From 67037d42cce77e806ac2612392f7234a70895414 Mon Sep 17 00:00:00 2001
From: "rosetta-livekit-bot[bot]"
 <282703043+rosetta-livekit-bot[bot]@users.noreply.github.com>
Date: Sun, 4 Oct 2026 20:47:22 +0000
Subject: [PATCH] feat: include tool names in telemetry result parts

---
 .changeset/fresh-tools-report.md    | 5 +++++
 agents/src/telemetry/gen_ai.test.ts | 7 ++++++-
 agents/src/telemetry/gen_ai.ts      | 2 ++
 3 files changed, 13 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/fresh-tools-report.md

diff --git a/.changeset/fresh-tools-report.md b/.changeset/fresh-tools-report.md
new file mode 100644
index 0000000000..e0b38c2a05
--- /dev/null
+++ b/.changeset/fresh-tools-report.md
@@ -0,0 +1,5 @@
+---
+'@livekit/agents': patch
+---
+
+Include tool names in telemetry result parts.
diff --git a/agents/src/telemetry/gen_ai.test.ts b/agents/src/telemetry/gen_ai.test.ts
index 40d8840cc7..899b6e9478 100644
--- a/agents/src/telemetry/gen_ai.test.ts
+++ b/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',
diff --git a/agents/src/telemetry/gen_ai.ts b/agents/src/telemetry/gen_ai.ts
index 0a78f40b76..e381117665 100644
--- a/agents/src/telemetry/gen_ai.ts
+++ b/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),
     });
   }