tapsite

tapsite-mcp

Web intelligence toolkit — an MCP server + CLI built with Node.js and Playwright. Designed for authenticated dashboard inspection, design system extraction, and UI analysis. Reuses browser sessions across tool calls so MFA-protected sites only need one manual login.

Installation

# Quick start (no install required)
npx tapsite-mcp

# Or install globally
npm install -g tapsite-mcp
npx playwright install chromium
npx playwright install-deps chromium

Add to your Claude config (~/.claude/.mcp.json):

{
  "mcpServers": {
    "tapsite": {
      "command": "npx",
      "args": ["tapsite-mcp"]
    }
  }
}

First run: Playwright will install the Chromium browser automatically if not already present. This is a one-time ~150MB download.

Showcase

Click any image to see the full interactive page:

37 MCP tools for authenticated web intelligence extraction — colors, fonts, performance, accessibility, content, forms, assets, and more.

Design System Extraction	Deep Intelligence
Live-extracted colors, fonts, perf, breakpoints, and animations from Stripe, Linear, and Vercel	Accessibility audits, content extraction, form analysis, asset inventory, component detection

Four real-world scenarios — design system reverse-engineering, competitive intelligence, accessibility auditing, and asset migration prep.

Development setup (from source)

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"]
    }
  }
}

Recommended — set transcript cleanup to prevent credentials lingering on disk:

"cleanupPeriodDays": 1

Tools (37)

Session

Tool	Description
tapsite_login	Automated login (username + password, no MFA)
tapsite_login_manual	Open headed browser for manual login + MFA
tapsite_login_check	Verify authenticated session state
tapsite_navigate	Navigate to a URL, returns indexed interactive elements
tapsite_inspect	Full DOM inspection (nav, headings, buttons, forms, tables, links)
tapsite_screenshot	Take a screenshot of the current page
tapsite_act	Click or fill an indexed element from the last inspect/navigate
tapsite_scroll	Scroll the page
tapsite_run_js	Execute arbitrary JavaScript and return the result
tapsite_close	Close the browser session

Content Extraction

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

Design Tokens

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

Visual Assets

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

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

Network Intelligence

Tool	Description
tapsite_capture_network	Capture network requests during a page load
tapsite_extract_api_schema	Infer API schema from observed network traffic
tapsite_detect_stack	Detect frontend framework, libraries, and tech stack

Multi-page

Tool	Description
tapsite_crawl	Crawl multiple pages from a start URL
tapsite_diff_pages	Compare two pages and report differences

Advanced

Tool	Description
tapsite_extract_animations	Extract CSS animations and transitions
tapsite_extract_a11y	Accessibility audit (ARIA, roles, contrast issues)
tapsite_detect_darkmode	Detect dark mode support and extract dark palette
tapsite_extract_perf	Extract performance metrics (Core Web Vitals, resource sizes)

Export

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)

Security

Prompt injection defense

When extracting content from untrusted web pages, tapsite applies two layers of protection:

• Hidden element filtering — Extractors skip elements with display:none, visibility:hidden, opacity:0, zero-size, and clip-hidden styling. This prevents invisible text (a common prompt injection vector) from entering extraction results. Applied to content, links, forms, and accessibility extractors.

• Output sanitization — All text returned to the LLM is scanned for prompt injection patterns: instruction overrides, role hijacking, exfiltration attempts, and tool manipulation. Matches are flagged inline as [INJECTION_DETECTED] rather than silently dropped, so both the LLM and user can see what was caught.

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 Anthropic's servers or local transcripts.

License

MIT

Project structure

src/
  server.js        — MCP server entry point
  browser.js       — shared Chromium context (ensureBrowser, closeBrowser)
  helpers.js       — shared helpers (navigateIfNeeded, summarizeResult, indexPage)
  sanitizer.js     — prompt injection detection
  extractors.js    — browser-context extraction functions (page.evaluate())
  exporter.js      — file export: JSON, Markdown, HTML, CSV
  inspector.js     — DOM extraction for inspect/navigate tools
  cli.js           — standalone CLI (login, inspect, session)
  config.js        — paths and defaults
  tools/
    session.js     — login, navigate, inspect, screenshot, act, scroll, run_js, close
    extraction.js  — all extract_* and detect_* tools
    network.js     — capture_network, extract_api_schema, detect_stack
    multipage.js   — crawl, diff_pages
    export.js      — export, export_design_report
profiles/          — browser state / session cookies (gitignored)
output/            — export results (gitignored)

Output formats

• output/run-{timestamp}/ — tapsite_export runs: JSON, Markdown, HTML, screenshots, CSV tables
• output/design-report-{timestamp}/ — tapsite_export_design_report runs: report.html, design-tokens.json, design-tokens.css