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MCP Tools Not Showing Up (And No Error to Tell You Why)

That green “connected” badge only means the handshake finished — here’s the one command that shows you what your editor actually sees.

You followed the MCP setup and the client even shows the server 'connected' — but the assistant acts like the tool does not exist, with no error pointing anywhere. The one command that shows what your editor actually sees, demonstrated by building a server with the bug in it on purpose.

Written by Maya Okafor — already drafted, fact-checked and signed off by the editor.