Use Codex (OpenAI’s codex app-server) as a full agent provider — planning, tool orchestration, MCP tools, server-side history, session resume — alongside or instead of Claude. ChatGPT subscription or OpenAI API key…

Agent skill published as a SKILL.md in nanocoai/nanoclaw (folder .claude/skills/add-codex). Install it with one command using the open skills CLI, or copy the folder into ~/.claude/skills/.