i have a tool:

{
  "id": "71276008-3da2-48c6-bc80-31b3b9d0d63d",
  "createdAt": "2025-06-14T20:16:34.394Z",
  "updatedAt": "2025-08-05T18:00:45.226Z",
  "type": "function",
  "function": {
    "name": "search_patient",
    "strict": true,
    "parameters": {
      "type": "object",
      "properties": {
        "phone": {
          "description": "",
          "type": "string"
        },
        "full_name": {
          "description": "",
          "type": "string"
        }
      },
      "required": []
    }
  },
  "messages": [
    {
      "role": "assistant",
      "type": "request-complete",
      "content": "I have found patient {{full_name}}. The phone number is: {{phone}}. Do you want to schedule an appointment?",
      "conditions": [
        {
          "param": "phone",
          "value": "\"\"",
          "operator": "neq"
        }
      ],
      "endCallAfterSpokenEnabled": false
    },
    {
      "type": "request-start",
      "content": "Please wait a second, i am checking our database for the patient called {{full_name}}",
      "blocking": false,
      "conditions": [
        {
          "param": "full_name",
          "value": "\"\"",
          "operator": "neq"
        }
      ]
    },
    {
      "type": "request-response-delayed",
      "content": "I am facing some delay, sorry for that.",
      "timingMilliseconds": 1000
    }
  ],
  "orgId": "577d690d-6bc1-40e5-ba66-2baad1505f3f",
  "async": false
}

i am getting tool call request: search_patient

(call_id=call_rnm9I0v5U6A8NUsWn4OwTHhc): {"full_name": "Xxx"}

And i am sending answer:

{'results': [{'toolCallId': 'call_rnm9I0v5U6A8NUsWn4OwTHhc', 'result': {'full_name': 'Xxx', 'phone': 'Yyy'}}]}}

i use function to create and sent tool call snawer:

async def handle_tool_call(ws, tool_call):
    import uuid

    call_id = tool_call["id"]
    tool_name = tool_call["function"]["name"]
    args = json.loads(tool_call["function"].get("arguments", "{}") or "{}")

    result = {}

    try:
        if tool_name == "search_patient":
            r = requests.get("https://scheduling-test.vercel.app/patients/search", params=args)
            if r.ok and r.text.strip():
                d = r.json()
                user_data.update({
                    "user_id": d.get("user_id"),
                    "full_name": d.get("full_name"),
                    "phone": d.get("phone")
                })
                result = {
                    "full_name": d.get("full_name"),
                    "phone": d.get("phone")
                }
                payload_data = {
                    "user_id": user_data["user_id"],
                    "datetime": f"{args.get('date')} {args.get('time')}",
                    "appointment_type": appointment_type,
                    "full_name": user_data.get("full_name"),
                    "phone": user_data.get("phone")
                }
                r = requests.post("https://scheduling-test.vercel.app/appointments/create", json=payload_data)
                data = r.json()
                if data.get("status") == "success":
                    result = {
                        "full_name": user_data["full_name"],
                        "date": args.get("date"),
                        "time": args.get("time"),
                        "appointment_type": appointment_type
                    }

        else:
            print(f"Unknown tool: {tool_name}")

    except Exception as e:
        print(f"Error in {tool_name}: {e}")
        result = {}

    payload = {
        "results": [{
            "toolCallId": call_id,
            "result": result
        }]
    }
    await ws.send(json.dumps(payload))

and the call transcription is:

{
  "role": "bot",
  "time": 1754416697157,
  "source": "",
  "endTime": 1754416701547,
  "message": "Thank you for calling Vera Dental of Riverton. Uh, this is Robin, your health care coordinator.",
  "duration": 4310,
  "secondsFromStart": 0.79999995
}
{
  "role": "user",
  "time": 1754416702906.9998,
  "endTime": 1754416706257,
  "message": "Hi. Please provide me with the information about patient Max.",
  "duration": 3060.000244140625,
  "secondsFromStart": 6.5499997
}
{
  "role": "bot",
  "time": 1754416707746.999,
  "source": "",
  "endTime": 1754416710007,
  "message": "Please wait a second. I am checking our database.",
  "duration": 2260.0009765625,
  "secondsFromStart": 11.389999
}
{
  "role": "tool_calls",
  "time": 1754416708120,
  "message": "",
  "toolCalls": [
    {
      "id": "call_rnm9I0v5U6A8NUsWn4OwTHhc",
      "type": "function",
      "function": {
        "name": "search_patient",
        "arguments": "{\"full_name\": \"Max\"}"
      }
    }
  ],
  "secondsFromStart": 9.858
}
{
  "role": "bot",
  "time": 1754416710927.001,
  "source": "",
  "endTime": 1754416711767,
  "message": "For the patient called",
  "duration": 839.9990234375,
  "secondsFromStart": 14.570001
}
{
  "name": "search_patient",
  "role": "tool_call_result",
  "time": 1754416713018,
  "result": "No result returned.",
  "toolCallId": "call_rnm9I0v5U6A8NUsWn4OwTHhc",
  "secondsFromStart": 14.756
}
{
  "role": "bot",
  "time": 1754416713687,
  "source": "",
  "endTime": 1754416722717,
  "message": "I'm sorry, but I couldn't find any information for a patient named Max in our records. Could you please provide a full name or a phone number for more accurate results?",
  "duration": 8470,
  "secondsFromStart": 17.33
}

so the assistant still doesnt get any tool call answer from my API. I have spent several months and this problem and dont know what to do, pls help me. I can send full script of my api

try this script import asyncio, requests, json, sounddevice as sd, numpy as np, websockets API_KEY = "Bearer af15582f-034d-41f2-8086-78a02df86b84" ASSISTANT_ID = "b0f78268-f43c-426f-a341-fa2544f1b46d" SR = 16000 def create_call(): resp = requests.post( "https://api.vapi.ai/call", headers={"Authorization": API_KEY, "Content-Type": "application/json"}, json={ "assistantId": ASSISTANT_ID, "transport": { "provider": "vapi.websocket", "audioFormat": { "format": "pcm_s16le", "container": "raw", "sampleRate": SR } }, "assistantOverrides": { "variableValues": { "full_name": "", "phone": "", "date": "", "time": "", "appointment_type": "" } } } ) if not resp.ok: print("Failed to create call:", resp.text) return None return resp.json()["transport"]["websocketCallUrl"]

async def handle_tool_call(ws, tool_call): tool_id = tool_call["id"] name = tool_call["function"]["name"] args = json.loads(tool_call["function"].get("arguments", "{}") or "{}") print("Tool call received:", name, args) # Just return dummy data for now to verify response works if name == "search_patient": result = { "full_name": "Max Taylor", "phone": "1234567890" } else: result = {} payload = { "results": [{ "toolCallId": tool_id, "result": result }] } print("Sending tool result:", payload) await ws.send(json.dumps(payload)) async def stream_call(ws_url): async with websockets.connect(ws_url) as ws: print("WebSocket connected!") async def recv_loop(): async for msg in ws: data = json.loads(msg) role = data.get("role") if role == "tool_calls": for call in data["toolCalls"]: await handle_tool_call(ws, call) elif role == "bot": print("BOT:", data["message"]) elif role == "user": print("USER:", data["message"]) elif role == "tool_call_result": print("TOOL RESULT ACK:", data) async def send_audio(): def callback(indata, frames, time, status): if status: print("Input error:", status) ws.send(indata.tobytes()) # send raw audio with sd.InputStream(channels=1, samplerate=SR, dtype='int16', callback=callback): await asyncio.Future() # run forever or until user stops await asyncio.gather(recv_loop()) if __name__ == "__main__": ws_url = create_call() if ws_url: asyncio.run(stream_call(ws_url)) else: print("No call started.")

Also your script doesnt have any fuctionality for me to answer assistant so i cant trigger tool with my voice and i cant even trigger conversation

call id for fixed version of your code: 093a39f3-0960-4e41-b455-0a9f3861e4a5 i triggered tool call but no proper result in the transcription: in the message.txt no information about tool response, so how should them work? https://cdn.discordapp.com/attachments/1402394550307262597/1405156799795167344/message.txt?ex=689dcdbf&is=689c7c3f&hm=f9e5e7f64fd607e44f4a38c1b0c25575595c62f3d0a5088f3d85f78f565883a5&