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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/nousresearch/hermes-agent --skill codex- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads codex automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
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_KEYor Codex OAuth credentials from the Codex CLI login flow - Must run inside a git repository — Codex refuses to run outside one
- Use
pty=truein 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 $(mktemp -d) && git init && codex exec 'Build a snake game in Python'", pty=true)
Background Mode (Long Tasks)
# Start in background with PTY
terminal(command="codex exec --sandbox workspace-write 'Refactor the auth module'", workdir="~/project", background=true, pty=true)
# Returns session_id
# Monitor progress
process(action="poll", session_id="<id>")
process(action="log", session_id="<id>")
# Send input if Codex asks a question
process(action="submit", session_id="<id>", data="yes")
# Kill if needed
process(action="kill", session_id="<id>")
Key Flags
| Flag | Effect |
|---|---|
exec "prompt" | One-shot execution, exits when done |
--sandbox workspace-write (-s) | Sandboxed but auto-approves file changes in the workspace (the recommended auto-build mode) |
--dangerously-bypass-approvals-and-sandbox | No sandbox, no approvals (fastest, most dangerous; --yolo still works as a hidden alias) |
--sandbox danger-full-access | No Codex sandbox; useful when the host service context breaks bubblewrap |
Deprecated:
--full-autostill works but the live CLI warns to use--sandbox workspace-writeinstead.
Hermes Gateway Caveat
When invoking the Codex CLI from a Hermes gateway/service context (for example,
Telegram-driven agent sessions), Codex workspace-write sandboxing may fail even
when the same command works in the user's interactive shell. A typical symptom is
bubblewrap/user-namespace errors such as setting up uid map: Permission denied
or loopback: Failed RTM_NEWADDR: Operation not permitted.
In that context, prefer:
codex exec --sandbox danger-full-access "<task>"
Use process boundaries as the safety layer instead: explicit workdir, clean git
status before launch, narrow task prompts, git diff review, targeted tests, and
human/agent confirmation before committing broad changes.
PR Reviews
Clone to a temp directory for safe review:
terminal(command="REVIEW=$(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 ~/.hermes/cache/scratch/issue-78 main", workdir="~/project")
terminal(command="git worktree add -b fix/issue-99 ~/.hermes/cache/scratch/issue-99 main", workdir="~/project")
# Launch Codex in each
terminal(command="codex --sandbox workspace-write exec 'Fix issue #78: <description>. Commit when done.'", workdir="~/.hermes/cache/scratch/issue-78", background=true, pty=true)
terminal(command="codex --sandbox workspace-write exec 'Fix issue #99: <description>. Commit when done.'", workdir="~/.hermes/cache/scratch/issue-99", background=true, pty=true)
# Monitor
process(action="list")
# After completion, push and create PRs
terminal(command="cd ~/.hermes/cache/scratch/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 ~/.hermes/cache/scratch/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 initfor scratch - Use
execfor one-shots —codex exec "prompt"runs and exits cleanly --sandbox workspace-writefor building — auto-approves changes within the sandbox (--full-autois deprecated for this)- Background for long tasks — use
background=trueand monitor withprocesstool - 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
FAQ
What does the codex skill do?
Delegate coding to OpenAI Codex CLI (features, PRs).
How do I install codex?
Run npx skills add https://github.com/nousresearch/hermes-agent --skill codex in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/codex/ (personal) or .claude/skills/codex/ (project).
Which AI agents can use codex?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is codex safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains codex?
It is published by nousresearch in nousresearch/hermes-agent. It has 415 recorded installs.
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