diff --git a/private/aws-client-api-test/package.json b/private/aws-client-api-test/package.json
index fdde74821286..bb36d0e346e8 100644
--- a/private/aws-client-api-test/package.json
+++ b/private/aws-client-api-test/package.json
@@ -18,7 +18,16 @@
   "module": "./dist-es/index.js",
   "sideEffects": false,
   "dependencies": {
+    "@aws-sdk/client-dynamodb": "*",
+    "@aws-sdk/client-ec2": "*",
+    "@aws-sdk/client-glacier": "*",
+    "@aws-sdk/client-rds": "*",
+    "@aws-sdk/client-route-53": "*",
     "@aws-sdk/client-s3": "*",
+    "@aws-sdk/client-s3-control": "*",
+    "@aws-sdk/client-sqs": "*",
+    "@aws-sdk/client-sts": "*",
+    "@aws-sdk/client-transcribe-streaming": "*",
     "@aws-sdk/credential-provider-node": "*",
     "@aws-sdk/middleware-bucket-endpoint": "*",
     "@aws-sdk/middleware-flexible-checksums": "*",
diff --git a/private/aws-client-api-test/src/client-interface-tests/config/client-config-custody.spec.ts b/private/aws-client-api-test/src/client-interface-tests/config/client-config-custody.spec.ts
new file mode 100644
index 000000000000..996f99ad107d
--- /dev/null
+++ b/private/aws-client-api-test/src/client-interface-tests/config/client-config-custody.spec.ts
@@ -0,0 +1,42 @@
+import { describe, test as it, expect } from "vitest";
+import { S3 } from "@aws-sdk/client-s3";
+import { S3Control } from "@aws-sdk/client-s3-control";
+import { DynamoDB } from "@aws-sdk/client-dynamodb";
+import { EC2 } from "@aws-sdk/client-ec2";
+import { SQS } from "@aws-sdk/client-sqs";
+import { Glacier } from "@aws-sdk/client-glacier";
+import { STS } from "@aws-sdk/client-sts";
+import { TranscribeStreaming } from "@aws-sdk/client-transcribe-streaming";
+import { Route53 } from "@aws-sdk/client-route-53";
+import { RDS } from "@aws-sdk/client-rds";
+
+describe("client config object custody", () => {
+  it("should maintain a consistent object reference throughout the client resolver stack lifecycle (the constructor)", () => {
+    const clients = [
+      new S3(),
+      new S3Control(),
+      new DynamoDB(),
+      new EC2(),
+      new Glacier(),
+      new RDS(),
+      new Route53(),
+      new SQS(),
+      new STS(),
+      new TranscribeStreaming(),
+    ];
+    for (const client of clients) {
+      try {
+        expect(Object.keys(client.config)).toEqual(Object.keys(client.initConfig ?? {}));
+      } catch (e) {
+        throw new Error(`MismatchedObjectKeys - config object custody error for ${client.constructor.name}`);
+      }
+
+      // reference equality assertion
+      try {
+        expect(client.config).toBe(client.initConfig);
+      } catch (e) {
+        throw new Error(`ReferenceEqualityError - config object custody error for ${client.constructor.name}`);
+      }
+    }
+  });
+});
diff --git a/yarn.lock b/yarn.lock
index 9ba23ad57e75..1168ec387866 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -101,7 +101,16 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@aws-sdk/aws-client-api-test@workspace:private/aws-client-api-test"
   dependencies:
+    "@aws-sdk/client-dynamodb": "npm:*"
+    "@aws-sdk/client-ec2": "npm:*"
+    "@aws-sdk/client-glacier": "npm:*"
+    "@aws-sdk/client-rds": "npm:*"
+    "@aws-sdk/client-route-53": "npm:*"
     "@aws-sdk/client-s3": "npm:*"
+    "@aws-sdk/client-s3-control": "npm:*"
+    "@aws-sdk/client-sqs": "npm:*"
+    "@aws-sdk/client-sts": "npm:*"
+    "@aws-sdk/client-transcribe-streaming": "npm:*"
     "@aws-sdk/credential-provider-node": "npm:*"
     "@aws-sdk/middleware-bucket-endpoint": "npm:*"
     "@aws-sdk/middleware-flexible-checksums": "npm:*"
@@ -9462,7 +9471,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@aws-sdk/client-glacier@workspace:clients/client-glacier":
+"@aws-sdk/client-glacier@npm:*, @aws-sdk/client-glacier@workspace:clients/client-glacier":
   version: 0.0.0-use.local
   resolution: "@aws-sdk/client-glacier@workspace:clients/client-glacier"
   dependencies:
@@ -17209,7 +17218,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@aws-sdk/client-rds@workspace:clients/client-rds":
+"@aws-sdk/client-rds@npm:*, @aws-sdk/client-rds@workspace:clients/client-rds":
   version: 0.0.0-use.local
   resolution: "@aws-sdk/client-rds@workspace:clients/client-rds"
   dependencies:
@@ -17957,7 +17966,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@aws-sdk/client-route-53@workspace:clients/client-route-53":
+"@aws-sdk/client-route-53@npm:*, @aws-sdk/client-route-53@workspace:clients/client-route-53":
   version: 0.0.0-use.local
   resolution: "@aws-sdk/client-route-53@workspace:clients/client-route-53"
   dependencies:
@@ -20164,7 +20173,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@aws-sdk/client-sqs@workspace:clients/client-sqs":
+"@aws-sdk/client-sqs@npm:*, @aws-sdk/client-sqs@workspace:clients/client-sqs":
   version: 0.0.0-use.local
   resolution: "@aws-sdk/client-sqs@workspace:clients/client-sqs"
   dependencies:
@@ -20695,7 +20704,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@aws-sdk/client-sts@workspace:clients/client-sts":
+"@aws-sdk/client-sts@npm:*, @aws-sdk/client-sts@workspace:clients/client-sts":
   version: 0.0.0-use.local
   resolution: "@aws-sdk/client-sts@workspace:clients/client-sts"
   dependencies:
@@ -21330,7 +21339,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@aws-sdk/client-transcribe-streaming@workspace:clients/client-transcribe-streaming":
+"@aws-sdk/client-transcribe-streaming@npm:*, @aws-sdk/client-transcribe-streaming@workspace:clients/client-transcribe-streaming":
   version: 0.0.0-use.local
   resolution: "@aws-sdk/client-transcribe-streaming@workspace:clients/client-transcribe-streaming"
   dependencies: