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 an MCP server (hosted at mcp.squirrelscan.com), skills (autonomous audit + fix workflows), and a plugin for Claude Code and Cursor. Cursor installs in one click from the badge above; the rest are a single copy-paste.

Cursor

Click the Add to Cursor badge above, or add it manually to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "squirrelscan": { "url": "https://mcp.squirrelscan.com/mcp" }
  }
}

Skills: 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

OpenAI Codex

Add the server to ~/.codex/config.toml:

[mcp_servers.squirrelscan]
url = "https://mcp.squirrelscan.com/mcp"

Codex reads Agent Skills from ~/.agents/skills, so skills work too: npx skills add squirrelscan/squirrelscan

opencode

Add the server to opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "squirrelscan": {
      "type": "remote",
      "url": "https://mcp.squirrelscan.com/mcp",
      "enabled": true
    }
  }
}

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). Skills follow the Agent Skills standard: npx skills add squirrelscan/squirrelscan lands them in .agents/skills/.

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

# Audit a website
squirrel audit https://example.com

# Generate HTML r

... [View full README on GitHub](https://github.com/squirrelscan/squirrelscan#readme)