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skill CX Codex

explain-pr — Claude Code skill: what it does, how to install

Summarizes any pull request by fetching its diff and description through GitHub CLI, explaining the core problem and the proposed fix.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add dyoshikawa/rulesync --skill explain-pr -a claude-code
Open on GitHub

What explain-pr does

This skill explains GitHub pull requests without manual context gathering. If you do not pass a PR number, the agent targets the PR for your active git branch. Information retrieval runs in parallel using gh pr view and gh pr diff.

The resulting summary focuses on two points: the motivation behind the change and the technical solution. Explanations match the language of your current conversation. The tool relies on a working gh binary, so unauthenticated environments will fail immediately.

What it helps with

  • understand the motivation behind a pull request quickly
  • summarize technical decisions from a large diff
  • review the current branch PR without leaving the editor

Example prompts for the agent

  • Explain PR #142
  • Summarize the pull request for this branch
  • What problem does PR 45 solve?

How to install explain-pr

1Skills CLI (Vercel)

npx skills add dyoshikawa/rulesync --skill explain-pr -a claude-code

2Manually: put the files in place

~/.claude/skills/explain-pr/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/explain-pr/

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about explain-pr

How to install explain-pr in Claude Code?

Run npx skills add dyoshikawa/rulesync --skill explain-pr -a claude-code. The skill file is placed into ~/.claude/skills/explain-pr/SKILL.md.

What does the explain-pr skill do?

It inspects PR metadata and diffs via GitHub CLI, then outlines the original issue and the chosen implementation approach.

What prerequisites are required for explain-pr?

You need the GitHub CLI (gh) installed and logged in to query repository pull requests and diffs.

Source text

SKILL.md · MIT 
---
name: explain-pr
description: "Explain a PR: the background problem and the proposed solution"
targets:
  - "*"
---

target_pr = the user's request

If target_pr is not provided, use the PR of the current branch.

## Step 1: Gather PR Information

Run the following in parallel:

- Get the PR description and metadata: `gh pr view <pr_number>`
- Get the PR diff: `gh pr diff <pr_number>`

## Step 2: Analyze and Explain

Based on the PR content, explain the following two aspects:

1. **Background (Problem/Motivation):** What issue or limitation existed before this PR? Why was this change needed?
2. **Solution:** What approach does this PR take to address the problem? Summarize the key changes and design decisions.

Keep the explanation concise and focused. Use the language of the current conversation (follow the user's language).

© dyoshikawa · MIT · dyoshikawa/rulesync

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