[Playground/Evals] How can I generate an output when a tool is invoked?

Hi, I’m currently trying to get the output column in eval/datasets to output something so that I can run the grader through it.

However, I can’t seem to get the assistant to actually output something after a tool call was invoked. So when I run the grader, it will error out because output is not present.

Things I’ve tried (same issue for all):

  • Defining custom tools
  • Adding function calls
  • Connecting to custom mcp server (current)

Wondering if this is a bug or if anyone have any ideas on how can I resolve this?