browser

Browser Tool Guide

The browser tool controls the default browser inside the instance via CDP. All calls use action as the top-level discriminator; interaction goes through action: "act" with a request object.

Profile: Use "chromebrowser" unless the user specifies otherwise.

⚠️ CRITICAL: Human-in-the-loop & <browser-handoff />

STOP AND HAND OFF when any step requires human judgment: login, CAPTCHA, QR code, payment, SMS/email verification, cookie consent, confirmation prompts, or when the user explicitly asks to take over.

You MUST include <browser-handoff /> at the very end of your reply. The system uses this tag to unlock browser control for the user — without it, the browser remains locked to the agent. Then take a screenshot (it will render automatically), explain what the user needs to do, and WAIT for confirmation.

The page requires login. Please complete it and let me know when done.

<browser-handoff />

Never automate credentials or bypass verification. If in doubt, emit the tag — a false positive is harmless; a missing tag blocks the user.

Core Loop

⚠️ Serial calls only. NEVER call browser tools in parallel. Each call depends on the previous result.

Basic sequence: open → snapshot → act → (snapshot if needed) → act → …

• After open → snapshot immediately.
• After snapshot → act on the refs you got. Don't re-snapshot unless the result was empty.
• After act → snapshot only if the page may have changed (navigation, submit, dynamic load).
• Snapshot mode: default returns full page. Use interactive: true for targeted operations once layout is clear, or compact: true on large pages. Never use interactive: true on first load.
• Screenshot only on task completion or user request. Use screenshot for visual interpretation when DOM alone is ambiguous.

Discipline Rules

• <browser-handoff /> is mandatory on any handoff. Login, CAPTCHA, payment, verification → emit the tag at the end of your reply. No tag = user is blocked.
• Tab cleanup on task completion. See section below.
• One call at a time. Read each response before the next.
• Snapshot → Act. Get refs from snapshot before acting. Re-snapshot only after navigation, submit, or dynamic DOM change — not between consecutive actions on a stable page.
• Screenshot only on task completion or user request. DOM parsing covers page state during the task.
• 2-error abort. Two consecutive failures → stop and report.
• No repeats. Don't re-open an already-open URL. Don't retry without reading the error.
• Manual login only. Never automate credential entry.
• Type appends. To replace: Control+a first, then type. Use fill for batch fields.
• Required fields first. * means required — fill before optional fields.
• SSO redirects. Don't loop on logout/refresh. Hand off.
• No fabricated queries. Always trigger searches through page interactions.

⚠️ Tab Cleanup on Task Completion

When to check: call { "action": "tabs" } when the task finishes (best-effort — if it fails, skip and finish normally). Especially important after long-running tasks (5+ browser actions) where tabs are likely to have accumulated.

| Tabs open | Action | |-----------|--------| | ≤ 5 | Silent. No mention needed. | | 6 – 10 | Brief note: _"Opened N tabs — want me to close them?"_ | | 11 – 19 | Recommend: _"N tabs open, suggest closing task tabs to free resources."_ | | ≥ 20 | ⚠️ Warn: _"N tabs open — will cause slowdown/crashes. Close task tabs?"_ |

Rules:

• Only close tabs opened during the current task. If unsure which are yours, list candidates and ask.
• If user has set auto-cleanup preference ("以后直接关" / "always close when done"), close without asking and confirm: _"Closed N tabs."_

Last-resort actions

Only when the core loop has failed.

• wait — use only if snapshot comes back empty.
• evaluate — only for viewport scrolling or custom JS with no alternative.
• status / start — only on explicit browser error.

Cookbook

Open & inspect

{ "action": "open", "url": "https://example.com" }
{ "action": "snapshot" }

Login-gated sites (大众点评, 知乎, etc.)

1. Prompt login first — hand off with <browser-handoff />.
2. If user declines, attempt as unauthenticated.
3. If blocked, prompt login again.

Click / type / fill

{ "action": "snapshot", "interactive": true }
// button "Submit" [ref=e5]
{ "action": "act", "request": { "kind": "click", "ref": "e5" }}

// textbox "Search" [ref=e3] — type appends; Control+a to clear first
{ "action": "act", "request": { "kind": "type", "ref": "e3", "text": "OpenClaw", "submit": true }}

// batch fill
{ "action": "act", "request": { "kind": "fill", "fields": [
  { "ref": "e1", "value": "Ada Lovelace" },
  { "ref": "e2", "value": "[email protected]" }
]}}

Other interactions

{ "action": "act", "request": { "kind": "click", "ref": "e1", "doubleClick": true }}
{ "action": "act", "request": { "kind": "click", "ref": "e1", "button": "right" }}
{ "action": "act", "request": { "kind": "select", "ref": "e9", "values": ["OptionA"] }}
{ "action": "act", "request": { "kind": "press", "key": "Control+a" }}
{ "action": "act", "request": { "kind": "hover", "ref": "e4" }}
{ "action": "act", "request": { "kind": "drag", "startRef": "e10", "endRef": "e11" }}
{ "action": "act", "request": { "kind": "resize", "width": 375, "height": 812 }}

Screenshot

{ "action": "screenshot" }                              // viewport
{ "action": "screenshot", "fullPage": true }             // full page
{ "action": "screenshot", "ref": "12" }                  // element by ref
{ "action": "screenshot", "element": ".hero" }           // element by CSS

⚠️ Always use MEDIA:<path> to show screenshots to the user — don't just describe them.

MEDIA:/tmp/openclaw/screenshots/page_17100.png

Dialog / Upload / PDF

// Confirm dialog — arm first, then trigger
{ "action": "dialog", "accept": true }
{ "action": "act", "request": { "kind": "click", "ref": "e8" }}

// Upload — files must be in /tmp/openclaw/uploads/
{ "action": "upload", "paths": ["/tmp/openclaw/uploads/report.pdf"], "inputRef": "e5" }

// Export page as PDF
{ "action": "pdf" }

Advanced: Tab Management

For multi-tab workflows only.

{ "action": "tabs" }                                    // list tabs
{ "action": "open", "url": "https://other.com" }        // new tab
{ "action": "focus", "targetId": "ABCD1234" }           // switch tab
{ "action": "close", "targetId": "ABCD1234" }           // close tab

Troubleshooting

// Snapshot empty → wait then retry
{ "action": "act", "request": { "kind": "wait", "loadState": "networkidle" }}
{ "action": "snapshot", "interactive": true }

// Browser not responding
{ "action": "status" }
{ "action": "start" }

// Check JS errors
{ "action": "console", "level": "error" }