Vibe Doc is an AI-powered documentation gap analyzer for any codebase. It scans your project's artifacts, classifies the project type (web app, API, data pipeline, Claude Code plugin, etc.), measures coverage against a tier-appropriate documentation matrix, and either generates the missing docs from your existing artifacts or hands you a ranked list of gaps to close. Five slash commands cover the loop: /vibe-doc:scan (analyze), /vibe-doc:generate (write missing docs), /vibe-doc:check (CI deployment-readiness gate), /vibe-doc:status (snapshot), and /vibe-doc:evolve (Level-3 self-improvement — the plugin reads its own session logs and proposes SKILL improvements). Honest about coverage: no cherry-picked denominators, no false negatives the matcher has learned to flag.