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Diff Summary (Grade B)Security-tested data-ai skill for Claude AI. Grade B. One-call structured triage of a git diff. Returns per-file role classification (source/test/config/doc/generated/build/fixture/migration), risk ti

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Daniel NikulshynReviewed by Daniel Nikulshyn·Updated July 2026

Overview

Diff Summary is a security-tested data-ai skill for Claude AI that performs one-call structured triage of a git diff. It returns per-file role classification, risk tier with reasons, public-API touch detection, co-changed-test detection, secret-risk path flagging, and aggregate stats. This tool is designed to replace the multiple Read calls an agent would normally make to figure out the type of change and its risk level. It's stateless, doesn't require a network connection, and is implemented in stdlib Python. The tool can be used to answer questions like "what changed in this branch", "triage this PR", "summarize the diff", "is this PR safe to merge", and "what's risky about this change". It's particularly useful for pre-commit or pre-PR sanity checks and code-review preparation. Diff Summary provides a structural picture of the changes, answering most "what kind of PR is this" questions without requiring the content of individual files to be read. It's recommended to use Diff Summary before reading individual modified files, as it provides a high-level overview that can help prioritize which files need a closer look. The tool can be invoked with various options to customize its behavior, such as specifying a base branch, filtering files by risk level, or including raw unified diffs per file. Overall, Diff Summary aims to streamline the process of understanding and triaging changes in a git repository.

Key features

  • Per-file role classification
  • Risk tier with reasons
  • Public-API touch detection
  • Co-changed-test detection
  • Secret-risk path flagging
  • Aggregate stats

Pricing

Model
Free
Category
Skills
Rating
No reviews yet

Use cases

Triage a PR

Use Diff Summary to quickly understand the changes in a PR and identify potential risks

Pre-commit sanity check

Run Diff Summary before committing changes to ensure they meet certain criteria

Code-review preparation

Use Diff Summary to prioritize which files need a closer look during code review

Pros & Cons

Pros

  • Reduces the number of Read calls needed to understand changes
  • Provides a high-level overview of changes
  • Helps prioritize which files need closer inspection
  • Stateless and doesn't require a network connection
  • Implemented in stdlib Python

Cons

  • May require additional processing for very large diffs
  • Output format may need to be adjusted for specific use cases

Reviews

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Q&A

Are there any potential drawbacks to using Diff Summary?

Yes, Diff Summary may require additional processing for very large diffs and its output format may need to be adjusted for specific use cases.

Asked by Lindiwe Mahlangu · Jun 30, 2026

What are the key benefits of using Diff Summary?

Diff Summary reduces the number of Read calls needed to understand changes, provides a high-level overview of changes, and helps prioritize which files need closer inspection.

Asked by Frank Müller · Apr 18, 2026

Is Diff Summary dependent on network connections?

No, Diff Summary is stateless and doesn't require a network connection.

Asked by Mohammed Al-Amin · Apr 8, 2026

What does Diff Summary do?

Diff Summary performs one-call structured triage of a git diff, returning per-file role classification and risk tier with reasons.

Asked by Kenji Watanabe · Apr 5, 2026

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