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squirrelscan

by squirrelscanversion 1.0.2i★ –iRuns in the cloud
Registry namecom.squirrelscan/squirrelscan

Install

Overview

Description from the maker (original English)

Website QA for your coding agent: audit SEO, performance, security, accessibility over MCP.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

  • Connection: Runs in the cloud
  • Transport: Streamable HTTP
  • Category: Marketing & social media

Install

Pick the AI app you use, then copy the settings.

Before you install

  • Basic checks: 1 of 1 passed
  • Runs on the maker’s server: what you ask it goes through their server.
  • The registry lists no key to fill in.

You need

Which app do you use?

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

  1. Open Settings → Connectors
  2. Press Add custom connector
  3. Paste the address below and press Add
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Add2https://…3
https://mcp.squirrelscan.com/mcp

Run this in your terminal

claude mcp add --transport http squirrelscan https://mcp.squirrelscan.com/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

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

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "squirrelscan": {
      "type": "http",
      "url": "https://mcp.squirrelscan.com/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

  1. Open ChatGPT on the web → Settings → Connectors (Apps)
  2. Press Create or Add (some plans need Developer mode under Advanced first)
  3. Paste the address below, give it a name and save
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Create2https://…3
https://mcp.squirrelscan.com/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

  • ✓ Pass

    Maker matches the repo

    The registry name was verified against the domain squirrelscan.com (the registry checks domain ownership)

  • … Not checked yet

    Still maintained

    We have not read this repo from GitHub yet

  • … Not checked yet

    Has a licence

    We have not read this repo from GitHub yet

  • … Not checked yet

    Endpoint responds

    Not checked yet; we check endpoints in rotation

  • … Not checked yet

    Sign-in with OAuth

    Not checked yet; we check endpoints in rotation

  • … Not checked yet

    No hidden instructions in tool descriptions

    Not checked yet; we read the tool list when we check the endpoint

Compared with others in Marketing & social mediai

  • More stars than 0% of the other 2953 servers in this category
  • Published to the registry more recently than 19% of the other 2953 servers in this category
  • Basic checks equal to or better than 100% of the other 2953 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is squirrelscan safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.2) reached the registry 4 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: MCP YouTube Transcript, Google Analytics MCP, BibiGPT YouTube Video Summarizer

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

An MCP server retrieving transcripts of YouTube videos

Runs on your computer★ 495MITUpdated 9 days ago
Install

GA4 MCP server for AI agents: schema discovery, server-side aggregation, analysis-ready defaults.

Runs on your computer★ 244MITUpdated 9 days ago
Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

squirrelscan

The website QA tool for your coding agent

squirrelscan is an Open Source cli tool that audits websites for SEO, performance, security, accessibility, agent experience and other issues, and gives your coding agent exact fixes. Run it from the CLI, inside your coding agent, in the cloud, or over MCP.

Combine your coding agent with a deterministic and extensible audit tool.

A real run on a tiny test site, with the released CLI (signed out, so free) and Claude Code. We cut the two minutes the agent spent working, because nobody wants to watch an agent think.

Features

  • [Built for coding agents](https://docs.squirrelscan.com/developers/agents) - Skills for Claude Code, Cursor, Codex and any coding agent run the audit, fix and re-audit loop. Connect over the CLI, the hosted or local MCP server, or the API.
  • [Enriched fixes for you and your coding agent](https://docs.squirrelscan.com/guides/fix-your-site-with-an-ai-agent) - Every finding says how to fix it, in LLM-optimized output your agent can apply, and every rule has its own docs page. Signed in, the report adds an editor's summary of what to fix first and the technology stack the site runs on.
  • [300+ rules, 22 categories](https://docs.squirrelscan.com/rules) - Audit coverage across SEO, accessibility, performance, security, content and more.
  • [Agent experience](https://docs.squirrelscan.com/rules/ax) - Audit how well AI agents can read, discover and act on your site: llms.txt, AGENTS.md, Markdown responses, and what AI crawlers are served.
  • [Link checking and monitoring](https://docs.squirrelscan.com/guides/link-checking) - Perch, the cloud link checker, tells a broken link from a blocked one and confirms a failure before reporting it. On Pro and Team, scheduled audits email you when a link breaks.
  • [Security and site integrity](https://docs.squirrelscan.com/rules/integrity) - Detect phishing kits, injected pages, leaked credentials and missing security headers.
  • [Entity map](https://docs.squirrelscan.com/guides/entity-map) - Your site's JSON-LD collapsed into one graph: one identity, or a new one on every page.
  • [Browser rendering in the cloud](https://docs.squirrelscan.com/guides/browser-rendering) - Signed in, pages are rendered in a real browser in the cloud, so single-page apps and JavaScript-heavy sites are audited as visitors see them, at no extra cost per page.
  • [Cloud audits](https://docs.squirrelscan.com/guides/cloud-audits) - AI page analysis, scheduled audits, a per-website issue tracker and shareable reports.
  • [Smart crawling](https://docs.squirrelscan.com/crawl) - Fast and memory efficient, incremental with ETag, Last-Modified and content hashing, and resumable from checkpoints.
  • [Crawl history and changes](https://docs.squirrelscan.com/cli/report) - Track site evolution, compare crawls, spot regressions.
  • [Developer-first CLI](https://docs.squirrelscan.com/cli) - Single binary, zero dependencies, shell completions, self-update.
  • [Multiple output formats](https://docs.squirrelscan.com/cli/report#output-formats) - Console, JSON, HTML, Markdown, Text, LLM, XML.

Rule categories

Ordered by how much a failure usually costs you, not by how many rules each one has.

CategoryRulesWhat it covers
Crawlability21Whether search engines and agents can reach and index you at all: robots.txt, sitemap validity and coverage, indexability conflicts, redirect and canonical chains, soft 404s
Core SEO14The per-page fundamentals: title, meta description, H1, canonical, charset, doctype, robots meta, Open Graph and Twitter cards, plus canonical form drift across the site
Agent Experience17How ready you are for AI agents to read, discover and act on the site: whether GPTBot and Claude-User get the same content a browser does, AGENTS.md, llms.txt, Markdown responses, API and MCP discovery, licensing and noai signals, pay-per-crawl, response token weight
Site Integrity9Signs the site has been compromised: injected doorway pages, phishing kit signatures, obfuscated scripts, brand impersonation, cloaking, known-malicious URLs
Security23Transport and header hygiene: HTTPS and HSTS, CSP, cookie flags, mixed content, subresource integrity, leaked secrets, tokens in web storage, unprotected and downgraded forms, open GraphQL introspection and mutations over GET
Links14Internal and external link health: broken and dead links, in-page anchors whose target is gone, redirect chains, anchor-text quality, orphan and dead-end pages, pages linked only from sitewide chrome, HTTPS downgrades
Content25Text quality and honesty: common misspellings, duplicate titles and descriptions, title-template consistency, readability, word count, freshness, heading hierarchy, keyword stuffing, hidden text, placeholder media and contact details, encoding damage
Performance32Core Web Vitals and delivery: LCP, CLS and INP hints, TTFB, compression, caching, render-blocking resources, DOM size, font delivery, legacy and unminified JS/CSS
Reliability5Scripts, stylesheets and fonts that fail to load (a first-party bundle that answers 404 or 500 after a deploy, third-party and font failures), and forms that lose submissions
Images16Alt text, modern formats, responsive srcset, intrinsic dimensions and aspect-ratio mismatches, lazy loading above versus below the fold, file weight
Structured Data26JSON-LD validity and rich-result eligibility for Article, Product, FAQ, Review, Breadcrumb, Organization, LocalBusiness, Video and site search, the markup a page's classified type should carry, plus thirteen site-wide checks on the entity map: whether the site declares one identity for itself or a new one on every page, and rating markup that is not about the page it sits on
Accessibility61WCAG coverage: ARIA roles and names, form labels and autocomplete tokens, colour contrast, heading order, landmarks, tables and lists, focus visibility, touch targets, captions
Mobile8Viewport configuration, tap-target size, legible font sizes, horizontal scroll, blocked zoom, form fields small enough to zoom the page on focus, intrusive interstitials, the web app manifest and its icons
Social Media5Open Graph and Twitter Card completeness, image dimensions, canonical URL match, social profile links, site-chrome assets that disagree across pages
URL Structure9Length, casing, hyphenation, stop words, query parameters, special characters, trailing-slash consistency, site-wide convention consistency
E-E-A-T15Experience, expertise, authority and trust signals: author bylines and credentials, about and contact pages, citations, editorial policy, disclaimers, YMYL detection
Legal Compliance4Privacy policy, terms of service, real cookie-consent machinery, subprocessor disclosure
Internationalization2hreflang correctness and the document language declaration
Local SEO3NAP (name, address, phone) consistency across every crawled page, geo metadata, service-area businesses
Video3VideoObject markup, captions and accessibility, thumbnails
Analytics2Google Tag Manager presence and consent-mode wiring
Blocking3Content, links and trackers that ad blockers and privacy filters strip for a large share of your visitors

Total: 300+ rules across 22 categories

See the rules reference for full details.

CLI

Installation

Paste into your coding agent (Claude Code, Codex, Cursor, opencode and friends):

Fetch and follow the setup instructions for squirrelscan at https://docs.squirrelscan.com/agent-setup/prompt.md

Your agent installs the CLI, connects MCP and runs a first audit. You can read exactly what it will follow first.

macOS / Linux:

curl -fsSL https://install.squirrelscan.com | bash

Windows:

iwr -useb https://install.squirrelscan.com/install.ps1 | iex

Homebrew (macOS):

brew install --cask squirrelscan/tap/squirrel

The cask installs a launcher that runs the regular installer on first use. The CLI then updates itself with squirrel self update; brew upgrade leaves it alone.

npm (all platforms):

npm install -g squirrelscan

npx (run without installing):

npx squirrelscan audit example.com
Quick start
# Audit a website

squirrel audit example.com

Generate HTML report

squirrel audit example.com -f html -o report.html

Pipe to Claude for AI analysis

squirrel audit example.com --format llm | claude

Quick audit for a fast first look (other levels: surface, full)

squirrel audit example.com --level quick

run only agent experience and performance rules

squirrel audit example.com --rule-include ax,performance

login for cloud audits and cloud rendering

squirrel auth login

Reports

A health score and grade, group scores for SEO, performance, security and Agent Experience (AX) colored by score, a ranked list of issues, and a copy fix prompt for each one that you can paste into your coding agent. Publish reports to the web to share with team members or coding agents (fix instructions are embedded).

See an example report, or read how to read your report.

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

Cl

Only the beginning is shown; read the rest in the repo

Ask PopNx