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Troubleshooting

General tips

  • Run npx arc-devtools-mcp@latest --help to test if the MCP server runs on your machine.
  • Make sure that your MCP client uses the same npm and node version as your terminal.
  • When configuring your MCP client, try using the --yes argument to npx to auto-accept installation prompt.
  • Find a specific error in the output of the arc-devtools-mcp server. Usually, if you client is an IDE, logs would be in the Output pane.

Specific problems

Error [ERR_MODULE_NOT_FOUND]: Cannot find module ...

This usually indicates either a non-supported Node version is in use or that the npm/npx cache is corrupted. Try clearing the cache, uninstalling arc-devtools-mcp and installing it again. Clear the cache by running:

rm -rf ~/.npm/_npx # NOTE: this might remove other installed npx executables.
npm cache clean --force

Target closed error

This indicates that the browser could not be started. Make sure that no Arc instances are running or close them. Make sure you have Arc browser installed from arc.net.

Arc is not available on my platform

Arc browser is currently only available on macOS. Windows and Linux support are planned by the Arc team but not yet available. You can track platform availability at arc.net.