fix(tracing): inject langfuse_session_id and langfuse_user_id into per-run config metadata#3092
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…r-run config metadata LangfuseCallbackHandler reads langfuse_session_id and langfuse_user_id from the LangChain run metadata dict. By setting these in config["metadata"] before RunnableConfig is built in run_agent(), every per-run trace is automatically grouped by thread and attributed to the correct user in the Langfuse dashboard without any changes to model or callback construction. Closes bytedance#2930 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Problem
Closes #2930
Langfuse traces produced by DeerFlow runs were not grouped by thread or attributed to the requesting user. The
LangfuseCallbackHandlerreadslangfuse_session_idandlangfuse_user_idfrom the LangChain run metadata dict, but neither key was being set anywhere in the run pipeline.Solution
In
run_agent()(runtime/runs/worker.py), immediately before theRunnableConfigis constructed, inject both keys intoconfig["metadata"]:langfuse_session_id→thread_id(groups all runs for a thread into one Langfuse session)langfuse_user_id→runtime_ctx.get("user_id", "")(the user resolved by the gateway and propagated through_build_runtime_context)No changes to model construction, callback factories, or the Langfuse handler itself are required — the handler already picks these values up from the metadata dict.
Test
Added
test_run_agent_injects_langfuse_session_and_user_into_config_metadatatotests/test_run_worker_rollback.py. ADummyAgentcapturesconfig["metadata"]at stream time and the test asserts both keys are present with the correct values.Also fixed a stray assertion that had leaked into the wrong test function in the same file.