Capmonster MCP Patchright Captcha Solver

capmonster-mcp-patchright: Stealth Browser MCP Server for AI Agents

Building an AI agent that has to work on anti-bot protected sites? Pair this stealth browser with the CapMonster Cloud MCP server, a cost-effective capsolver alternative and 2captcha alternative: reCAPTCHA v3 starts at $0.90 per 1,000 solves, which is up to 38% cheaper than 2Captcha and 10% cheaper than Capsolver. See the pairing example and the comparison below.

Stealth browser MCP server for AI agents — 66 tools, Patchright-powered, reduced CDP automation signals.

Built for automation on sites protected by Cloudflare, Akamai, Kasada and DataDome. When the page shows a CAPTCHA, pair it with the CapMonster Cloud MCP server: this server drives the browser, CapMonster Cloud solves the CAPTCHA. Use the 66 browser_* tools for AI-agent web scraping and browser automation with Claude, GPT and other MCP clients, powered by Patchright, a patched Playwright with reduced automation signals. Learn more

[👉 Get your CapMonster Cloud API Key](https://dash.capmonster.cloud/Account/SignUp?utm_source=github&utm_medium=referral&utm_campaign=mcp_patchright_readme&utm_content=header_button)

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Fork of mcp-patchright that adds a per-call world: "main" option to browser_evaluate / browser_run_code_unsafe, so page-defined window globals are visible and callable. Defaults to Patchright's isolated stealth world (matching upstream); opt into main only when a page's own script needs to see or be called by your evaluated code. Everything else matches upstream mcp-patchright.

Why Patchright, not Playwright?

See the full comparison for details.

Quick start

npm i -g capmonster-mcp-patchright

capmonster-mcp-patchright --port 9321 --host 127.0.0.1

With Claude / GPT / agents

{

"mcpServers": { "patchright": { "command": "npx", "args": ["capmonster-mcp-patchright", "--port", "9321", "--host", "127.0.0.1"] } } }

🔗 Pair with CapMonster Cloud MCP for captcha solving

This server drives the browser; the CapMonster Cloud MCP server solves the CAPTCHA and the agent injects the token back into the page. Add both servers to your MCP client config:

{

"mcpServers": { "patchright": { "command": "npx", "args": ["capmonster-mcp-patchright", "--port", "9321", "--host", "127.0.0.1"] }, "capmonster": { "command": "uvx", "args": ["capmonster-mcp"], "env": { "CM_API_KEY": "your_api_key_here" } } } }

Get your key from the CapMonster Cloud Dashboard.

Captcha solving MCP servers compared

*Disclaimer: CapSolver and 2Captcha are trademarks of their respective owners. CapMonster Cloud is not affiliated with these entities. MCP coverage of other services is based on their publicly available documentation and repositories as of 27.10.2026 and may change. Pricing comparisons are based on publicly available data and internal benchmarking conducted on 27.09.2026.*

Features

• 66 MCP tools — full browser automation surface
• `world: "main"` opt-in — browser_evaluate / browser_run_code_unsafe can run in the page's real world to see/call page-defined globals (default stays isolated/stealth)
• `browser_find` — search the current aria snapshot for text/regex, cheaper than a full browser_snapshot
• `browser_save_blob` — save a Blob/data URL produced by page code to disk
• 3 transports — stdio, SSE, Streamable HTTP (/mcp)
• Persistent profiles — real Chrome profile, reuse across sessions
• Multi-page — tab management (new, list, switch, close)
• Owner-scoped HTTP sessions — isolate tabs per caller with owner query/header
• CDP attach — control an already-running Chrome
• Network tracking + interception — request list/detail, offline toggle, block/mock routes
• Session import/export — browser_storage_save / browser_storage_load (cookies + localStorage)
• Granular storage — per-key cookie / localStorage / sessionStorage CRUD (browser_cookie_*, browser_localstorage_*, browser_sessionstorage_*)
• Authenticated API requests — browser_api_request reuses session cookies (hybrid scraping)
• Text/HTML extraction — browser_get_visible_text / _html (token-light)
• Iframe-aware — pass frameSelector to any element tool (click/fill/type/hover/press/wait_for/select/drag) to act inside an iframe
• PDF export — browser_save_pdf via CDP (works in headed/stealth mode)
• Video recording — browser_start with recordVideo, browser_video_save; .webm flushed on browser_close
• Element highlight — browser_highlight / browser_hide_highlight overlays for screenshots & recordings
• Stealth profiles — proxy / geolocation / locale / timezone / colorScheme
• Console capture — real-time console message stream
• Fingerprint check — browser_fingerprint_check diagnostics
• Virtual passkeys — create, import, list, and delete WebAuthn credentials with private keys redacted by default

Tools

Full comparison HTML in /docs/tool-comparison.html.

• browser_start
• browser_status
• browser_navigate
• browser_new_page
• browser_pages
• browser_switch_page
• browser_close_page
• browser_snapshot
• browser_find
• browser_take_screenshot
• browser_click
• browser_fill
• browser_type
• browser_hover
• browser_press_key
• browser_wait_for
• browser_evaluate
• browser_fingerprint_check
• browser_navigate_back
• browser_select_option
• browser_handle_dialog
• browser_file_upload
• browser_network_requests
• browser_network_request
• browser_console_messages
• browser_resize
• browser_drag
• browser_fill_form
• browser_run_code_unsafe
• browser_add_init_script
• browser_network_state_set
• browser_api_request
• browser_get_visible_text
• browser_get_visible_html
• browser_iframe_click
• browser_iframe_fill
• browser_route_block
• browser_route_mock
• browser_route_clear
• browser_storage_save
• browser_storage_load
• browser_cookie_list
• browser_cookie_get
• browser_cookie_set
• browser_cookie_delete
• browser_cookie_clear
• browser_localstorage_list
• browser_localstorage_get
• browser_localstorage_set
• browser_localstorage_delete
• browser_localstorage_clear
• browser_sessionstorage_list
• browser_sessionstorage_get
• browser_sessionstorage_set
• browser_sessionstorage_delete
• browser_sessionstorage_clear
• browser_passkey_install
• browser_passkey_create
• browser_passkey_list
• browser_passkey_delete
• browser_video_save
• browser_highlight
• browser_hide_highlight
• browser_save_blob
• browser_save_pdf
• browser_close

Development

Owner-scoped HTTP sessions

HTTP mode requires a stable owner on the MCP URL (?owner= ) or with the X-Browser-Owner header. Page listing, switching, navigation, and closing are restricted to that owner's tabs. Delete /owners?owner= to close all tabs owned by one caller without stopping the browser or clearing the profile.

npm install

npm run build node dist/index.js

Release

Install the matching Chromium build once, then prepare a release from the exact dependency versions in package-lock.json, run the full verification suite, and inspect the package without publishing it:

npx patchright install chromium

npm run release:check npm publish

By default, browser_start launches Chromium via patchright as headed real Chrome with a persistent profile at:

~/.maestro/stealth-playwright-mcp/profiles/default

You can override it with the userDataDir tool argument or STEALTH_PLAYWRIGHT_USER_DATA_DIR.

To attach to an already-running Chrome instead of launching one, start Chrome with remote debugging and pass cdpEndpoint to browser_start:

google-chrome --remote-debugging-port=9222 --user-data-dir=$HOME/.maestro/stealth-playwright-mcp/profiles/cdp

{ "cdpEndpoint": "http://127.0.0.1:9222" }

browser_snapshot returns Playwright's AI aria snapshot. Use [ref=eN] values from that snapshot with browser_click, browser_fill, browser_type, browser_hover, browser_press, and browser_wait_for by passing { "ref": "eN" }. CSS selectors remain supported via { "selector": "..." }.

MCP config example:

{

"mcpServers": { "patchright": { "command": "node", "args": ["/path/to/capmonster-mcp-patchright/dist/index.js"] } } }

Direction

Shipped:

• ✅ persistent user data dirs
• ✅ CDP attach to real Chrome
• ✅ proxy / timezone / locale / geolocation profiles
• ✅ accessibility snapshots for LLM-friendly page control
• ✅ fingerprint diagnostics
• ✅ network interception (block / mock)
• ✅ session import/export (storageState)
• ✅ PDF export
• ✅ authenticated API requests (reuse browser cookies)
• ✅ lightweight text/HTML extraction
• ✅ iframe actions
• ✅ world: "main" opt-in for browser_evaluate / browser_run_code_unsafe
• ✅ aria-snapshot search (browser_find)
• ✅ save Blob/data URL output to disk (browser_save_blob)

Next:

• rebrowser-playwright backend
• codegen sessions
• coordinate-based (vision) clicks
• tracing / video recording

❓ FAQ

What is capmonster-mcp-patchright? A stealth browser MCP server for AI agents with 66 tools, built on Patchright, a patched Playwright with reduced CDP automation signals.

Does it solve CAPTCHAs? No. This server drives the browser. Pair it with the CapMonster Cloud MCP server to solve reCAPTCHA, Cloudflare Turnstile, DataDome and other captchas.

Is CapMonster Cloud a capsolver alternative or a 2captcha alternative for AI agents? For the captcha solving part, yes. The CapMonster Cloud MCP server covers more captcha types than the CapSolver MCP server (reCAPTCHA v2, v3 and Turnstile) and the 2Captcha mcp-captcha-solver project (reCAPTCHA v2), and reCAPTCHA v3 starts at $0.90 per 1,000 solves. See the comparison above and its disclaimer.

How is it different from Playwright? Patchrigh