squirrelscan
The website QA tool for your coding agent
squirrelscan audits your website for SEO, performance, security, accessibility and agent experience issues, and gives your coding agent exact fixes. Run it from the CLI, inside your coding agent, in the cloud, or over MCP. Local audits are always free.
Add to your coding agent
squirrelscan ships as skills (autonomous audit + fix workflows), an MCP server (hosted at mcp.squirrelscan.com), and a plugin for Claude Code and Cursor. Pick your agent:
Cursor
One click: the Add to Cursor badge above, or add the MCP server manually to ~/.cursor/mcp.json:
{
"mcpServers": {
"squirrelscan": { "type": "http", "url": "https://mcp.squirrelscan.com/mcp" }
}
}
Skills install with npx skills add squirrelscan/squirrelscan.
Claude Code
Install the plugin (bundles skills + the MCP server):
/plugin marketplace add squirrelscan/squirrelscan
/plugin install squirrelscan@squirrelscan
Or add just the MCP server:
claude mcp add --transport http squirrelscan https://mcp.squirrelscan.com/mcp
Any MCP client
squirrelscan is in the MCP Registry as com.squirrelscan/squirrelscan. Point any client at the remote server:
https://mcp.squirrelscan.com/mcp
Authentication is per-user OAuth (or pass a squirrelscan API key as a Bearer token).
OpenAI Codex / other agents
Skills follow the Agent Skills standard. Install with npx skills add squirrelscan/squirrelscan (lands in .agents/skills/), or clone this repo and symlink the skills/* directories.
Features
- 260+ Rules, 21 Categories - Comprehensive coverage across SEO, accessibility, performance, and security
- AI-Native Design - LLM-optimised output for Claude Code, Cursor, and any AI assistant
- Smart Incremental Crawling - ETag, Last-Modified, content hashing. Resume from checkpoints.
- Developer-First CLI - Single binary, zero dependencies, shell completions, self-update
- E-E-A-T Auditing - Dedicated rules for Experience, Expertise, Authority, Trust
- Crawl History & Changes - Track site evolution, compare crawls, spot regressions
- Multiple Output Formats - Console, JSON, HTML, Markdown, Text, LLM, XML
CLI
Installation
macOS / Linux:
curl -fsSL https://install.squirrelscan.com | bash
Windows:
iwr -useb https://install.squirrelscan.com/install.ps1 | iex
npm (all platforms):
npm install -g squirrelscan
npx (run without installing):
npx squirrelscan audit example.com
Quick Start
squirrel audit https://example.com
squirrel audit https://example.com -f html -o report.html
squirrel audit https://example.com --format llm | claude
squirrel audit https://example.com -m 10
Skills
Two skills drive agent workflows:
squirrelscan - operating the CLI: install, login, keys, credits, running audits, publishing reports, MCP setup, config, troubleshooting.audit-website - the full fix loop: audit, map issues to source files, fix in batches, re-audit until the site scores well.
npx skills add squirrelscan/squirrelscan
Then, in your agent:
Use the audit-website skill to audit this site and fix all issues but only crawl 10 pages
Rule Categories
| Category | Rules | Focus |
|---|
| Accessibility | 59 | ARIA, button/input names, landmarks, lists, tables, focus |
| Performance | 29 | Core Web Vitals, compression, caching, JS optimization |
| Crawlability | 17 | Robots.txt, sitemaps, indexability |
| Agent Experience | 17 | How ready a site is for AI agents to read, discover, operate |
| Security | 16 | HTTPS, CSP, cookies, leaked secrets |
| Images | 15 | Alt text, formats, lazy loading, optimization |
| E-E-A-T | 15 | Authority, trust, expertise signals |
| Links | 14 | Broken links, redirects, anchor text |
| Core SEO | 13 | Meta tags, canonical, doctype, charset |
| Content | 12 | Readability, freshness, word count |
| Structured Data | 10 | JSON-LD, schema validation |
| Site Integrity | 9 | Injected pages, phishing kits, malware, SEO spam |
| URL Structure | 8 | Length, format, parameters |
| Mobile | 6 | Viewport, tap targets, responsive |
| Social Media | 4 | Open Graph, Twitter Cards |
| Legal Compliance | 4 | Privacy policy, cookie consent |
| Video | 3 | Schema, captions, thumbnails |
| Local SEO | 3 | NAP, geo tags, service areas |
| Blocking | 3 | Content, links, trackers that ad/privacy blockers block |
| Internationalization | 2 | Hreflang, lang attribute |
| Analytics | 2 | GTM, consent mode |
Total: 261 rules across 21 categories
See the rules reference for full details.
| Format | Flag | Use Case |
|---|
| Console | (default) | Human-readable terminal output |
| JSON | -f json | CI/CD, programmatic processing |
| HTML | -f html | Visual reports for sharing |
| Markdown | -f markdown | Documentation, GitHub |
| Text | -f text | Clean output for piping to LLMs |
| LLM | -f llm | LLM optimized output |
Development Status
squirrelscan is in active beta. Expect rapid iteration and breaking changes. Feedback and issue reports welcome!
Links
License
The skills, plugin manifests, MCP configuration, and install scripts in this repository are MIT licensed (see LICENSE). The squirrelscan CLI binary itself is distributed as a standalone executable and is not open source.