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LangGraph Platform's V3 run endpoint copies transport configuration into runtime context when no application context was supplied. The standard
CopilotKitMiddlewarethen serializes__event_streaming_v2and the transportthread_idinto the model's App Context system prompt.Filter these two fields at the production runtime-context fallback before either model-call path builds the prompt. Explicit CopilotKit context retains precedence, application context survives, and ordinary dictionaries without the Platform marker retain their
thread_id. Runtime and message state are not mutated.Validation: eight regression cases exercise the public middleware import through sync and async model handlers (four failed before the fix). Full Python SDK suite: 250 passed, 11 skipped. Built the wheel, installed it to an isolated target, and ran all 99 middleware tests against that distribution. Repository commit hooks passed.
Companion to ag-ui-protocol/ag-ui#2830. AG-UI's transformer compatibility lane must test this production package commit; ordinary PyPI installations remain affected until this fix is merged and a Python SDK release is published. No release or merge is included in this PR.