Investigate

Systematic debugging skill that enforces the Iron Law: never fix without a confirmed root cause. Produces a structured debug report with full evidence chain, minimal fix, and regression test.

Iron Law Principle

No fix without confirmed root cause. Every investigation follows a strict evidence chain:

1. Reproduce the bug with concrete evidence
2. Analyze patterns to assess scope
3. Form and test hypotheses (max 3 strikes)
4. Implement minimal fix ONLY after root cause is confirmed
5. Verify fix and generate structured report

Violation of the Iron Law (skipping to Phase 4 without Phase 3 confirmation) is prohibited.

Key Design Principles

1. Evidence-First: Collect before theorizing. Logs, stack traces, and reproduction steps are mandatory inputs.
2. Minimal Fix: Change only what is necessary. Refactoring is not debugging.