The Plugins page is a single browsing surface for two related but distinct ecosystems:Documentation Index
Fetch the complete documentation index at: https://docs.mains.dev/llms.txt
Use this file to discover all available pages before exploring further.
- Plugins — official Codex plugins published through the OpenAI marketplace (GitHub, Linear, Jira, Asana, Trello, Sentry, Computer Use, and more)
- Skills — third-party reusable agent skills from skills.sh, installable via
npx skills add <url>
Plugins (Codex Marketplace)
Plugins extend Codex with curated integrations — each one bundles together skills, MCP servers, and apps that target a specific platform or capability. Browsing them inside Mains uses the same marketplace API as the Codex VS Code extension, so the catalog is always in sync.Browsing
| Element | What it shows |
|---|---|
| Plugin card | Logo, brand color, display name, short description, install button |
| Detail page | Long description, screenshots, included items (skills, apps, MCP servers), install policy |
| Connected badge | Green pill on apps that are already authenticated and ready to use |
| Install policy | NOT_AVAILABLE plugins are disabled with a tooltip explaining why |
Installing
Pick a plugin
Click any card to open the detail view. You’ll see screenshots, a long description, and the list of items the plugin includes.
Click Add
Mains forwards the install request to your Codex account. Plugins that need OAuth open the connector flow in a browser window.
What’s Inside a Plugin
Plugins compose three primitives:| Type | Description |
|---|---|
| Skills | Markdown-defined behaviors the agent can invoke (e.g. “address PR comments”) |
| Apps | OAuth-connected services (e.g. GitHub, Linear) that expose actions and data |
| MCP servers | MCP-compatible servers that ship with the plugin |
Connected, Disabled, or a link to install the underlying app if it’s missing.
Skills (skills.sh)
The Skills tab browses third-party skills published on skills.sh. Unlike Codex plugins, skills are not tied to OpenAI’s marketplace — anyone can publish one, and they install via a CLI command.Views
| View | What it shows |
|---|---|
| Curated | Editor-picked groupings (e.g. “Daily standups”, “Release management”) |
| Trending | Skills with the most installs in the last 24 hours |
| Hot | Recent skills with strong engagement |
| All-time | Most-installed skills overall |
Installing a Skill
Skills install through the standaloneskills CLI — Mains shows you the exact command to copy:
~/.claude/skills/ (or .{your_project}/skills/) directory and is picked up on the next agent run.
Skills installed via
npx skills add work with both Claude Code and Cursor runtimes. See Skills for the directory layout and frontmatter format.Plugins vs. Skills — Quick Reference
| Feature | Plugins | Skills |
|---|---|---|
| Catalog | OpenAI Codex marketplace | skills.sh community |
| Runtime | Codex only | Claude Code + Cursor |
| Install flow | One-click from the UI | Copy npx skills add command and run it |
| Includes | Skills + apps + MCP servers (bundled) | Single SKILL.md or skill folder |
| Auth | OAuth handled by the marketplace | None (local files only) |
Related
- Skills — skill file format and how the agents discover them
- MCP Servers — adding MCP servers manually outside the marketplace
- Computer Use — one of the most-used Codex plugins