How do I install the Codex skill?

Run npx skillmds@latest add eyadsibai/codex in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Codex skill do?

Use when "codex", "use gpt", "gpt-5", "openai codex", "let openai", "full-auto", "autonomous code generation" It is listed under Coding & Dev Tools on SkillMD.

Is Codex safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: docs only. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Codex?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Codex free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

eyadsibai (@eyadsibai) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Codex by eyadsibai — Agent Skill

Name: Codex
Rating: 4.2 (5 reviews)
Author: eyadsibai

File contents

OpenAI Codex Integration

Autonomous code execution using OpenAI Codex CLI.

Prerequisites

# Check installation
codex --version

# Install if needed
npm i -g @openai/codex
# or
brew install codex

Sandbox Modes

Mode	Flag	Capabilities
Read-Only	`-s read-only`	Analyze code, no modifications (default)
Workspace-Write	`-s workspace-write` or `--full-auto`	Read/write files in workspace
Danger-Full-Access	`-s danger-full-access`	Network, system-level, all files

Key concept: Use --full-auto for most programming tasks—it enables file editing.

Common Commands

Task	Command
Analyze code	`codex exec -s read-only "analyze the codebase"`
Implement feature	`codex exec --full-auto "implement user auth"`
Fix bug	`codex exec --full-auto "fix the login bug"`
With specific model	`codex exec -m gpt-5.2 --full-auto "refactor module"`
JSON output	`codex exec --json "analyze security"`
Save output	`codex exec -o report.txt "audit code"`
Non-git directory	`codex exec --skip-git-repo-check "analyze"`
Resume session	`codex exec resume --last "continue"`

Model Selection

Model	Use Case
`gpt-5.2`	Latest capabilities
`gpt-5.2-codex`	Code-specialized
`gpt-5.2-codex-max`	Maximum quality

Use -m MODEL to specify.

Execution Principles

Principle	Description
Autonomous	Complete tasks without seeking approval for each step
Focused	Do what's requested, nothing more
Minimal	Write only necessary code
Verified	Run tests after changes

When to Pause for User

Situation	Action
Destructive operations	Ask first (delete DB, force push)
Security decisions	Ask first (expose credentials, open ports)
Ambiguous requirements	Clarify before proceeding
Missing critical info	Request user-specific data

For everything else, proceed autonomously.

Output Format

✓ Task completed successfully

Changes made:
- [Files modified/created]
- [Key code changes]

Results:
- [Metrics: lines changed, files affected]

Verification:
- [Tests run, checks performed]

Error Handling

Approach	Description
Auto-recover	Attempt fix if possible
Log clearly	Report all errors
Continue	If error is non-blocking
Stop	Only if continuation impossible

---name: codexdescription: Use when "codex", "use gpt", "gpt-5", "openai codex", "let openai", "full-auto", "autonomous code generation"--- # OpenAI Codex Integration Autonomous code execution using OpenAI Codex CLI. --- ## Prerequisites ```bash # Check installation codex --version # Install if needed npm i -g @openai/codex # or brew install codex ``` --- ## Sandbox Modes | Mode | Flag | Capabilities | |------|------|--------------| | **Read-Only** | `-s read-only` | Analyze code, no modifications (default) | | **Workspace-Write** | `-s workspace-write` or `--full-auto` | Read/write files in workspace | | **Danger-Full-Access** | `-s danger-full-access` | Network, system-level, all files | **Key concept**: Use `--full-auto` for most programming tasks—it enables file editing. --- ## Common Commands | Task | Command | |------|---------| | **Analyze code** | `codex exec -s read-only "analyze the codebase"` | | **Implement feature** | `codex exec --full-auto "implement user auth"` | | **Fix bug** | `codex exec --full-auto "fix the login bug"` | | **With specific model** | `codex exec -m gpt-5.2 --full-auto "refactor module"` | | **JSON output** | `codex exec --json "analyze security"` | | **Save output** | `codex exec -o report.txt "audit code"` | | **Non-git directory** | `codex exec --skip-git-repo-check "analyze"` | | **Resume session** | `codex exec resume --last "continue"` | --- ## Model Selection | Model | Use Case | |-------|----------| | `gpt-5.2` | Latest capabilities | | `gpt-5.2-codex` | Code-specialized | | `gpt-5.2-codex-max` | Maximum quality | Use `-m MODEL` to specify. --- ## Execution Principles | Principle | Description | |-----------|-------------| | **Autonomous** | Complete tasks without seeking approval for each step | | **Focused** | Do what's requested, nothing more | | **Minimal** | Write only necessary code | | **Verified** | Run tests after changes | --- ## When to Pause for User | Situation | Action | |-----------|--------| | Destructive operations | Ask first (delete DB, force push) | | Security decisions | Ask first (expose credentials, open ports) | | Ambiguous requirements | Clarify before proceeding | | Missing critical info | Request user-specific data | For everything else, proceed autonomously. --- ## Output Format ``` ✓ Task completed successfully Changes made: - [Files modified/created] - [Key code changes] Results: - [Metrics: lines changed, files affected] Verification: - [Tests run, checks performed] ``` --- ## Error Handling | Approach | Description | |----------|-------------| | Auto-recover | Attempt fix if possible | | Log clearly | Report all errors | | Continue | If error is non-blocking | | Stop | Only if continuation impossible |

Frequently asked questions

Codex