Bug Localization

Systematically pinpoint the exact location of bugs in a codebase using a combination of stack trace analysis, error log correlation, code flow tracing, spectrum-based fault localization, and bisection techniques. This skill transforms vague symptoms into precise file-and-line identification.

When to Use This Skill

Use this skill when you need to:

• Determine which file, class, or function contains a bug based on an error report
• Analyze stack traces to find the true origin of an exception (not just where it surfaced)
• Correlate multiple log entries to identify the point where behavior diverges from expectations
• Apply statistical fault localization techniques (Tarantula, Ochiai) to test suite results
• Use git bisect or delta debugging to narrow down the commit or change that introduced a defect
• Trace data flow through a system to find where values become incorrect
• Identify the root cause when an error manifests far from its origin

Trigger phrases: "find the bug", "localize the fault", "where is the bug", "trace the error", "analyze stack trace", "narrow down the issue", "which commit broke", "bisect the failure", "fault localization"

What This Skill Does