Skip to main content
The Plugins page is a single browsing surface for two related but distinct ecosystems:
  • Plugins — official Codex plugins published through the OpenAI marketplace (GitHub, Linear, Jira, Asana, Trello, Sentry, Computer Use, Image Generation, and more)
  • Skills — third-party reusable agent skills from skills.sh, installable via npx skills add <url>
Both are managed from the same page using a tab switcher. Open it from the sidebar at any time — it’s a top-level destination, not a settings panel.

​
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

​
Installing

1

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.
2

Click Add

Mains forwards the install request to your Codex account. Plugins that need OAuth open the connector flow in a browser window.
3

Use it in a Codex run

The plugin’s tools become available to the Codex agent on the next run. You can also see it listed under Installed plugins in Settings.
To remove a plugin, click Uninstall on its detail page. Mains revokes the install and refreshes the catalog automatically.

​
What’s Inside a Plugin

Plugins compose three primitives: The detail page shows every included item with a status pill — 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

A search bar at the top filters across all views.

​
Installing a Skill

Skills install through the standalone skills CLI — Mains shows you the exact command to copy:
Open the skill detail page to see its description, owner, install URL, and a one-click copy button for the install command. Run it in your terminal — the skill appears in your ~/.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

  • 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
  • Image generation — create and edit images via the Image Generation marketplace plugin