Fix: Remove optional union in WeatherSanitizer schema to resolve BadRequestError

[Awaisprogram]

This PR updates the WeatherSanitizer Pydantic model by removing the str | None = None type annotation from the reason field.

Problem

When running Runner.run with the WeatherSanitizer agent, the following error occurred:

openai.BadRequestError: Error code: 400 - [{'error': {'code': 400, 'message': "Unable to submit request because one or more response schemas didn't specify the schema type field."}}]

The issue is caused by the reason: str | None = None definition, which generates a schema without the expected "type" field, making it incompatible with the response schema validator used by the Agents SDK.

Solution

Changed the field definition from:

reason: str | None = None

to

reason: str

Result

• Fixes the BadRequestError when running the agent.
• Ensures that the schema generated for WeatherSanitizer includes a valid type.