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Get Started Free →Use when encountering any bug, test failure, build break, or unexpected behavior — runs a 4-phase systematic debugging process before proposing any fix. Iron Law: NO FIXES WITHOUT ROOT CAUSE INVESTIGATION FIRST. Produces a `.orchestrator/debug/` artifact the fixer agent must reference.
| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-06 | ✗→✓ | ▲ Improved | -43% | 0% |
| case-04 | ✗→✓ | ▲ Improved | -5% | 0% |
| case-05 | ✗→✓ | ▲ Improved | -61% | 0% |
| case-15 | ✗→✓ | ▲ Improved | -72% | 0% |
| case-11 | ✗→✓ | ▲ Improved | -57% | 0% |
If topology=multi-module (triage announcement or coordinator spec/plan declaration), read ../references/multi-module.md. Investigate read-only across repos; fix inside the task's registered module only; defer commits until integration passes.
tdd.3 failed hypotheses → re-read from scratch. Done = repro + regression test + root cause named + green.
Other measured skills in the registry, with their headline benchmark lift.