### Payload

The payload of this webhook request is an object.

- **chat_group_id**: Unique ID of the **Chat Group** associated with the **Chat** session.
- **chat_id**: Unique ID of the **Chat** session.
- **config_id**: Unique ID of the EVI **Config** used for the session.
- **caller_number**: Phone number of the caller in E.164 format (e.g., `+12223333333`). This field is included only if the Chat was created via the [Twilio phone calling](https://dev.hume.ai/docs/empathic-voice-interface-evi/phone-calling) integration.
- **custom_session_id**: User-defined session ID. Relevant only when employing a [custom language model](https://dev.hume.ai/docs/empathic-voice-interface-evi/custom-language-model) in the EVI Config.
- **timestamp**: Unix timestamp (in milliseconds) indicating when the tool call was triggered.
- **tool_call_message**: The tool call.

**Twilio metadata**:  
- **twilio_metadata**: Twilio metadata associated with the chat. This field is included only if the Chat was created via the [Twilio phone calling](https://dev.hume.ai/docs/empathic-voice-interface-evi/phone-calling) integration. Fields may include `call_sid`, `account_sid`, `from_number`, `to_number`, `caller_name`, `caller_number`, `from_city`, `from_state`, `from_zip`, `from_country`, `to_city`, `to_state`, `to_zip`, and `to_country`. If a specific metadata is not available, this field will be set to an empty string.

- **event_name**: Always `tool_call`.

### Response

- **200**: Return a 200 status to indicate that the data was received successfully.