# Updates the name of a **Tool**.

Refer to our [tool use](https://dev.hume.ai/docs/speech-to-speech-evi/features/tool-use#function-calling) guide for comprehensive instructions on defining and integrating tools into EVI.

### Authentication

**X-Hume-Api-Key**  
API Key authentication via header

### Path parameters

**id**  
`string`  
Required  
`format: "uuid"`  
Identifier for a Tool. Formatted as a UUID.

### Request

This endpoint expects an object.

**name**  
`string`  
Required  
Name of the built-in tool to use. Hume supports the following built-in tools:

- **web_search:** enables EVI to search the web for up-to-date information when applicable.
- **hang_up:** closes the WebSocket connection when appropriate (e.g., after detecting a farewell in the conversation).

For more information, see our guide on [using built-in tools](https://dev.hume.ai/docs/speech-to-speech-evi/features/tool-use#using-built-in-tools).

### Response

**Success**