LangGraph 1.2.0 Ships Per-Node Timeouts, Node-Level Error Handlers, and DeltaChannel — Cuts Checkpoint Overhead for Long-Running Agent Threads

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LangGraph 1.2.0 (May 12) adds three production-critical features. Per-node TimeoutPolicy lets you set wall-clock or idle limits that raise NodeTimeoutError and hand off to retry policy. Node-level error handlers run recovery functions after retries are exhausted and can return a Command to update state and route to a different node — enabling graceful degradation without crashing the graph. DeltaChannel (beta) stores only incremental deltas at each step instead of re-serializing the full value, directly addressing checkpoint bloat in long-running threads with large message lists. Timeouts and error handlers are Python-only; retry policies work in both Python and TypeScript.