# Hook Development > Design and implement Codex guardrail hooks and policy checks using repository automation (scripts/CI/pre-commit) plus AGENTS.md rules. Use when user asks to prevent risky actions, enforce standards, or validate operations before/after changes. Use when this capability is needed. - Skill: `tomevault-io/hook-development-4` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/hook-development-4` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/hook-development-4/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/hook-development-4 --- # Hook Development (Codex) Codex does not use Claude plugin hooks directly. Build equivalent guardrails with repository-native tooling. ## Preferred Mechanisms 1. `AGENTS.md` for behavioral policy. 2. Pre-commit/CI checks for enforcement. 3. Wrapper scripts or Make targets for safe workflows. ## Workflow 1. Define the exact unsafe behavior to catch. 2. Add deterministic checks (lint/static/security/tests) with clear failure output. 3. Keep checks fast and scoped. 4. Add bypass policy only if necessary and auditable. 5. Document remediation steps for each failure. --- > Source: [rldyourmnd/codex-cli-bootstrap](https://github.com/rldyourmnd/codex-cli-bootstrap) — distributed by [TomeVault](https://tomevault.io).