How do I install the Multi Version Behavior Comparator skill?

Run npx skillmds@latest add arabelatso/multi-version-behavior-comparator in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Multi Version Behavior Comparator safe to use?

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Which AI agents work with Multi Version Behavior Comparator?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Multi Version Behavior Comparator free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Multi Version Behavior Comparator?

ArabelaTso (@arabelatso) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Multi Version Behavior Comparator by arabelatso

Name: Multi Version Behavior Comparator
Rating: 4.2 (5 reviews)
Author: ArabelaTso

Multi Version Behavior Comparator

Compare behavior across multiple versions of programs or repositories. Use when you need to analyze how functionality changes between versions, identify regressions, compare outputs and exceptions, or validate upgrades. The skill compares execution behavior, test results, outputs, exceptions, and observable states across versions, generating detailed reports showing behavioral divergences, potential regressions, added/removed functionality, and areas requiring validation. Supports multiple programming languages and can work with test suites or execution traces.

ArabelaTso Updated Sep 10, 2026

File contents

Multi-Version Behavior Comparator

Overview

This skill compares behavior across multiple versions of programs, identifying functional changes, regressions, and behavioral divergences to guide safe upgrades and validation.

Quick Start

# Compare two versions
python scripts/compare.py v1.0/ v2.0/

# Compare multiple versions with test suite
python scripts/compare.py v1.0/ v2.0/ v3.0/ --tests tests/

# Generate detailed report
python scripts/compare.py old/ new/ --output report.json

What Gets Compared

Functionality - Added, removed, or modified features
Outputs - Return values, printed output, file changes
Exceptions - Error handling and exception types
Test Results - Pass/fail status across versions
Observable States - Side effects, state changes

Comparison Report

Generates JSON report with:

Behavioral Divergences: Where versions behave differently
Potential Regressions: Functionality that may have broken
Added Features: New functionality in newer versions
Removed Features: Functionality no longer present
Validation Areas: Code requiring manual review

Usage

python scripts/compare.py <version1> <version2> [version3...] [--tests <test_dir>] [--output <report.json>]

Tips

Run before deploying new versions
Use with existing test suites for comprehensive comparison
Review regressions carefully before upgrading
Validate high-risk areas identified in report

---name: multi-version-behavior-comparatordescription: Compare behavior across multiple versions of programs or repositories. Use when you need to analyze how functionality changes between versions, identify regressions, compare outputs and exceptions, or validate upgrades. The skill compares execution behavior, test results, outputs, exceptions, and observable states across versions, generating detailed reports showing behavioral divergences, potential regressions, added/removed functionality, and areas requiring validation. Supports multiple programming languages and can work with test suites or execution traces.---# Multi-Version Behavior Comparator## OverviewThis skill compares behavior across multiple versions of programs, identifying functional changes, regressions, and behavioral divergences to guide safe upgrades and validation.## Quick Start```bash# Compare two versionspython scripts/compare.py v1.0/ v2.0/# Compare multiple versions with test suitepython scripts/compare.py v1.0/ v2.0/ v3.0/ --tests tests/# Generate detailed reportpython scripts/compare.py old/ new/ --output report.json```## What Gets Compared1. **Functionality** - Added, removed, or modified features2. **Outputs** - Return values, printed output, file changes3. **Exceptions** - Error handling and exception types4. **Test Results** - Pass/fail status across versions5. **Observable States** - Side effects, state changes## Comparison ReportGenerates JSON report with:- **Behavioral Divergences**: Where versions behave differently- **Potential Regressions**: Functionality that may have broken- **Added Features**: New functionality in newer versions- **Removed Features**: Functionality no longer present- **Validation Areas**: Code requiring manual review## Usage```bashpython scripts/compare.py <version1> <version2> [version3...] [--tests <test_dir>] [--output <report.json>]```## Tips- Run before deploying new versions- Use with existing test suites for comprehensive comparison- Review regressions carefully before upgrading- Validate high-risk areas identified in report

Frequently asked questions