---
title: "Stop leftover MCP servers and AI helpers on a Mac · MacMelon"
description: "AI coding tools start MCP servers and dev servers that can keep running after you close them. Sentinely finds the leftovers and stops them after you review."
url: "https://macmelon.com/use-cases/stop-leftover-ai-helpers-and-mcp-servers"
---

# Stop AI-tool helpers left running after you close your editor

AI coding tools start MCP servers for every session. When the tool closes, some keep running with nothing connected. Sentinely finds them and stops them after you review.

AI coding tools such as Claude Code and Cursor start [MCP servers](https://macmelon.com/glossary/mcp-server) as helper processes, often one copy per session. When the tool or its terminal closes, some of those helpers keep running with nothing connected to them. Dev servers and code helpers started from a closed terminal can do the same.

[Sentinely](https://macmelon.com/apps/sentinely) looks for MCP servers whose AI app has closed, duplicate copies of the same server started by the same app, idle AI coding sessions, and dev servers whose terminal or editor window is gone. It shows each group with an estimate and stops them after you review.

## Steps

1.  ### Run the check after a long session

    Leftovers build up over a day of opening and closing sessions. Sentinely groups them by what started them, so you see "AI-tool helpers left running" rather than a list of process IDs.

2.  ### Review what will stop

    Sentinely shows the helpers it will stop. For duplicates, the newest copy of each server stays running. Command lines are redacted on the Mac before Sentinely shows anything, because they can contain API keys and tokens.

3.  ### Stop them and read the receipt

    Sentinely re-checks each process just before acting, stops only your own processes, and measures what came back at ten seconds and one minute.

4.  ### Let Autopilot handle it next time

    With Pro, you can let Autopilot stop helpers left behind by closed AI apps when memory gets tight. It only stops helpers you have already stopped once by hand.

## Before you start

-   If an AI tool is still running a task, finish or cancel it first. Sentinely looks for helpers whose app has closed, but you know what you still need.
-   A supervisor or launch agent may start a helper again. If one keeps coming back, the setting that starts it lives in that tool.

## Questions

Does Sentinely read my prompts or code?

No. It reads process names, paths, and command lines to tell a leftover helper from a working one. Command lines are redacted on the Mac, never stored, and never sent anywhere.

Which AI tools does this cover?

Any app that starts MCP servers as local processes. Sentinely recognizes the servers themselves, so it does not need a list of supported tools for this finding.

## Apps

[No more Force Quit in the middle of a build. ### Sentinely](https://macmelon.com/apps/sentinely)

## Related guides

[### How to find what's slowing down your Mac](https://macmelon.com/guides/how-to-find-what-is-slowing-down-your-mac)

## Related use cases

[### When VS Code or Cursor slows your Mac](https://macmelon.com/use-cases/vs-code-or-cursor-slowing-your-mac)[### Get memory back from local AI models and Docker Desktop](https://macmelon.com/use-cases/get-memory-back-from-ollama-and-docker)

## Related terms

[A helper program that gives an AI app access to a tool or data source, often running as a separate process on your Mac. ### MCP server](https://macmelon.com/glossary/mcp-server)[The memory macOS charges to a process, including memory it has compressed. Sentinely's unit for estimates and receipts. ### Memory footprint](https://macmelon.com/glossary/memory-footprint)[Sentinely's record of a fix: what was freed and what changed for you, measured after the fix rather than promised before it. ### Measured receipt](https://macmelon.com/glossary/measured-receipt)[Watched-folder cleanup in Disk Housekeeper, still behind a preview. In Sentinely, the memory fixes you have approved. ### Autopilot](https://macmelon.com/glossary/autopilot)

## Related notes

[Empty memory is not the goal, and a number we cannot measure is not a result. The rules behind Sentinely's fixes and its measured receipts. ### Why Sentinely won't "free your RAM"](https://macmelon.com/blog/why-sentinely-wont-free-your-ram)