Feature request: Support for plugin marketplaces

The problem

I use both Claude Code and Codex, and there's a gap in extensibility.

Claude Code has a plugin marketplace system that lets me install community-built extensions with one command. Things like custom slash commands, specialized agents, hooks, and MCP servers — all shareable and version-tracked.

For example, I've got playwright-skill installed which lets Claude run browser automation tasks. There are other plugins for code review workflows, deployment helpers, etc.

Codex doesn't have an equivalent system. When I switch between the two tools, I lose access to all these extensions.

What I'd like

A plugin/extension system in Codex that enables:

• Installing third-party tools from Git repositories
• Sharing custom capabilities across teams
• Community-driven ecosystem of extensions

This would bring Codex closer to parity with Claude Code's extensibility model.

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Codex: 0.79.0 · Platform: macOS arm64