Agent skill

Codex Review Branch

by sd0xdev in sd0xdev/sd0x-harness

Fully automated review of an entire feature branch using Codex exec

MITAuto-check passedDevelopment

Install Codex Review Branch

skills CLI
$ npx skills add sd0xdev/sd0x-harness --skill codex-review-branch -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install sd0xdev/sd0x-harness codex-review-branch --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/sd0xdev/sd0x-harness.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/codex-review-branch .claude/skills/codex-review-branch && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
codex-review-branch
GitHub stars
192
Token cost
~485 tokens
SKILL.md length
226 words
Files
1
Skills in repo
91
Repo updated
First seen
Licence
MIT

At a glance

Fully automated review of an entire feature branch using Codex exec

  • Development work in your project
  • SKILL.md covers Parent Skill, Variant, Flags and Trigger, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Codex Review Branch is an agent skill from sd0xdev/sd0x-harness. Fully automated review of an entire feature branch using Codex exec

Its SKILL.md is about 490 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. The repository describes itself as: The harness layer for Claude Code — a reference implementation of harness engineering with hook-enforced dual review, state-machine gates that survive context compaction, and… The licence is MIT.

When your agent uses it

  • Development work in your project

Example prompts

  • “/codex-review-branch”

Requirements

  • Pre-approved tools (allowed-tools): Bash(git:*), Bash(bash:*), Read, Grep, Glob, Task, Monitor

What it can do on your machine

Read from SKILL.md and the folder at commit c9a2036. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Bash(git:*)
    • Bash(bash:*)
    • Read
    • Grep
    • Glob
    • Task
    • Monitor

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Codex Review Branch loads about 485 tokens when it runs. Until then it costs about 22 tokens; SKILL.md has 226 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~22
When it runs · the whole SKILL.md, loaded when a task matches
~485

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from sd0xdev/sd0x-harness at commit c9a2036, republished under its MIT licence (© sd0xdev). 226 words, ~485 tokens.

Download SKILL.mdSave it as .claude/skills/codex-review-branch/SKILL.md (or your agent's skills folder).
name
codex-review-branch
description
Fully automated review of an entire feature branch using Codex exec
allowed-tools
Bash(git:*), Bash(bash:*), Read, Grep, Glob, Task, Monitor

Codex Review Branch

Thin entry-point skill — routes to the parent skill for full workflow.

Parent Skill

This is the Branch variant of codex-code-review. Full workflow, prompt templates, and review logic are defined in the parent skill.

See @skills/codex-code-review/SKILL.md

Variant

PropertyValue
ScopeFull branch (all commits since base)
Pre-checksNone
Prompt template@skills/codex-code-review/references/codex-prompt-branch.md
ReviewersCodex alone. --dual adds a secondary reviewer — off unless the flag is passed
Tierthorough (this is the depth variant — P0/P1/P2 block, round cap 30)

Flags

FlagDefaultEffect
--dualoffAdds a second reviewer in parallel (see parent skill Step 3). The merge happens in conversation — no state write, no mode field, and the next invocation starts single again unless the flag is passed again. A second opinion that can block this review's gate. Use for releases, security-sensitive changes, and public API surfaces.

--dual is the only code-review entry point where two reviewers run. /codex-review-fast and /codex-review-doc are single-reviewer by design and offer no such flag: the cost of the second opinion is only worth paying where the change warrants it, and this is that variant. /plan-review --dual is the plan-mode counterpart — same opt-in shape, same default of off, a different loop.

Trigger

  • Keywords: branch review, full branch, review branch, codex-review-branch

When NOT to Use

  • Quick diff-only review (use /codex-review-fast)
  • Full review with lint + build (use /codex-review)
  • Document review (use /codex-review-doc)

© sd0xdev, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/codex-review-branch of sd0xdev/sd0x-harness.

Open the folder on GitHubat commit c9a2036

Compare with similar skills

Codex Review Branch next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Codex Review Branch compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Codex Review Branch this skillsd0xdev/sd0x-harness192—~485Automated safety check: PassMIT
Finishing a Development Branchobra/superpowers296k5 repos~1.9kAutomated safety check: PassMIT
Typescript Advanced Typesrolling-scopes/rsschool-app10k24 repos~4.2kAutomated safety check: PassMPL-2.0
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT
Greplooponyx-dot-app/onyx32k4 repos~3.3kAutomated safety check: PassMIT

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Categories

Questions about Codex Review Branch

What does Codex Review Branch do?

Fully automated review of an entire feature branch using Codex exec. Codex Review Branch is an agent skill from sd0xdev/sd0x-harness.

When should I use Codex Review Branch?

Codex Review Branch fits situations like: development work in your project.

How do I install Codex Review Branch in Claude Code?

Run `npx skills add sd0xdev/sd0x-harness --skill codex-review-branch -a claude-code`. Or copy the skill folder (skills/codex-review-branch in sd0xdev/sd0x-harness) into .claude/skills/codex-review-branch in your project. Claude Code loads it when a task matches its description.

How do I install Codex Review Branch in Codex?

Run `npx skills add sd0xdev/sd0x-harness --skill codex-review-branch -a codex`. Or copy the skill folder (skills/codex-review-branch in sd0xdev/sd0x-harness) into .agents/skills/codex-review-branch in your project. Codex loads it when a task matches its description.

Can I use Codex Review Branch in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add sd0xdev/sd0x-harness --skill codex-review-branch -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/codex-review-branch, .gemini/skills/codex-review-branch, .github/skills/codex-review-branch and .opencode/skills/codex-review-branch in your project.

What does Codex Review Branch need to run?

SKILL.md names no scripts, command-line tools or credentials: Codex Review Branch is instructions for the agent only. Its frontmatter pre-approves these tools: Bash(git:*), Bash(bash:*), Read, Grep, Glob, Task, Monitor.

Does Codex Review Branch access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Codex Review Branch safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Codex Review Branch use?

Codex Review Branch is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Codex Review Branch use?

About 485 tokens (SKILL.md is roughly 1.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Codex Review Branch?

Skills that share tags, products or a category with Codex Review Branch: Finishing a Development Branch (obra/superpowers, 296k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars), PR Babysitter (openinterpreter/openinterpreter, 69k stars) and Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Codex Review Branch?

sd0xdev (a GitHub user) maintains it in sd0xdev/sd0x-harness, which has 192 GitHub stars. The repository holds 91 skills in this directory. The repository was last updated on October 6, 2026.

Source: sd0xdev/sd0x-harness on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.