About OpenSkillIndex
Skills for agentic AI systems are scattered across GitHub repos, marketplaces, blog posts, and Twitter threads. OpenSkillIndex is a neutral registry that indexes them all — harness-agnostic, free to use, open to contributors.
What we index
- Skills — Claude Code
SKILL.mdformat, OpenClaw manifests, and similar - Plugins — adjacent agentic artifacts with manifest-declared behavior
- GPTs / Assistants / Agents — tagged as artifact subtypes so you can filter them in or out
What makes this neutral
OpenSkillIndex is not affiliated with Anthropic, OpenAI, OpenClaw, or any single harness vendor. Every skill page shows its source, its ecosystem tag with our confidence level, and the authoritative install link that sends you back to the original repo or marketplace. We don't re-host code. We don't sell placement.
How ecosystem detection works
Each skill is matched against a rule matrix with explicit confidence levels (heuristic / strong / verified). When the signal is ambiguous, the ecosystem is marked unknown rather than forced into a bucket. Authors can claim their skills (via GitHub OAuth, coming soon) and override.
Ranking
Search uses Postgres full-text rank plus trigram name similarity, with an exact-match short-circuit for slug and canonical name, log-scaled popularity, and a freshness penalty for skills that haven't been confirmed working recently. The full formula is versioned in the open-source ranking module.
Open source
Frontend + API + schema + migrations + ranking formula + ecosystem detection rules + reference GitHub crawler are open source under the MIT license. Production crawler schedules, anti-abuse heuristics, secrets, and exact enrichment prompts are kept private for operational-security and abuse-prevention reasons — not as a moat.
GitHub org: openskillindex (public repositories launching with the v1.0 release).
Takedowns & contact
If your skill should not be indexed, email support@openskillindex.com and we'll hide it within 24 hours. See /bot for crawler policy.
Credits
Data sourced from public GitHub repositories, surfaced with attribution. Design built with Next.js 15, Tailwind, Postgres+pgvector. Typography: Fraunces (serif), Inter (sans), JetBrains Mono.