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Tool outputs have to be strings apparently. Ensure they are formatted
correctly before passing as intermediate steps.
```
BadRequestError: Error code: 400 - {'error': {'message': '1 validation error for Request\nbody -> tool_outputs -> 0 -> output\n str type expected (type=type_error.str)', 'type': 'invalid_request_error', 'param': None, 'code': None}}
```