# Diff Quality Review

Review a diff for bugs, security, load, missing tests and code to delete.

- Repository: https://github.com/DietrichGebert/ponytail (182067 stars)
- Category: Git and review
- License: MIT
- Last updated: 2026-10-29
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add DietrichGebert/ponytail --skill ponytail-review -g -a claude-code -y`
Codex: `npx skills add DietrichGebert/ponytail --skill ponytail-review -g -a codex -y`
Cursor: `npx skills add DietrichGebert/ponytail --skill ponytail-review -g -a cursor -y`
Gemini CLI: `npx skills add DietrichGebert/ponytail --skill ponytail-review -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add DietrichGebert/ponytail`

## Description

Quality review of a diff: bugs, security, real load, missing tests, speed, and what to delete. Each finding says what goes wrong and how to fix it.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

Review a change like the senior developer who will be paged when it breaks.
Order of importance: correct, safe, holds under load, tested, fast, lean.
Lean still matters: every extra line must be read, tested and fixed later.
This is a report the user asked for, so give it in full.

## 1. Understand first

- Review what the user names: uncommitted or staged changes, a branch, a PR
  link, or files. Nothing named: the uncommitted changes, or the last commit
  if there are none.
- Read the diff, then the code it touches: callers of every changed function,
  the functions it calls, the tests, the README.
- Trace the real flow: where data comes in, what is stored, what goes out.
- A change can break code it does not touch. When a signature, return value
  or behavior changes, grep every caller.
- Find the expected load in the repo (README, deploy config): one person
  running a script, or many users and processes at once. Judge scale against
  that, and say which load you assumed.

## 2. Look for

The rest: https://github.com/DietrichGebert/ponytail/blob/HEAD/.openclaw/skills/ponytail-review/SKILL.md