| name | web-browser |
| description | Use when interacting with web pages that require real browser behavior: JavaScript execution, clicking, form filling, navigation, screenshots, cookie-dialog handling, authenticated browser sessions, mobile/device emulation, console/error inspection, or network debugging. Do not use for ordinary web search, static/public URL fetching, simple HTTP requests, downloads, or APIs; use web-search or direct HTTP tools instead. |
| compatibility | ["Chrome or Chromium installed","Node.js available"] |
| allowed-tools | ["bash","read"] |
Web Browser Skill
Use the bundled Chrome DevTools Protocol (CDP) scripts for interactive or JavaScript-dependent web browsing.
Run commands from this skill directory. If your current working directory is elsewhere, use the absolute path to the relevant script.
Prefer web-search or direct HTTP tools for ordinary web search, static/public URL fetching, simple downloads, and non-interactive API calls. Use this skill when browser behavior matters: JavaScript rendering, cookies, authenticated browser state, forms, clicks, screenshots, mobile emulation, console logs, or network inspection.
Success criteria: The browsing task uses the simplest reliable tool, and browser scripts are used only when browser behavior is required.
Start Chrome
Start a managed Chrome or Chromium instance with remote debugging enabled:
./scripts/start.js
./scripts/start.js --profile
./scripts/start.js --reset-profile
./scripts/start.js --headless
./scripts/start.js --stop
Use the default debugging port :9222 unless you need a different endpoint.
Profile behavior:
- Default mode uses:
~/.cache/agent-web/browser/fresh-profile
--profile mode uses: ~/.cache/agent-web/browser/profile-copy- The skill does not attach to a live Chrome profile directly.
- If
:9222 is already used by an unknown instance, startup fails instead of reusing it.
Set a custom Chrome or Chromium binary when it is installed in a non-standard location:
BROWSER_BIN=/path/to/chrome ./scripts/start.js
Override the debug endpoint when the default port is unavailable:
BROWSER_DEBUG_PORT=9333 ./scripts/start.js
Success criteria: Chrome is running with CDP available on the configured port, or the failure has a clear next step such as setting BROWSER_BIN, changing BROWSER_DEBUG_PORT, or resetting the managed profile.
Navigate
Navigate the active tab or open a new tab:
./scripts/nav.js https://example.com
./scripts/nav.js https://example.com --new
After navigating, dismiss cookie dialogs when they block interaction, then inspect the page with JavaScript, screenshots, or logs as needed.
Success criteria: The requested URL is loaded in the intended tab and the page is ready for the next interaction or inspection step.
Device Emulation (Mobile)
List, apply, or reset active device emulation preferences:
./scripts/emulate.js --list
./scripts/emulate.js iphone-14
./scripts/emulate.js pixel-7 --landscape
./scripts/emulate.js --reset
Use device emulation to set viewport, DPR, touch behavior, and user agent for browser skill commands. Run --reset when the task should return to desktop behavior.
Commands such as nav.js, eval.js, pick.js, dismiss-cookies.js, and screenshot.js automatically apply the active preference.
Success criteria: The intended device preset is active for subsequent commands, or emulation is reset when no longer needed.
Evaluate JavaScript
Execute JavaScript in the active tab:
./scripts/eval.js 'document.title'
./scripts/eval.js 'document.querySelectorAll("a").length'
./scripts/eval.js 'JSON.stringify(Array.from(document.querySelectorAll("a")).map(a => ({ text: a.textContent.trim(), href: a.href })).filter(link => !link.href.startsWith("https://")))'
Use single quotes around the JavaScript argument to reduce shell escaping issues. Keep snippets focused and return serializable values when you need structured output.
Success criteria: The script runs in the active tab and returns the expected value or a useful error for the next debugging step.
Screenshot
Capture the current viewport, full page, or a temporary device-specific view:
./scripts/screenshot.js
./scripts/screenshot.js --full-page
./scripts/screenshot.js --device iphone-14
./scripts/screenshot.js --device pixel-7 --full-page
Use --full-page when layout below the fold matters. Use --device <preset> when you need a one-off mobile screenshot without changing the active emulation preference.
Success criteria: The command returns a readable screenshot file path that captures the relevant page state.
Pick Elements
Use the interactive element picker when selectors are unclear or visual selection is faster:
./scripts/pick.js "Click the submit button"
Click to select an element, Cmd/Ctrl+Click to select multiple elements, and press Enter to finish.
Success criteria: The target element or elements are selected accurately enough to support the next action or selector-based inspection.
Dismiss Cookie Dialogs
Dismiss cookie consent dialogs after navigating to a page:
./scripts/dismiss-cookies.js
./scripts/dismiss-cookies.js --reject
Run it immediately after navigation when a consent dialog blocks the page:
./scripts/nav.js https://example.com && ./scripts/dismiss-cookies.js
Prefer --reject when the task does not require accepting optional cookies.
Success criteria: The cookie dialog no longer blocks page interaction, or the command reports that no supported dialog was found.
Quick Mobile Debug Flow
Use this sequence for a first pass at mobile layout or interaction issues:
./scripts/start.js
./scripts/nav.js https://example.com
./scripts/emulate.js iphone-14
./scripts/nav.js https://example.com
./scripts/dismiss-cookies.js
./scripts/screenshot.js --full-page
Reload after setting mobile emulation so the page receives the mobile user agent during initial load.
Success criteria: The page is loaded under the selected mobile emulation, blocking cookie dialogs are handled, and a full-page screenshot is available for review.
Background Logging (Console + Errors + Network)
Use background logs to inspect console output, page errors, and network activity. Logging starts automatically with start.js and writes JSONL files to:
~/.cache/agent-web/logs/YYYY-MM-DD/<targetId>.jsonl
Start logging manually when needed:
./scripts/watch.js
Tail the latest log:
./scripts/logs-tail.js
./scripts/logs-tail.js --follow
Summarize network responses:
./scripts/net-summary.js
Success criteria: Console messages, errors, and network responses relevant to the active page are visible through logs or summaries.
Troubleshooting
Use these fallbacks when a browser command fails:
- If Chrome or Chromium is not found, set
BROWSER_BIN=/path/to/chrome before ./scripts/start.js.
- If the debug port is busy, run
./scripts/start.js --stop for the managed instance or set BROWSER_DEBUG_PORT to an unused port.
- If browser state appears stale or corrupted, restart with
./scripts/start.js --reset-profile.
- If navigation appears stuck, capture a screenshot, tail logs, and check network summaries before retrying.
- If JavaScript evaluation fails because of quoting, simplify the snippet or wrap it in single quotes with escaped inner quotes.
- If a visual interaction is ambiguous, use
pick.js to identify the element before evaluating selectors or clicking.
Success criteria: Failures lead to a specific recovery action instead of repeated retries with the same command.
