lumen

Lightweight, pluggable, MCP-first SEO toolkit — free services only, bring your own keys, provenance on every number.

Status: v0.2.x — first public release. The CLI, the five MCP tools, and the docs site are live; see CHANGELOG.md for what shipped and the docs for the full guides.

Why lumen

Most SEO tooling is a black box with a subscription. lumen is the opposite: a local-first, agent-first audit toolkit that runs on free data sources, never ships a number it can't attribute, and speaks MCP so your coding agent can run it for you.

• Local site audits — bounded, robots-respecting crawler with 36 built-in rules, severity scoring, and CI-friendly exit codes (0 pass, 1 findings, 2 usage/abort).
• Free-tier data providers — PageSpeed Insights, CrUX, Google Suggest, Wikipedia demand, OpenPageRank, Tranco, DuckDuckGo SERP. BYOK: keys are read from env vars by name, never stored or logged.
• MCP-first — five tools (lumen_audit_site, lumen_page_report, lumen_keyword_ideas, lumen_rank_check, lumen_authority) over stdio or a thin Cloudflare Worker gateway.
• Provenance on every number — each metric carries its source and fetch timestamp; no free source, no number.

Quickstart

Requires Node >= 22.7.

# One-off audit — no install
npx -y @lumen-seo/cli audit https://example.com

# Install globally
npm install -g @lumen-seo/cli
lumen audit https://example.com --max-pages 50

Wire it into Claude Code (or Cursor / VS Code — MCP onboarding):

claude mcp add --transport stdio lumen -- npx -y @lumen-seo/cli mcp

Then just ask: "audit my site and tell me what to fix first."

Packages

Note on packaging: npm packages ship compiled JavaScript + type declarations (dist/) — plain node import, no flags, no tsx. The TypeScript sources stay the source of truth in the repo; the release pipeline compiles per package at publish time.

Documentation

• Quickstart — first audit, JSON output, CI usage
• CLI reference — all thirteen commands and flags
• Rules reference — the 36 rules, severities, scoring
• Providers & BYOK — data sources, keys, rate-limit etiquette
• MCP onboarding — Claude, Cursor, VS Code, remote gateway

Development

Requires Node >= 22.

npm install
npm run lint
npm run typecheck
npm test

See CONTRIBUTING.md for conventions, SECURITY.md for the security policy, and docs/release.md for the release runbook.

License

Apache-2.0 — Copyright 2026 Nitish Agarwal