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MCP Server stdout: One console.log Kills the Connection

This story is from 2026-09-12. It is preserved in the archive; the latest stories are on the live feed.

My MCP server connected fine. Tools showed up. I used it for about twelve minutes. Then, in the middle of a tool call, the client dropped the server and refused to bring it back. I had changed one line. I had added console.log("fetching", url) inside a tool handler, because I wanted to see which UR…

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  1. 2026-09-12 04:47 · DEV Community — AI
    MCP Server stdout: One console.log Kills the Connection

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