I have connected a MCP to a chat in the prompts dashboard following the instructions here: https://platform.openai.com/docs/mcp#test-and-connect-your-mcp-server. It connects and calls the tools as expected. However, if the tool returns a list, it only considers the first value of the list instead of the whole list.
This breaks the usability of the MCP connection. I tested the exact same remote server in MCP Inspector and the whole list is properly returned by the tool:
I strongly suspect this is an issue with ChatGPT’s implementation of the MCP client, but let me know if there is some other reason for this behaviour.
I appreciate any help on this topic!