How do I install the Codex Exec skill?

Run npx skillmds@latest add tomevault-io/codex-exec 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.

Is Codex Exec safe to use?

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Which AI agents work with Codex Exec?

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 Exec free to use?

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

Who published Codex Exec?

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

Codex Exec by tomevault-io — Agent Skill

Name: Codex Exec
Author: tomevault-io

Codex Exec

Execute codex CLI as sub-agent for thorough code reviews (codex's specialty), alternative approaches when stuck, or complex problems requiring extended investigation. Note that inference takes significant time. Use when this capability is needed.

tomevault-io Updated Sep 17, 2026

File contents

Codex Execution Skill

Command Structure

Execute codex using the following command pattern:

codex exec --full-auto --sandbox read-only --cd <project_directory> "<request>"

Parameters

--full-auto: Enables autonomous operation without manual intervention
--sandbox read-only: Runs in safe read-only mode (no file modifications)
--cd <directory>: Specifies the project directory to analyze
<request>: The natural language request describing what to analyze

Execution Guidelines

1. Determine the Request

Formulate a clear, specific request. Examples:

"Review the authentication module for security vulnerabilities"
"Analyze the database query patterns for performance issues"
"Explain how the user registration flow works"

2. Set Working Directory

Default: $PWD
Custom: User-provided path

3. Execute & Monitor

codex exec --full-auto --sandbox read-only --cd /path/to/project "Your request"

Display output, progress, errors, and final results to user.

Example Usage Patterns

Code Review

codex exec --full-auto --sandbox read-only --cd . "Review the recent changes for code quality and potential bugs"

Architecture Analysis

codex exec --full-auto --sandbox read-only --cd . "Analyze the overall architecture and identify design patterns used"

Bug Investigation

codex exec --full-auto --sandbox read-only --cd . "Investigate why the user authentication is failing intermittently"

Refactoring Suggestions

codex exec --full-auto --sandbox read-only --cd . "Suggest refactoring opportunities to improve code maintainability"

Prerequisites

Ensure the codex CLI tool is installed and available in PATH:

which codex

Converted and distributed by TomeVault — claim your Tome and manage your conversions.

---name: codex-execdescription: Execute codex CLI as sub-agent for thorough code reviews (codex's specialty), alternative approaches when stuck, or complex problems requiring extended investigation. Note that inference takes significant time. Use when this capability is needed.---# Codex Execution Skill## Command StructureExecute codex using the following command pattern:```bashcodex exec --full-auto --sandbox read-only --cd <project_directory> "<request>"```### Parameters- `--full-auto`: Enables autonomous operation without manual intervention- `--sandbox read-only`: Runs in safe read-only mode (no file modifications)- `--cd <directory>`: Specifies the project directory to analyze- `<request>`: The natural language request describing what to analyze## Execution Guidelines### 1. Determine the RequestFormulate a clear, specific request. Examples:- "Review the authentication module for security vulnerabilities"- "Analyze the database query patterns for performance issues"- "Explain how the user registration flow works"### 2. Set Working Directory- Default: `$PWD`- Custom: User-provided path### 3. Execute & Monitor```bashcodex exec --full-auto --sandbox read-only --cd /path/to/project "Your request"```Display output, progress, errors, and final results to user.## Example Usage Patterns### Code Review```bashcodex exec --full-auto --sandbox read-only --cd . "Review the recent changes for code quality and potential bugs"```### Architecture Analysis```bashcodex exec --full-auto --sandbox read-only --cd . "Analyze the overall architecture and identify design patterns used"```### Bug Investigation```bashcodex exec --full-auto --sandbox read-only --cd . "Investigate why the user authentication is failing intermittently"```### Refactoring Suggestions```bashcodex exec --full-auto --sandbox read-only --cd . "Suggest refactoring opportunities to improve code maintainability"```## PrerequisitesEnsure the `codex` CLI tool is installed and available in PATH:```bashwhich codex```---> Converted and distributed by [TomeVault](https://tomevault.io/claim/kecbigmt) — claim your Tome and manage your conversions.

Frequently asked questions