behavior-preservation-checker

What problem does it solve?

This Skill automatically detects and reports behavioral differences between two versions of a codebase, ensuring that code migrations, refactorings, or updates do not introduce regressions or alter intended functionality.

Core Features & Use Cases

• Automated Comparison: Compares test results, execution traces, and observable outputs between original and migrated codebases.
• Regression Detection: Identifies tests that fail in the new version but passed in the old, or vice-versa.
• Actionable Guidance: Provides specific recommendations for fixing detected behavioral deviations.
• Use Case: After migrating a critical service from Python 2 to Python 3, use this Skill to confirm that all existing tests still pass and that the application's runtime behavior remains identical, preventing unexpected production issues.

Quick Start

Use the behavior-preservation-checker skill to compare the code in '/path/to/original/repo' with the code in '/path/to/migrated/repo' and save the report to 'comparison_report.json'.