One catalog to rule every AI assistant's plugin zoo

What it does

It’s a curated, cross-platform catalog of AI assistant extensions — plugins, skills, MCP servers, apps, and agent tools — covering Claude Code, Codex/ChatGPT, Gemini CLI, Grok, Kimi, DeepSeek Harness, Cursor, OpenCode, and more. Each entry links out to the project itself; this repo is explicitly a discovery catalog, not an installer. There’s also a searchable registry at hol.org and machine-readable exports (plugins.json, .agents/plugins/marketplace.json) for automation consumers.

The interesting bit

The trust-score mechanic: HOL scans every listed project independently, and projects that run the recommended scanner GitHub Action in CI get the full trust score — those that don’t take a 10% reduction. It’s a soft nudge toward continuous security checking in an ecosystem where “install this MCP server” is increasingly a leap of faith.

Key highlights

• Covers both single-client plugins and open standards like Agent Skills and MCP
• Includes an official-plugins section (OpenAI’s Codex directory picks: GitHub, Figma, Slack, Sentry, etc.)
• Machine-readable exports for registry and automation use
• Community-driven via PRs, with a validation tool (plugin-scanner) for submitters

Caveats

• It’s a list, not a product — the value is entirely in curation and links, and quality of individual entries will vary
• The trust-score system is HOL’s own scheme; how rigorous the independent scanning is isn’t detailed in the README

Verdict

Worth a bookmark if you juggle multiple AI coding assistants and want one place to discover extensions. If you’re loyal to a single client, its native directory probably serves you fine.