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fortress-stealth-browser

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Use when a web fetch is blocked — Cloudflare, DataDome, PerimeterX, Akamai, a 403/429, a CAPTCHA/"Press & Hold", "Access denied", an empty JavaScript shell, or a page whose data only appears after client-side rendering. Drives a real recompiled-Chromium stealth engine (Fortress) via the Fortress MCP to fetch, extract, crawl, recon, search, and automate. Also use to get clean markdown/tables/JSON from any page, or a CDP endpoint to run existing Playwright/Puppeteer/browser-use code through the stealth browser.

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How to use this skill

Bring this guide into your coding agent with a prompt tailored to the tool you use.

  1. Open your project in Codex.
  2. Copy the prompt below and paste it into your agent.
  3. Review the proposed files and risks before you approve installation.
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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/tiliondev/fortress/blob/HEAD/mcp/skill/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/fortress-stealth-browser/. Do not write files or run scripts until I approve.

After I approve, install the complete skill folder, including required referenced files, into that project location. Verify it is discoverable, then tell me its actual invocation name and how to use it. Do not claim it is installed until you have verified it.

Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

Fortress stealth-browser skill

When to use this

Reach for the fortress MCP tools the moment a normal fetch fails or returns junk:

  • HTTP 403 / 429 / 503, a Cloudflare "Just a moment", DataDome/PerimeterX walls, "Access to this page has been denied", "Press & Hold to confirm you are human".
  • The page is a JavaScript SPA and the plain HTML is an empty shell.
  • You need structured data (markdown, tables, or a schema-shaped record), a whole-site crawl, or the site's private JSON API.
  • You have Playwright/Puppeteer/browser-use code that keeps getting detected — get a stealth CDP endpoint and point your code at it.

Setup

pip install "tilion[mcp]"

Add to the client MCP config: { "mcpServers": { "fortress": { "command": "tilion-mcp" } } }

Tool cheat-sheet (pick by intent)

  • Blocked / need the page → fetch_protected_page(url) → {status, http_status, blocked, waf, title, text}.
  • Clean content → read_page(url) (markdown) or extract_page(url, schema?) (record).
  • A file (PDF/DOCX/XLSX/CSV) → extract_document(source).
  • Whole site → crawl_site(url, depth, max_pages).
  • Find the data source → recon_site_apis(url) → discovered XHR/JSON endpoints.
  • Search the web → search_web(query, count) (real browser, no SERP key).
  • Interact → page_elements → click_button / fill_field / press_key / wait_for / evaluate_js; check with current_page.
  • Multi-step flow (login, paginate, infinite-scroll, checkout) → list_browser_tasks() then run_browser_task(task, url, params?).
  • Identify the anti-bot → detect_waf(url) → {vendor, challenged, strategy}.
  • Solve a captcha → solve_captcha(url) (needs CAPTCHA_API_KEY).
  • Check egress → get_egress_info() → the real public IP the target sees.
  • Auth reuse → save_profile(name) / load_profile(name).
  • Capture → screenshot_page / save_page(format=pdf|html|text|png) / download_file.
  • Bring your own automation → get_stealth_cdp_endpoint() → a CDP url for Playwright / Puppeteer / browser-use / Crawl4AI.

Handling a block (the golden path)

fetch_protected_page returns a waf field — read it, don't guess:

  • status:"ok" → you have the page; extract/read/act.
  • status:"empty" → JS withheld content; retry or use run_browser_task to interact.
  • status:"blocked" → check waf.vendor: cloudflare/incapsula usually auto-clears (retry once); datadome/perimeterx are behavioral (fetch already nudged — if still blocked you need residential egress); akamai/kasada are IP-gated → set TILION_PROXY and retry; a captcha present → solve_captcha (or fetch auto-solves with CAPTCHA_API_KEY).

Configure the hard-target levers (env)

  • TILION_PROXY=http://user:pass@host:port — residential/mobile egress (the #1 unblock lever; verify with get_egress_info). TILION_REGION=us aligns timezone/locale to the IP.
  • CAPTCHA_API_KEY=... (+ CAPTCHA_PROVIDER=2captcha|anticaptcha|capsolver) — auto-solve.

Good habits

  • Prefer extract_page/read_page over dumping raw HTML — outputs are capped and clean.
  • For an authenticated site, load_profile before fetching so cookies + solved challenges are reused.
  • Reads are safe/auto-approved; run_browser_task, save_page, download_file write or act — confirm intent first.
  • A great fingerprint on a datacenter IP can still be blocked by the hardest sites; on a residential IP the local engine clears most walls. Hosted residential egress is coming soon.

Reference

  • mcp/USAGE.md — the full 29-tool guide: per-tool detail, workflow recipes, result-reading, and config.
  • mcp/README.md — install, tool table, benchmarks.