diff --git a/packages/http-client-csharp/emitter/src/lib/client-converter.ts b/packages/http-client-csharp/emitter/src/lib/client-converter.ts
index 5db150751f8..ff75e604ce2 100644
--- a/packages/http-client-csharp/emitter/src/lib/client-converter.ts
+++ b/packages/http-client-csharp/emitter/src/lib/client-converter.ts
@@ -24,7 +24,7 @@ import {
   getParameterDefaultValue,
 } from "./operation-converter.js";
 import { fromSdkType } from "./type-converter.js";
-import { isReadOnly } from "./utils.js";
+import { isMultiServiceClient, isReadOnly } from "./utils.js";
 
 type SdkClientType = SdkClientTypeOfT<SdkHttpOperation>;
 
@@ -79,6 +79,7 @@ function fromSdkClient(
     apiVersions: client.apiVersions,
     parent: undefined,
     children: undefined,
+    isMultiServiceClient: isMultiServiceClient(client),
   };
 
   sdkContext.__typeCache.updateSdkClientReferences(client, inputClient);
diff --git a/packages/http-client-csharp/emitter/src/lib/client-model-builder.ts b/packages/http-client-csharp/emitter/src/lib/client-model-builder.ts
index abfd0fefb05..203a5995a2a 100644
--- a/packages/http-client-csharp/emitter/src/lib/client-model-builder.ts
+++ b/packages/http-client-csharp/emitter/src/lib/client-model-builder.ts
@@ -1,7 +1,12 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License. See License.txt in the project root for license information.
 
-import { UsageFlags } from "@azure-tools/typespec-client-generator-core";
+import {
+  SdkClientType,
+  SdkEnumType,
+  SdkHttpOperation,
+  UsageFlags,
+} from "@azure-tools/typespec-client-generator-core";
 import { CSharpEmitterContext } from "../sdk-context.js";
 import { CodeModel } from "../type/code-model.js";
 import { InputEnumType, InputLiteralType, InputModelType } from "../type/input-type.js";
@@ -9,7 +14,11 @@ import { fromSdkClients } from "./client-converter.js";
 import { fromSdkNamespaces } from "./namespace-converter.js";
 import { processServiceAuthentication } from "./service-authentication.js";
 import { fromSdkType } from "./type-converter.js";
-import { firstLetterToUpperCase, getClientNamespaceString } from "./utils.js";
+import {
+  containsMultiServiceClient,
+  firstLetterToUpperCase,
+  getClientNamespaceString,
+} from "./utils.js";
 
 /**
  * Creates the code model from the SDK context.
@@ -31,13 +40,8 @@ export function createModel(sdkContext: CSharpEmitterContext): CodeModel {
     types.filter((type) => type.kind === "enum") as InputEnumType[],
   ];
 
-  const sdkApiVersionEnums = sdkPackage.enums.filter((e) => e.usage === UsageFlags.ApiVersionEnum);
   const rootClients = sdkPackage.clients;
-  const rootApiVersions =
-    sdkApiVersionEnums.length > 0
-      ? sdkApiVersionEnums[0].values.map((v) => v.value as string).flat()
-      : (rootClients[0]?.apiVersions ?? []);
-
+  const rootApiVersions = parseApiVersions(sdkPackage.enums, rootClients);
   const inputClients = fromSdkClients(sdkContext, rootClients, rootApiVersions);
 
   // TODO -- TCGC now does not have constants field in its sdkPackage, they might add it in the future.
@@ -61,6 +65,30 @@ export function createModel(sdkContext: CSharpEmitterContext): CodeModel {
   return clientModel;
 }
 
+/**
+ * Parses and returns the correct API versions for the library.
+ * Handles both regular and multiservice client libraries.
+ *
+ * @param enums - Array of enums from the SDK package
+ * @param rootClients - Array of root clients from the SDK package
+ * @returns Array of API version strings
+ */
+function parseApiVersions(
+  enums: SdkEnumType[],
+  rootClients: SdkClientType<SdkHttpOperation>[],
+): string[] {
+  if (containsMultiServiceClient(rootClients)) {
+    return rootClients[0]?.apiVersions ?? [];
+  }
+
+  const apiVersionEnum = enums.find((e) => (e.usage & UsageFlags.ApiVersionEnum) !== 0);
+  if (apiVersionEnum) {
+    return apiVersionEnum.values.map((v) => v.value as string);
+  }
+
+  return rootClients[0]?.apiVersions ?? [];
+}
+
 /**
  * Fixes naming conflicts for constants, enums, and models.
  *
diff --git a/packages/http-client-csharp/emitter/src/lib/utils.ts b/packages/http-client-csharp/emitter/src/lib/utils.ts
index 54edf8a4f84..93001017bea 100644
--- a/packages/http-client-csharp/emitter/src/lib/utils.ts
+++ b/packages/http-client-csharp/emitter/src/lib/utils.ts
@@ -1,5 +1,7 @@
 import {
   listAllServiceNamespaces,
+  SdkClientType,
+  SdkHttpOperation,
   SdkHttpParameter,
   SdkMethodParameter,
   SdkModelPropertyType,
@@ -139,10 +141,19 @@ export async function execAsync(
 }
 
 export function getClientNamespaceString(context: CSharpEmitterContext): string | undefined {
-  return getClientNamespaceStringHelper(
-    context.emitContext.options["package-name"],
-    listAllServiceNamespaces(context)[0],
-  );
+  const packageName = context.emitContext.options["package-name"];
+  const serviceNamespaces = listAllServiceNamespaces(context);
+  const firstNamespace = serviceNamespaces.length > 0 ? serviceNamespaces[0] : undefined;
+
+  if (packageName) {
+    return getClientNamespaceStringHelper(packageName, firstNamespace);
+  }
+
+  if (containsMultiServiceClient(context.sdkPackage.clients)) {
+    return getClientNamespaceStringHelper(context.sdkPackage.clients[0].namespace);
+  }
+
+  return getClientNamespaceStringHelper(undefined, firstNamespace);
 }
 
 export function getClientNamespaceStringHelper(
@@ -186,3 +197,33 @@ export function isReadOnly(
     return false;
   }
 }
+
+/**
+ * Determines if the library contains a multiservice client.
+ *
+ * @param rootClients - Array of root clients from the SDK package
+ * @returns True if this is a multiservice client library, false otherwise
+ * @beta
+ */
+export function containsMultiServiceClient(
+  rootClients: SdkClientType<SdkHttpOperation>[],
+): boolean {
+  if (rootClients.length === 0) {
+    return false;
+  }
+
+  return isMultiServiceClient(rootClients[0]);
+}
+
+/**
+ * Determines if a client is a multiservice client.
+ * A multiservice client is one where the underlying service is an array of services
+ * with more than one element.
+ *
+ * @param client - The SDK client to check
+ * @returns True if this is a multiservice client, false otherwise
+ * @beta
+ */
+export function isMultiServiceClient(client: SdkClientType<SdkHttpOperation>): boolean {
+  return Array.isArray(client.__raw.service) && client.__raw.service.length > 1;
+}
diff --git a/packages/http-client-csharp/emitter/src/type/input-type.ts b/packages/http-client-csharp/emitter/src/type/input-type.ts
index 628aad29e37..b4008677dd8 100644
--- a/packages/http-client-csharp/emitter/src/type/input-type.ts
+++ b/packages/http-client-csharp/emitter/src/type/input-type.ts
@@ -43,6 +43,7 @@ export interface InputClient extends DecoratedType {
   crossLanguageDefinitionId: string;
   parent?: InputClient;
   children?: InputClient[];
+  isMultiServiceClient: boolean;
 }
 
 /**
diff --git a/packages/http-client-csharp/emitter/test/Unit/client-converter.test.ts b/packages/http-client-csharp/emitter/test/Unit/client-converter.test.ts
new file mode 100644
index 00000000000..ab683388071
--- /dev/null
+++ b/packages/http-client-csharp/emitter/test/Unit/client-converter.test.ts
@@ -0,0 +1,253 @@
+vi.resetModules();
+
+import { TestHost } from "@typespec/compiler/testing";
+import { ok, strictEqual } from "assert";
+import { beforeEach, describe, it, vi } from "vitest";
+import { createModel } from "../../src/lib/client-model-builder.js";
+import {
+  createCSharpSdkContext,
+  createEmitterContext,
+  createEmitterTestHost,
+  typeSpecCompile,
+} from "./utils/test-util.js";
+
+describe("isMultiServiceClient", () => {
+  let runner: TestHost;
+
+  beforeEach(async () => {
+    runner = await createEmitterTestHost();
+  });
+
+  it("should be false for single service client", async () => {
+    const program = await typeSpecCompile(
+      `
+        @route("/test")
+        op test(): void;
+      `,
+      runner,
+    );
+    const context = createEmitterContext(program);
+    const sdkContext = await createCSharpSdkContext(context);
+    const root = createModel(sdkContext);
+
+    const client = root.clients[0];
+    ok(client, "Client should exist");
+    strictEqual(
+      client.isMultiServiceClient,
+      false,
+      "Single service client should not be multiservice",
+    );
+  });
+
+  it("should be true for multiservice client combining multiple services using subclients", async () => {
+    const program = await typeSpecCompile(
+      `
+        @versioned(VersionsA)
+        namespace ServiceA {
+          enum VersionsA {
+            av1,
+          }
+          
+          @route("/a")
+          interface AI {
+            @route("test")
+            op aTest(): void;
+          }
+        }
+        
+        @versioned(VersionsB)
+        namespace ServiceB {
+          enum VersionsB {
+            bv1,
+            bv2,
+          }
+          
+          @route("/b")
+          interface BI {
+            @route("test")
+            op bTest(): void;
+          }
+        }
+        
+        @client({
+          name: "CombinedClient",
+          service: [ServiceA, ServiceB],
+        })
+        @useDependency(ServiceA.VersionsA.av1, ServiceB.VersionsB.bv2)
+        namespace Service.MultiService {}
+      `,
+      runner,
+      { IsNamespaceNeeded: false, IsTCGCNeeded: true },
+    );
+    const context = createEmitterContext(program);
+    const sdkContext = await createCSharpSdkContext(context);
+    const root = createModel(sdkContext);
+    strictEqual(root.name, "Service.MultiService", "Root namespace should be Service.MultiService");
+
+    const client = root.clients[0];
+    ok(client, "Client should exist");
+    strictEqual(client.name, "CombinedClient", "Client should be named CombinedClient");
+    strictEqual(
+      client.namespace,
+      "Service.MultiService",
+      "Client namespace should be Service.MultiService",
+    );
+    strictEqual(
+      client.isMultiServiceClient,
+      true,
+      "Multi-service client should have isMultiServiceClient=true",
+    );
+
+    // Verify sub-clients are NOT multiservice clients
+    ok(client.children, "Client should have children");
+    ok(client.children.length > 0, "Client should have at least one child");
+    for (const childClient of client.children) {
+      strictEqual(
+        childClient.isMultiServiceClient,
+        false,
+        `Child client '${childClient.name}' should not be a multiservice client`,
+      );
+    }
+  });
+
+  it("should be true for multiservice root client", async () => {
+    const program = await typeSpecCompile(
+      `
+        @versioned(VersionsA)
+        namespace ServiceA {
+          enum VersionsA {
+            av1,
+          }
+          
+
+          @route("/test")
+          op testOne(@query("api-version") apiVersion: VersionsA): void;
+        }
+        
+        @versioned(VersionsB)
+        namespace ServiceB {
+          enum VersionsB {
+            bv1,
+            bv2,
+          }
+          
+          @route("/test")
+          op testTwo(@query("api-version") apiVersion: VersionsB): void;
+        }
+        
+        @client({
+          name: "CombinedClient",
+          service: [ServiceA, ServiceB],
+        })
+
+        namespace Service.MultiService {}
+      `,
+      runner,
+      { IsNamespaceNeeded: false, IsTCGCNeeded: true },
+    );
+    const context = createEmitterContext(program);
+    const sdkContext = await createCSharpSdkContext(context);
+    const root = createModel(sdkContext);
+    strictEqual(root.name, "Service.MultiService", "Root namespace should be Service.MultiService");
+
+    const client = root.clients[0];
+    ok(client, "Client should exist");
+    strictEqual(client.name, "CombinedClient", "Client should be named CombinedClient");
+    strictEqual(
+      client.namespace,
+      "Service.MultiService",
+      "Client namespace should be Service.MultiService",
+    );
+    strictEqual(
+      client.isMultiServiceClient,
+      true,
+      "Multi-service client should have isMultiServiceClient=true",
+    );
+
+    ok(!client.children || client.children.length === 0, "Client should not have any children");
+  });
+
+  it("should be true for multiservice mixed clients", async () => {
+    const program = await typeSpecCompile(
+      `
+        @versioned(VersionsA)
+        namespace ServiceA {
+          enum VersionsA {
+            av1,
+            av2,
+          }
+
+          @route("/test")
+          op testA(@query("api-version") apiVersion: VersionsA): void;
+
+          @route("foo")
+          interface Foo {
+            @route("/test")
+            testB(@query("api-version") apiVersion: VersionsA): void;
+          }
+        }
+
+        /**
+         * Second service definition in a multi-service package with versioning
+         */
+        @versioned(VersionsB)
+        namespace ServiceB {
+          enum VersionsB {
+            bv1,
+            bv2,
+          }
+
+          @route("/test")
+          op testC(@query("api-version") apiVersion: VersionsB): void;
+
+          @route("bar")
+          interface Bar {
+            @route("/test")
+            testD(@query("api-version") apiVersion: VersionsB): void;
+          }
+        }
+        
+        @client({
+          name: "CombinedClient",
+          service: [ServiceA, ServiceB],
+        })
+
+        namespace Service.MultiService {}
+      `,
+      runner,
+      { IsNamespaceNeeded: false, IsTCGCNeeded: true },
+    );
+    const context = createEmitterContext(program);
+    const sdkContext = await createCSharpSdkContext(context);
+    const root = createModel(sdkContext);
+    strictEqual(root.name, "Service.MultiService", "Root namespace should be Service.MultiService");
+
+    const clients = root.clients;
+    strictEqual(clients.length, 1, "There should be one root client");
+
+    const client = root.clients[0];
+    ok(client, "Client should exist");
+    strictEqual(client.name, "CombinedClient", "Client should be named CombinedClient");
+    strictEqual(
+      client.namespace,
+      "Service.MultiService",
+      "Client namespace should be Service.MultiService",
+    );
+    strictEqual(
+      client.isMultiServiceClient,
+      true,
+      "Multi-service client should have isMultiServiceClient=true",
+    );
+
+    // Verify sub-clients are NOT multiservice clients
+    ok(client.children, "Client should have children");
+    ok(client.children.length > 0, "Client should have at least one child");
+    for (const childClient of client.children) {
+      strictEqual(
+        childClient.isMultiServiceClient,
+        false,
+        `Child client '${childClient.name}' should not be a multiservice client`,
+      );
+    }
+  });
+});
diff --git a/packages/http-client-csharp/emitter/test/Unit/client-model-builder.test.ts b/packages/http-client-csharp/emitter/test/Unit/client-model-builder.test.ts
index 8207603f30b..611fafc9ec9 100644
--- a/packages/http-client-csharp/emitter/test/Unit/client-model-builder.test.ts
+++ b/packages/http-client-csharp/emitter/test/Unit/client-model-builder.test.ts
@@ -176,3 +176,268 @@ describe("fixNamingConflicts", () => {
     );
   });
 });
+
+describe("parseApiVersions", () => {
+  let runner: TestHost;
+
+  beforeEach(async () => {
+    runner = await createEmitterTestHost();
+  });
+
+  it("should pick up apiVersion enum used as input parameter in root apiVersions", async () => {
+    const program = await typeSpecCompile(
+      `
+        @route("/test")
+        op test(@query apiVersion: Versions): void;
+      `,
+      runner,
+    );
+    const context = createEmitterContext(program);
+    const sdkContext = await createCSharpSdkContext(context);
+    const root = createModel(sdkContext);
+
+    // The root apiVersions should include the version from the Versions enum
+    // which is defined in the default namespace with version "2023-01-01-preview"
+    ok(root.apiVersions.length > 0, "Root apiVersions should not be empty");
+    ok(
+      root.apiVersions.includes("2023-01-01-preview"),
+      "Root apiVersions should include the version from the Versions enum",
+    );
+  });
+
+  it("should pick up apiVersion enum with multiple versions in root apiVersions", async () => {
+    const program = await typeSpecCompile(
+      `
+        @service(#{
+          title: "Test Service",
+        })
+        @versioned(TestVersions)
+        namespace TestService;
+        
+        enum TestVersions {
+          v1: "2023-01-01",
+          v2: "2023-06-01",
+          v3: "2024-01-01",
+        }
+        
+        @route("/test")
+        op test(@query apiVersion: TestVersions): void;
+      `,
+      runner,
+      { IsNamespaceNeeded: false },
+    );
+    const context = createEmitterContext(program);
+    const sdkContext = await createCSharpSdkContext(context);
+    const root = createModel(sdkContext);
+
+    // The root apiVersions should include all versions from the TestVersions enum
+    strictEqual(root.apiVersions.length, 3, "Root apiVersions should have 3 versions");
+    ok(root.apiVersions.includes("2023-01-01"), "Root apiVersions should include 2023-01-01");
+    ok(root.apiVersions.includes("2023-06-01"), "Root apiVersions should include 2023-06-01");
+    ok(root.apiVersions.includes("2024-01-01"), "Root apiVersions should include 2024-01-01");
+  });
+
+  it("should have apiVersions for single service client", async () => {
+    const program = await typeSpecCompile(
+      `
+        @route("/test")
+        op test(): void;
+      `,
+      runner,
+    );
+    const context = createEmitterContext(program);
+    const sdkContext = await createCSharpSdkContext(context);
+    const root = createModel(sdkContext);
+
+    // Single service client should have apiVersions from the @versioned decorator
+    ok(root.apiVersions.length > 0, "Root apiVersions should not be empty for single service");
+    ok(
+      root.apiVersions.includes("2023-01-01-preview"),
+      "Root apiVersions should include the service version",
+    );
+  });
+
+  it("should have apiVersions for multiservice client combining multiple services using subclients", async () => {
+    const program = await typeSpecCompile(
+      `
+        @versioned(VersionsA)
+        namespace ServiceA {
+          enum VersionsA {
+            av1,
+          }
+          
+          @route("/a")
+          interface AI {
+            @route("test")
+            op aTest(): void;
+          }
+        }
+        
+        @versioned(VersionsB)
+        namespace ServiceB {
+          enum VersionsB {
+            bv1,
+            bv2,
+          }
+          
+          @route("/b")
+          interface BI {
+            @route("test")
+            op bTest(): void;
+          }
+        }
+        
+        @client({
+          name: "CombinedClient",
+          service: [ServiceA, ServiceB],
+        })
+        @useDependency(ServiceA.VersionsA.av1, ServiceB.VersionsB.bv2)
+        namespace Service.MultiService {}
+      `,
+      runner,
+      { IsNamespaceNeeded: false, IsTCGCNeeded: true },
+    );
+    const context = createEmitterContext(program);
+    const sdkContext = await createCSharpSdkContext(context);
+    const root = createModel(sdkContext);
+
+    ok(root.apiVersions.length === 0, "Root apiVersions should be empty for multiservice");
+
+    // each child client should have its own apiVersions
+    const client = root.clients[0];
+    ok(client, "Client should exist");
+    ok(client.children, "Client should have children");
+    ok(client.children.length > 0, "Client should have at least one child");
+
+    const serviceAClient = client.children.find((c) => c.name === "AI");
+    ok(serviceAClient, "ServiceA client should exist");
+    strictEqual(serviceAClient.apiVersions.length, 1, "ServiceA client should have 1 apiVersion");
+    ok(serviceAClient.apiVersions.includes("av1"), "ServiceA client should include av1");
+
+    const serviceBClient = client.children.find((c) => c.name === "BI");
+    ok(serviceBClient, "ServiceB client should exist");
+    strictEqual(serviceBClient.apiVersions.length, 2, "ServiceB client should have 2 apiVersions");
+    ok(serviceBClient.apiVersions.includes("bv1"), "ServiceB client should include bv1");
+    ok(serviceBClient.apiVersions.includes("bv2"), "ServiceB client should include bv2");
+  });
+
+  it("should have apiVersions for multiservice root client", async () => {
+    const program = await typeSpecCompile(
+      `
+        @versioned(VersionsA)
+        namespace ServiceA {
+          enum VersionsA {
+            av1,
+          }
+          
+
+          @route("/test")
+          op testOne(@query("api-version") apiVersion: VersionsA): void;
+        }
+        
+        @versioned(VersionsB)
+        namespace ServiceB {
+          enum VersionsB {
+            bv1,
+            bv2,
+          }
+          
+          @route("/test")
+          op testTwo(@query("api-version") apiVersion: VersionsB): void;
+        }
+        
+        @client({
+          name: "CombinedClient",
+          service: [ServiceA, ServiceB],
+        })
+
+        namespace Service.MultiService {}
+      `,
+      runner,
+      { IsNamespaceNeeded: false, IsTCGCNeeded: true },
+    );
+    const context = createEmitterContext(program);
+    const sdkContext = await createCSharpSdkContext(context);
+    const root = createModel(sdkContext);
+
+    ok(root.apiVersions.length === 0, "Root apiVersions should be empty for multiservice");
+  });
+
+  it("should have apiVersions for multiservice mixed clients", async () => {
+    const program = await typeSpecCompile(
+      `
+        @versioned(VersionsA)
+        namespace ServiceA {
+          enum VersionsA {
+            av1,
+            av2,
+          }
+
+          @route("/test")
+          op testA(@query("api-version") apiVersion: VersionsA): void;
+
+          @route("foo")
+          interface Foo {
+            @route("/test")
+            testB(@query("api-version") apiVersion: VersionsA): void;
+          }
+        }
+
+        /**
+         * Second service definition in a multi-service package with versioning
+         */
+        @versioned(VersionsB)
+        namespace ServiceB {
+          enum VersionsB {
+            bv1,
+            bv2,
+          }
+
+          @route("/test")
+          op testC(@query("api-version") apiVersion: VersionsB): void;
+
+          @route("bar")
+          interface Bar {
+            @route("/test")
+            testD(@query("api-version") apiVersion: VersionsB): void;
+          }
+        }
+        
+        @client({
+          name: "CombinedClient",
+          service: [ServiceA, ServiceB],
+        })
+
+        namespace Service.MultiService {}
+      `,
+      runner,
+      { IsNamespaceNeeded: false, IsTCGCNeeded: true },
+    );
+    const context = createEmitterContext(program);
+    const sdkContext = await createCSharpSdkContext(context);
+    const root = createModel(sdkContext);
+
+    ok(
+      root.apiVersions.length === 0,
+      "Root apiVersions should not be empty for multiservice mixed clients",
+    );
+
+    // each child client should have its own apiVersions
+    const client = root.clients[0];
+    ok(client, "Client should exist");
+    ok(client.children, "Client should have children");
+    ok(client.children.length > 0, "Client should have at least one child");
+
+    const fooClient = client.children.find((c) => c.name === "Foo");
+    ok(fooClient, "Foo client should exist");
+    strictEqual(fooClient.apiVersions.length, 2, "Foo client should have 2 apiVersions");
+    ok(fooClient.apiVersions.includes("av1"), "Foo client should include av1");
+    ok(fooClient.apiVersions.includes("av2"), "Foo client should include av2");
+
+    const barClient = client.children.find((c) => c.name === "Bar");
+    ok(barClient, "Bar client should exist");
+    strictEqual(barClient.apiVersions.length, 2, "Bar client should have 2 apiVersions");
+    ok(barClient.apiVersions.includes("bv1"), "Bar client should include bv1");
+    ok(barClient.apiVersions.includes("bv2"), "Bar client should include bv2");
+  });
+});
diff --git a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/ClientProviders/ClientProviderSubClientTests.cs b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/ClientProviders/ClientProviderSubClientTests.cs
index d973be30e0a..6de8507f420 100644
--- a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/ClientProviders/ClientProviderSubClientTests.cs
+++ b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/ClientProviders/ClientProviderSubClientTests.cs
@@ -71,7 +71,7 @@ public void SubClientWithMultipleSubClients()
         public void SubClientSummaryIsPopulatedWithDefaultDocs()
         {
             var mockGenerator = MockHelpers.LoadMockGenerator(
-                clients: () => [new InputClient("test", @namespace: "test", string.Empty, null, null, [], [], InputFactory.Client("parentClient"), null, null)]);
+                clients: () => [new InputClient("test", @namespace: "test", string.Empty, null, null, false, [], [], InputFactory.Client("parentClient"), null, null)]);
 
             var client = mockGenerator.Object.OutputLibrary.TypeProviders.OfType<ClientProvider>().SingleOrDefault();
             Assert.IsNotNull(client);
diff --git a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/ClientProviders/ClientProviderTests.cs b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/ClientProviders/ClientProviderTests.cs
index aae9cb41c92..a2b1caf8ed1 100644
--- a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/ClientProviders/ClientProviderTests.cs
+++ b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/ClientProviders/ClientProviderTests.cs
@@ -197,7 +197,7 @@ public void TestBuildAuthFields_WithAuth(List<InputParameter> inputParameters)
         [TestCaseSource(nameof(BuildOAuth2FlowsFieldTestCases))]
         public void TestBuildOAuth2FlowsField(IEnumerable<InputOAuth2Flow> inputFlows)
         {
-            var oauth2Auth = new InputOAuth2Auth([ ..inputFlows]);
+            var oauth2Auth = new InputOAuth2Auth([.. inputFlows]);
             Func<InputAuth>? inputAuth = () => new InputAuth(null, oauth2Auth);
             MockHelpers.LoadMockGenerator(auth: inputAuth);
 
@@ -1287,7 +1287,7 @@ public void ClientProviderSummaryIsPopulated()
         public void ClientProviderSummaryIsPopulatedWithDefaultDocs()
         {
             var mockGenerator = MockHelpers.LoadMockGenerator(
-                clients: () => [new InputClient("testClient", @namespace: "test", string.Empty, null, null, [], [], null, null, null)]);
+                clients: () => [new InputClient("testClient", @namespace: "test", string.Empty, null, null, false, [], [], null, null, null)]);
 
             var client = mockGenerator.Object.OutputLibrary.TypeProviders.OfType<ClientProvider>().SingleOrDefault();
             Assert.IsNotNull(client);
@@ -2759,7 +2759,7 @@ public void ServerTemplateWithBasePathOnly_DoesNotDuplicateBasePath()
             // - operation.Uri = "{endpoint}/contentsafety" (same as server template, no additional segments)
             // - operation.Path = "/text:analyze" (actual operation path)
             // Expected: Should append both the base path from server template and the operation path
-            
+
             MockHelpers.LoadMockGenerator();
 
             var serverTemplate = "{endpoint}/contentsafety";
@@ -2783,7 +2783,7 @@ public void ServerTemplateWithBasePathOnly_DoesNotDuplicateBasePath()
             var fullText = string.Join("\n", bodyText);
 
             var contentsafetyCount = System.Text.RegularExpressions.Regex.Matches(fullText, "contentsafety", System.Text.RegularExpressions.RegexOptions.IgnoreCase).Count;
-        
+
             var analyzeTextCount = System.Text.RegularExpressions.Regex.Matches(fullText, "text:analyze", System.Text.RegularExpressions.RegexOptions.IgnoreCase).Count;
 
             Assert.AreEqual(1, contentsafetyCount, "Should append /contentsafety path segment from Uri (after endpoint)");
@@ -2798,7 +2798,7 @@ public void ServerTemplateWithPathParameter_OnlyAppendsSegmentsAfterEndpoint()
             // - operation.Uri = "{endpoint}/{apiVersion}" (path parameter in Uri)
             // - operation.Path = "/users/{userId}" (actual operation path with its own parameter)
             // Expected: Should append apiVersion parameter and then the operation path
-            
+
             MockHelpers.LoadMockGenerator();
 
             var serverTemplate = "{endpoint}/{apiVersion}";
@@ -2825,12 +2825,12 @@ public void ServerTemplateWithPathParameter_OnlyAppendsSegmentsAfterEndpoint()
             var bodyText = methodBody.Select(s => s.ToDisplayString()).ToArray();
             var fullText = string.Join("\n", bodyText);
 
-            Assert.IsTrue(fullText.Contains("AppendPath(") && fullText.Contains("apiVersion"), 
+            Assert.IsTrue(fullText.Contains("AppendPath(") && fullText.Contains("apiVersion"),
                 "Should append apiVersion path parameter from Uri");
-            
-            Assert.IsTrue(fullText.Contains("/users/"), 
+
+            Assert.IsTrue(fullText.Contains("/users/"),
                 "Should append the operation path /users/");
-            Assert.IsTrue(fullText.Contains("userId"), 
+            Assert.IsTrue(fullText.Contains("userId"),
                 "Should append userId path parameter from operation path");
         }
 
@@ -2842,7 +2842,7 @@ public void ServerTemplateWithMultipleSegments_HandlesCorrectly()
             // - operation.Uri = "{endpoint}/v1/services" (multiple static segments after endpoint)
             // - operation.Path = "/operations/{operationId}"
             // Expected: Should append /v1/services and then the operation path
-            
+
             MockHelpers.LoadMockGenerator();
 
             var serverTemplate = "{endpoint}/v1/services";
@@ -2869,12 +2869,12 @@ public void ServerTemplateWithMultipleSegments_HandlesCorrectly()
             var fullText = string.Join("\n", bodyText);
 
             // Should append /v1/services from Uri
-            Assert.IsTrue(fullText.Contains("/v1/services"), 
+            Assert.IsTrue(fullText.Contains("/v1/services"),
                 "Should append server template path segments /v1/services");
-            
-            Assert.IsTrue(fullText.Contains("/operations/"), 
+
+            Assert.IsTrue(fullText.Contains("/operations/"),
                 "Should append the operation path /operations/");
-            Assert.IsTrue(fullText.Contains("operationId"), 
+            Assert.IsTrue(fullText.Contains("operationId"),
                 "Should append operationId path parameter");
         }
 
@@ -2886,7 +2886,7 @@ public void ServerTemplateEqualsEndpoint_OnlyAppendsOperationPath()
             // - operation.Uri = "{endpoint}" (same as server template)
             // - operation.Path = "/items"
             // Expected: Should only append the operation path
-            
+
             MockHelpers.LoadMockGenerator();
 
             var serverTemplate = "{endpoint}";
@@ -2910,10 +2910,10 @@ public void ServerTemplateEqualsEndpoint_OnlyAppendsOperationPath()
             var fullText = string.Join("\n", bodyText);
 
             var appendPathCount = System.Text.RegularExpressions.Regex.Matches(fullText, "AppendPath\\(").Count;
-            
-            Assert.GreaterOrEqual(appendPathCount, 1, 
+
+            Assert.GreaterOrEqual(appendPathCount, 1,
                 "Should have at least one AppendPath call for the operation path");
-            Assert.IsTrue(fullText.Contains("/items"), 
+            Assert.IsTrue(fullText.Contains("/items"),
                 "Should append the operation path /items");
         }
     }
diff --git a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/src/InputTypes/InputClient.cs b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/src/InputTypes/InputClient.cs
index a013c13f8ba..ca001c8a192 100644
--- a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/src/InputTypes/InputClient.cs
+++ b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/src/InputTypes/InputClient.cs
@@ -16,6 +16,7 @@ public InputClient(
             string crossLanguageDefinitionId,
             string? summary,
             string? doc,
+            bool isMultiServiceClient,
             IReadOnlyList<InputServiceMethod> methods,
             IReadOnlyList<InputParameter> parameters,
             InputClient? parent,
@@ -34,13 +35,14 @@ public InputClient(
             ApiVersions = apiVersions ?? [];
         }
 
-        public InputClient() : this(string.Empty, string.Empty, string.Empty, string.Empty, string.Empty, Array.Empty<InputServiceMethod>(), Array.Empty<InputParameter>(), null, null, null) { }
+        public InputClient() : this(string.Empty, string.Empty, string.Empty, string.Empty, string.Empty, false, Array.Empty<InputServiceMethod>(), Array.Empty<InputParameter>(), null, null, null) { }
 
         public string Name { get; internal set; }
         public string Namespace { get; internal set; }
         public string CrossLanguageDefinitionId { get; internal set; }
         public string? Summary { get; internal set; }
         public string? Doc { get; internal set; }
+        public bool IsMultiServiceClient { get; internal set; }
         public IReadOnlyList<InputServiceMethod> Methods { get; internal set; }
         public IReadOnlyList<InputParameter> Parameters { get; internal set; }
         public InputClientInitializedBy InitializedBy { get; internal set; }
@@ -74,6 +76,7 @@ public void Update(
             string? crossLanguageDefinitionId = null,
             string? summary = null,
             string? doc = null,
+            bool? isMultiServiceClient = null,
             IEnumerable<InputServiceMethod>? methods = null,
             IEnumerable<InputParameter>? parameters = null,
             InputClient? parent = null,
@@ -105,6 +108,11 @@ public void Update(
                 Doc = doc;
             }
 
+            if (isMultiServiceClient != null)
+            {
+                IsMultiServiceClient = isMultiServiceClient.Value;
+            }
+
             if (methods != null)
             {
                 Methods = [.. methods];
diff --git a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/src/InputTypes/Serialization/InputClientConverter.cs b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/src/InputTypes/Serialization/InputClientConverter.cs
index b3824f68998..54e10bf1cb2 100644
--- a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/src/InputTypes/Serialization/InputClientConverter.cs
+++ b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/src/InputTypes/Serialization/InputClientConverter.cs
@@ -38,6 +38,7 @@ public override void Write(Utf8JsonWriter writer, InputClient value, JsonSeriali
             string? @namespace = null;
             string? summary = null;
             string? doc = null;
+            bool isMultiServiceClient = false;
             IReadOnlyList<InputServiceMethod>? methods = null;
             IReadOnlyList<InputParameter>? parameters = null;
             int initializedByValue = 0;
@@ -53,6 +54,7 @@ public override void Write(Utf8JsonWriter writer, InputClient value, JsonSeriali
                     || reader.TryReadString("namespace", ref @namespace)
                     || reader.TryReadString("summary", ref summary)
                     || reader.TryReadString("doc", ref doc)
+                    || reader.TryReadBoolean("isMultiServiceClient", ref isMultiServiceClient)
                     || reader.TryReadComplexType("methods", options, ref methods)
                     || reader.TryReadComplexType("parameters", options, ref parameters)
                     || reader.TryReadInt32("initializedBy", ref initializedByValue)
@@ -73,6 +75,7 @@ public override void Write(Utf8JsonWriter writer, InputClient value, JsonSeriali
             client.CrossLanguageDefinitionId = crossLanguageDefinitionId ?? string.Empty;
             client.Summary = summary;
             client.Doc = doc;
+            client.IsMultiServiceClient = isMultiServiceClient;
             client.Methods = methods ?? [];
             client.Parameters = parameters ?? [];
             client.InitializedBy = (InputClientInitializedBy)initializedByValue;
diff --git a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/test/InputClientApiVersionsTests.cs b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/test/InputClientApiVersionsTests.cs
index 8e2d809f8a4..509732d52f2 100644
--- a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/test/InputClientApiVersionsTests.cs
+++ b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/test/InputClientApiVersionsTests.cs
@@ -14,10 +14,11 @@ public void InputClient_ApiVersions_PropertyExists()
             // Act
             var client = new InputClient(
                 "TestClient",
-                "TestNamespace", 
+                "TestNamespace",
                 "TestNamespace.TestClient",
                 "Test summary",
                 "Test documentation",
+                false,
                 [],
                 [],
                 null,
@@ -37,10 +38,11 @@ public void InputClient_ApiVersions_DefaultEmpty()
             // Act
             var client = new InputClient(
                 "TestClient",
-                "TestNamespace", 
+                "TestNamespace",
                 "TestNamespace.TestClient",
                 "Test summary",
                 "Test documentation",
+                false,
                 [],
                 [],
                 null,
@@ -58,10 +60,11 @@ public void InputClient_ApiVersions_EmptyCollection()
             // Act
             var client = new InputClient(
                 "TestClient",
-                "TestNamespace", 
+                "TestNamespace",
                 "TestNamespace.TestClient",
                 "Test summary",
                 "Test documentation",
+                false,
                 [],
                 [],
                 null,
@@ -82,10 +85,11 @@ public void InputClient_Constructor_SetsApiVersions()
             // Act
             var client = new InputClient(
                 "TestClient",
-                "TestNamespace", 
+                "TestNamespace",
                 "TestNamespace.TestClient",
                 "Test summary",
                 "Test documentation",
+                false,
                 [],
                 [],
                 null,
@@ -105,10 +109,11 @@ public void InputClient_Constructor_HandlesNullApiVersions()
             // Act
             var client = new InputClient(
                 "TestClient",
-                "TestNamespace", 
+                "TestNamespace",
                 "TestNamespace.TestClient",
                 "Test summary",
                 "Test documentation",
+                false,
                 [],
                 [],
                 null,
@@ -131,4 +136,4 @@ public void InputClient_DefaultConstructor_HasEmptyApiVersions()
             Assert.AreEqual(0, client.ApiVersions.Count);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/common/InputFactory.cs b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/common/InputFactory.cs
index 3492ce53eed..51335bbf84e 100644
--- a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/common/InputFactory.cs
+++ b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/common/InputFactory.cs
@@ -668,7 +668,7 @@ public static InputServiceMethodResponse ServiceMethodResponse(InputType? type,
 
         private static readonly Dictionary<InputClient, IList<InputClient>> _childClientsCache = new();
 
-        public static InputClient Client(string name, string clientNamespace = "Sample", string? doc = null, IEnumerable<InputServiceMethod>? methods = null, IEnumerable<InputParameter>? parameters = null, InputClient? parent = null, string? crossLanguageDefinitionId = null, IEnumerable<string>? apiVersions = null, InputClientInitializedBy initializedBy = InputClientInitializedBy.Default)
+        public static InputClient Client(string name, string clientNamespace = "Sample", string? doc = null, IEnumerable<InputServiceMethod>? methods = null, IEnumerable<InputParameter>? parameters = null, InputClient? parent = null, string? crossLanguageDefinitionId = null, IEnumerable<string>? apiVersions = null, InputClientInitializedBy initializedBy = InputClientInitializedBy.Default, bool? isMultiServiceClient = false)
         {
             // when this client has parent, we add the constructed client into the `children` list of the parent
             var clientChildren = new List<InputClient>();
@@ -678,6 +678,7 @@ public static InputClient Client(string name, string clientNamespace = "Sample",
                 crossLanguageDefinitionId ?? $"{clientNamespace}.{name}",
                 string.Empty,
                 doc ?? $"{name} description",
+                isMultiServiceClient ?? false,
                 methods is null ? [] : [.. methods],
                 parameters is null ? [] : [.. parameters],
                 parent,
diff --git a/packages/http-client-csharp/generator/TestProjects/Local/Sample-TypeSpec/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Local/Sample-TypeSpec/tspCodeModel.json
index 32651351eef..42e9762adf7 100644
--- a/packages/http-client-csharp/generator/TestProjects/Local/Sample-TypeSpec/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Local/Sample-TypeSpec/tspCodeModel.json
@@ -8718,7 +8718,8 @@
           ],
           "parent": {
             "$ref": "368"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "636",
@@ -9080,7 +9081,8 @@
           ],
           "parent": {
             "$ref": "368"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "655",
@@ -9281,7 +9283,8 @@
           ],
           "parent": {
             "$ref": "368"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "666",
@@ -9444,9 +9447,11 @@
           ],
           "parent": {
             "$ref": "368"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ],
   "auth": {
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/api-key/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/api-key/tspCodeModel.json
index b626ce960b4..81608214ea7 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/api-key/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/api-key/tspCodeModel.json
@@ -163,7 +163,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Authentication.ApiKey",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ],
   "auth": {
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/http/custom/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/http/custom/tspCodeModel.json
index 6f358b85bbe..5034f4006e6 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/http/custom/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/http/custom/tspCodeModel.json
@@ -163,7 +163,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Authentication.Http.Custom",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ],
   "auth": {
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/noauth/union/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/noauth/union/tspCodeModel.json
index d8c20c59a8d..9050aa1d8d4 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/noauth/union/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/noauth/union/tspCodeModel.json
@@ -126,7 +126,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Authentication.Noauth.Union",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ],
   "auth": {
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/oauth2/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/oauth2/tspCodeModel.json
index 5b2a5968dab..9095bf4638b 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/oauth2/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/oauth2/tspCodeModel.json
@@ -163,7 +163,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Authentication.OAuth2",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ],
   "auth": {
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/union/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/union/tspCodeModel.json
index eae391acb19..9043d5eefdb 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/union/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/authentication/union/tspCodeModel.json
@@ -126,7 +126,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Authentication.Union",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ],
   "auth": {
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/client-operation-group/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/client-operation-group/tspCodeModel.json
index 2efe60bb279..2f83772b919 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/client-operation-group/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/client-operation-group/tspCodeModel.json
@@ -309,7 +309,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "8"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "22",
@@ -402,9 +403,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "8"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     },
     {
       "$id": "28",
@@ -587,9 +590,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "28"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/default/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/default/tspCodeModel.json
index f55bfdb27a1..ac4438a258a 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/default/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/default/tspCodeModel.json
@@ -365,9 +365,11 @@
               "apiVersions": [],
               "parent": {
                 "$ref": "16"
-              }
+              },
+              "isMultiServiceClient": false
             }
-          ]
+          ],
+          "isMultiServiceClient": false
         },
         {
           "$id": "26",
@@ -553,9 +555,11 @@
               "apiVersions": [],
               "parent": {
                 "$ref": "26"
-              }
+              },
+              "isMultiServiceClient": false
             }
-          ]
+          ],
+          "isMultiServiceClient": false
         },
         {
           "$id": "38",
@@ -685,7 +689,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "8"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "46",
@@ -815,9 +820,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "8"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/multi-client/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/multi-client/tspCodeModel.json
index 04b3df4d83d..8c6edc1ceef 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/multi-client/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/multi-client/tspCodeModel.json
@@ -253,7 +253,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Client.Structure.MultiClient.ClientA",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     },
     {
       "$id": "18",
@@ -417,7 +418,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Client.Structure.MultiClient.ClientB",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/renamed-operation/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/renamed-operation/tspCodeModel.json
index ca7d3d77caf..fc407489fff 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/renamed-operation/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/renamed-operation/tspCodeModel.json
@@ -420,9 +420,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "8"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/two-operation-group/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/two-operation-group/tspCodeModel.json
index b2c6fde754d..92badf98eca 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/two-operation-group/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/client/structure/two-operation-group/tspCodeModel.json
@@ -308,7 +308,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "8"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "22",
@@ -475,9 +476,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "8"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/documentation/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/documentation/tspCodeModel.json
index d40b6cafc86..bfcdaeec6b0 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/documentation/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/documentation/tspCodeModel.json
@@ -433,7 +433,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "12"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "30",
@@ -597,9 +598,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "12"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/array/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/array/tspCodeModel.json
index d748bcd4b36..7820bc1b0d2 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/array/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/array/tspCodeModel.json
@@ -987,9 +987,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "27"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/bytes/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/bytes/tspCodeModel.json
index 93af3e62c79..be16b0baa22 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/bytes/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/bytes/tspCodeModel.json
@@ -994,7 +994,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "67"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "97",
@@ -1665,7 +1666,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "67"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "133",
@@ -2032,7 +2034,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "67"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "159",
@@ -2680,7 +2683,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "67"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "203",
@@ -3199,9 +3203,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "67"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/datetime/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/datetime/tspCodeModel.json
index 885fde54685..3fa8dd349c0 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/datetime/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/datetime/tspCodeModel.json
@@ -955,7 +955,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "44"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "88",
@@ -1782,7 +1783,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "44"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "132",
@@ -2287,7 +2289,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "44"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "172",
@@ -2562,9 +2565,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "44"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/duration/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/duration/tspCodeModel.json
index 06cabf75f40..b0e62bf7a58 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/duration/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/duration/tspCodeModel.json
@@ -2570,7 +2570,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "119"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "241",
@@ -4801,7 +4802,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "119"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "357",
@@ -6216,9 +6218,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "119"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/numeric/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/numeric/tspCodeModel.json
index 6774f9010c6..7542ab11348 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/numeric/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/encode/numeric/tspCodeModel.json
@@ -771,9 +771,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "22"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/basic/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/basic/tspCodeModel.json
index ca9b51261b2..b657055228e 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/basic/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/basic/tspCodeModel.json
@@ -314,7 +314,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "11"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "25",
@@ -478,9 +479,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "11"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/body-optionality/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/body-optionality/tspCodeModel.json
index 0723769e274..a94e8f27313 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/body-optionality/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/body-optionality/tspCodeModel.json
@@ -653,9 +653,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "12"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/collection-format/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/collection-format/tspCodeModel.json
index 19eac4aceec..6872ea8cefc 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/collection-format/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/collection-format/tspCodeModel.json
@@ -404,7 +404,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "1"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "27",
@@ -527,9 +528,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "1"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/path/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/path/tspCodeModel.json
index bdb31ab5be8..7c3ae400989 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/path/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/path/tspCodeModel.json
@@ -214,7 +214,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Parameters.Path",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/query/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/query/tspCodeModel.json
index fd10ca858ab..8599f433030 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/query/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/query/tspCodeModel.json
@@ -202,9 +202,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "5"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/spread/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/spread/tspCodeModel.json
index 16d4ddce1f6..870b1189c76 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/spread/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/parameters/spread/tspCodeModel.json
@@ -1367,7 +1367,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "50"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "110",
@@ -2423,9 +2424,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "50"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/content-negotiation/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/content-negotiation/tspCodeModel.json
index 35e1a27ca50..45f58199781 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/content-negotiation/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/content-negotiation/tspCodeModel.json
@@ -550,7 +550,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "31"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "49",
@@ -781,9 +782,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "31"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/json-merge-patch/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/json-merge-patch/tspCodeModel.json
index 1a3db1c7798..b577291e9ff 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/json-merge-patch/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/json-merge-patch/tspCodeModel.json
@@ -1107,7 +1107,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Payload.JsonMergePatch",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/media-type/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/media-type/tspCodeModel.json
index b58fcc04d1b..551aaeb33b5 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/media-type/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/media-type/tspCodeModel.json
@@ -649,9 +649,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "17"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/multipart/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/multipart/tspCodeModel.json
index 654b074b5fe..aca01b6f369 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/multipart/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/multipart/tspCodeModel.json
@@ -3589,7 +3589,8 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "219"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 },
                 {
                   "$id": "251",
@@ -3749,13 +3750,17 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "219"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 }
-              ]
+              ],
+              "isMultiServiceClient": false
             }
-          ]
+          ],
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/pageable/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/pageable/tspCodeModel.json
index be4a5cc8bb8..491f9b9668d 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/pageable/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/payload/pageable/tspCodeModel.json
@@ -2768,9 +2768,11 @@
               "apiVersions": [],
               "parent": {
                 "$ref": "81"
-              }
+              },
+              "isMultiServiceClient": false
             }
-          ]
+          ],
+          "isMultiServiceClient": false
         },
         {
           "$id": "199",
@@ -3042,9 +3044,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "77"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/resiliency/srv-driven/v1/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/resiliency/srv-driven/v1/tspCodeModel.json
index 7cda299454d..e51ba133a2b 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/resiliency/srv-driven/v1/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/resiliency/srv-driven/v1/tspCodeModel.json
@@ -345,7 +345,8 @@
       "crossLanguageDefinitionId": "Resiliency.ServiceDriven",
       "apiVersions": [
         "v1"
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/resiliency/srv-driven/v2/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/resiliency/srv-driven/v2/tspCodeModel.json
index cb0150079cb..528d49145e9 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/resiliency/srv-driven/v2/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/resiliency/srv-driven/v2/tspCodeModel.json
@@ -536,7 +536,8 @@
       "apiVersions": [
         "v1",
         "v2"
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/response/status-code-range/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/response/status-code-range/tspCodeModel.json
index 3f6cf9c2e14..3c3d5b614c5 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/response/status-code-range/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/response/status-code-range/tspCodeModel.json
@@ -317,7 +317,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Response.StatusCodeRange",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/routes/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/routes/tspCodeModel.json
index 18099b5ed80..09225167e9c 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/routes/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/routes/tspCodeModel.json
@@ -594,7 +594,8 @@
               "apiVersions": [],
               "parent": {
                 "$ref": "7"
-              }
+              },
+              "isMultiServiceClient": false
             },
             {
               "$id": "45",
@@ -947,7 +948,8 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "45"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 },
                 {
                   "$id": "72",
@@ -1227,9 +1229,11 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "45"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 }
-              ]
+              ],
+              "isMultiServiceClient": false
             },
             {
               "$id": "90",
@@ -1555,7 +1559,8 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "90"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 },
                 {
                   "$id": "112",
@@ -1835,9 +1840,11 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "90"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 }
-              ]
+              ],
+              "isMultiServiceClient": false
             },
             {
               "$id": "130",
@@ -2163,7 +2170,8 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "130"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 },
                 {
                   "$id": "152",
@@ -2443,9 +2451,11 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "130"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 }
-              ]
+              ],
+              "isMultiServiceClient": false
             },
             {
               "$id": "170",
@@ -2771,7 +2781,8 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "170"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 },
                 {
                   "$id": "192",
@@ -3051,11 +3062,14 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "170"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 }
-              ]
+              ],
+              "isMultiServiceClient": false
             }
-          ]
+          ],
+          "isMultiServiceClient": false
         },
         {
           "$id": "210",
@@ -3659,7 +3673,8 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "232"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 },
                 {
                   "$id": "254",
@@ -3930,9 +3945,11 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "232"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 }
-              ]
+              ],
+              "isMultiServiceClient": false
             },
             {
               "$id": "272",
@@ -4249,7 +4266,8 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "272"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 },
                 {
                   "$id": "294",
@@ -4520,11 +4538,14 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "272"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 }
-              ]
+              ],
+              "isMultiServiceClient": false
             }
-          ]
+          ],
+          "isMultiServiceClient": false
         },
         {
           "$id": "312",
@@ -4608,9 +4629,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "1"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/serialization/encoded-name/json/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/serialization/encoded-name/json/tspCodeModel.json
index f668470ab70..6d3d4efcf0c 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/serialization/encoded-name/json/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/serialization/encoded-name/json/tspCodeModel.json
@@ -360,9 +360,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "8"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/server/endpoint/not-defined/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/server/endpoint/not-defined/tspCodeModel.json
index 4997ff6ac68..ada5277b8f8 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/server/endpoint/not-defined/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/server/endpoint/not-defined/tspCodeModel.json
@@ -76,7 +76,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Server.Endpoint.NotDefined",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/server/path/multiple/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/server/path/multiple/tspCodeModel.json
index 2af4d7eefa8..be1805d3428 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/server/path/multiple/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/server/path/multiple/tspCodeModel.json
@@ -229,7 +229,8 @@
       "crossLanguageDefinitionId": "Server.Path.Multiple",
       "apiVersions": [
         "v1.0"
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/server/path/single/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/server/path/single/tspCodeModel.json
index edb753e6884..4cbca1ef729 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/server/path/single/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/server/path/single/tspCodeModel.json
@@ -76,7 +76,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Server.Path.Single",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/server/versions/not-versioned/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/server/versions/not-versioned/tspCodeModel.json
index e789fd54875..6ddf39922b8 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/server/versions/not-versioned/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/server/versions/not-versioned/tspCodeModel.json
@@ -239,7 +239,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Server.Versions.NotVersioned",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/server/versions/versioned/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/server/versions/versioned/tspCodeModel.json
index 3c0577ba125..018b4f1792e 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/server/versions/versioned/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/server/versions/versioned/tspCodeModel.json
@@ -378,7 +378,8 @@
       "apiVersions": [
         "2021-01-01-preview",
         "2022-12-01-preview"
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/special-headers/conditional-request/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/special-headers/conditional-request/tspCodeModel.json
index e88aeadaed2..9b6408fc83b 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/special-headers/conditional-request/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/special-headers/conditional-request/tspCodeModel.json
@@ -416,7 +416,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "SpecialHeaders.ConditionalRequest",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/special-headers/repeatability/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/special-headers/repeatability/tspCodeModel.json
index 63467af4711..40f123ec483 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/special-headers/repeatability/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/special-headers/repeatability/tspCodeModel.json
@@ -243,7 +243,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "SpecialHeaders.Repeatability",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/special-words/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/special-words/tspCodeModel.json
index b89ad09e2fb..ebb741bba11 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/special-words/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/special-words/tspCodeModel.json
@@ -5871,7 +5871,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "194"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "400",
@@ -6145,7 +6146,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "194"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "416",
@@ -7414,7 +7416,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "194"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "486",
@@ -10182,9 +10185,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "194"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/array/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/array/tspCodeModel.json
index c09d5af4996..855cfbbc47a 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/array/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/array/tspCodeModel.json
@@ -817,7 +817,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "82",
@@ -1071,7 +1072,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "98",
@@ -1325,7 +1327,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "114",
@@ -1579,7 +1582,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "130",
@@ -1833,7 +1837,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "146",
@@ -2095,7 +2100,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "163",
@@ -2357,7 +2363,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "180",
@@ -2611,7 +2618,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "196",
@@ -2854,7 +2862,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "210",
@@ -3113,7 +3122,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "227",
@@ -3372,7 +3382,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "244",
@@ -3631,7 +3642,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "261",
@@ -3890,7 +3902,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "278",
@@ -4145,9 +4158,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "62"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/dictionary/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/dictionary/tspCodeModel.json
index 42db82b8c7c..54c8511c188 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/dictionary/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/dictionary/tspCodeModel.json
@@ -731,7 +731,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "72",
@@ -990,7 +991,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "89",
@@ -1249,7 +1251,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "106",
@@ -1508,7 +1511,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "123",
@@ -1767,7 +1771,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "140",
@@ -2034,7 +2039,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "158",
@@ -2301,7 +2307,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "176",
@@ -2560,7 +2567,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "193",
@@ -2803,7 +2811,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "207",
@@ -3046,7 +3055,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "221",
@@ -3310,9 +3320,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/enum/extensible/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/enum/extensible/tspCodeModel.json
index 942e411bfd6..acead53f75a 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/enum/extensible/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/enum/extensible/tspCodeModel.json
@@ -744,9 +744,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "26"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/enum/fixed/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/enum/fixed/tspCodeModel.json
index 7364dc8a8d0..f7adc23b9da 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/enum/fixed/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/enum/fixed/tspCodeModel.json
@@ -632,9 +632,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "22"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/empty/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/empty/tspCodeModel.json
index 005de7878b6..6be9ee9af23 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/empty/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/empty/tspCodeModel.json
@@ -498,7 +498,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Type.Model.Empty",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/enum-discriminator/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/enum-discriminator/tspCodeModel.json
index 44274175219..eebd88c2424 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/enum-discriminator/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/enum-discriminator/tspCodeModel.json
@@ -1297,7 +1297,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Type.Model.Inheritance.EnumDiscriminator",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/nested-discriminator/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/nested-discriminator/tspCodeModel.json
index d4d18fcfe64..4f94383f20a 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/nested-discriminator/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/nested-discriminator/tspCodeModel.json
@@ -1104,7 +1104,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Type.Model.Inheritance.NestedDiscriminator",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/not-discriminated/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/not-discriminated/tspCodeModel.json
index 0c111b63ec2..46694a7ea9e 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/not-discriminated/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/not-discriminated/tspCodeModel.json
@@ -582,7 +582,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Type.Model.Inheritance.NotDiscriminated",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/recursive/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/recursive/tspCodeModel.json
index 28862ccf662..80548524bd8 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/recursive/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/recursive/tspCodeModel.json
@@ -357,7 +357,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Type.Model.Inheritance.Recursive",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/single-discriminator/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/single-discriminator/tspCodeModel.json
index f60046c387f..cdcc40520b6 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/single-discriminator/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/inheritance/single-discriminator/tspCodeModel.json
@@ -1295,7 +1295,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Type.Model.Inheritance.SingleDiscriminator",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/usage/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/usage/tspCodeModel.json
index af361f5ce12..6805dd93b07 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/usage/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/usage/tspCodeModel.json
@@ -576,7 +576,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Type.Model.Usage",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/visibility/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/visibility/tspCodeModel.json
index a9b93b39913..ffd55f83009 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/visibility/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/model/visibility/tspCodeModel.json
@@ -1346,7 +1346,8 @@
       "initializedBy": 1,
       "decorators": [],
       "crossLanguageDefinitionId": "Type.Model.Visibility",
-      "apiVersions": []
+      "apiVersions": [],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/additional-properties/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/additional-properties/tspCodeModel.json
index d3ea7c0beff..440dae9853d 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/additional-properties/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/additional-properties/tspCodeModel.json
@@ -3281,7 +3281,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "299",
@@ -3529,7 +3530,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "313",
@@ -3777,7 +3779,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "327",
@@ -4025,7 +4028,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "341",
@@ -4273,7 +4277,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "355",
@@ -4521,7 +4526,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "369",
@@ -4769,7 +4775,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "383",
@@ -5017,7 +5024,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "397",
@@ -5265,7 +5273,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "411",
@@ -5513,7 +5522,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "425",
@@ -5761,7 +5771,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "439",
@@ -6009,7 +6020,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "453",
@@ -6257,7 +6269,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "467",
@@ -6505,7 +6518,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "481",
@@ -6753,7 +6767,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "495",
@@ -7001,7 +7016,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "509",
@@ -7249,7 +7265,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "523",
@@ -7497,7 +7514,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "537",
@@ -7745,7 +7763,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "551",
@@ -7993,7 +8012,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "565",
@@ -8241,7 +8261,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "579",
@@ -8489,7 +8510,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "593",
@@ -8737,7 +8759,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "607",
@@ -8985,7 +9008,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "621",
@@ -9233,7 +9257,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "635",
@@ -9481,7 +9506,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "649",
@@ -9729,7 +9755,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "663",
@@ -9977,7 +10004,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "677",
@@ -10225,7 +10253,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "691",
@@ -10473,7 +10502,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "705",
@@ -10721,9 +10751,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "281"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/nullable/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/nullable/tspCodeModel.json
index 12920965491..82a06227994 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/nullable/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/nullable/tspCodeModel.json
@@ -1722,7 +1722,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "134"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "162",
@@ -2167,7 +2168,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "134"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "186",
@@ -2612,7 +2614,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "134"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "210",
@@ -3057,7 +3060,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "134"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "234",
@@ -3502,7 +3506,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "134"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "258",
@@ -3947,7 +3952,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "134"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "282",
@@ -4392,9 +4398,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "134"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/optionality/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/optionality/tspCodeModel.json
index b5395ecd876..909a4000c4b 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/optionality/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/optionality/tspCodeModel.json
@@ -2421,7 +2421,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "229",
@@ -2866,7 +2867,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "253",
@@ -3311,7 +3313,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "277",
@@ -3756,7 +3759,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "301",
@@ -4201,7 +4205,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "325",
@@ -4646,7 +4651,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "349",
@@ -5091,7 +5097,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "373",
@@ -5536,7 +5543,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "397",
@@ -5981,7 +5989,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "421",
@@ -6426,7 +6435,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "445",
@@ -6871,7 +6881,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "469",
@@ -7316,7 +7327,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "493",
@@ -7761,7 +7773,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "517",
@@ -8206,7 +8219,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "541",
@@ -8651,7 +8665,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "565",
@@ -9097,9 +9112,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "201"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/value-types/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/value-types/tspCodeModel.json
index 0c8e502244f..9251942174e 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/value-types/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/property/value-types/tspCodeModel.json
@@ -2720,7 +2720,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "253",
@@ -2968,7 +2969,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "267",
@@ -3216,7 +3218,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "281",
@@ -3464,7 +3467,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "295",
@@ -3712,7 +3716,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "309",
@@ -3960,7 +3965,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "323",
@@ -4208,7 +4214,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "337",
@@ -4456,7 +4463,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "351",
@@ -4704,7 +4712,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "365",
@@ -4952,7 +4961,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "379",
@@ -5200,7 +5210,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "393",
@@ -5448,7 +5459,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "407",
@@ -5696,7 +5708,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "421",
@@ -5944,7 +5957,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "435",
@@ -6192,7 +6206,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "449",
@@ -6440,7 +6455,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "463",
@@ -6688,7 +6704,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "477",
@@ -6936,7 +6953,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "491",
@@ -7184,7 +7202,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "505",
@@ -7432,7 +7451,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "519",
@@ -7680,7 +7700,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "533",
@@ -7928,7 +7949,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "547",
@@ -8176,7 +8198,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "561",
@@ -8424,7 +8447,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "575",
@@ -8672,7 +8696,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "589",
@@ -8920,7 +8945,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "603",
@@ -9168,7 +9194,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "617",
@@ -9416,7 +9443,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "631",
@@ -9664,9 +9692,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "235"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/scalar/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/scalar/tspCodeModel.json
index 694d0269634..d36421f0166 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/scalar/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/scalar/tspCodeModel.json
@@ -713,7 +713,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "72",
@@ -979,7 +980,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "89",
@@ -1245,7 +1247,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "106",
@@ -1586,7 +1589,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "129",
@@ -1927,7 +1931,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "152",
@@ -2187,7 +2192,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "170",
@@ -2404,9 +2410,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/union/discriminated/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/union/discriminated/tspCodeModel.json
index eab4e132739..509b7f9d97b 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/union/discriminated/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/union/discriminated/tspCodeModel.json
@@ -793,7 +793,8 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "43"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 },
                 {
                   "$id": "68",
@@ -1131,11 +1132,14 @@
                   "apiVersions": [],
                   "parent": {
                     "$ref": "43"
-                  }
+                  },
+                  "isMultiServiceClient": false
                 }
-              ]
+              ],
+              "isMultiServiceClient": false
             }
-          ]
+          ],
+          "isMultiServiceClient": false
         },
         {
           "$id": "89",
@@ -1519,7 +1523,8 @@
               "apiVersions": [],
               "parent": {
                 "$ref": "89"
-              }
+              },
+              "isMultiServiceClient": false
             },
             {
               "$id": "114",
@@ -1857,11 +1862,14 @@
               "apiVersions": [],
               "parent": {
                 "$ref": "89"
-              }
+              },
+              "isMultiServiceClient": false
             }
-          ]
+          ],
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/union/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/union/tspCodeModel.json
index 3e5a7701e23..59315302693 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/type/union/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/type/union/tspCodeModel.json
@@ -2228,7 +2228,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "159"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "177",
@@ -2471,7 +2472,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "159"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "191",
@@ -2714,7 +2716,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "159"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "205",
@@ -2957,7 +2960,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "159"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "219",
@@ -3200,7 +3204,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "159"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "233",
@@ -3443,7 +3448,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "159"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "247",
@@ -3686,7 +3692,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "159"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "261",
@@ -3929,7 +3936,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "159"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "275",
@@ -4172,7 +4180,8 @@
           "apiVersions": [],
           "parent": {
             "$ref": "159"
-          }
+          },
+          "isMultiServiceClient": false
         },
         {
           "$id": "289",
@@ -4415,9 +4424,11 @@
           "apiVersions": [],
           "parent": {
             "$ref": "159"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/added/v1/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/added/v1/tspCodeModel.json
index 9eedb2d2d22..12e48308e43 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/added/v1/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/added/v1/tspCodeModel.json
@@ -388,7 +388,8 @@
       "crossLanguageDefinitionId": "Versioning.Added",
       "apiVersions": [
         "v1"
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/added/v2/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/added/v2/tspCodeModel.json
index 19c32f67d05..36ff20a6d78 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/added/v2/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/added/v2/tspCodeModel.json
@@ -1085,9 +1085,11 @@
           ],
           "parent": {
             "$ref": "41"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/madeOptional/v1/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/madeOptional/v1/tspCodeModel.json
index 7ac3dee87ec..13a7b66ac6e 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/madeOptional/v1/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/madeOptional/v1/tspCodeModel.json
@@ -400,7 +400,8 @@
       "crossLanguageDefinitionId": "Versioning.MadeOptional",
       "apiVersions": [
         "v1"
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/madeOptional/v2/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/madeOptional/v2/tspCodeModel.json
index ec32083ed9d..6b505194c2d 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/madeOptional/v2/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/madeOptional/v2/tspCodeModel.json
@@ -417,7 +417,8 @@
       "apiVersions": [
         "v1",
         "v2"
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/removed/v1/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/removed/v1/tspCodeModel.json
index 96737162302..7afc263d6d4 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/removed/v1/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/removed/v1/tspCodeModel.json
@@ -1398,9 +1398,11 @@
           ],
           "parent": {
             "$ref": "55"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/removed/v2/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/removed/v2/tspCodeModel.json
index 11dd0f6f687..be153d14433 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/removed/v2/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/removed/v2/tspCodeModel.json
@@ -760,7 +760,8 @@
         "v1",
         "v2preview",
         "v2"
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/removed/v2Preview/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/removed/v2Preview/tspCodeModel.json
index 016ebbe3362..295629a52e2 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/removed/v2Preview/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/removed/v2Preview/tspCodeModel.json
@@ -1352,9 +1352,11 @@
           ],
           "parent": {
             "$ref": "51"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/renamedFrom/v1/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/renamedFrom/v1/tspCodeModel.json
index ac464bc31cd..e01a0b0e7cf 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/renamedFrom/v1/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/renamedFrom/v1/tspCodeModel.json
@@ -734,9 +734,11 @@
           ],
           "parent": {
             "$ref": "24"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/renamedFrom/v2/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/renamedFrom/v2/tspCodeModel.json
index c6fe7809d10..61736e32e6b 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/renamedFrom/v2/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/renamedFrom/v2/tspCodeModel.json
@@ -753,9 +753,11 @@
           ],
           "parent": {
             "$ref": "25"
-          }
+          },
+          "isMultiServiceClient": false
         }
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/returnTypeChangedFrom/v1/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/returnTypeChangedFrom/v1/tspCodeModel.json
index 0a43cc2d0ac..001a69fb017 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/returnTypeChangedFrom/v1/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/returnTypeChangedFrom/v1/tspCodeModel.json
@@ -347,7 +347,8 @@
       "crossLanguageDefinitionId": "Versioning.ReturnTypeChangedFrom",
       "apiVersions": [
         "v1"
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/returnTypeChangedFrom/v2/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/returnTypeChangedFrom/v2/tspCodeModel.json
index 4ac2b2076d5..e449424adf9 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/returnTypeChangedFrom/v2/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/returnTypeChangedFrom/v2/tspCodeModel.json
@@ -364,7 +364,8 @@
       "apiVersions": [
         "v1",
         "v2"
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/typeChangedFrom/v1/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/typeChangedFrom/v1/tspCodeModel.json
index d36f274f272..89077752c05 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/typeChangedFrom/v1/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/typeChangedFrom/v1/tspCodeModel.json
@@ -400,7 +400,8 @@
       "crossLanguageDefinitionId": "Versioning.TypeChangedFrom",
       "apiVersions": [
         "v1"
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }
diff --git a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/typeChangedFrom/v2/tspCodeModel.json b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/typeChangedFrom/v2/tspCodeModel.json
index 93566622684..b48a68ad6ff 100644
--- a/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/typeChangedFrom/v2/tspCodeModel.json
+++ b/packages/http-client-csharp/generator/TestProjects/Spector/http/versioning/typeChangedFrom/v2/tspCodeModel.json
@@ -417,7 +417,8 @@
       "apiVersions": [
         "v1",
         "v2"
-      ]
+      ],
+      "isMultiServiceClient": false
     }
   ]
 }