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I stopped letting my agents guess ports

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Run three Claude Code sessions at once and you know this feeling: the API server was on 3000, now it's on 3001, now something else grabbed 3001 and Vite jumped to 5174. Then an agent curls the wrong port, gets ECONNREFUSED, and confidently starts "fixing" code that was never broken. I kept watching this failure mode in the r/ClaudeCode thread asking how people keep multiple sessions organized (89 points, 157 comments at the time of writing). Lots of session-panel tools. Almost nobody talking about the dumber problem underneath: port numbers are the wrong handle for a service.

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