Browser Automation with cmux

Use this skill for browser tasks inside cmux webviews.

Core Workflow

1. Open or target a browser surface.
2. Verify navigation with get url before waiting or snapshotting.
3. Snapshot (--interactive) to get fresh element refs.
4. Act with refs (click, fill, type, select, press).
5. Wait for state changes.
6. Re-snapshot after DOM/navigation changes.

cmux --json browser open https://example.com
# use returned surface ref, for example: surface:7