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Agent skill

Diff Analyze

by dyoshikawa in dyoshikawa/rulesync

Analyze the differences between the current branch and origin/main, and summarize the current work progress

MITAuto-check passedDevelopment

Install Diff Analyze

skills CLI
$ npx skills add dyoshikawa/rulesync --skill diff-analyze -a claude-code

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

GitHub CLI
$ gh skill install dyoshikawa/rulesync diff-analyze --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/dyoshikawa/rulesync.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.rulesync/skills/diff-analyze .claude/skills/diff-analyze && 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
diff-analyze
GitHub stars
1.5k
Token cost
~245 tokens
SKILL.md length
103 words
Files
1
Skills in repo
40
Repo updated
First seen
Licence
MIT

At a glance

Analyze the differences between the current branch and origin/main, and summarize the current work progress

  • Works in 4 steps: Refresh Main Branch → Inspect the Diff → Inspect Commit History → …
  • Development work in your project
  • SKILL.md covers Step 1: Refresh Main Branch, Step 2: Inspect the Diff, Step 3: Inspect Commit History and Step 4: Summarize the Work
  • Calls git

What it does

Diff Analyze is an agent skill from dyoshikawa/rulesync. Analyze the differences between the current branch and origin/main, and summarize the current work progress

Its SKILL.md is about 250 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: A Utility CLI for AI Coding Agents. The licence is MIT.

When your agent uses it

  • Development work in your project

Example prompts

  • “/diff-analyze”

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Refresh Main Branch
  2. Inspect the Diff
  3. Inspect Commit History
  4. Summarize the Work

What it can do on your machine

Read from SKILL.md and the folder at commit 85bcaf6. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • git

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

  • Network

    No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.

    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

Diff Analyze loads about 245 tokens when it runs. Until then it costs about 30 tokens; SKILL.md has 103 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~30
When it runs · the whole SKILL.md, loaded when a task matches
~245

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 dyoshikawa/rulesync at commit 85bcaf6, republished under its MIT licence (© dyoshikawa). 103 words, ~245 tokens.

Download SKILL.mdSave it as .claude/skills/diff-analyze/SKILL.md (or your agent's skills folder).
name
diff-analyze
description
Analyze the differences between the current branch and origin/main, and summarize the current work progress
targets
*

Diff Analyze

Analyze the differences between the current branch and origin/main, and summarize the current work progress.

Step 1: Refresh Main Branch

Fetch the latest main branch state:

bash
git fetch origin main

Step 2: Inspect the Diff

Get the differences between the current branch and main:

bash
git diff origin/main...HEAD

Step 3: Inspect Commit History

Get the commit history of the current branch since it diverged from main:

bash
git log origin/main..HEAD --oneline

Step 4: Summarize the Work

Based on the diff and commit history, summarize:

  • The main purpose of the current changes
  • The notable files or areas affected
  • The current implementation progress
  • Any obvious risks, gaps, or follow-up work

Keep the summary concise and practical.

© dyoshikawa, 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 .rulesync/skills/diff-analyze of dyoshikawa/rulesync.

Open the folder on GitHubat commit 85bcaf6

Compare with similar skills

Diff Analyze 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.

Diff Analyze compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Diff Analyze this skilldyoshikawa/rulesync1.5k—~245Automated safety check: PassMIT
Vercel Composition Patternssupabase/supabase111k59 repos~726Automated safety check: PassMIT
Finishing a Development Branchobra/superpowers296k5 repos~1.9kAutomated safety check: PassMIT
Typescript Advanced Typesrolling-scopes/rsschool-app10k25 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

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All 40 skills in this repo

  • Rulesync Feature Research

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  • Commit Push PR

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  • Git Worktree Runner

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    Manages git worktrees using git-worktree-runner (gtr). An agent skill from dyoshikawa/rulesync.

    1.5k GitHub stars~1.3k tokensUpdated today
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  • Goal PR

    dyoshikawa/rulesync

    Drive a pull request to a clean state and merge it: run the review-pr skill, fix every mid-or-above finding, and repeat until no mid-or-above findings remain, then merge.

    1.5k GitHub stars~1.4k tokensUpdated today
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  • Goal Release

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Categories

Questions about Diff Analyze

What does Diff Analyze do?

Analyze the differences between the current branch and origin/main, and summarize the current work progress. Diff Analyze is an agent skill from dyoshikawa/rulesync.

When should I use Diff Analyze?

Diff Analyze fits situations like: development work in your project.

How do I install Diff Analyze in Claude Code?

Run `npx skills add dyoshikawa/rulesync --skill diff-analyze -a claude-code`. Or copy the skill folder (.rulesync/skills/diff-analyze in dyoshikawa/rulesync) into .claude/skills/diff-analyze in your project. Claude Code loads it when a task matches its description.

How do I install Diff Analyze in Codex?

Run `npx skills add dyoshikawa/rulesync --skill diff-analyze -a codex`. Or copy the skill folder (.rulesync/skills/diff-analyze in dyoshikawa/rulesync) into .agents/skills/diff-analyze in your project. Codex loads it when a task matches its description.

Can I use Diff Analyze 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 dyoshikawa/rulesync --skill diff-analyze -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/diff-analyze, .gemini/skills/diff-analyze, .github/skills/diff-analyze and .opencode/skills/diff-analyze in your project.

What does Diff Analyze need to run?

Going by SKILL.md and its folder, Diff Analyze needs the command-line tools its instructions call (git).

Does Diff Analyze access the network?

SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Diff Analyze 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 Diff Analyze use?

Diff Analyze 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 Diff Analyze use?

About 245 tokens (SKILL.md is roughly 980 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 Diff Analyze?

Skills that share tags, products or a category with Diff Analyze: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 296k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Diff Analyze?

dyoshikawa (a GitHub user) maintains it in dyoshikawa/rulesync, which has 1,507 GitHub stars. The repository holds 40 skills in this directory. The repository was last updated on October 8, 2026.

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