Tag

#agent-debugging

15 posts tagged.

MCP Error -32000 Connection Closed: What It Actually Means (2026)

MCP error -32000: Connection closed is generated inside the client SDK and is never sent by a server. It means your MCP server process died. Here is how to recover the real error, and a measured correction to the stdout advice (2026).

August 27, 202610 min read234

Tutorials

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 read359

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 read486