feat(langgraph): retain completed checkpoint fork authority - #1156
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blove
enabled auto-merge (squash)
September 24, 2026 17:45
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The private LangGraph session can now submit new input from an exact completed root checkpoint. It retains the resulting position across later submissions, loads, dynamic-pause responses, reconnects, tool continuations and serialized result writes, so another writer advancing the thread tip cannot redirect its work.
Checkpoint authority requires the owned physical run and its exact persisted state. Uncertain acknowledgments retain staged results without retrying. Consumed pauses and contradictory tool evidence block further effects. Branch-local settled executor facts survive loads without treating historical ToolMessages as completion proof. The contributor README documents single-request transport obligations and the remaining cross-client resume race.
Validation:
This is a private runtime capability, with no public package-root migration, replay API, historical pending-tool execution, or release.