Vapi is the Voice AI platform for developers.

Vapi AI

Expected vs Actual Behavior

Expected API Reference output:

{
  "type": "tool",
  "tool": {
    "type": "endCall"
  }
}

Actual buggy output:

{
  "type": "tool", 
  "tool": {}
}

So what I mean: 
The tool does not allow to edit section "NON-EDITEABLE"  
example:  "tool": {NON-EDITEABLE}

Just try for yourself, select "endcall" in the appropriate  section (ToolCallHookAction) and the space between the {} stays empty.

**To configure the `endCall` tool correctly, your output should look like this:**

```json
{
  "type": "tool",
  "tool": {
    "type": "endCall"
  }
}
```

*This matches the expected format shown in the [Vapi documentation](https://docs.vapi.ai/tools/default-tools). If the tool is generating an empty object, please verify your configuration or report this as a bug to support for further assistance.*

Source:
- [Default Tools | Vapi Documentation](https://docs.vapi.ai/tools/default-tools)

where exactly are you trying to edit the assistant hook configuration? could you please provide a screenshot