Digging a bit into this, I found this forum post - Tool calling with OpenAI API not working - #5 by Hugo_Lebegue
The issue does seem to be that the tool_call_id is empty.
Related topics
| Topic | Replies | Views | Activity | |
|---|---|---|---|---|
| Tool calling with OpenAI API not working | 6 | 954 | August 12, 2025 | |
| Returning tool / function results over OpenAI API | 6 | 443 | March 8, 2025 | |
| OpenAI compatibility with function calling not response message | 3 | 306 | June 3, 2025 | |
| OpenAI Compatibilioty with JNodeJS - Error | 28 | 851 | May 26, 2025 | |
| BadRequestError (function_response.name empty) when replying to tool_calls with empty id via OpenAI Compatibility Layer | 5 | 349 | June 2, 2025 |