diff --git a/src/codegen/generators/typescript/channels/openapi.ts b/src/codegen/generators/typescript/channels/openapi.ts
index a1d850f1..0957fc5f 100644
--- a/src/codegen/generators/typescript/channels/openapi.ts
+++ b/src/codegen/generators/typescript/channels/openapi.ts
@@ -124,7 +124,7 @@ export async function generateTypeScriptChannelsForOpenAPI(
       functionName: r.functionName,
       messageType: r.messageType ?? '',
       replyType: r.replyType,
-      parameterType: undefined
+      parameterType: r.parameterType
     }))
   );
 
diff --git a/src/codegen/generators/typescript/channels/protocols/http/client.ts b/src/codegen/generators/typescript/channels/protocols/http/client.ts
index b394ac34..57357485 100644
--- a/src/codegen/generators/typescript/channels/protocols/http/client.ts
+++ b/src/codegen/generators/typescript/channels/protocols/http/client.ts
@@ -81,7 +81,8 @@ ${functionCode}`;
     code,
     functionName,
     dependencies: [],
-    functionType: ChannelFunctionTypes.HTTP_CLIENT
+    functionType: ChannelFunctionTypes.HTTP_CLIENT,
+    parameterType: channelParameters?.name
   };
 }
 
diff --git a/src/codegen/types.ts b/src/codegen/types.ts
index f10a3cf3..c6b9c437 100644
--- a/src/codegen/types.ts
+++ b/src/codegen/types.ts
@@ -206,6 +206,10 @@ export interface HttpRenderType {
   functionType: ChannelFunctionTypes;
   messageType?: string;
   replyType: string;
+  // Name of the generated path-parameter model, when the operation declares
+  // path parameters. Consumers (e.g. README generation) rely on this to know an
+  // operation requires a `parameters` argument.
+  parameterType?: string;
 }
 
 const SCHEMA_DESCRIPTION =
diff --git a/test/codegen/generators/typescript/channels.spec.ts b/test/codegen/generators/typescript/channels.spec.ts
index 864dd955..d116f304 100644
--- a/test/codegen/generators/typescript/channels.spec.ts
+++ b/test/codegen/generators/typescript/channels.spec.ts
@@ -629,6 +629,22 @@ describe('channels', () => {
         const httpProtocolCode = generatedChannels.protocolFiles['http_client'];
         expect(httpProtocolCode).toContain('unmarshal(JSON.stringify(rawData))');
         expect(httpProtocolCode).not.toMatch(/unmarshal\(rawData\)/);
+
+        // Operations with path parameters must expose their parameter model name via
+        // parameterType so downstream consumers (e.g. README generation) know the
+        // operation requires a `parameters` argument. Operations without parameters
+        // must leave it undefined. Regression guard for the previously hardcoded
+        // `parameterType: undefined`.
+        const httpFunctions = generatedChannels.renderedFunctions['http_client'];
+        const withParameters = httpFunctions.find(
+          (fn) => fn.functionName === 'findPetsByStatusAndCategory'
+        );
+        expect(withParameters?.parameterType).toBe('FindPetsByStatusAndCategoryParameters');
+        const withoutParameters = httpFunctions.find(
+          (fn) => fn.functionName !== 'findPetsByStatusAndCategory'
+        );
+        expect(withoutParameters).toBeDefined();
+        expect(withoutParameters?.parameterType).toBeUndefined();
       });
 
       it('should skip generation when http_client is not in protocols', async () => {