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Tip: Design Long-Running MCP Tools Around Claude Code's New 2-Minute Auto-Background Threshold

Claude Code Changelogmedium signal

v2.1.212 now moves any MCP tool call exceeding 2 minutes into the background automatically so the foreground session stays responsive. If you author MCP servers, this changes the contract: long operations should return a handle/poll pattern rather than blocking, and your tool descriptions should assume the agent may continue working before results land. Structure for async completion, not a synchronous return.

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