MacOS 26: Local MCP tools stopped working

Bug Reports
1

Describe the Bug

after one of the recent releases of Cursor OR the upgrade to MacOS 26 dev preview, all the local MCPs stopped spinning up their servers and connecting. MCPs overall haven’t been very reliable, but neither window reload nor complete cursor reboot help. Remote MCPs added by url work though. Cursor has permission to run in background (though not sure how it spins MCPs and if Mac has become stricter regarding those child processes)

Steps to Reproduce

{
  "mcpServers": {
    "context7-remote": {
      "url": "https://mcp.context7.com/mcp"
    },
    "context7-local": {
      "command": "npx",
      "args": ["-y", "@upstash/context7-mcp"]
    }
  }
}

Expected Behavior

local MCPs work and get connected

Screenshots / Screen Recordings

Screenshot 2025-07-11 at 18.07.49.png
Screenshot 2025-07-11 at 18.07.49.png832×260 12.9 KB

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.2.4
VSCode Version: 1.99.3
Commit: a8e95743c5268be73767c46944a71f4465d05c90
Date: 2025-07-10T16:53:59.659Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin arm64 25.0.0

Does this stop you from using Cursor

No - Cursor works, but with this issue