Marketing OS is a Markdown-based agent skill that turns Claude, Codex, or Cursor into a structured marketing workspace. Its 14 modules cover website and funnel audits, AI-search citability, copy, hooks, paid ads, email, social posts, launches, positioning, pricing, competitor research, app-store optimization, analytics, and prose-quality checks.
The skill routes each task to the relevant module and can fan out multidimensional work across subagents when the host supports it. It produces scored reports, prioritized fixes, diagnostic briefs, marketing copy and sequences, launch plans, and other finished artifacts rather than advice alone; its reports are designed to identify what could not be determined and label scores as heuristics. It is distributed as pure Markdown under the MIT license and can be installed through Claude Code, uploaded to Claude, or copied into the skills directory of compatible agents.