AAJ Marketing Engines MCP server

The math layer for marketing agents

<!-- aaj:n skills -->73<!-- aaj:/n --> marketing skills for AI agents, and <!-- aaj:n engines -->62<!-- aaj:/n --> of them run real engines. Each engine is a dependency-free Node script. It takes your numbers and returns a number and a verdict: LTV:CAC and payback, pipeline coverage, A/B significance, budget splits, price ladders, NRR, market size, inference cost.

Most marketing skills are writing instructions. They help an agent draft a page, an email or a plan, so keep them. These add the arithmetic underneath. The agent that drafts your pricing page can check whether the price still covers inference cost. The agent that writes the board update can compute the forecast instead of estimating it. Same input, same output, and code you can read.

Works with Claude Code, OpenAI Codex, Cursor, Windsurf, Cline and any agent that supports the Agent Skills spec. Free, MIT, no API key, and the engines make no network calls.

Built by Saroj Jha / AAJ. Browsable library at skills.aajconsult.com.

If an engine saves you a spreadsheet, star the repo. Stars are how other founders, and the directories agents search, find it. Questions and engine requests go in Discussions.

Renamed on Oct 11, 2026. copywriting, marketing-psychology, programmatic-seo, marketing-loops and sales-enablement are now aaj-copywriting, aaj-marketing-psychology, aaj-programmatic-seo, aaj-marketing-loops and aaj-sales-enablement. Another popular library publishes skills under the same five names, so with the prefix both install side by side. The hosted MCP server still answers to the old names.

Contents

<!-- aaj:begin catalog-contents -->

• Quick start
• Install as a Claude Code or Codex plugin
• Use it from an MCP client
• Recipes: vendor data in, a verdict out
• What a runnable engine means
• The catalog

<!-- aaj:end catalog-contents -->

• Strategy & Positioning — 12 skills, 9 engines
• Research & Personas — 4 skills, 3 engines
• SEO, GEO & AEO — 9 skills, 8 engines
• Content & Copy — 11 skills, 10 engines
• Conversion & Web — 5 skills, 4 engines
• Paid Media & Budgeting — 4 skills, 4 engines
• Analytics & Experimentation — 4 skills, 4 engines
• Sales & Pipeline — 12 skills, 9 engines
• Retention & Lifecycle — 3 skills, 2 engines
• Growth, Retention & RevOps — 9 skills, 9 engines

• Engines at a glance
• Methodology
• Authoring & contributing
• Credits & license

Quick start

# everything
npx skills add sarojkjha/aaj-marketing-skills

# one skill
npx skills add sarojkjha/aaj-marketing-skills --skill unit-economics

# see what's available
npx skills add sarojkjha/aaj-marketing-skills --list

Installs to .agents/skills/, and symlinks into .claude/skills/ for Claude Code.

Then run any engine with no configuration at all:

node .agents/skills/unit-economics/resources/unit-economics.js --demo

Shortened. The full README is on GitHub.