URL: /rules --- title: "Rules Reference" description: "All 249 audit rules organized by score group and category" --- squirrelscan includes **249 rules** across **21 categories**, plus opt-in cloud gap analysis. Every category rolls up into one of four score groups: **SEO**, **Performance**, **Security**, and **Agents**. These are the four scores you see on reports and in the dashboard, alongside the overall health score. Most rules run locally for free. A handful of [cloud rules](/cloud/rules) use AI analysis, full filter lists, or live search data - they require login and are skipped when you're not logged in. Cloud rules carry a notice banner on their doc pages. ## SEO Search visibility: crawling, indexing, content, markup, and accessibility. Robots.txt, sitemaps, and crawl directives (17 rules) Essential meta tags and page structure for search engines (13 rules) Internal and external link health and structure (14 rules) Text quality, readability, and content structure (12 rules) Structured data and rich snippet eligibility (10 rules) Image optimization and accessibility (15 rules) Open Graph and social sharing metadata (4 rules) Accessibility for users with disabilities (59 rules) Mobile-friendliness and responsive design (6 rules) URL structure, length, and formatting (8 rules) Language declarations and multi-region support (2 rules) Experience, expertise, authority, trust signals (15 rules) Local business schema and NAP consistency (3 rules) Video content markup and accessibility (3 rules) Tracking and measurement implementation (2 rules) Keyword and content gaps backed by live search data (2 rules, opt-in) ## Performance Page speed and loading behavior. Page speed and loading performance (29 rules) ## Security Transport security, compromise signals, compliance, and blocked content. Signs of compromise: injected pages, phishing kits, malware, SEO spam (9 rules) HTTPS, headers, and safe link practices (14 rules) Privacy policy and legal compliance signals (4 rules) Content, links, and trackers blocked by ad blockers and privacy filters (3 rules) ## Agents The experience a site gives AI agents that read, discover, and operate on it. Agent experience: AI crawler access, LLM parsability, page-type, site profile (7 rules) ## Configuration ### Enable/Disable Rules Use glob patterns in `squirrel.toml`: ```toml squirrel.toml [rules] # Enable specific rules or categories enable = ["*"] # all rules (default) # Disable specific rules disable = [ "ax/*", "ai/*", # disable all Agent Experience rules "content/word-count", # disable specific rule ] ``` ### Rule Options Some rules have configurable options: ```toml squirrel.toml [rules."core/meta-title"] min_length = 30 max_length = 75 [rules."content/word-count"] min_words = 300 ``` See individual rule pages for available options.