Agent-Skills.md

Agent Skills: Codex CLI Skill

Shell out to OpenAI Codex CLI for headless code generation, analysis, and question-answering. Optimized for code tasks. Requires OPENAI_API_KEY env var.

UncategorizedID: oimiragieo/agent-studio/omega-codex-cli

Repository

oimiragieo/agent-studio
oimiragieo
19

Install this agent skill to your local

pnpm dlx add-skill https://github.com/oimiragieo/agent-studio/tree/HEAD/.claude/skills/omega-codex-cli

Skill Files

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.claude/skills/omega-codex-cli/SKILL.md

Skill Metadata

Name
omega-codex-cli
Description
Shell out to OpenAI Codex CLI for headless code generation, analysis, and question-answering. Optimized for code tasks. Requires OPENAI_API_KEY env var.

Codex CLI Skill

Headless wrapper for OpenAI Codex CLI. Passes prompt as positional arg to codex exec "PROMPT". Optimized for code generation and analysis. Requires OPENAI_API_KEY.

When to Use

  • Code generation tasks needing OpenAI/GPT model perspective
  • Cross-validation of code solutions with a non-Claude model
  • Tasks benefiting from Codex's code optimization focus
  • Multi-LLM consultation workflows

Usage

Ask a question

node .claude/skills/omega-codex-cli/scripts/ask-codex.mjs "Implement a Redis caching layer for Express"

With timeout

node .claude/skills/omega-codex-cli/scripts/ask-codex.mjs "Refactor this module" --timeout-ms 120000

JSONL streaming output

node .claude/skills/omega-codex-cli/scripts/ask-codex.mjs "Generate unit tests" --json

Sandbox mode

node .claude/skills/omega-codex-cli/scripts/ask-codex.mjs "Write and test a sort algorithm" --sandbox

Availability Check

node .claude/skills/omega-codex-cli/scripts/verify-setup.mjs
# Exit 0 = available (CLI found + OPENAI_API_KEY set)
# Exit 1 = not available

Scripts

| Script | Purpose | | ------------------- | ---------------------------------------------------------- | | ask-codex.mjs | Core headless wrapper — prompt as positional arg | | parse-args.mjs | Argument parser (--model, --json, --sandbox, --timeout-ms) | | verify-setup.mjs | Availability check (CLI + OPENAI_API_KEY) | | format-output.mjs | JSONL event stream normalization |

Models

| Model ID | Description | When to Use | | ------------------- | ------------------------------------------------------------------------------- | ---------------------------------------------------- | | codex-mini-latest | Default. Fine-tuned o4-mini. Low-latency code Q&A. $1.50/$6 per 1M. | Fast code questions, CI pipelines, high-volume calls | | gpt-5.4 | Full GPT-5.4 (released ~2026-03-05). 1M context, computer-use, top coding perf. | Complex multi-file tasks, computer-use agentic flows | | gpt-5.4-pro | Pro variant of GPT-5.4. Higher capacity, higher cost. | State-of-the-art coding benchmarks, research tasks |

Default model: codex-mini-latest — fine-tuned o4-mini optimized for low-latency code Q&A with a 75% caching discount. Do not override unless you need GPT-5.4's extended context or computer-use capability.

To use GPT-5.4:

node .claude/skills/omega-codex-cli/scripts/ask-codex.mjs "PROMPT" --model gpt-5.4

Pricing (codex-mini-latest): $1.50/1M input tokens · $6/1M output tokens · 75% caching discount

Flags

| Flag | Description | | ---------------- | ------------------------------------------------------------------------------------------ | | --model MODEL | Override model (default: codex-mini-latest). Use gpt-5.4 or gpt-5.4-pro for GPT-5.4. | | --json | JSONL event stream output | | --sandbox | Workspace-write sandbox mode | | --timeout-ms N | Timeout in milliseconds (exit code 124 on expiry) |

Exit Codes

| Code | Meaning | | ---- | ------------------------------------------ | | 0 | Success | | 1 | Error (CLI failure, auth issue, API error) | | 124 | Timeout (--timeout-ms exceeded) |

Anti-Patterns & Iron Laws

  1. ALWAYS verify OPENAI_API_KEY is set before invocation
  2. NEVER use stdin for prompt delivery — Codex uses positional arg
  3. ALWAYS include --skip-git-repo-check (built into wrapper)
  4. ALWAYS set --timeout-ms for production usage
  5. NEVER assume --json output is standard JSON — it produces JSONL event stream

Integration Notes

  • API key: OPENAI_API_KEY env var required
  • Rate limits: OpenAI API rate limits apply
  • Platform: Full cross-platform (Windows uses cmd.exe /d /s /c wrapper)

Memory Protocol (MANDATORY)

Before starting: Read .claude/context/memory/learnings.md

After completing:

  • New pattern -> .claude/context/memory/learnings.md
  • Issue found -> .claude/context/memory/issues.md
  • Decision made -> .claude/context/memory/decisions.md

ASSUME INTERRUPTION: If it's not in memory, it didn't happen.

Note: Use pnpm search:code to discover references to this skill codebase-wide.