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compare-patches

Analyze two code patches for semantic equivalence using structure and tests.

5|Updated Mar 4, 2026
Search Tags:#testing#verification#comparison#diff#code#patch
One-click install
npx skills add https://github.com/nicholls-inc/claude-code-marketplace --skill compare-patches
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: compare-patches
Source: https://github.com/nicholls-inc/claude-code-marketplace/tree/main/crosscheck/skills/compare-patches
Command: npx skills add https://github.com/nicholls-inc/claude-code-marketplace --skill compare-patches

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill helps users determine whether two code patches are semantically equivalent by analyzing their structure and relevant tests, eliminating the need for code execution.

Core Features & Use Cases

  • Semantic Patch Comparison: Analyzes two code diffs to assess if they produce identical outcomes across the test suite.
  • Test Outcome Analysis: Examines test behaviors and traces execution paths to identify differences or confirm equivalence.
  • Use Case: A developer wants to verify whether two different implementations of a function behave identically under existing tests, ensuring correctness before deployment.

Quick Start

Use the compare-patches skill by providing two code diffs to analyze their equivalence based on relevant tests and code structure.

Frequently Asked Questions about compare-patches

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I verify code patch equivalence without executing the code?▼

You can verify code patch equivalence by analyzing the code structure, test results, and execution paths. This approach determines semantic equivalence without execution, ensuring correctness for refactoring validation and version comparison tasks.

What is semantic patch comparison and how does it work?▼

Semantic patch comparison analyzes two code diffs to assess if they produce identical outcomes across the test suite. It examines test behaviors and traces execution paths to identify differences or confirm equivalence without running the code.

Can I compare two different function implementations to see if they behave identically under existing tests?▼

Yes, you can compare two different function implementations to verify identical behavior under existing tests. The analysis inspects code context and potential edge cases to ensure correctness before deployment.

What's the best way to validate refactored code diffs against the original version?▼

The best way to validate refactored code diffs is to analyze their semantic equivalence by inspecting code structure and relevant tests. This ensures the refactored version produces identical outcomes without requiring code execution.

Do I need to run my test suite to check if two code diffs produce the same results?▼

No, you do not need to run your test suite. The analysis examines test behaviors and traces execution paths statically, identifying differences or confirming equivalence across the test suite without actual execution.

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