Function●Since v0.0

build_stream_config

build_stream_config(
  thread_id: str,
  assistant_id: str | None,
  *,
  sandbox_type: str

Parameters

Build the LangGraph stream config dict.

Injects CLI and SDK versions into metadata["versions"] so LangSmith traces can be correlated with specific releases.

Why the CLI sets both versions:

create_deep_agent bakes versions: {"deepagents": "X.Y.Z"} into the compiled graph via with_config. At stream time, LangGraph merges the graph config with the runtime config passed here. Because the metadata merge is shallow (effectively {**graph_meta, **runtime_meta} for top-level keys), both configs containing a versions key means the runtime dict replaces the graph dict entirely — the SDK version would be lost.
Including the SDK version here ensures it survives the merge.

Includes ls_integration metadata so LangSmith traces originating from the CLI are distinguishable from bare SDK usage.