Verified
Which plugins can you use in Codex?
Codex can install plugins from configured marketplaces, but not every one of the 2,765 portable Agent Plugins in this directory is necessarily published in a Codex marketplace. This page uses the verified census to surface compatibility candidates, then separates manifest conformance from actual Codex availability. Check the Plugins screen in your Codex client for the final installable set.
Which Codex plugin candidates are worth checking first?
These are ten highly starred repositories that publish a current Agent Plugins 1.0.0 package. They are useful discovery candidates, not a claim that every row is present in OpenAI's marketplace. Open a listing to inspect its skills, MCP servers, source, and manifest before looking for it in Codex.
| Plugin | Publisher | Skills | MCP | Stars |
|---|---|---|---|---|
| worldmonitor | koala73 |
25 | 2 | 87,129 |
| context7 | upstash |
1 | 1 | 62,267 |
| chrome-devtools | ChromeDevTools |
7 | 1 | 52,414 |
| agentic-bundle-aas-accessibility-inclusive-ux (+36) | sickn33 |
308 | 0 | 46,689 |
| scientific-agent-skills | K-Dense-AI |
166 | 0 | 45,870 |
| daisyui | saadeghi |
1 | 0 | 42,441 |
| openviking | volcengine |
3 | 1 | 38,289 |
| diffusers | huggingface |
4 | 0 | 34,555 |
| aihawk | feder-cr |
1 | 1 | 31,614 |
| pascal-agent-skills | pascalorg |
2 | 1 | 24,180 |
Browse the complete verified directory, the general Agent Plugin Marketplace, or search every listing.
How do you install plugins in Codex?
OpenAI's current Plugins in Codex help article is the authority for the interface available in your account. Open the Plugins area in Codex, choose a configured marketplace, select a published plugin, and install or enable it. Start a new session when the client instructs you to do so, because bundled skills and tools are loaded into session context.
Marketplace membership is decisive. A valid package in a public GitHub repository does not automatically appear in Codex, and this independent directory cannot publish it into OpenAI's marketplace.
What format does OpenAI's Codex marketplace use?
OpenAI's public plugins repository documents its own distribution layout. A Codex package uses .codex-plugin/plugin.json, while a repository marketplace is described by .agents/plugins/marketplace.json. These are OpenAI marketplace conventions.
The open Agent Plugins 1.0.0 specification checked by this site uses a root plugin.json and optional root mcp.json. The formats are related but not identical. Therefore:
| Evidence | What it proves |
|---|---|
Valid root Agent Plugins plugin.json |
The portable manifest conforms to Agent Plugins 1.0.0 |
| Entry in a configured Codex marketplace | Codex can discover that marketplace package |
| Successful installation in your Codex client | That package is currently available to your account and client version |
No one of those facts should be substituted for another.
Can Codex install an arbitrary Agent Plugin Git URL?
Do not assume so. OpenAI's current public model centers on configured marketplaces. If a repository is not represented by a marketplace you trust and configure, a portable root manifest alone is not evidence that Codex will accept the repository as an install URL.
For teams, review the marketplace file and package source before configuration. For publishers, follow OpenAI's current repository guidance rather than renaming or relocating a portable manifest based on an unofficial example.
What should you inspect before installing a Codex plugin?
- Confirm the publisher and repository are the ones you intended.
- Read every bundled
SKILL.md; plugin instructions become part of agent behavior. - Inspect MCP commands, remote endpoints, environment variables, and transports.
- Check the license and repository maintenance state.
- Verify the package in the actual Codex marketplace available to your account.
Use the plugin.json validator for Agent Plugins 1.0.0 conformance. That validation is useful, but it is not a malware scan, OpenAI approval, or Codex availability check.
FAQ
Do all verified Agent Plugins work in Codex? No such claim is possible from schema validation alone. The package may be a compatibility candidate, while Codex discovery and installation depend on a configured marketplace and OpenAI's current client behavior.
Is this an official Codex plugins list? No. It is an independent verified census of portable Agent Plugins. OpenAI's Plugins interface is the source of truth for packages currently available in Codex.
Is a Codex plugin the same as an IDE extension? No. A plugin bundles agent-facing capabilities such as skills and tools; an IDE extension is a different distribution surface.
Where can I compare other clients? Use the Agent Plugin install hub for ChatGPT, Cursor, GitHub Copilot, VS Code, and Kiro.
Sources checked 2026-09-21: OpenAI Help — Plugins in Codex and openai/plugins on GitHub.