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Cmux Browser

Use this when testing the dashboard with a web client in interactive sessions. Best for testing frontend tools, verifying UI behavior, checking page loads, validating URL routing, or interacting with the browser. Preferred over playwright-testing for interactive work — the browser opens as a visible split pane and results return inline.

amitkot 1fb2fca 1.3 KB Updated
Web & Frontend

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Browser Testing with cmux browser

Test websites and frontend tools using cmux browser.

First Step

Run the help command to discover all available commands:

cmux browser --help

Determining the Target URL

Use the URL appropriate for the current context:

  • Local dev server: Check the project for its dev server port (commonly http://127.0.0.1:8000 or similar)
  • Remote site: Use the URL provided by the user or documented in the project

Key Context

  • cmux browser open <url> returns a surface handle (e.g. surface:14) — use it for all subsequent commands
  • Element refs (e.g. e9, e18) come from snapshot --interactive and change after page mutations — always re-snapshot before interacting
  • When click ref=eNN fails with JS errors, fall back to eval "document.querySelector('...').click()"
  • For large text input, use eval with JS instead of fill/type

amitkot/claude-code-tools/tree/main/browser-testing/skills/cmux-browser commit 1fb2fca978

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