Passthrough UserId for open ai requests

[kevin-shelaga]

No description provided.

[Copilot]

Pull request overview

This PR implements user ID passthrough functionality for OpenAI API requests to enable better usage tracking and rate limiting. The implementation uses Python's contextvars to pass the user_id through async call chains without modifying function signatures.

Key Changes:

• Introduced a context variable system to store and retrieve user_id across async boundaries
• Modified OpenAI/Azure OpenAI integration to include user_id parameter in API requests when available
• Updated agent executor to set user_id in context from incoming request parameters

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
python/packages/kagent-adk/src/kagent/adk/_context.py	New module providing context variable functions (set_user_id, get_user_id, clear_user_id) for passing user_id through async call chains
python/packages/kagent-adk/src/kagent/adk/models/_openai.py	Modified generate_content_async to retrieve user_id from context and pass it to OpenAI API (applies to both OpenAI and Azure OpenAI)
python/packages/kagent-adk/src/kagent/adk/_agent_executor.py	Updated _handle_request to set user_id in context from run_args and ensure cleanup after request processing
python/packages/kagent-adk/tests/unittests/test_context.py	New test file with comprehensive coverage of context variable functionality including async isolation tests
python/packages/kagent-adk/tests/unittests/models/test_openai.py	Added 6 new test cases covering user passthrough for OpenAI, Azure OpenAI, streaming mode, and edge cases (empty/whitespace user_id)

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[supreme-gg-gg]

It seems like the chat completions API is deprecating the user's field https://platform.openai.com/docs/api-reference/chat

user: This field is being replaced by `safety_identifier` and `prompt_cache_key`. Use
              `prompt_cache_key` instead to maintain caching optimizations. A stable
              identifier for your end-users. Used to boost cache hit rates by better bucketing
              similar requests and to help OpenAI detect and prevent abuse.
              [Learn more](https://platform.openai.com/docs/guides/safety-best-practices#safety-identifiers).