Add OpenAI Codex plugin support

[YunosukeYoshino]

Summary

This repository is already useful across AI coding agents, and it would be great to make it installable as an OpenAI Codex plugin as well.

OpenAI Codex now supports plugins that can bundle skills, MCP servers, and app integrations:

https://developers.openai.com/codex/plugins

Why

marketingskills has already moved toward being more agent-agnostic, and Codex plugin support would make it easier for Codex users to discover, install, and use these marketing skills without custom setup.

This could also make the repository more compatible with the broader AI agent ecosystem, especially for users who are not primarily using Claude Code.

Suggested approach

Add a Codex plugin manifest/configuration so the skills in this repository can be installed through Codex's plugin system.

At a high level, this may involve:

• Adding the required Codex plugin metadata
• Mapping the existing skills into the plugin structure
• Documenting installation and usage from Codex
• Keeping the existing Claude Code / skillkit workflows working

Reference

OpenAI Codex plugin documentation:

https://developers.openai.com/codex/plugins

[kernelalex]

You could just install marketingskills via npx skills add and it would be added as a skill on Codex. What advantage would a dedicated Codex plugin give us over skills ?

[debabratasaha-dev]

Just download the skills however you want and put it in C:\Users\User Name\.agents\skills and all the skills will be available in the codex skills. But if you think it would give us addtional features/advantages then tell us.

[AbbasAllawy]

i tried to install skills through claude code it's failed as below:

✻ Worked for 17s · 2 shells still running

● Background command "Install marketingskills via skillkit" failed with exit code 1
● The install failed due to a security scan. Here's what happened:

Result: 41 skills downloaded, but installation aborted on the 11th (competitor-profiling) due to a HIGH severity finding.

The blocking issue — competitor-profiling/SKILL.md:24:

• [TA002] Autonomy abuse: the skill contains the line "If the user provides URLs and context is available, proceed without asking." — this is a prompt-injection pattern telling the AI to bypass user
  confirmation.
• Plus 3 medium YAML front-matter injection findings in the same skill.

The 10 skills scanned before it (ab-testing, ad-creative, ads, ai-seo, analytics, aso, churn-prevention, co-marketing, cold-email, community-marketing) all had medium warnings too but didn't block.

[clairernovotny]

You could just install marketingskills via npx skills add and it would be added as a skill on Codex. What advantage would a dedicated Codex plugin give us over skills ?

The advantage is that it makes it much easier to update. Plugins maintain a link to the source repo and have update commands. Skills installed don't always, and it very much depends on how they get installed.

[YunosukeYoshino]

You could just install marketingskills via npx skills add and it would be added as a skill on Codex. What advantage would a dedicated Codex plugin give us over skills ?

Above all, I cannot really imagine non-engineers using the terminal. Adding and updating plugins via a GUI would likely be a positive experience even for engineers.