[Bug] Tool call doesn't work in OpenAI chat model integration

[alnzng]

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Description

I'm trying to use OpenAI chat model to make some function calls for my test Agent app, however it seems the tool call function doesn't work in current implementation. The tool call failed with below error message:

pydantic_core._pydantic_core.ValidationError: 2 validation errors for ToolResponseEvent
responses.call_O9kSJDZYTBerHtWVrHWgpJrZ.[key]
  Input should be a valid UUID, invalid character: expected an optional prefix of `urn:uuid:` followed by [0-9a-fA-F-], found `l` at 3 [type=uuid_parsing, input_value='call_O9kSJDZYTBerHtWVrHWgpJrZ', input_type=str]
    For further information visit https://errors.pydantic.dev/2.11/v/uuid_parsing
external_ids.call_O9kSJDZYTBerHtWVrHWgpJrZ.[key]
  Input should be a valid UUID, invalid character: expected an optional prefix of `urn:uuid:` followed by [0-9a-fA-F-], found `l` at 3 [type=uuid_parsing, input_value='call_O9kSJDZYTBerHtWVrHWgpJrZ', input_type=str]
    For further information visit https://errors.pydantic.dev/2.11/v/uuid_parsing

How to reproduce

Add OpenAI chat model in the end-to-end test chat_model_example.py, run it locally.

Version and environment

The latest codes in main branch

Are you willing to submit a PR?

• I'm willing to submit a PR!

[xintongsong]

• main (0.2-snapshot): cb17ba0
• release-0.1: 31d0186