What problem does it solve? Web pages often fail to be indexed correctly because of duplicate canonical addresses, reused titles and meta descriptions, hardcoded hosts in robots.txt and sitemap.xml, and JSON-LD structured data that contradicts the visible page. This Skill provides a reference of decision rules and verification checklists to catch those defects before shipping. ## Core Features & Use Cases - Canonical and Identity Rules: Enforces one address per resource, redirect discipline for trailing slashes and parameters, and declarations that match the served address. - Metadata and Structured Data Review: Checks per-page title and meta description uniqueness, JSON-LD type selection, absolute addresses, and the mirroring rule that every serialized claim has a visible counterpart. - Crawl Artifact and Semantics Audits: Covers host-derived robots.txt and sitemap.xml, heading structure, image alt text, anchor text, and fragment target resolution. - Use Case: Before deploying a site, run a pre-ship review that fetches each route's canonical declaration, collects titles across all routes to find duplicates, and validates that sitemap entries resolve on the deployed host. ## Quick Start Review this page's canonical tag, title, meta description, and JSON-LD for indexing defects before release.