Update guardrails demo to use webrtc

[cursor]

Summary

Automated regeneration triggered by merge of elevenlabs/skills#108 (Update skills from changelog 2026-07-27).

Generation results

  0 generated · 18 verified · 1 updated · 0 failed
  Total time: 10m 38s

#	Example	Result	Time
1	agents/expo/quickstart	✓ Verified	59s
2	agents/nextjs/guardrails	~ Updated	2m 6s
3	agents/nextjs/quickstart	✓ Verified	44s
4	dubbing/nextjs/quickstart	✓ Verified	26s
5	music/nextjs/quickstart	✓ Verified	41s
6	music/python/quickstart	✓ Verified	18s
7	music/typescript/quickstart	✓ Verified	14s
8	sound-effects/nextjs/quickstart	✓ Verified	25s
9	sound-effects/python/quickstart	✓ Verified	13s
10	sound-effects/typescript/quickstart	✓ Verified	20s
11	speech-engine/nextjs/quickstart	✓ Verified	59s
12	speech-to-text/nextjs/realtime	✓ Verified	50s
13	speech-to-text/python/quickstart	✓ Verified	25s
14	speech-to-text/typescript/quickstart	✓ Verified	23s
15	text-to-speech/nextjs/quickstart	✓ Verified	15s
16	text-to-speech/python/quickstart	✓ Verified	18s
17	text-to-speech/typescript/quickstart	✓ Verified	23s
18	voice-changer/nextjs/quickstart	✓ Verified	16s
19	voice-isolator/nextjs/quickstart	✓ Verified	23s

Changed directories

 agents/nextjs/guardrails/example/app/api/agent/route.ts      |  2 ++
 agents/nextjs/guardrails/example/app/api/conversation-token/route.ts | 42 +++++++++++++++-------
 agents/nextjs/guardrails/example/app/page.tsx      |  9 +++--
 agents/nextjs/guardrails/example/package.json      |  2 +-
 4 files changed, 36 insertions(+), 19 deletions(-)

Assessment

These changes are meaningful — they reflect updated ElevenAgents guardrails skill patterns:

• WebRTC token migration: conversation-token route now uses getWebrtcToken() instead of getSignedUrl(), and the client uses conversationToken instead of signedUrl/connectionType: websocket
• Guardrail config: Added model and historyMessageCount fields to the investment-recommendations guardrail
• Error handling: Uses ElevenLabsError with proper status code propagation
• Dependency pin: livekit-client override changed from 2.19.1 to 2.16.1

  

---

Note

Low Risk
Changes are limited to example apps, setup scripts, and a scaffold helper—no production auth or data paths—though the WebRTC migration could affect anyone copying the guardrails demo pattern.

Overview
The agents/nextjs/guardrails example moves voice sessions from WebSocket + signed URL to WebRTC: the conversation-token API calls getWebrtcToken() and returns { token }, and the client starts the session with conversationToken instead of signedUrl / connectionType: "websocket". API errors now use ElevenLabsError with upstream status codes when available.

Agent creation adds model (gemini-2.5-flash-lite) and historyMessageCount: 1 on the custom investment-advice guardrail. livekit-client is pinned to 2.16.1 (down from 2.19.1) in the example package.json and guardrails setup.sh.

Python quickstart scripts (music, sound-effects, speech-to-text, text-to-speech) write streamed audio with writelines, catch ApiError (and clearer KeyError for missing API keys) instead of broad Exception handlers. The scaffold script uses min for reference picking and drops an unused slug binding.

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[tadaspetra]

LGTM