Early days. The voice assistant still stutters a bit — latency and fluency will improve as the project evolves. Feedback and contributions are very welcome.

Stimm Voice is a third-party OpenClaw plugin that adds real-time voice conversations to OpenClaw. A fast Python voice agent (LiveKit + STT/TTS/LLM) handles low-latency speech while OpenClaw acts as the reasoning supervisor.

Provider support

| Role | Tested ✅ | May work, untested | |---|---|---| | LLM | Groq | OpenAI, Azure OpenAI, … | | TTS | Deepgram | OpenAI, Cartesia, … | | STT | Hume, ElevenLabs | … |

Contributions and test reports for other providers are very welcome.

Install

Prerequisites: Node.js 22+, Python 3.10+, OpenClaw gateway ≥ 2026.2.0, a LiveKit deployment (local or cloud).

openclaw plugins install openclaw-stimm-voice

Restart the gateway, then run the setup wizard — it handles LiveKit credentials, provider selection, and Python extras:

openclaw voice:setup

Usage

Start a voice session from CLI:

openclaw voice:start

Or just ask the OpenClaw agent in any conversation (WhatsApp, etc.):

"Send me a Stimm Voice link"

The agent starts a session and replies with a one-time link to open on your phone.

Reference

Set config under plugins.entries.stimm-voice.config:

{
  enabled: true,
  livekit: {
    url: "wss://your-project.livekit.cloud",
    apiKey: "APIxxxxx",
    apiSecret: "your-secret",
  },
  web: {
    enabled: true,
    path: "/voice",
  },
  access: {
    mode: "quick-tunnel", // "none" | "quick-tunnel"
    claimTtlSeconds: 120,
    livekitTokenTtlSeconds: 300,
    supervisorSecret: "change-me",
    allowDirectWebSessionCreate: false,
    claimRateLimitPerMinute: 20,
  },
  voiceAgent: {
    spawn: { autoSpawn: true },
    stt: { provider: "deepgram", model: "nova-3" },
    tts: { provider: "openai", model: "gpt-4o-mini-tts", voice: "ash" },
    llm: { provider: "openai", model: "gpt-4o-mini" },
    bufferingLevel: "MEDIUM",
    mode: "hybrid",
  },
}

Notes:

• The extension is disabled by default (enabled: false).
• access.mode="quick-tunnel" requires cloudflared on PATH.
• voiceAgent.tts.voice is provider-specific: OpenAI uses voice names (ash, alloy), ElevenLabs uses voice_id, Cartesia uses voice UUIDs.
• API keys can be set directly in config or via env fallbacks (STIMM_STT_API_KEY, STIMM_TTS_API_KEY, STIMM_LLM_API_KEY).
• access.supervisorSecret supports env fallback (STIMM_SUPERVISOR_SECRET, then OPENCLAW_SUPERVISOR_SECRET).

The voice supervisor calls the OpenClaw agent for reasoning and long-context decisions. For full capability (persistent memory, workspace files, tools), configure the coding profile:

openclaw config set tools.profile coding

The default messaging profile (since 2026-03-02) blocks filesystem tools — the agent can still respond but cannot write IDENTITY.md, USER.md, or workspace files.

openclaw voice:logs --limit 40
openclaw voice:logs --watch --interval 2

Options: --raw, --limit <n>, --watch, --interval <s>, --all-events.

Prints Stimm supervisor OBS_JSON events (inference_started, inference_completed, trigger_sent, no_action) and gateway-side [stimm-voice:supervisor] lines.

• GET <web.path>: serves the web voice UI.
• POST <web.path>/claim: claim exchange endpoint.
• POST <web.path>: disabled by default (403) unless access.allowDirectWebSessionCreate=true.
• POST /stimm/supervisor: internal supervisor callback (protected by access.supervisorSecret).

Browser flow: open shareUrl → page calls POST /voice/claim with claim token → gateway returns a short-lived LiveKit token → browser joins LiveKit.

Gateway methods: stimm.start, stimm.end, stimm.status, stimm.instruct, stimm.mode

Tool name stimm_voice, actions: start_session, end_session, status, instruct, add_context, set_mode

stimm.start / start_session returns room metadata, shareUrl (if quick tunnel enabled), and a one-time claimToken.

Development

This section covers the local dev setup to iterate on the plugin without waiting for npm publish cycles.

Repos involved

| Repo | Role | |---|---| | ~/repos/openclaw | OpenClaw core — gateway binary (dist/index.js) | | ~/repos/openclaw-stimm-voice | This plugin | | ~/repos/stimm/packages/protocol-ts | @stimm/protocol TypeScript package |

In production, a systemd user service runs the gateway automatically. In dev mode, dev-link.sh stops that service so you can run the gateway manually with pnpm, which also auto-rebuilds core if stale.

The gateway loads plugins at runtime using jiti (TypeScript interpreted directly — no plugin build step needed).

Setup dev mode

cd ~/repos/openclaw-stimm-voice
./scripts/dev-link.sh

This script:

1. Builds @stimm/protocol from source (required — jiti loads its dist/)
2. Symlinks node_modules/@stimm/protocol → ~/repos/stimm/packages/protocol-ts
3. Symlinks ~/.openclaw/extensions/stimm-voice → this repo
4. Stops the systemd service to free port 18789

Then start the gateway in the foreground (auto-rebuilds openclaw core if stale):

cd ~/repos/openclaw
pnpm openclaw gateway run --port 18789

Workflow per change type

| What you modified | What to do | |---|---| | Plugin — index.ts, voice.html, src/config.ts… | Ctrl+C → pnpm openclaw gateway run --port 18789 | | Protocol — ~/repos/stimm/packages/protocol-ts/src/ | npm run build inside protocol-ts/ → Ctrl+C → relancer le gateway | | OpenClaw core — ~/repos/openclaw/src/ | Ctrl+C → pnpm openclaw gateway run --port 18789 (rebuild auto) |

For continuous rebuild of @stimm/protocol during a session:

# Terminal dédié
./scripts/dev-watch-stimm.sh

Restore production mode

./scripts/dev-unlink.sh

This removes all symlinks, restores the npm backup (or reinstalls from npm if no backup), and restarts the systemd service.

Architecture notes

• Plugin .ts files are loaded by jiti — no compilation needed after plugin changes, just restart the gateway.
• @stimm/protocol points its main to dist/index.js, so it must be built before any protocol change is visible to jiti.
• The systemd service is production mode. In dev mode, dev-link.sh stops it and you run pnpm openclaw gateway run instead, which rebuilds core automatically when src/ is newer than dist/.