Codex — Delegate coding to OpenAI Codex CLI (features, PRs)

Codex

Delegate coding to OpenAI Codex CLI (features, PRs).

Skill metadata


Source	Bundled (installed by default)
Path	`skills/autonomous-ai-agents/codex`
Version	`1.0.0`
Author	Hermes Agent
License	MIT
Tags	`Coding-Agent`, `Codex`, `OpenAI`, `Code-Review`, `Refactoring`
Related skills	`claude-code`, `hermes-agent`

Reference: full SKILL.md

The following is the complete skill definition that Hermes loads when this skill is triggered. This is what the agent sees as instructions when the skill is active.

Codex CLI

Delegate coding tasks to Codex via the Hermes terminal. Codex is OpenAI’s autonomous coding agent CLI.

When to use

Building features
Refactoring
PR reviews
Batch issue fixing

Requires the codex CLI and a git repository.

Prerequisites

Codex installed: npm install -g @openai/codex
OpenAI auth configured: either OPENAI_API_KEY or Codex OAuth credentials from the Codex CLI login flow
Must run inside a git repository — Codex refuses to run outside one
Use pty=true in terminal calls — Codex is an interactive terminal app

For Hermes itself, model.provider: openai-codex uses Hermes-managed Codex OAuth from ~/.hermes/auth.json after hermes auth add openai-codex. For the standalone Codex CLI, a valid CLI OAuth session may live under ~/.codex/auth.json; do not treat a missing OPENAI_API_KEY alone as proof that Codex auth is missing.

One-Shot Tasks

terminal(command="codex exec 'Add dark mode toggle to settings'", workdir="~/project", pty=true)

For scratch work (Codex needs a git repo):

terminal(command="cd $(mktemp -d) && git init && codex exec 'Build a snake game in Python'", pty=true)

Background Mode (Long Tasks)

# Start in background with PTY
terminal(command="codex exec --full-auto 'Refactor the auth module'", workdir="~/project", background=true, pty=true)
# Returns session_id

# Monitor progress
process(action="poll", session_id="<id>")
process(action="log", session_id="<id>")

# Send input if Codex asks a question
process(action="submit", session_id="<id>", data="yes")

# Kill if needed
process(action="kill", session_id="<id>")

Key Flags

Flag	Effect
`exec "prompt"`	One-shot execution, exits when done
`--full-auto`	Sandboxed but auto-approves file changes in workspace
`--yolo`	No sandbox, no approvals (fastest, most dangerous)

PR Reviews

Clone to a temp directory for safe review:

terminal(command="REVIEW=$(mktemp -d) && git clone https://github.com/user/repo.git $REVIEW && cd $REVIEW && gh pr checkout 42 && codex review --base origin/main", pty=true)

Parallel Issue Fixing with Worktrees

# Create worktrees
terminal(command="git worktree add -b fix/issue-78 /tmp/issue-78 main", workdir="~/project")
terminal(command="git worktree add -b fix/issue-99 /tmp/issue-99 main", workdir="~/project")

# Launch Codex in each
terminal(command="codex --yolo exec 'Fix issue #78: <description>. Commit when done.'", workdir="/tmp/issue-78", background=true, pty=true)
terminal(command="codex --yolo exec 'Fix issue #99: <description>. Commit when done.'", workdir="/tmp/issue-99", background=true, pty=true)

# Monitor
process(action="list")

# After completion, push and create PRs
terminal(command="cd /tmp/issue-78 && git push -u origin fix/issue-78")
terminal(command="gh pr create --repo user/repo --head fix/issue-78 --title 'fix: ...' --body '...'")

# Cleanup
terminal(command="git worktree remove /tmp/issue-78", workdir="~/project")

Batch PR Reviews

# Fetch all PR refs
terminal(command="git fetch origin '+refs/pull/*/head:refs/remotes/origin/pr/*'", workdir="~/project")

# Review multiple PRs in parallel
terminal(command="codex exec 'Review PR #86. git diff origin/main...origin/pr/86'", workdir="~/project", background=true, pty=true)
terminal(command="codex exec 'Review PR #87. git diff origin/main...origin/pr/87'", workdir="~/project", background=true, pty=true)

# Post results
terminal(command="gh pr comment 86 --body '<review>'", workdir="~/project")

Rules

Always use pty=true — Codex is an interactive terminal app and hangs without a PTY
Git repo required — Codex won’t run outside a git directory. Use mktemp -d && git init for scratch
Use exec for one-shots — codex exec "prompt" runs and exits cleanly
--full-auto for building — auto-approves changes within the sandbox
Background for long tasks — use background=true and monitor with process tool
Don’t interfere — monitor with poll/log, be patient with long-running tasks
Parallel is fine — run multiple Codex processes at once for batch work