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#agent-debugging

2 posts tagged.

LangGraph InvalidUpdateError: Fix "Can Receive Only One Value Per Step" (2026)

InvalidUpdateError: Can receive only one value per step means two parallel LangGraph nodes wrote the same state key with no reducer. Reproduce it in 15 lines and fix it the right way in Python and TypeScript (2026).

August 16, 20268 min read85

Tutorials

LangGraph Recursion Limit: Fix GraphRecursionError Properly (2026)

GraphRecursionError means you hit LangGraph's 25-superstep recursion limit. Raise it the right way, find the real infinite loop, and exit gracefully with RemainingSteps.

July 30, 20265 min read171