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Your MCP server works in the terminal but not in Claude Desktop or Cursor: 7 causes

This story is from 2026-10-11. It is preserved in the archive; the latest stories are on the live feed.

You run your MCP server by hand, it starts, nothing crashes. You add it to Claude Desktop, Cursor or another client and it shows up red, "failed", or connects and then no tool works. Almost always the server is fine. The difference is the environment the client launches it in. These are the seven c…

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  1. 2026-10-11 06:23 · DEV Community — AI
    Your MCP server works in the terminal but not in Claude Desktop or Cursor: 7 causes

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