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- AGENTS.md: universal cross-tool file read by Claude Code, Cursor, Codex, and OpenCode - .cursor/: 15 hook events via hooks.json, 16 hook scripts with DRY adapter pattern, 29 rules (9 common + 20 language-specific) with Cursor YAML frontmatter - .codex/: reference config.toml, Codex-specific AGENTS.md supplement, 10 skills ported to .agents/skills/ with openai.yaml metadata - .opencode/: 3 new tools (format-code, lint-check, git-summary), 3 new hooks (shell.env, experimental.session.compacting, permission.ask), expanded instructions, version bumped to 1.6.0 - README: fixed Cursor section, added Codex section, added cross-tool parity table - install.sh: now copies hooks.json + hooks/ for --target cursor
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ECC for Codex CLI
This supplements the root AGENTS.md with Codex-specific guidance.
Model Recommendations
| Task Type | Recommended Model |
|---|---|
| Routine coding, tests, formatting | o4-mini |
| Complex features, architecture | o3 |
| Debugging, refactoring | o4-mini |
| Security review | o3 |
Skills Discovery
Skills are auto-loaded from .agents/skills/. Each skill contains:
SKILL.md— Detailed instructions and workflowagents/openai.yaml— Codex interface metadata
Available skills:
- tdd-workflow — Test-driven development with 80%+ coverage
- security-review — Comprehensive security checklist
- coding-standards — Universal coding standards
- frontend-patterns — React/Next.js patterns
- backend-patterns — API design, database, caching
- e2e-testing — Playwright E2E tests
- eval-harness — Eval-driven development
- strategic-compact — Context management
- api-design — REST API design patterns
- verification-loop — Build, test, lint, typecheck, security
MCP Servers
Configure in ~/.codex/config.toml under [mcp_servers]. See .codex/config.toml for reference configuration with GitHub, Context7, Memory, and Sequential Thinking servers.
Key Differences from Claude Code
| Feature | Claude Code | Codex CLI |
|---|---|---|
| Hooks | 8+ event types | Not yet supported |
| Context file | CLAUDE.md + AGENTS.md | AGENTS.md only |
| Skills | Skills loaded via plugin | .agents/skills/ directory |
| Commands | /slash commands |
Instruction-based |
| Agents | Subagent Task tool | Single agent model |
| Security | Hook-based enforcement | Instruction + sandbox |
| MCP | Full support | Command-based only |
Security Without Hooks
Since Codex lacks hooks, security enforcement is instruction-based:
- Always validate inputs at system boundaries
- Never hardcode secrets — use environment variables
- Run
npm audit/pip auditbefore committing - Review
git diffbefore every push - Use
sandbox_mode = "workspace-write"in config