Browser Automation

The cmux browser command group provides browser automation against cmux browser surfaces. Use it to navigate, interact with DOM elements, inspect page state, evaluate JavaScript, and manage browser session data.

Command Index

Category	Subcommands
Navigation and targeting	`identify`, `open`, `open-split`, `navigate`, `back`, `forward`, `reload`, `url`, `focus-webview`, `is-webview-focused`
Waiting	`wait`
DOM interaction	`click`, `dblclick`, `hover`, `focus`, `check`, `uncheck`, `scroll-into-view`, `type`, `fill`, `press`, `keydown`, `keyup`, `select`, `scroll`
Inspection	`snapshot`, `screenshot`, `get`, `is`, `find`, `highlight`
JavaScript and injection	`eval`, `addinitscript`, `addscript`, `addstyle`
Frames, dialogs, downloads	`frame`, `dialog`, `download`
State and session data	`cookies`, `storage`, `state`
Tabs and logs	`tab`, `console`, `errors`

Targeting a browser surface

Most subcommands require a target surface. You can pass it positionally or with --surface.

# Open a new browser split
cmux browser open https://example.com

# Discover focused IDs and browser metadata
cmux browser identify
cmux browser identify --surface surface:2

# Positional vs flag targeting are equivalent
cmux browser surface:2 url
cmux browser --surface surface:2 url

Navigation

cmux browser open https://example.com
cmux browser open-split https://news.ycombinator.com

cmux browser surface:2 navigate https://example.org/docs --snapshot-after
cmux browser surface:2 back
cmux browser surface:2 forward
cmux browser surface:2 reload --snapshot-after
cmux browser surface:2 url

cmux browser surface:2 focus-webview
cmux browser surface:2 is-webview-focused

Waiting

Use wait to block until selectors, text, URL fragments, load state, or a JavaScript condition is satisfied.

cmux browser surface:2 wait --load-state complete --timeout-ms 15000
cmux browser surface:2 wait --selector "#checkout" --timeout-ms 10000
cmux browser surface:2 wait --text "Order confirmed"
cmux browser surface:2 wait --url-contains "/dashboard"
cmux browser surface:2 wait --function "window.__appReady === true"

DOM Interaction

Mutating actions support --snapshot-after for fast verification in scripts.

cmux browser surface:2 click "button[type='submit']" --snapshot-after
cmux browser surface:2 dblclick ".item-row"
cmux browser surface:2 hover "#menu"
cmux browser surface:2 focus "#email"
cmux browser surface:2 check "#terms"
cmux browser surface:2 uncheck "#newsletter"
cmux browser surface:2 scroll-into-view "#pricing"

cmux browser surface:2 type "#search" "cmux"
cmux browser surface:2 fill "#email" --text "ops@example.com"
cmux browser surface:2 fill "#email" --text ""
cmux browser surface:2 press Enter
cmux browser surface:2 keydown Shift
cmux browser surface:2 keyup Shift
cmux browser surface:2 select "#region" "us-east"
cmux browser surface:2 scroll --dy 800 --snapshot-after
cmux browser surface:2 scroll --selector "#log-view" --dx 0 --dy 400

Inspection

Use structured getters for scripts and snapshots/screenshots for human review.

cmux browser surface:2 snapshot --interactive --compact
cmux browser surface:2 snapshot --selector "main" --max-depth 5
cmux browser surface:2 screenshot --out /tmp/cmux-page.png

cmux browser surface:2 get title
cmux browser surface:2 get url
cmux browser surface:2 get text "h1"
cmux browser surface:2 get html "main"
cmux browser surface:2 get value "#email"
cmux browser surface:2 get attr "a.primary" --attr href
cmux browser surface:2 get count ".row"
cmux browser surface:2 get box "#checkout"
cmux browser surface:2 get styles "#total" --property color

cmux browser surface:2 is visible "#checkout"
cmux browser surface:2 is enabled "button[type='submit']"
cmux browser surface:2 is checked "#terms"

cmux browser surface:2 find role button --name "Continue"
cmux browser surface:2 find text "Order confirmed"
cmux browser surface:2 find label "Email"
cmux browser surface:2 find placeholder "Search"
cmux browser surface:2 find alt "Product image"
cmux browser surface:2 find title "Open settings"
cmux browser surface:2 find testid "save-btn"
cmux browser surface:2 find first ".row"
cmux browser surface:2 find last ".row"
cmux browser surface:2 find nth 2 ".row"

cmux browser surface:2 highlight "#checkout"

JavaScript Eval and Injection

cmux browser surface:2 eval "document.title"
cmux browser surface:2 eval --script "window.location.href"

cmux browser surface:2 addinitscript "window.__cmuxReady = true;"
cmux browser surface:2 addscript "document.querySelector('#name')?.focus()"
cmux browser surface:2 addstyle "#debug-banner { display: none !important; }"

State

Session data commands cover cookies, local/session storage, and full browser state snapshots.

cmux browser surface:2 cookies get
cmux browser surface:2 cookies get --name session_id
cmux browser surface:2 cookies set session_id abc123 --domain example.com --path /
cmux browser surface:2 cookies clear --name session_id
cmux browser surface:2 cookies clear --all

cmux browser surface:2 storage local set theme dark
cmux browser surface:2 storage local get theme
cmux browser surface:2 storage local clear
cmux browser surface:2 storage session set flow onboarding
cmux browser surface:2 storage session get flow

cmux browser surface:2 state save /tmp/cmux-browser-state.json
cmux browser surface:2 state load /tmp/cmux-browser-state.json

Tabs

Browser tab operations map to browser surfaces in the active browser tab group.

cmux browser surface:2 tab list
cmux browser surface:2 tab new https://example.com/pricing

# Switch by index or by target surface
cmux browser surface:2 tab switch 1
cmux browser surface:2 tab switch surface:7

# Close current tab or a specific target
cmux browser surface:2 tab close
cmux browser surface:2 tab close surface:7

Console and Errors

cmux browser surface:2 console list
cmux browser surface:2 console clear

cmux browser surface:2 errors list
cmux browser surface:2 errors clear

Dialogs

cmux browser surface:2 dialog accept
cmux browser surface:2 dialog accept "Confirmed by automation"
cmux browser surface:2 dialog dismiss

Frames

# Enter an iframe context
cmux browser surface:2 frame "iframe[name='checkout']"
cmux browser surface:2 click "#pay-now"

# Return to the top-level document
cmux browser surface:2 frame main

Downloads

cmux browser surface:2 click "a#download-report"
cmux browser surface:2 download --path /tmp/report.csv --timeout-ms 30000

Common Patterns

Navigate, wait, inspect

cmux browser open https://example.com/login
cmux browser surface:2 wait --load-state complete --timeout-ms 15000
cmux browser surface:2 snapshot --interactive --compact
cmux browser surface:2 get title

Fill a form and verify success text

cmux browser surface:2 fill "#email" --text "ops@example.com"
cmux browser surface:2 fill "#password" --text "$PASSWORD"
cmux browser surface:2 click "button[type='submit']" --snapshot-after
cmux browser surface:2 wait --text "Welcome"
cmux browser surface:2 is visible "#dashboard"

Capture debug artifacts on failure

cmux browser surface:2 console list
cmux browser surface:2 errors list
cmux browser surface:2 screenshot --out /tmp/cmux-failure.png
cmux browser surface:2 snapshot --interactive --compact

Persist and restore browser session

cmux browser surface:2 state save /tmp/session.json
# ...later...
cmux browser surface:2 state load /tmp/session.json
cmux browser surface:2 reload