universal-skills-marketplace

ClaudOpenAI — Universal Skills Marketplace

Unofficial. Independent. Community project. Not affiliated with, endorsed by, or sponsored by Anthropic or OpenAI. See NOTICE.

Context7 for skills, not docs. A single MCP server that any Claude Code or OpenAI Codex session can connect to and ask: "find me a skill for X" → get back the best match across both ecosystems → load it on demand.

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Why this exists

Claude Code and OpenAI Codex have converged on the same agentskills.io open standard for skills (SKILL.md with YAML frontmatter + references/ / scripts/ / assets/) but diverge on their plugin manifests (.claude-plugin/plugin.json vs .codex-plugin/plugin.json) and marketplace catalogs.

Today a skill author has to publish twice and a skill consumer can't search one registry across both. ClaudOpenAI is the missing bridge.

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What it does

1. Indexes skills and plugins from public upstream repos in both ecosystems — including anthropics/claude-plugins-official, anthropics/skills, anthropics/knowledge-work-plugins, openai/codex, openai/skills, openai/swarm, openai/openai-agents-python, and openai/codex-plugin-cc.
2. Normalizes both manifest formats into one canonical intermediate representation (zod schema + JSON Schema).
3. Exposes three MCP tools via stdio, streamable-HTTP, and SSE:
   • resolve-skill(query, filters) — BM25 + semantic search
   • get-skill-content(id) — progressive-disclosure fetch (metadata → body → references)
   • install-skill(id, target) — writes to ~/.claude/skills/ or ~/.codex/skills/
4. Serves both ecosystems' marketplace.json formats dynamically from the same backend:
   • GET /.claude-plugin/marketplace.json (Claude format)
   • GET /.agents/plugins/marketplace.json (Codex format)

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Architecture (at a glance)

upstream repos → indexer (cron 6h) → D1 catalog + R2 content cache
                                              ↓
                          ┌───────────────────┴────────────────────┐
                          ↓                                        ↓
             HTTP MCP API Worker                       marketplace.json bridge
             (api.marketplace.blazesportsintel.com)    (registry.marketplace.blazesportsintel.com)
                          ↓                                        ↓
           Claude Code / Codex CLI                     /plugin marketplace add …
           (npx @blazesportsintel/universal-skills-mcp)

See ARCHITECTURE.md for the deep design (D1 ERD, R2 key structure, translator algorithm, indexer state machine).

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Install

Claude Code

/plugin marketplace add ahump20/ClaudOpenAI
/plugin install universal-skills-marketplace@ClaudOpenAI

Or manually add to ~/.claude/mcp.json:

{
  "mcpServers": {
    "universal-skills": {
      "command": "npx",
      "args": ["-y", "@blazesportsintel/universal-skills-mcp"]
    }
  }
}

OpenAI Codex

Add to ~/.codex/config.toml:

[mcp_servers.universal-skills]
command = "npx"
args = ["-y", "@blazesportsintel/universal-skills-mcp"]

Remote (no install)

Point any MCP-compatible client at:

https://api.marketplace.blazesportsintel.com/mcp

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Repository layout

.claude-plugin/plugin.json         # Claude wrapper (trivial, context7-style)
.codex-plugin/plugin.json          # Codex wrapper with full interface{} block
.mcp.json                          # Top-level MCP server declaration
skills/universal-skills-marketplace/   # The guidance skill (router pattern)
packages/mcp-server/               # @blazesportsintel/universal-skills-mcp (npm)
packages/schema/                   # @blazesportsintel/universal-skills-schema (npm)
workers/universal-skills-api/      # HTTP MCP transport (Cloudflare Worker)
workers/universal-skills-indexer/  # Cron-driven upstream indexer
workers/universal-skills-bridge/   # Dynamic marketplace.json emitter
schema/                            # D1 DDL + JSON Schema files
docs/                              # quickstart, authors-guide, spike outputs

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Status

v0.1.0-alpha.0 — all code phases complete, awaiting first deploy.