Codex Agent Dev Kit

Use this skill to translate Claude-oriented agent setup material into Codex-native files. Do not copy .claude files verbatim unless the user explicitly wants archival copies; map each concept to a Codex-supported artifact.

Default Targets

• Global reusable skill: %USERPROFILE%\.codex\skills\<skill-name>\SKILL.md
• Project memory and conventions: <repo>\AGENTS.md
• Repo-local plugin bundle: <repo>\plugins\<plugin-name>\.codex-plugin\plugin.json
• Plugin marketplace entry: <repo>\.agents\plugins\marketplace.json
• Deterministic guardrails: helper scripts under a skill or plugin scripts/ folder

Migration Workflow

1. Inventory the source material.

• Identify Claude concepts: CLAUDE.md, .claude/commands, .claude/hooks, .claude/rules, .claude/agents, .claude/settings.json, plugin manifests, and screenshots.
• Separate reusable behavior from repo-specific conventions.

2. Choose the Codex destination.

• Put reusable workflows in a global Codex skill.
• Put repo architecture, commands, test expectations, naming, and local conventions in AGENTS.md.
• Put shareable bundles in a local Codex plugin only when the user needs plugin UI discovery or team distribution.
• Put ongoing skill maintenance behavior in skill-updater rather than mixing health checks into every skill.

3. Translate, do not clone.

• CLAUDE.md memory becomes AGENTS.md or skill instructions.
• Claude slash commands become named workflow sections, default prompts, or executable scripts.
• Claude hooks become explicit guardrail scripts and preflight checks; a skill cannot enforce every tool call by itself.
• Claude rules become AGENTS.md project rules or skill body guidance.
• Claude agents/subagents become delegation guidance. Codex subagents are used only when the user explicitly asks for delegation or parallel agent work.
• Claude settings.json permissions and model values do not port directly. Do not weaken Codex safety settings during migration.
• Claude plugins become Codex plugins with .codex-plugin/plugin.json, skills, optional assets/scripts, and a marketplace entry.

4. Validate the result.

• Run the Codex skill validator for every skill folder.
• Validate plugin JSON, marketplace JSON, and relative paths.
• Run bundled guardrail scripts with a harmless target before relying on them.

Reference Files

• Read references/claude-to-codex-map.md when converting screenshots or .claude folders.
• Read references/codex-plugin-layout.md when creating or fixing a Codex local plugin package.
• Use $skill-updater after migration when a generated skill fails, becomes stale, references old models, or needs a health audit.

Guardrails

• Never import Claude permission allowlists as Codex permissions without reviewing each entry.
• Do not add destructive commands, force-push workflows, or hidden automatic commits.
• Prefer small, explicit scripts over broad "run everything" automation.
• Keep skill frontmatter to name and description; Codex uses those fields for triggering.
• Keep agents/openai.yaml UI metadata short and synchronized with SKILL.md.

Verification Helper

Use scripts/check_codex_agent_kit.ps1 to check that a skill or plugin bundle has the expected Codex files.

Changelog

• [2026-05-08] [HEALTH] Added skill-updater routing so migrated skills can be maintained through failure-driven and usage-based updates.