Regression Root Cause Analyzer

Systematically identify the root cause of regressions in CI/CD environments by combining diff analysis, git bisect integration, test failure correlation, change impact analysis, and timeline reconstruction. This skill bridges the gap between "something broke" and "this specific change caused it because of this specific reason".

When to Use This Skill

Use this skill when you need to:

• Determine which commit or merge introduced a regression
• Analyze CI/CD pipeline failures that started after a recent deployment or merge
• Correlate multiple test failures to a single root cause change
• Perform change impact analysis to understand the blast radius of a code modification
• Reconstruct the timeline of events that led to a regression
• Distinguish between a genuine regression and a flaky test or environment issue
• Investigate performance regressions that appeared after recent changes

Trigger phrases: "find the regression", "what broke the build", "which commit caused", "regression analysis", "CI pipeline broke", "test started failing", "root cause of regression", "bisect the failure", "what change caused this"

What This Skill Does