feat: include tool names in telemetry result parts

.changeset/fresh-tools-report.md

@@ -0,0 +1,5 @@
+---
+'@livekit/agents': patch
+---
+
+Include tool names in telemetry result parts.

agents/src/telemetry/gen_ai.test.ts

@@ -64,7 +64,12 @@ describe('gen_ai builders', () => {
       arguments: { loc: 'Paris' },
     });
     // a serialized payload is deserialized, as the convention asks of instrumentations
-    expect(messages[2]!.parts[0]!.response).toEqual({ temp: 14 });
+    expect(messages[2]!.parts[0]).toEqual({
+      type: 'tool_call_response',
+      id: 'call_1',
+      name: 'get_weather',
+      response: { temp: 14 },
+    });
 
     const output = genAI.toOutputMessages({
       text: 'one moment',

agents/src/telemetry/gen_ai.ts

@@ -158,6 +158,8 @@ function messageParts(item: ChatItem): MessagePart[] {
     parts.push({
       type: 'tool_call_response',
       id: item.callId,
+      // Optional extension: the OTel response-part schema permits extra fields.
+      ...(item.name ? { name: item.name } : {}),
       response: maybeJson(item.output),
     });
   }