chore: fix typo in docs and add request header for function calls (#494)

README.md

@@ -153,7 +153,7 @@ If you pass a `parse` function, it will automatically parse the `arguments` for
 and returns any parsing errors to the model to attempt auto-recovery.
 Otherwise, the args will be passed to the function you provide as a string.
 
-If you pass `function_call: {name: …}` or `tool_call: {function: {name: …}}` instead of `auto`,
+If you pass `function_call: {name: …}` or `tool_choice: {function: {name: …}}` instead of `auto`,
 it returns immediately after calling that function (and only loops to auto-recover parsing errors).
 
 ```ts

examples/tool-call-helpers.ts

@@ -85,7 +85,7 @@ async function main() {
   console.log(runner.messages);
 
   console.log();
-  console.log('final chat competion');
+  console.log('final chat completion');
   console.dir(result, { depth: null });
 }
 

src/lib/ChatCompletionStream.ts

@@ -52,7 +52,13 @@ export class ChatCompletionStream
     options?: Core.RequestOptions,
   ): ChatCompletionStream {
     const runner = new ChatCompletionStream();
-    runner._run(() => runner._runChatCompletion(completions, { ...params, stream: true }, options));
+    runner._run(() =>
+      runner._runChatCompletion(
+        completions,
+        { ...params, stream: true },
+        { ...options, headers: { ...options?.headers, 'X-Stainless-Helper-Method': 'stream' } },
+      ),
+    );
     return runner;
   }
 

src/lib/ChatCompletionStreamingRunner.ts

@@ -43,7 +43,12 @@ export class ChatCompletionStreamingRunner
     options?: RunnerOptions,
   ): ChatCompletionStreamingRunner {
     const runner = new ChatCompletionStreamingRunner();
-    runner._run(() => runner._runFunctions(completions, params, options));
+    runner._run(() =>
+      runner._runFunctions(completions, params, {
+        ...options,
+        headers: { ...options?.headers, 'X-Stainless-Helper-Method': 'runFunctions' },
+      }),
+    );
     return runner;
   }
 
@@ -53,7 +58,12 @@ export class ChatCompletionStreamingRunner
     options?: RunnerOptions,
   ): ChatCompletionStreamingRunner {
     const runner = new ChatCompletionStreamingRunner();
-    runner._run(() => runner._runTools(completions, params, options));
+    runner._run(() =>
+      runner._runTools(completions, params, {
+        ...options,
+        headers: { ...options?.headers, 'X-Stainless-Helper-Method': 'runTools' },
+      }),
+    );
     return runner;
   }
 }