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Tencent SkillHub · AI
Clawfinger Agent Takeover
How to perform a live agent takeover of the Clawfinger voice gateway — dial, inject greetings, handle turns, release, and observe handback. Covers timing, en...
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How to perform a live agent takeover of the Clawfinger voice gateway — dial, inject greetings, handle turns, release, and observe handback. Covers timing, en...
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Documentation
Agent Takeover — Full Lifecycle Guide
How an external agent (OpenClaw plugin, custom script, or any WebSocket client) takes control of a live phone call, handles conversation turns directly, and hands back to the local LLM.
Architecture Overview
Caller <--> Phone App <--> Gateway /api/turn <--> Local LLM | +-- (takeover) --> Agent WS Normal flow: phone sends audio to /api/turn, gateway runs ASR → LLM → TTS, returns audio. Takeover flow: after takeover, gateway sends turn.request to the agent WebSocket instead of calling the local LLM. The agent replies with text, gateway runs TTS, returns audio to phone.
WebSocket (primary — full bidirectional control)
WS /api/agent/ws — No authentication required on the WebSocket itself. Connects, receives all bus events, and sends commands. Send (agent → gateway)FieldsDescriptiondialnumberDial outbound call via ADBinjecttext, session_idQueue TTS message for next turn polltakeoversession_idTake over LLM for this sessionreleasesession_idHand back to local LLMhangupsession_id (optional)Force hang up call + end sessionget_call_statesession_idQuery conversation history and stateend_sessionsession_idMark session ended without phone hangupinject_contextsession_id, contextPush knowledge into LLM contextclear_contextsession_idRemove injected knowledgeping—Heartbeat Receive (gateway → agent)FieldsDescriptiondial.ackok, detailDial resulttakeover.ackok, session_idTakeover confirmedrelease.ackok, session_idRelease confirmedhangup.ackok, detail, session_idHangup resultturn.requestsession_id, transcript, request_idTakeover only — caller spoke, agent must replyturn.startedsession_idTurn processing beganturn.transcripttranscriptASR resultturn.replyreplyLLM/agent reply textturn.completemetrics, transcript, reply, modelTurn finishedsession.endedsession_idSession ended (stale sweep, hangup, or explicit end)
REST (alternative — no persistent connection needed)
MethodPathPurposePOST/api/call/dial{"number": "+49..."} — dial via ADBPOST/api/call/hangup{"session_id": "..."} — force hangupPOST/api/call/inject{"text": "...", "session_id": "..."} — inject TTSGET/api/agent/sessionsList active session IDsGET/api/agent/call/{sid}Full call state (history, instructions, takeover)POST/api/agent/context/{sid}{"context": "..."} — inject knowledge REST cannot do takeover. Takeover requires the WebSocket for real-time turn.request / reply exchange. REST is fine for dial, inject, hangup, and observation.
Takeover Turn Protocol
During takeover, the gateway replaces the local LLM with the agent for response generation: Phone → /api/turn (audio) → Gateway ASR → transcript ↓ Gateway sends to Agent WS: {"type": "turn.request", "session_id": "abc123", "transcript": "what caller said", "request_id": "unique-id"} ↓ Agent replies on same WS: {"reply": "agent's response", "request_id": "unique-id"} ↓ Gateway TTS → audio → Phone
Critical: request_id correlation
The agent must echo back the request_id from the turn.request. Without it, the gateway cannot match the reply to the pending turn and the request times out. // Gateway sends: {"type": "turn.request", "session_id": "abc", "transcript": "hello", "request_id": "a1b2c3"} // Agent must reply: {"reply": "Hi there!", "request_id": "a1b2c3"} No type field needed in the reply — just reply + request_id.
Timeout and fallback
If the agent doesn't reply within the timeout (default 60s, configurable via agent_takeover_timeout in config), the gateway falls back to the local LLM for that single turn. The takeover remains active — the next turn will try the agent again.
Timing Model
Understanding timing is critical for a smooth takeover experience.
Phone polling cadence
The phone app polls /api/turn in a tight loop: Record audio chunk (~2-5s of speech) POST to /api/turn Wait for response (ASR + LLM/agent + TTS) Play response audio Go to step 1 The phone does NOT poll on a fixed interval — it sends the next turn as soon as playback finishes and new audio is captured. Typical turn cycle: 3-8 seconds.
Inject timing
inject queues a pre-synthesized TTS message. It's delivered on the next /api/turn poll, before ASR/LLM processing: Agent injects "Hello!" at T=0 ↓ Phone polls /api/turn at T=3 (next natural poll) ↓ Gateway sees pending inject → returns inject audio immediately (skips ASR/LLM) ↓ Phone plays "Hello!" → polls again Key implications: Inject is NOT instant — there's a delay of up to one poll cycle (3-8s) During takeover, the phone is usually waiting for the agent's reply, so the next poll happens quickly after the agent responds Multiple injects queue up — each delivered on successive polls Inject skips ASR entirely — the phone's recorded audio is ignored for that poll
Takeover timing
T=0 Agent sends {"type": "takeover", "session_id": "..."} T=0 Gateway immediately routes future turns to agent T=0 Agent gets {"type": "takeover.ack", "ok": true} T=3-8 Phone polls /api/turn → gateway ASR → turn.request sent to agent T=3-8 Agent replies → gateway TTS → phone plays agent's response Takeover takes effect instantly on the gateway side. The first turn.request arrives on the next phone poll.
Release timing
T=0 Agent sends {"type": "release", "session_id": "..."} T=0 Gateway removes takeover → local LLM handles future turns T=0 Agent gets {"type": "release.ack", "ok": true} T=3-8 Phone polls /api/turn → local LLM responds (no more turn.requests to agent) Release is also instant. The agent continues receiving bus events (turn.complete, etc.) but no longer gets turn.request messages.
Inject + Takeover ordering
When you inject a greeting AND takeover in quick succession: T=0.0 Agent injects greeting text T=0.5 Agent sends takeover T=3 Phone polls → gets inject (greeting plays) — takeover is active but no turn.request yet T=8 Phone polls again → NOW it's a takeover turn → turn.request sent to agent The inject is consumed first (it takes priority in the turn endpoint), then takeover kicks in on the subsequent poll. This is the correct order for "inject greeting then take over."
Dial-to-first-turn latency
T=0 Agent sends dial command T=0 ADB broadcast sent to phone T=1-3 Phone initiates outbound call T=5-30 Callee picks up (depends on the person) T=+1 Phone detects call connected, sends first /api/turn (greeting) T=+2 Gateway processes greeting (forced_reply → TTS only, no ASR/LLM) T=+5 Greeting plays, phone captures first real audio T=+8 First real turn arrives at gateway Total dial-to-first-real-turn: 10-40 seconds depending on pickup time.
Session Lifecycle
Sessions have a TTL of 60 seconds of inactivity (configurable via session_ttl). The phone polls every 3-8s during a call, so active calls never hit the TTL. But if: The phone crashes or loses USB connection The caller hangs up and the phone doesn't send /api/session/end ...the session auto-ends after 60s of no polls. Session detection after dial: After dialing, the agent needs the session ID. Options: Watch bus events — a turn.started event with session_id arrives when the call connects Poll GET /api/agent/sessions — check for new session IDs Send get_call_state — if you know the session ID Option 1 (events) is most reliable and fastest.
Complete Takeover Lifecycle
1. CONNECT ws://gateway:8996/api/agent/ws 2. DIAL {"type": "dial", "number": "+49..."} WAIT for dial.ack (ok: true) 3. DISCOVER watch events for session_id (turn.started or session.started) 4. INJECT {"type": "inject", "session_id": "...", "text": "Custom greeting"} 5. TAKEOVER {"type": "takeover", "session_id": "..."} WAIT for takeover.ack (ok: true) 6. HANDLE receive turn.request → reply with {reply, request_id} REPEAT for N turns 7. RELEASE {"type": "release", "session_id": "..."} WAIT for release.ack (ok: true) 8. OBSERVE watch turn.complete events → model != "agent" confirms local LLM resumed 9. HANGUP {"type": "hangup", "session_id": "..."} (optional — end call)
Error Handling
ScenarioWhat happensAgent WS disconnects during takeoverAll takeovers auto-released, local LLM resumesAgent doesn't reply within 60sThat turn falls back to local LLM; takeover stays active for next turnSession ends during takeoversession.ended event; further turn.requests stopMultiple agents take over same sessionLast takeover wins (overwrites previous)Takeover of non-existent sessiontakeover.ack with ok: falseRelease without takeoverrelease.ack with ok: false
OpenClaw Plugin (Clawfinger)
If using the Clawfinger OpenClaw plugin, you don't need raw WebSocket code. The plugin tools map directly: Lifecycle stepPlugin toolDialclawfinger_dialCheck sessionsclawfinger_sessionsInspect stateclawfinger_call_stateInject greetingclawfinger_injectTake overclawfinger_takeoverWait for callerclawfinger_turn_wait — blocks until caller speaks, returns transcript + request_idReply to callerclawfinger_turn_reply — send response text with the request_idReleaseclawfinger_releaseHang upclawfinger_hangup Takeover tool workflow: clawfinger_takeover(session_id) → "Takeover active." clawfinger_turn_wait() → {transcript: "...", request_id: "abc123"} clawfinger_turn_reply(request_id, reply) → "Reply sent." clawfinger_turn_wait() → next turn... clawfinger_turn_reply(...) → ... clawfinger_release(session_id) → "Released." Slash commands: /clawfinger dial +49..., /clawfinger takeover <sid>, /clawfinger release <sid>, /clawfinger hangup.
Test Case: Human-Guided Takeover (3 turns)
A complete test walkthrough. Requires: gateway running, phone connected via ADB, a real phone number to call.
Prerequisites
Gateway running on 127.0.0.1:8996 Phone connected via ADB (adb devices shows device) ADB reverse active (adb reverse tcp:8996 tcp:8996) websockets Python package installed (pip install websockets)
Test Script
Save as test_takeover.py in the gateway directory: #!/usr/bin/env python3 """Live takeover test: dial, inject greeting, handle 3 turns, release.""" import asyncio import json import time import websockets GW = "ws://127.0.0.1:8996/api/agent/ws" DIAL_NUMBER = "+49123456789" # <-- change to your number GREETING = ( "Hello! This is a test from the agent takeover system. " "I am now controlling this call. Please say something " "and I will respond for three turns, then hand back to the local assistant." ) REPLIES = [ "That's interesting! I heard you clearly. This is turn one of three. Say something else.", "Got it! That was turn two. One more turn, then I hand back to the local assistant.", "Perfect, that was turn three! Releasing control now. You should notice a change. Goodbye from the agent!", ] async def main(): print(f"[*] Connecting to agent WS: {GW}") async with websockets.connect(GW) as ws: print("[+] Connected") # Helper: drain pending events async def drain(timeout=1.0): events = [] try: while True: raw = await asyncio.wait_for(ws.recv(), timeout=timeout) ev = json.loads(raw) events.append(ev) print(f" [event] {ev.get('type', '?')}") except asyncio.TimeoutError: pass return events await drain(0.5) # 1. Dial print(f"\n[1] Dialing {DIAL_NUMBER}...") await ws.send(json.dumps({"type": "dial", "number": DIAL_NUMBER})) while True: ev = json.loads(await asyncio.wait_for(ws.recv(), timeout=15)) print(f" [event] {ev.get('type')}") if ev.get("type") == "dial.ack": if not ev.get("ok"): print(f" FAIL: {ev.get('detail')}") return print(" OK: dial succeeded") break # 2. Wait for session print("\n[2] Waiting for call pickup (up to 60s)...") session_id = None start = time.time() while time.time() - start < 60: try: ev = json.loads(await asyncio.wait_for(ws.recv(), timeout=2)) print(f" [event] {ev.get('type')}") if ev.get("session_id"): session_id = ev["session_id"] print(f" OK: session = {session_id}") break except asyncio.TimeoutError: pass if not session_id: events = await drain(5.0) for ev in events: if ev.get("session_id"): session_id = ev["session_id"] break if not session_id: print(" FAIL: no session appeared") return # 3. Inject greeting print(f"\n[3] Injecting greeting...") await ws.send(json.dumps({ "type": "inject", "session_id": session_id, "text": GREETING, })) print(" OK: greeting queued (delivers on next turn poll)") await asyncio.sleep(0.5) # 4. Takeover print(f"\n[4] Taking over session {session_id[:12]}...") await ws.send(json.dumps({"type": "takeover", "session_id": session_id})) while True: ev = json.loads(await asyncio.wait_for(ws.recv(), timeout=10)) print(f" [event] {ev.get('type')}") if ev.get("type") == "takeover.ack": print(f" OK: takeover {'succeeded' if ev.get('ok') else 'FAILED'}") if not ev.get("ok"): return break # 5. Handle 3 turns print(f"\n[5] Handling {len(REPLIES)} turns...") turns = 0 while turns < len(REPLIES): try: ev = json.loads(await asyncio.wait_for(ws.recv(), timeout=90)) if ev.get("type") == "turn.request": turns += 1 rid = ev.get("request_id", "") print(f"\n Turn {turns}/{len(REPLIES)}") print(f" Caller: {ev.get('transcript', '')!r}") print(f" Reply: {REPLIES[turns-1]!r}") await ws.send(json.dumps({ "reply": REPLIES[turns - 1], "request_id": rid, })) print(f" Sent (request_id={rid[:8]}...)") else: print(f" [event] {ev.get('type')}") except asyncio.TimeoutError: print(f" TIMEOUT after {turns} turns") break # 6. Release print(f"\n[6] Releasing takeover...") await ws.send(json.dumps({"type": "release", "session_id": session_id})) while True: ev = json.loads(await asyncio.wait_for(ws.recv(), timeout=10)) print(f" [event] {ev.get('type')}") if ev.get("type") == "release.ack": print(f" OK: released, local LLM resumes") break # 7. Observe post-release print(f"\n[7] Observing post-release (30s)...") t0 = time.time() while time.time() - t0 < 30: try: ev = json.loads(await asyncio.wait_for(ws.recv(), timeout=5)) etype = ev.get("type", "") if etype == "turn.complete": model = ev.get("model", ev.get("metrics", {}).get("llm_model", "")) print(f" [turn] model={model} reply={ev.get('reply', '')[:60]!r}") elif etype == "session.ended": print(f" [session ended]") break else: print(f" [event] {etype}") except asyncio.TimeoutError: print(" (quiet)") print("\n[*] Test complete!") if __name__ == "__main__": try: asyncio.run(main()) except KeyboardInterrupt: print("\n[*] Interrupted") except Exception as e: print(f"\n[!] Error: {e}") raise
Running the Test
cd /path/to/gateway python3 test_takeover.py
Expected Output
[*] Connecting to agent WS: ws://127.0.0.1:8996/api/agent/ws [+] Connected [event] agent.connected [1] Dialing +49123456789... [event] dial.ack OK: dial succeeded [2] Waiting for call pickup (up to 60s)... [event] call.dial [event] turn.started OK: session = d56a80fc30dc42b5ab2cecd2484ff847 [3] Injecting greeting... OK: greeting queued (delivers on next turn poll) [4] Taking over session d56a80fc30dc... [event] turn.reply [event] turn.complete [event] agent.inject [event] agent.takeover [event] takeover.ack OK: takeover succeeded [5] Handling 3 turns... [event] turn.started [event] turn.reply <-- this is the injected greeting being delivered [event] turn.complete [event] turn.started [event] turn.transcript Turn 1/3 Caller: "Okay, I'm saying something." Reply: "That's interesting! I heard you clearly. ..." Sent (request_id=36fcc0e4...) [event] turn.reply [event] turn.complete [event] turn.started [event] turn.transcript Turn 2/3 Caller: "Okay, I'm saying something else." Reply: "Got it! That was turn two. ..." Sent (request_id=3582e133...) ...turn 3 similar... [6] Releasing takeover... [event] agent.release [event] release.ack OK: released, local LLM resumes [7] Observing post-release (30s)... [event] turn.reply [turn] model=local/... reply='Hello! How can I help you?' [*] Test complete!
What to Verify (Human)
Greeting: You hear the custom greeting text spoken by the TTS voice Turns 1-3: You speak, and the canned agent replies play back (not the local LLM's responses) Post-release: After turn 3, the next time you speak, the response is clearly different — it's the local LLM's personality/style, not the canned replies Latency: Each turn should complete in 2-8 seconds (ASR + TTS, no LLM inference during takeover) No errors: No timeouts, no dropped turns, no silence gaps
Troubleshooting
SymptomCauseFixdial.ack ok but no session appearsPhone not picking up (DIALER role lost, app not running)Check DIALER role, restart appturn.request never arrivesTakeover didn't register, or phone isn't pollingCheck takeover.ack was ok: true; check phone logsGreeting doesn't playInject arrived after takeover consumed the pollInject BEFORE takeover, add 0.5s delayAgent reply not heardMissing request_id in replyAlways echo back the exact request_id60s timeout on turnAgent reply too slowCheck network, agent processing timeLocal LLM doesn't resume after releaseRelease failedCheck release.ack was ok: truePhone stops picking up callsDIALER role reset (reboot) or USB issueRun post-reboot recovery
Category context
Agent frameworks, memory systems, reasoning layers, and model-native orchestration.
Source: Tencent SkillHub
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- SKILL.md