Diff Summary

Q: What is a Claude Code skill and how does the Diff Summary skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Diff Summary is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Security · Sub-category: security-misc · Last updated: 2026-05-21

lang:python

One-call structured triage of a git diff. Returns per-file role classification (source/test/config/doc/generated/build/fixture/migration), risk tier (low/medium/high) with reasons, public-API touch detection, co-changed-test detection, secret-risk path flagging, and aggregate stats. Replaces the 5-20 Read calls an agent burns reading each modified file individually to figure out "what kind of change is this and how risky is it". Stateless, no network, stdlib Python only.

About this skill (catalog notes)

Diff Summary includes pricing or quota commentary; at least one code block. The SKILL.md is on the shorter side at about 595 words.

Original author: meghal86
Indexed lastmod: 2026-05-21
Catalog position: Security · security-misc
Indexed related skills: 10

How Diff Summary fits the catalog

Diff Summary sits in the Security category under the security-misc sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

Structured triage of a git diff. One call replaces the per-file Read sweep an agent normally does to figure out which files in a diff are tests, which touch the public API, which are migrations, which need careful review.

What this skill does

Diff Summary is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/diff-summary/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Diff Summary Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 119,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/diff-summary
curl -L https://claudskills.com/skills/diff-summary/SKILL.md \
  -o ~/.claude/skills/diff-summary/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/diff-summary/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/diff-summary/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\diff-summary\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Diff Summary Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/diff-summary/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Diff Summary skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Diff Summary skill?

Use Diff Summary when your Claude Code task falls under the Security category — specifically in the security misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Diff Summary" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Diff Summary skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Diff Summary is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/meghal86/stacksignal/blob/HEAD/.agents/skills/diff-summary/SKILL.md
Author: meghal86

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

meghal86. (2026). Diff Summary [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/diff-summary/

BibTeX

@misc{diff-summary-2026,
  author    = {meghal86},
  title     = {Diff Summary [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/diff-summary/}
}

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Browse all Security skills → Top 100 skills

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