tapsite
The MCP server for web intelligence extraction. 55 tools that give AI agents the ability to understand websites — not just drive a browser, but extract structured intelligence about design systems, accessibility, performance, content, and more.
Other MCP browser tools let agents click buttons. tapsite lets agents extract a complete color palette, audit WCAG contrast ratios, diff two sites' design tokens, detect tech stacks, or pull structured data with custom CSS/XPath/regex selectors — all as structured JSON that agents can reason about.
55 Tools · 11 Categories · 4 Workflows · Multi-Format Export
Works with Claude, Cursor, Windsurf, and any MCP-compatible AI agent. LangChain/LangGraph integration coming soon.
Installation
# Quick start (no install required)
npx -y tapsite
# Or install globally
npm install -g tapsite
npx playwright install chromium
npx playwright install-deps chromium
Add to your AI agent's MCP config:
{
"mcpServers": {
"tapsite": {
"command": "npx",
"args": ["-y", "tapsite"]
}
}
}
First run: Playwright will install Chromium automatically if not already present (~150MB one-time download).
Also available on the MCP Registry and Glama.
What makes tapsite different
| Other browser MCPs | tapsite |
|---|---|
| Click buttons | Extract full design systems |
| Fill forms | Audit WCAG accessibility |
| Take screenshots | Diff sites over time |
| Read raw HTML | Detect tech stacks & APIs |
| Custom CSS / XPath / regex extraction | |
| Anti-bot resilience & proxy rotation |
Extract design systems — colors, fonts, spacing scales, breakpoints, components, shadows, icons, CSS variables, and contrast ratios from any website. Output as structured JSON or W3C design tokens.
Audit quality — accessibility scoring with WCAG contrast analysis, performance timing (Core Web Vitals), tech stack detection, dark mode support, and animation inventory.
Compare and track — diff two sites side by side, or track a single site over time with snapshot-based temporal diffs. Regressions and improvements are flagged automatically. Disk caching means crawls resume where they left off, and results are reused across sessions.
Work behind login walls — persistent browser sessions with full MFA support. A 3-tier anti-bot escalation system handles protected sites automatically — from stealth scripts to proxy rotation. Log in once manually, then extract across tool calls without re-authenticating. Credentials never enter the chat.
Tools (55)
Session (8)
| Tool | Description |
|---|---|
tapsite_login_manual | Open headed browser for manual login + MFA |
tapsite_login_check | Verify authenticated session state |
tapsite_inspect | Navigate to URL and inspect the DOM (nav, headings, buttons, forms, tables, links) |
tapsite_screenshot | Take a screenshot of the current page |
tapsite_interact | Click or fill an indexed element from the last inspect |
tapsite_scroll | Scroll the page |
tapsite_run_js | Execute arbitrary JavaScript and return the result |
tapsite_close | Close the browser session |
Content Extraction (6)
| Tool | Description |
|---|---|
tapsite_extract_table | Extract a specific table as structured data |
tapsite_extract_links | Extract all links with text and href |
tapsite_extract_metadata | Extract page metadata (title, description, OG tags, etc.) |
tapsite_extract_content | Extract main readable content (article body, headings, paragraphs) |
tapsite_extract_forms | Extract all forms with fields, labels, and actions |
tapsite_extract_markdown | Extract page content as clean Markdown (raw, fit, or citations mode) with optional chunking |
Custom Extraction (2)
| Tool | Description |
|---|---|
tapsite_extract_custom | Extract structured data using custom schemas (CSS selectors, XPath, or regex) |
tapsite_extract_schema_suggest | Analyze page DOM and auto-suggest extraction schemas |
Design Tokens (5)
| Tool | Description |
|---|---|
tapsite_extract_colors | Extract color palette (hex values + usage counts) |
tapsite_extract_fonts | Extract font families, sizes, weights |
tapsite_extract_css_vars | Extract CSS custom properties |
tapsite_extract_spacing | Extract spacing scale values |
tapsite_extract_shadows | Extract box-shadow and text-shadow patterns |
Visual Assets (4)
| Tool | Description |
|---|---|
tapsite_extract_images | Extract all images with src, alt, dimensions |
tapsite_download_images | Download images to local output directory |
tapsite_extract_svgs | Extract inline SVGs |
tapsite_extract_favicon | Extract favicon URLs and sizes |
Layout Intelligence (3)
| Tool | Description |
|---|---|
tapsite_extract_layout | Extract layout tree (inline text representation) |
tapsite_extract_components | Detect repeated UI components and patterns |
tapsite_extract_breakpoints | Extract responsive breakpoints from CSS media queries |
Quality & Compliance (7)
| Tool | Description |
|---|---|
tapsite_extract_a11y | Accessibility audit (ARIA, roles, contrast issues) |
tapsite_extract_contrast | Audit WCAG contrast ratios between text and background |
tapsite_extract_perf | Extract performance metrics (Core Web Vitals, resource sizes) |
tapsite_extract_security | Audit security headers (CSP, HSTS, SRI, permissions policy) |
tapsite_extract_darkmode | Detect dark mode support and extract dark palette |
tapsite_extract_pwa | Detect PWA support (manifest, service worker, installability) |
tapsite_extract_i18n | Extract internationalization signals (lang, hreflang, translations) |
Technology Detection (10)
| Tool | Description |
|---|---|
tapsite_extract_stack | Detect frontend framework, libraries, and tech stack |
tapsite_extract_animations | Extract CSS animations and transitions |
tapsite_extract_icons | Detect icon libraries and extract icon usage |
tapsite_extract_graphql | Detect GraphQL endpoints and introspect schemas |
tapsite_extract_aiml | Detect AI/ML integrations (models, embeddings, inference endpoints) |
tapsite_extract_canvas | Extract canvas and WebGL usage patterns |
tapsite_extract_wasm | Detect WebAssembly modules and usage |
tapsite_extract_web_components | Detect custom elements and shadow DOM usage |
tapsite_extract_third_party | Inventory third-party scripts, trackers, and services |
tapsite_extract_storage | Audit client-side storage (cookies, localStorage, sessionStorage, IndexedDB) |
Network & API (2)
| Tool | Description |
|---|---|
tapsite_capture_network | Capture network requests during a page load |
tapsite_extract_api_schema | Infer API schema from observed network traffic |
Multi-page (2)
| Tool | Description |
|---|---|
tapsite_crawl | Crawl multiple pages from a start URL |
tapsite_diff_pages | Compare two URLs (cross-site) or track changes over time (temporal) using real extractors |
Export (2)
| Tool | Description |
|---|---|
tapsite_export | Export inspection results as JSON + Markdown + HTML report + CSV tables + screenshots |
tapsite_export_design_report | Full design system report: report.html (visual), design-tokens.json (W3C format), design-tokens.css (copy-pasteable :root vars) |
Engine
Resilient extraction engine. Parallel browser pooling for concurrent page extraction. Persistent disk caching — crawls resume where they left off and results are reused across sessions. 3-tier anti-bot escalation with automatic proxy rotation for protected sites.
Workflows (4)
| Tool | Description |
|---|---|
tapsite_teardown | Comprehensive competitive design teardown (all extractors) |
tapsite_audit | Pre-launch quality audit (a11y, contrast, perf, SEO, darkmode) |
tapsite_harvest | Inventory all site assets (images, SVGs, forms, fonts, links) |
tapsite_designsystem | Extract design tokens as W3C JSON and CSS variables |
LangChain / LangGraph integration (coming soon)
Native LangChain and LangGraph integration is on the roadmap. When released, it will provide a dedicated Python wrapper with tool subsets and managed session lifecycle.
Security
Prompt injection defense (hidden element filtering + output sanitization), HTTPS enforced, private IPs blocked, auth headers redacted. Credentials never enter the chat — log in manually with full MFA support.
Prompt injection defense
Extractors skip hidden elements (display:none, visibility:hidden, opacity:0, zero-size, clip-hidden) to prevent invisible text injection. All output is scanned for prompt injection patterns — instruction overrides, role hijacking, exfiltration attempts, and tool manipulation are flagged inline as [INJECTION_DETECTED].
Credential safety
Never pass credentials through the chat. Use tapsite_login_manual to open a headed browser, log in manually (including MFA), then tapsite_login_check to confirm. Credentials never touch the AI provider's servers or local transcripts.
Docker
tapsite ships a Dockerfile and docker-compose.yml for headless-only use — CI pipelines, server deployments, or anywhere you don't want a local Node.js install.
docker build -t tapsite .
docker compose up
tapsite_login_manual is not available in Docker (it requires a display). To use authenticated sessions in Docker, log in locally first, then mount the profiles/ directory into the container:
volumes:
- ./output:/app/output
- ./profiles:/app/profiles
Security note:
profiles/contains live session cookies. Don't commit it to version control (it's already in.gitignore).
Development setup
git clone https://github.com/mgriffen/tapsite
cd tapsite
npm install
npx playwright install chromium
npx playwright install-deps chromium
MCP config pointing to local source:
{
"mcpServers": {
"tapsite": {
"command": "node",
"args": ["/absolute/path/to/tapsite/src/server.js"]
}
}
}
Project structure
src/
server.js — MCP server entry point
browser.js — shared Chromium context (ensureBrowser, closeBrowser)
helpers.js — shared helpers (safeNavigate, summarizeResult, indexPage)
sanitizer.js — prompt injection detection
diff.js — per-extractor diff logic and extractor name/args mapping
snapshots.js — temporal snapshot I/O (saveSnapshot, loadLatestSnapshot)
browser-pool.js — parallel browser context pooling
cache.js — persistent disk caching with TTL
markdown.js — HTML-to-Markdown converter (raw/fit/citations)
chunker.js — LLM-friendly text chunking (fixed/semantic/sentence)
content-filter.js — BM25 relevance filtering
anti-bot.js — block detection and tier escalation
proxy.js — proxy rotation with failure tracking
stealth-setup.js — Puppeteer-extra stealth plugin registration
extraction-strategies.js — CSS/XPath/regex flexible extractors
extractors.js — browser-context extraction functions (page.evaluate())
exporter.js — file export: JSON, Markdown, HTML, CSV
inspector.js — DOM extraction for inspect tools
cli.js — standalone CLI (login, inspect, session)
config.js — paths and defaults
tools/
session.js — login, inspect, screenshot, interact, scroll, run_js, close
extraction.js — all extract_* tools
network.js — capture_network, extract_api_schema, extract_stack
multipage.js — crawl, diff_pages
export.js — export, export_design_report
workflows.js — teardown, audit, harvest, designsystem
profiles/ — browser state / session cookies (gitignored)
output/ — export results + snapshots (gitignored)
Output formats
output/run-{timestamp}/—tapsite_export: JSON, Markdown, HTML, screenshots, CSV tablesoutput/design-report-{timestamp}/—tapsite_export_design_report:report.html,design-tokens.json,design-tokens.cssoutput/snapshots/{domain}/—tapsite_diff_pagestemporal snapshots
License
MIT