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Use Flow’s Agent Plugins output for Codex. The package contains workflow skills and a connection to your tools; it does not start the MCP server.

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Prepare the package

Terminal
Use the generated plugins/agent-plugins/ folder:
Package

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Install and test

1

Make the server reachable

Keep the MCP server running. Use loopback for a local client or public HTTPS for a remote environment. Configure user sign-in before exposing account-protected tools.
2

Add the plugin to a supported source

Follow OpenAI’s plugin packaging guide for local or team distribution. OpenAI-specific settings belong under extensions.com.openai in the portable manifest.
3

Check a workflow

Install the plugin, open a new session and ask Codex to perform a task covered by a skill.Check it worked: the skill is available and its tool calls reach /mcp/plugin.
Regenerate after changing skills, then refresh the installed package. Flow does not add a marketplace entry or publish to a directory. For direct tool use without a plugin, connect the MCP server or use the CLI.