Description
🐛 Incident Report: BadRequestError from OpenAI Agent SDK
📄 Summary
While executing a synchronous agent run using Runner.run_sync(), the following error was encountered:
openai.BadRequestError: Error code: 400 - {'error': {'message': "Invalid schema for function 'process_user': In context=(), 'additionalProperties' is required to be supplied and to be false.", ...}}
🔍 Root Cause
The error originates from the OpenAI Agents SDK when trying to validate the function schema (tools[0].parameters) passed to the model. Specifically:
"Invalid schema for function 'process_user': In context=(), 'additionalProperties' is required to be supplied and to be false."
Explanation:
-
When defining a tool (function) schema in the Agent SDK, the parameters must follow strict JSON Schema rules.
-
The schema is missing the required property:
"additionalProperties": false
-
Without this, OpenAI cannot validate the input contract and throws a 400 Bad Request error.
📌 Action Items
- Review the tool schema for
process_user - Ensure proper JSON Schema generation with
additionalProperties: false - Re-test with
Runner.run_sync()
💡 Tip
Use a JSON Schema validator (like https://jsonschemavalidator.net/) to confirm your function schema before registering it in the SDK.
Let me know if you'd like me to inspect your tool definition and rewrite it properly with the correct schema!