client-sagemaker/SageMakerClient.ts
@@ -1147,9 +1147,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sagemaker/runtimeConfig.shared.ts b/clients/client-sagemaker/runtimeConfig.shared.ts
index a1ddeeb738313..720e0fdd9f8b4 100644
--- a/clients/client-sagemaker/runtimeConfig.shared.ts
+++ b/clients/client-sagemaker/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "sagemaker",
+  serviceId: "sagemaker",
 };
diff --git a/clients/client-savingsplans/SavingsplansClient.ts b/clients/client-savingsplans/SavingsplansClient.ts
index 420b810fba95e..b5095fa5a77e9 100644
--- a/clients/client-savingsplans/SavingsplansClient.ts
+++ b/clients/client-savingsplans/SavingsplansClient.ts
@@ -160,9 +160,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-savingsplans/runtimeConfig.shared.ts b/clients/client-savingsplans/runtimeConfig.shared.ts
index 159cfde35d7e6..b6c84a93bc9e3 100644
--- a/clients/client-savingsplans/runtimeConfig.shared.ts
+++ b/clients/client-savingsplans/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "savingsplans",
+  serviceId: "savingsplans",
 };
diff --git a/clients/client-schemas/SchemasClient.ts b/clients/client-schemas/SchemasClient.ts
index 1cd9417dc1b93..acbd6fda9d8a0 100644
--- a/clients/client-schemas/SchemasClient.ts
+++ b/clients/client-schemas/SchemasClient.ts
@@ -226,9 +226,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-schemas/runtimeConfig.shared.ts b/clients/client-schemas/runtimeConfig.shared.ts
index c7c9f23e941b4..b1ad261647d69 100644
--- a/clients/client-schemas/runtimeConfig.shared.ts
+++ b/clients/client-schemas/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "schemas",
+  serviceId: "schemas",
 };
diff --git a/clients/client-secrets-manager/SecretsManagerClient.ts b/clients/client-secrets-manager/SecretsManagerClient.ts
index 34585f82cd356..b42a55d3449bd 100644
--- a/clients/client-secrets-manager/SecretsManagerClient.ts
+++ b/clients/client-secrets-manager/SecretsManagerClient.ts
@@ -184,9 +184,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-secrets-manager/runtimeConfig.shared.ts b/clients/client-secrets-manager/runtimeConfig.shared.ts
index fe9b3c5f217d8..f6901322d5b81 100644
--- a/clients/client-secrets-manager/runtimeConfig.shared.ts
+++ b/clients/client-secrets-manager/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "secretsmanager",
+  serviceId: "secretsmanager",
 };
diff --git a/clients/client-securityhub/SecurityHubClient.ts b/clients/client-securityhub/SecurityHubClient.ts
index e9345208afe72..c6da8a7cc61bc 100644
--- a/clients/client-securityhub/SecurityHubClient.ts
+++ b/clients/client-securityhub/SecurityHubClient.ts
@@ -322,9 +322,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-securityhub/runtimeConfig.shared.ts b/clients/client-securityhub/runtimeConfig.shared.ts
index 43d746254bcfd..799dbbcebfc42 100644
--- a/clients/client-securityhub/runtimeConfig.shared.ts
+++ b/clients/client-securityhub/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "securityhub",
+  serviceId: "securityhub",
 };
diff --git a/clients/client-serverlessapplicationrepository/ServerlessApplicationRepositoryClient.ts b/clients/client-serverlessapplicationrepository/ServerlessApplicationRepositoryClient.ts
index 7e65f9c8f01ed..bb4bc7e1bad67 100644
--- a/clients/client-serverlessapplicationrepository/ServerlessApplicationRepositoryClient.ts
+++ b/clients/client-serverlessapplicationrepository/ServerlessApplicationRepositoryClient.ts
@@ -181,9 +181,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-serverlessapplicationrepository/runtimeConfig.shared.ts b/clients/client-serverlessapplicationrepository/runtimeConfig.shared.ts
index 9a8357e178747..f08d9291d8d1a 100644
--- a/clients/client-serverlessapplicationrepository/runtimeConfig.shared.ts
+++ b/clients/client-serverlessapplicationrepository/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "serverlessrepo",
+  serviceId: "serverlessrepo",
 };
diff --git a/clients/client-service-catalog-appregistry/ServiceCatalogAppRegistryClient.ts b/clients/client-service-catalog-appregistry/ServiceCatalogAppRegistryClient.ts
index 5e8a543199cc8..5092cbcbeb025 100644
--- a/clients/client-service-catalog-appregistry/ServiceCatalogAppRegistryClient.ts
+++ b/clients/client-service-catalog-appregistry/ServiceCatalogAppRegistryClient.ts
@@ -202,9 +202,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-service-catalog-appregistry/runtimeConfig.shared.ts b/clients/client-service-catalog-appregistry/runtimeConfig.shared.ts
index e157efe58b752..d9042d1d94000 100644
--- a/clients/client-service-catalog-appregistry/runtimeConfig.shared.ts
+++ b/clients/client-service-catalog-appregistry/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "servicecatalog",
+  serviceId: "servicecatalog",
 };
diff --git a/clients/client-service-catalog/ServiceCatalogClient.ts b/clients/client-service-catalog/ServiceCatalogClient.ts
index 8757af413a088..bec6c821a9170 100644
--- a/clients/client-service-catalog/ServiceCatalogClient.ts
+++ b/clients/client-service-catalog/ServiceCatalogClient.ts
@@ -550,9 +550,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-service-catalog/runtimeConfig.shared.ts b/clients/client-service-catalog/runtimeConfig.shared.ts
index 4ab746fd1c392..f7a87873e6a92 100644
--- a/clients/client-service-catalog/runtimeConfig.shared.ts
+++ b/clients/client-service-catalog/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "servicecatalog",
+  serviceId: "servicecatalog",
 };
diff --git a/clients/client-service-quotas/ServiceQuotasClient.ts b/clients/client-service-quotas/ServiceQuotasClient.ts
index 62c31a334e52b..678437a9809a6 100644
--- a/clients/client-service-quotas/ServiceQuotasClient.ts
+++ b/clients/client-service-quotas/ServiceQuotasClient.ts
@@ -202,9 +202,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-service-quotas/runtimeConfig.shared.ts b/clients/client-service-quotas/runtimeConfig.shared.ts
index 485229b5fabf1..54915fa229582 100644
--- a/clients/client-service-quotas/runtimeConfig.shared.ts
+++ b/clients/client-service-quotas/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "servicequotas",
+  serviceId: "servicequotas",
 };
diff --git a/clients/client-servicediscovery/ServiceDiscoveryClient.ts b/clients/client-servicediscovery/ServiceDiscoveryClient.ts
index d23ffb3fbaa5d..d020d85f32a11 100644
--- a/clients/client-servicediscovery/ServiceDiscoveryClient.ts
+++ b/clients/client-servicediscovery/ServiceDiscoveryClient.ts
@@ -202,9 +202,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-servicediscovery/runtimeConfig.shared.ts b/clients/client-servicediscovery/runtimeConfig.shared.ts
index e2f377e5ee868..b8e871acc1005 100644
--- a/clients/client-servicediscovery/runtimeConfig.shared.ts
+++ b/clients/client-servicediscovery/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "servicediscovery",
+  serviceId: "servicediscovery",
 };
diff --git a/clients/client-ses/SESClient.ts b/clients/client-ses/SESClient.ts
index 215d7d0ad6088..a5907055bcd98 100644
--- a/clients/client-ses/SESClient.ts
+++ b/clients/client-ses/SESClient.ts
@@ -478,9 +478,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-ses/runtimeConfig.shared.ts b/clients/client-ses/runtimeConfig.shared.ts
index 45cbbef7b9ff2..8b98d07cf78f8 100644
--- a/clients/client-ses/runtimeConfig.shared.ts
+++ b/clients/client-ses/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ses",
+  serviceId: "ses",
 };
diff --git a/clients/client-sesv2/SESv2Client.ts b/clients/client-sesv2/SESv2Client.ts
index b8142eda9d2a1..aab8855655969 100644
--- a/clients/client-sesv2/SESv2Client.ts
+++ b/clients/client-sesv2/SESv2Client.ts
@@ -523,9 +523,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sesv2/runtimeConfig.shared.ts b/clients/client-sesv2/runtimeConfig.shared.ts
index 05e41364d2f01..17183978595da 100644
--- a/clients/client-sesv2/runtimeConfig.shared.ts
+++ b/clients/client-sesv2/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ses",
+  serviceId: "ses",
 };
diff --git a/clients/client-sfn/SFNClient.ts b/clients/client-sfn/SFNClient.ts
index 39679e6d6dac0..f900342f62369 100644
--- a/clients/client-sfn/SFNClient.ts
+++ b/clients/client-sfn/SFNClient.ts
@@ -196,9 +196,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sfn/runtimeConfig.shared.ts b/clients/client-sfn/runtimeConfig.shared.ts
index f4047c3686418..aad3cf5e02a97 100644
--- a/clients/client-sfn/runtimeConfig.shared.ts
+++ b/clients/client-sfn/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "states",
+  serviceId: "states",
 };
diff --git a/clients/client-shield/ShieldClient.ts b/clients/client-shield/ShieldClient.ts
index 360624e0309b7..927bd005b20e4 100644
--- a/clients/client-shield/ShieldClient.ts
+++ b/clients/client-shield/ShieldClient.ts
@@ -262,9 +262,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-shield/runtimeConfig.shared.ts b/clients/client-shield/runtimeConfig.shared.ts
index c7494141d67f6..4a1c9b180f6f4 100644
--- a/clients/client-shield/runtimeConfig.shared.ts
+++ b/clients/client-shield/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "shield",
+  serviceId: "shield",
 };
diff --git a/clients/client-signer/SignerClient.ts b/clients/client-signer/SignerClient.ts
index 5a514d54c2071..7ef9a065778f8 100644
--- a/clients/client-signer/SignerClient.ts
+++ b/clients/client-signer/SignerClient.ts
@@ -190,9 +190,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-signer/runtimeConfig.shared.ts b/clients/client-signer/runtimeConfig.shared.ts
index 3dbd878ca087e..5db5b0dbb51e7 100644
--- a/clients/client-signer/runtimeConfig.shared.ts
+++ b/clients/client-signer/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "signer",
+  serviceId: "signer",
 };
diff --git a/clients/client-sms/SMSClient.ts b/clients/client-sms/SMSClient.ts
index f0f43406f4b33..de5f6db2966d1 100644
--- a/clients/client-sms/SMSClient.ts
+++ b/clients/client-sms/SMSClient.ts
@@ -280,9 +280,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sms/runtimeConfig.shared.ts b/clients/client-sms/runtimeConfig.shared.ts
index ce833c2440fa5..cb383df9359af 100644
--- a/clients/client-sms/runtimeConfig.shared.ts
+++ b/clients/client-sms/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "sms",
+  serviceId: "sms",
 };
diff --git a/clients/client-snowball/SnowballClient.ts b/clients/client-snowball/SnowballClient.ts
index 832a685684391..8e4333a77d91d 100644
--- a/clients/client-snowball/SnowballClient.ts
+++ b/clients/client-snowball/SnowballClient.ts
@@ -193,9 +193,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-snowball/runtimeConfig.shared.ts b/clients/client-snowball/runtimeConfig.shared.ts
index 9ce339128223d..c467bfb2eb55d 100644
--- a/clients/client-snowball/runtimeConfig.shared.ts
+++ b/clients/client-snowball/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "snowball",
+  serviceId: "snowball",
 };
diff --git a/clients/client-sns/SNSClient.ts b/clients/client-sns/SNSClient.ts
index 96e6099ecdc99..70e7b04843675 100644
--- a/clients/client-sns/SNSClient.ts
+++ b/clients/client-sns/SNSClient.ts
@@ -262,9 +262,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sns/runtimeConfig.shared.ts b/clients/client-sns/runtimeConfig.shared.ts
index cec88f4886b76..0792a84fbb199 100644
--- a/clients/client-sns/runtimeConfig.shared.ts
+++ b/clients/client-sns/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "sns",
+  serviceId: "sns",
 };
diff --git a/clients/client-sqs/SQSClient.ts b/clients/client-sqs/SQSClient.ts
index 0a99e9805dcec..f046232304d7b 100644
--- a/clients/client-sqs/SQSClient.ts
+++ b/clients/client-sqs/SQSClient.ts
@@ -184,9 +184,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sqs/runtimeConfig.shared.ts b/clients/client-sqs/runtimeConfig.shared.ts
index e8ef54f1ba96d..27f808fed75e3 100644
--- a/clients/client-sqs/runtimeConfig.shared.ts
+++ b/clients/client-sqs/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "sqs",
+  serviceId: "sqs",
 };
diff --git a/clients/client-ssm/SSMClient.ts b/clients/client-ssm/SSMClient.ts
index 06d959fc915c8..df1d89e3066d6 100644
--- a/clients/client-ssm/SSMClient.ts
+++ b/clients/client-ssm/SSMClient.ts
@@ -745,9 +745,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-ssm/runtimeConfig.shared.ts b/clients/client-ssm/runtimeConfig.shared.ts
index de4435fb41138..575dd016bf643 100644
--- a/clients/client-ssm/runtimeConfig.shared.ts
+++ b/clients/client-ssm/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "ssm",
+  serviceId: "ssm",
 };
diff --git a/clients/client-sso-admin/SSOAdminClient.ts b/clients/client-sso-admin/SSOAdminClient.ts
index ca19144c4b695..4fbab42fab83f 100644
--- a/clients/client-sso-admin/SSOAdminClient.ts
+++ b/clients/client-sso-admin/SSOAdminClient.ts
@@ -289,9 +289,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sso-admin/runtimeConfig.shared.ts b/clients/client-sso-admin/runtimeConfig.shared.ts
index 7aea7e643064d..7d7dfd6b97fce 100644
--- a/clients/client-sso-admin/runtimeConfig.shared.ts
+++ b/clients/client-sso-admin/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "sso",
+  serviceId: "sso",
 };
diff --git a/clients/client-sso-oidc/SSOOIDCClient.ts b/clients/client-sso-oidc/SSOOIDCClient.ts
index e44a19982bb84..4d04fbd30266e 100644
--- a/clients/client-sso-oidc/SSOOIDCClient.ts
+++ b/clients/client-sso-oidc/SSOOIDCClient.ts
@@ -127,9 +127,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sso-oidc/runtimeConfig.shared.ts b/clients/client-sso-oidc/runtimeConfig.shared.ts
index 7f27f551acaab..2cc18a2d08a41 100644
--- a/clients/client-sso-oidc/runtimeConfig.shared.ts
+++ b/clients/client-sso-oidc/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "awsssooidc",
+  serviceId: "awsssooidc",
 };
diff --git a/clients/client-sso/SSOClient.ts b/clients/client-sso/SSOClient.ts
index c6047783becff..78f0f7250c8e0 100644
--- a/clients/client-sso/SSOClient.ts
+++ b/clients/client-sso/SSOClient.ts
@@ -122,9 +122,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sso/runtimeConfig.shared.ts b/clients/client-sso/runtimeConfig.shared.ts
index fb6a0e30f7c04..cd2235ebb867f 100644
--- a/clients/client-sso/runtimeConfig.shared.ts
+++ b/clients/client-sso/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "awsssoportal",
+  serviceId: "awsssoportal",
 };
diff --git a/clients/client-storage-gateway/StorageGatewayClient.ts b/clients/client-storage-gateway/StorageGatewayClient.ts
index 3de05b49cd27f..e19ddd02316cb 100644
--- a/clients/client-storage-gateway/StorageGatewayClient.ts
+++ b/clients/client-storage-gateway/StorageGatewayClient.ts
@@ -502,9 +502,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-storage-gateway/runtimeConfig.shared.ts b/clients/client-storage-gateway/runtimeConfig.shared.ts
index b8cd0f0d535eb..5adb1f71eaa01 100644
--- a/clients/client-storage-gateway/runtimeConfig.shared.ts
+++ b/clients/client-storage-gateway/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "storagegateway",
+  serviceId: "storagegateway",
 };
diff --git a/clients/client-sts/STSClient.ts b/clients/client-sts/STSClient.ts
index 866706f2200f5..b5554ddbccc25 100644
--- a/clients/client-sts/STSClient.ts
+++ b/clients/client-sts/STSClient.ts
@@ -140,9 +140,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-sts/runtimeConfig.shared.ts b/clients/client-sts/runtimeConfig.shared.ts
index 4048713456856..7720f7a7b9ac5 100644
--- a/clients/client-sts/runtimeConfig.shared.ts
+++ b/clients/client-sts/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "sts",
+  serviceId: "sts",
 };
diff --git a/clients/client-support/SupportClient.ts b/clients/client-support/SupportClient.ts
index 58ce9844ee190..effc949b286ab 100644
--- a/clients/client-support/SupportClient.ts
+++ b/clients/client-support/SupportClient.ts
@@ -184,9 +184,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-support/runtimeConfig.shared.ts b/clients/client-support/runtimeConfig.shared.ts
index 6baa452d99308..fa429f081d0f0 100644
--- a/clients/client-support/runtimeConfig.shared.ts
+++ b/clients/client-support/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "support",
+  serviceId: "support",
 };
diff --git a/clients/client-swf/SWFClient.ts b/clients/client-swf/SWFClient.ts
index 5d655b2f607dd..0bca73e993ffd 100644
--- a/clients/client-swf/SWFClient.ts
+++ b/clients/client-swf/SWFClient.ts
@@ -310,9 +310,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-swf/runtimeConfig.shared.ts b/clients/client-swf/runtimeConfig.shared.ts
index 7a071c97e26ae..10ee85c517b22 100644
--- a/clients/client-swf/runtimeConfig.shared.ts
+++ b/clients/client-swf/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "swf",
+  serviceId: "swf",
 };
diff --git a/clients/client-synthetics/SyntheticsClient.ts b/clients/client-synthetics/SyntheticsClient.ts
index 4375e22635f9f..af58ef094e420 100644
--- a/clients/client-synthetics/SyntheticsClient.ts
+++ b/clients/client-synthetics/SyntheticsClient.ts
@@ -163,9 +163,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-synthetics/runtimeConfig.shared.ts b/clients/client-synthetics/runtimeConfig.shared.ts
index e775de70c889b..085d38b14dcfe 100644
--- a/clients/client-synthetics/runtimeConfig.shared.ts
+++ b/clients/client-synthetics/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "synthetics",
+  serviceId: "synthetics",
 };
diff --git a/clients/client-textract/TextractClient.ts b/clients/client-textract/TextractClient.ts
index 6f7a1d2c0049d..f44c90ae41971 100644
--- a/clients/client-textract/TextractClient.ts
+++ b/clients/client-textract/TextractClient.ts
@@ -145,9 +145,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-textract/runtimeConfig.shared.ts b/clients/client-textract/runtimeConfig.shared.ts
index 90e083623a0db..79413031363f1 100644
--- a/clients/client-textract/runtimeConfig.shared.ts
+++ b/clients/client-textract/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "textract",
+  serviceId: "textract",
 };
diff --git a/clients/client-timestream-query/TimestreamQueryClient.ts b/clients/client-timestream-query/TimestreamQueryClient.ts
index 2a8763453998d..2ba271e919db7 100644
--- a/clients/client-timestream-query/TimestreamQueryClient.ts
+++ b/clients/client-timestream-query/TimestreamQueryClient.ts
@@ -118,9 +118,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-timestream-query/runtimeConfig.shared.ts b/clients/client-timestream-query/runtimeConfig.shared.ts
index 2b1062fc96b34..e68cbf1754c2b 100644
--- a/clients/client-timestream-query/runtimeConfig.shared.ts
+++ b/clients/client-timestream-query/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "timestream",
+  serviceId: "timestream",
 };
diff --git a/clients/client-timestream-write/TimestreamWriteClient.ts b/clients/client-timestream-write/TimestreamWriteClient.ts
index 575573a3149c7..a0641cc2f60e2 100644
--- a/clients/client-timestream-write/TimestreamWriteClient.ts
+++ b/clients/client-timestream-write/TimestreamWriteClient.ts
@@ -163,9 +163,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-timestream-write/runtimeConfig.shared.ts b/clients/client-timestream-write/runtimeConfig.shared.ts
index 2b1062fc96b34..e68cbf1754c2b 100644
--- a/clients/client-timestream-write/runtimeConfig.shared.ts
+++ b/clients/client-timestream-write/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "timestream",
+  serviceId: "timestream",
 };
diff --git a/clients/client-transcribe-streaming/TranscribeStreamingClient.ts b/clients/client-transcribe-streaming/TranscribeStreamingClient.ts
index ecb6703402e4a..aa7ff40c3a8b7 100644
--- a/clients/client-transcribe-streaming/TranscribeStreamingClient.ts
+++ b/clients/client-transcribe-streaming/TranscribeStreamingClient.ts
@@ -141,9 +141,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-transcribe-streaming/runtimeConfig.shared.ts b/clients/client-transcribe-streaming/runtimeConfig.shared.ts
index 19c51e8088c03..9f4eccfd5f64f 100644
--- a/clients/client-transcribe-streaming/runtimeConfig.shared.ts
+++ b/clients/client-transcribe-streaming/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "transcribe",
+  serviceId: "transcribe",
 };
diff --git a/clients/client-transcribe/TranscribeClient.ts b/clients/client-transcribe/TranscribeClient.ts
index fde894e2c6c46..3bd7170fc4b34 100644
--- a/clients/client-transcribe/TranscribeClient.ts
+++ b/clients/client-transcribe/TranscribeClient.ts
@@ -259,9 +259,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-transcribe/runtimeConfig.shared.ts b/clients/client-transcribe/runtimeConfig.shared.ts
index 19c51e8088c03..9f4eccfd5f64f 100644
--- a/clients/client-transcribe/runtimeConfig.shared.ts
+++ b/clients/client-transcribe/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "transcribe",
+  serviceId: "transcribe",
 };
diff --git a/clients/client-transfer/TransferClient.ts b/clients/client-transfer/TransferClient.ts
index e8b2391b61667..8aea33e09ce80 100644
--- a/clients/client-transfer/TransferClient.ts
+++ b/clients/client-transfer/TransferClient.ts
@@ -187,9 +187,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-transfer/runtimeConfig.shared.ts b/clients/client-transfer/runtimeConfig.shared.ts
index 71ded8d740acf..2cefa259110ad 100644
--- a/clients/client-transfer/runtimeConfig.shared.ts
+++ b/clients/client-transfer/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "transfer",
+  serviceId: "transfer",
 };
diff --git a/clients/client-translate/TranslateClient.ts b/clients/client-translate/TranslateClient.ts
index b33391532826e..4329be8139ff3 100644
--- a/clients/client-translate/TranslateClient.ts
+++ b/clients/client-translate/TranslateClient.ts
@@ -169,9 +169,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-translate/runtimeConfig.shared.ts b/clients/client-translate/runtimeConfig.shared.ts
index 578c21facb396..6e01b67f9b9d0 100644
--- a/clients/client-translate/runtimeConfig.shared.ts
+++ b/clients/client-translate/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "translate",
+  serviceId: "translate",
 };
diff --git a/clients/client-waf-regional/WAFRegionalClient.ts b/clients/client-waf-regional/WAFRegionalClient.ts
index 7eb00adf5eb0e..997a77ed2c41d 100644
--- a/clients/client-waf-regional/WAFRegionalClient.ts
+++ b/clients/client-waf-regional/WAFRegionalClient.ts
@@ -463,9 +463,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-waf-regional/runtimeConfig.shared.ts b/clients/client-waf-regional/runtimeConfig.shared.ts
index 929703f535f5a..e13a747ce577e 100644
--- a/clients/client-waf-regional/runtimeConfig.shared.ts
+++ b/clients/client-waf-regional/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "waf-regional",
+  serviceId: "waf-regional",
 };
diff --git a/clients/client-waf/WAFClient.ts b/clients/client-waf/WAFClient.ts
index 3e8d47675932b..e42413b835940 100644
--- a/clients/client-waf/WAFClient.ts
+++ b/clients/client-waf/WAFClient.ts
@@ -445,9 +445,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-waf/runtimeConfig.shared.ts b/clients/client-waf/runtimeConfig.shared.ts
index 56db61c42196e..e3126fabd99db 100644
--- a/clients/client-waf/runtimeConfig.shared.ts
+++ b/clients/client-waf/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "waf",
+  serviceId: "waf",
 };
diff --git a/clients/client-wafv2/WAFV2Client.ts b/clients/client-wafv2/WAFV2Client.ts
index a876a4f99a320..7b291054c4de2 100644
--- a/clients/client-wafv2/WAFV2Client.ts
+++ b/clients/client-wafv2/WAFV2Client.ts
@@ -289,9 +289,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-wafv2/runtimeConfig.shared.ts b/clients/client-wafv2/runtimeConfig.shared.ts
index 56d5895deaf3c..b7cf4779f72cc 100644
--- a/clients/client-wafv2/runtimeConfig.shared.ts
+++ b/clients/client-wafv2/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "wafv2",
+  serviceId: "wafv2",
 };
diff --git a/clients/client-workdocs/WorkDocsClient.ts b/clients/client-workdocs/WorkDocsClient.ts
index 75771cd1c7c71..bceaa86fe5f69 100644
--- a/clients/client-workdocs/WorkDocsClient.ts
+++ b/clients/client-workdocs/WorkDocsClient.ts
@@ -286,9 +286,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-workdocs/runtimeConfig.shared.ts b/clients/client-workdocs/runtimeConfig.shared.ts
index 253c00c35382e..3d6e19679ff7d 100644
--- a/clients/client-workdocs/runtimeConfig.shared.ts
+++ b/clients/client-workdocs/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "workdocs",
+  serviceId: "workdocs",
 };
diff --git a/clients/client-worklink/WorkLinkClient.ts b/clients/client-worklink/WorkLinkClient.ts
index b5721a60ce797..e9ae05b9e611f 100644
--- a/clients/client-worklink/WorkLinkClient.ts
+++ b/clients/client-worklink/WorkLinkClient.ts
@@ -274,9 +274,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-worklink/runtimeConfig.shared.ts b/clients/client-worklink/runtimeConfig.shared.ts
index d2a15e309cce7..e7a66376a0501 100644
--- a/clients/client-worklink/runtimeConfig.shared.ts
+++ b/clients/client-worklink/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "worklink",
+  serviceId: "worklink",
 };
diff --git a/clients/client-workmail/WorkMailClient.ts b/clients/client-workmail/WorkMailClient.ts
index 3019feb165df0..a848bb7eda52d 100644
--- a/clients/client-workmail/WorkMailClient.ts
+++ b/clients/client-workmail/WorkMailClient.ts
@@ -328,9 +328,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-workmail/runtimeConfig.shared.ts b/clients/client-workmail/runtimeConfig.shared.ts
index d1faf1c78b044..9b7e957fc7429 100644
--- a/clients/client-workmail/runtimeConfig.shared.ts
+++ b/clients/client-workmail/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "workmail",
+  serviceId: "workmail",
 };
diff --git a/clients/client-workmailmessageflow/WorkMailMessageFlowClient.ts b/clients/client-workmailmessageflow/WorkMailMessageFlowClient.ts
index 6d45f4ea4306f..909297966bd5c 100644
--- a/clients/client-workmailmessageflow/WorkMailMessageFlowClient.ts
+++ b/clients/client-workmailmessageflow/WorkMailMessageFlowClient.ts
@@ -119,9 +119,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-workmailmessageflow/runtimeConfig.shared.ts b/clients/client-workmailmessageflow/runtimeConfig.shared.ts
index 23cab70a79ad3..e5ee0680ab14e 100644
--- a/clients/client-workmailmessageflow/runtimeConfig.shared.ts
+++ b/clients/client-workmailmessageflow/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "workmailmessageflow",
+  serviceId: "workmailmessageflow",
 };
diff --git a/clients/client-workspaces/WorkSpacesClient.ts b/clients/client-workspaces/WorkSpacesClient.ts
index f8d8332712bab..312aa21640226 100644
--- a/clients/client-workspaces/WorkSpacesClient.ts
+++ b/clients/client-workspaces/WorkSpacesClient.ts
@@ -355,9 +355,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-workspaces/runtimeConfig.shared.ts b/clients/client-workspaces/runtimeConfig.shared.ts
index ff57ea55025f3..c2bf3f84a51d1 100644
--- a/clients/client-workspaces/runtimeConfig.shared.ts
+++ b/clients/client-workspaces/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "workspaces",
+  serviceId: "workspaces",
 };
diff --git a/clients/client-xray/XRayClient.ts b/clients/client-xray/XRayClient.ts
index 061a8d0ed6216..fec4ca2d5183f 100644
--- a/clients/client-xray/XRayClient.ts
+++ b/clients/client-xray/XRayClient.ts
@@ -220,9 +220,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/clients/client-xray/runtimeConfig.shared.ts b/clients/client-xray/runtimeConfig.shared.ts
index 42ade9a2181f5..633fba2aefc27 100644
--- a/clients/client-xray/runtimeConfig.shared.ts
+++ b/clients/client-xray/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "xray",
+  serviceId: "xray",
 };
diff --git a/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AddAwsRuntimeConfig.java b/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AddAwsRuntimeConfig.java
index 6c8a81f188517..1ecf7949238a7 100644
--- a/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AddAwsRuntimeConfig.java
+++ b/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AddAwsRuntimeConfig.java
@@ -32,14 +32,14 @@
 import software.amazon.smithy.utils.MapUtils;
 
 /**
- * AWS clients need to know the service name used to sign requests,
+ * AWS clients need to know the service name for collecting metrics,
  * credentials for signing requests, and the region name used to resolve
  * endpoints.
  *
  * <p>This plugin adds the following config interface fields:
  *
  * <ul>
- *     <li>signingName: Defines the service name that signs AWS requests.</li>
+ *     <li>serviceId: Unique name to identify the service.</li>
  *     <li>credentialDefaultProvider: Provides credentials if no credentials
  *     are explicitly provided.</li>
  *     <li>region: The AWS region to which this client will send requests</li>
@@ -51,7 +51,7 @@
  * <p>This plugin adds the following Node runtime specific values:
  *
  * <ul>
- *     <li>signingName: Sets this to the signing name derived from the model.</li>
+ *     <li>serviceId: Unique name to identify the service.</li>
  *     <li>credentialDefaultProvider: Uses the default credential provider that
  *     checks things like environment variables and the AWS config file.</li>
  *     <li>region: Uses the default region provider that checks things like
@@ -64,7 +64,7 @@
  * <p>This plugin adds the following Browser runtime specific values:
  *
  * <ul>
- *     <li>signingName: Sets this to the signing name derived from the model.</li>
+ *     <li>serviceId: Unique name to identify the service.</li>
  *     <li>credentialDefaultProvider: Throws an exception since credentials must
  *     be explicitly provided in the browser (environment variables and
  *     the shared config can't be resolved from the browser).</li>
@@ -90,8 +90,8 @@ public void addConfigInterfaceFields(
         writer.addImport("Credentials", "__Credentials", TypeScriptDependency.AWS_SDK_TYPES.packageName);
         writer.addImport("Logger", "__Logger", TypeScriptDependency.AWS_SDK_TYPES.packageName);
 
-        writer.writeDocs("The service name with which to sign requests.")
-                .write("signingName?: string;\n");
+        writer.writeDocs("Unique service identifier.\n@internal")
+                .write("serviceId?: string;\n");
         writer.writeDocs("Default credentials provider; Not available in browser runtime")
                 .write("credentialDefaultProvider?: (input: any) => __Provider<__Credentials>;\n");
         writer.writeDocs("The AWS region to which this client will send requests")
@@ -112,15 +112,15 @@ public Map<String, Consumer<TypeScriptWriter>> getRuntimeConfigWriters(
         ServiceShape service = settings.getService(model);
         Map<String, Consumer<TypeScriptWriter>> runtimeConfigs = new HashMap();
         if (target.equals(LanguageTarget.SHARED)) {
-            String signingName = service.getTrait(ServiceTrait.class)
+            String serviceId = service.getTrait(ServiceTrait.class)
                     .map(ServiceTrait::getArnNamespace)
                     .orElse(null);
-            if (signingName != null) {
-                runtimeConfigs.put("signingName", writer -> {
-                    writer.write("signingName: $S,", signingName);
+            if (serviceId != null) {
+                runtimeConfigs.put("serviceId", writer -> {
+                    writer.write("serviceId: $S,", serviceId);
                 });
             } else {
-                LOGGER.info("Cannot generate a signing name for the client because no aws.api#Service "
+                LOGGER.info("Cannot generate a serivce ID for the client because no aws.api#Service "
                         + "trait was found on " + service.getId());
             }
         }
diff --git a/packages/middleware-signing/src/configurations.ts b/packages/middleware-signing/src/configurations.ts
index 5f5c6ad4a9c48..fea72dbbe6f57 100644
--- a/packages/middleware-signing/src/configurations.ts
+++ b/packages/middleware-signing/src/configurations.ts
@@ -32,7 +32,8 @@ interface PreviouslyResolved {
   credentialDefaultProvider: (input: any) => Provider<Credentials>;
   region: string | Provider<string>;
   regionInfoProvider: RegionInfoProvider;
-  signingName: string;
+  signingName?: string;
+  serviceId: string;
   sha256: HashConstructor;
 }
 export interface AwsAuthResolvedConfig {
@@ -55,11 +56,11 @@ export function resolveAwsAuthConfig<T>(input: T & AwsAuthInputConfig & Previous
       normalizeProvider(input.region)()
         .then(async (region) => [(await input.regionInfoProvider(region)) || {}, region] as [RegionInfo, string])
         .then(([regionInfo, region]) => {
-          const { signingRegion = input.signingRegion, signingService = input.signingName } = regionInfo;
+          const { signingRegion, signingService } = regionInfo;
           //update client's singing region and signing service config if they are resolved.
           //signing region resolving order: user supplied signingRegion -> endpoints.json inferred region -> client region
           input.signingRegion = input.signingRegion || signingRegion || region;
-          input.signingName = input.signingName || signingService;
+          input.signingName = input.signingName || signingService || input.serviceId;
 
           return new SignatureV4({
             credentials: normalizedCreds,
diff --git a/protocol_tests/aws-ec2/EC2ProtocolClient.ts b/protocol_tests/aws-ec2/EC2ProtocolClient.ts
index 4c0b424f23aba..64e8b5072bf9d 100644
--- a/protocol_tests/aws-ec2/EC2ProtocolClient.ts
+++ b/protocol_tests/aws-ec2/EC2ProtocolClient.ts
@@ -175,9 +175,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/protocol_tests/aws-ec2/runtimeConfig.shared.ts b/protocol_tests/aws-ec2/runtimeConfig.shared.ts
index 88516b4c67c26..6c471d95e8b00 100644
--- a/protocol_tests/aws-ec2/runtimeConfig.shared.ts
+++ b/protocol_tests/aws-ec2/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "awsec2",
+  serviceId: "awsec2",
 };
diff --git a/protocol_tests/aws-json/JsonProtocolClient.ts b/protocol_tests/aws-json/JsonProtocolClient.ts
index 0845dc0db5c41..d4588a5679b05 100644
--- a/protocol_tests/aws-json/JsonProtocolClient.ts
+++ b/protocol_tests/aws-json/JsonProtocolClient.ts
@@ -130,9 +130,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/protocol_tests/aws-json/runtimeConfig.shared.ts b/protocol_tests/aws-json/runtimeConfig.shared.ts
index dfe62aa5ee662..7371d49e80ed9 100644
--- a/protocol_tests/aws-json/runtimeConfig.shared.ts
+++ b/protocol_tests/aws-json/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "jsonprotocol",
+  serviceId: "jsonprotocol",
 };
diff --git a/protocol_tests/aws-query/QueryProtocolClient.ts b/protocol_tests/aws-query/QueryProtocolClient.ts
index 524e4b5bd914a..6c8e31851115b 100644
--- a/protocol_tests/aws-query/QueryProtocolClient.ts
+++ b/protocol_tests/aws-query/QueryProtocolClient.ts
@@ -196,9 +196,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/protocol_tests/aws-query/runtimeConfig.shared.ts b/protocol_tests/aws-query/runtimeConfig.shared.ts
index c261363f96533..bd5fcd41691dd 100644
--- a/protocol_tests/aws-query/runtimeConfig.shared.ts
+++ b/protocol_tests/aws-query/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "awsquery",
+  serviceId: "awsquery",
 };
diff --git a/protocol_tests/aws-restjson/RestJsonProtocolClient.ts b/protocol_tests/aws-restjson/RestJsonProtocolClient.ts
index 1d2edb3f719f3..8b3795bfc246c 100644
--- a/protocol_tests/aws-restjson/RestJsonProtocolClient.ts
+++ b/protocol_tests/aws-restjson/RestJsonProtocolClient.ts
@@ -250,9 +250,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/protocol_tests/aws-restjson/runtimeConfig.shared.ts b/protocol_tests/aws-restjson/runtimeConfig.shared.ts
index 87e6e2001e493..535a258d2da41 100644
--- a/protocol_tests/aws-restjson/runtimeConfig.shared.ts
+++ b/protocol_tests/aws-restjson/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "restjson",
+  serviceId: "restjson",
 };
diff --git a/protocol_tests/aws-restxml/RestXmlProtocolClient.ts b/protocol_tests/aws-restxml/RestXmlProtocolClient.ts
index 838e64516c900..86898c7710069 100644
--- a/protocol_tests/aws-restxml/RestXmlProtocolClient.ts
+++ b/protocol_tests/aws-restxml/RestXmlProtocolClient.ts
@@ -292,9 +292,10 @@ export interface ClientDefaults extends Partial<__SmithyResolvedConfiguration<__
   disableHostPrefix?: boolean;
 
   /**
-   * The service name with which to sign requests.
+   * Unique service identifier.
+   * @internal
    */
-  signingName?: string;
+  serviceId?: string;
 
   /**
    * Default credentials provider; Not available in browser runtime
diff --git a/protocol_tests/aws-restxml/runtimeConfig.shared.ts b/protocol_tests/aws-restxml/runtimeConfig.shared.ts
index af8cb454f831f..d37f5e7050900 100644
--- a/protocol_tests/aws-restxml/runtimeConfig.shared.ts
+++ b/protocol_tests/aws-restxml/runtimeConfig.shared.ts
@@ -9,5 +9,5 @@ export const ClientSharedValues = {
   disableHostPrefix: false,
   logger: {} as __Logger,
   regionInfoProvider: defaultRegionInfoProvider,
-  signingName: "restxml",
+  serviceId: "restxml",
 };