The new_stream function retrieves run_name at line 1020 but never sets SPANDATA.GEN_AI_AGENT_NAME on the span, unlike new_invoke which correctly sets it (line 967-968). This is an oversight in the refactoring - the old code had span.set_data(SPANDATA.GEN_AI_AGENT_NAME, agent_name) which was removed but not replaced. This breaks parity between streaming and non-streaming agent invocations and conflicts with the PR's stated goal to set agent name as gen_ai.agent.name.

The PR adds logic to extract lc_agent_name from kwargs.get("metadata") in on_chat_model_start, but the test file shows no tests for this feature. The skill instructions state that every PR should have appropriate test coverage. Without tests, it's unclear if the agent name extraction works correctly when metadata is present, absent, or contains an invalid type.