From marsai-default
Four-phase debugging framework - root cause investigation, pattern analysis, hypothesis testing, implementation. Ensures understanding before attempting fixes.
npx claudepluginhub v4-company/marsai --plugin marsai-defaultThis skill uses the workspace's default tool permissions.
**Core principle:** NO FIXES WITHOUT ROOT CAUSE INVESTIGATION FIRST.
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Core principle: NO FIXES WITHOUT ROOT CAUSE INVESTIGATION FIRST.
Use for ANY technical issue: test failures, bugs, unexpected behavior, performance problems, build failures, integration issues.
Especially when:
Complete each phase before proceeding to the next.
MUST complete ALL before Phase 2 (copy to TodoWrite):
□ Error message copied verbatim | □ Reproduction confirmed | □ Recent changes reviewed (git diff) | □ Evidence from ALL components | □ Data flow traced (origin → error)
git diff, recent commits, new dependencies, config changes.Phase 1 Summary: Error: [exact] | Reproduces: [steps] | Recent changes: [commits] | Component evidence: [each] | Data origin: [source]
H#1: [what] → [result] | H#2: [what] → [result] | H#3: [what] → [STOP if fails]
If 3 hypotheses fail: STOP immediately → "3 hypotheses failed, architecture review required" → Discuss with partner before more attempts.Fix root cause, not symptom:
Debugging time boxes:
STOP and return to Phase 1 if thinking:
User signals you're wrong:
When you see these: STOP. Return to Phase 1.
| Phase | Key Activities | Success Criteria |
|---|---|---|
| 1. Root Cause | Read errors, reproduce, check changes, gather evidence, trace data flow | Understand WHAT and WHY |
| 2. Pattern | Find working examples, compare differences, understand dependencies | Identify what's different |
| 3. Hypothesis | Form theory, test minimally, verify one at a time | Confirmed or new hypothesis |
| 4. Implementation | Create test, fix root cause, verify | Bug resolved, tests pass |
Circuit breakers:
Required sub-skills:
Complementary:
STOP and report if:
| Decision Type | Blocker Condition | Required Action |
|---|---|---|
| Cannot reproduce issue | Bug is intermittent and no consistent reproduction steps | STOP and gather more data before proceeding |
| 3 hypotheses failed | Three consecutive hypotheses tested and all failed | STOP and escalate for architecture review |
| 3 fixes failed | Three fix attempts made but issue persists | STOP and question fundamental assumptions |
| 30 minutes without root cause | Extended investigation without identifying root cause | STOP and escalate for help |
| Fix reveals new problem | Each attempted fix creates different symptoms | STOP and request architecture review |
The following requirements CANNOT be waived:
| Severity | Condition | Required Action |
|---|---|---|
| CRITICAL | Production system affected | MUST prioritize and escalate immediately |
| CRITICAL | Data corruption or loss risk | MUST stop other work and focus exclusively |
| HIGH | User-facing functionality broken | MUST investigate before other tasks |
| HIGH | Tests failing on main branch | MUST resolve before merging new code |
| MEDIUM | Non-critical feature affected | Should investigate within current session |
| LOW | Minor behavior deviation | Fix in next iteration if time permits |
| Rationalization | Why It's WRONG | Required Action |
|---|---|---|
| "Quick fix for now, investigate later" | Later never comes. Quick fixes mask root causes. | MUST complete Phase 1 before any code change |
| "Just try changing X and see" | Guessing wastes time and introduces new bugs | MUST form hypothesis with evidence first |
| "I'm confident this is the issue" | Confidence without evidence is guessing | MUST verify with reproduction steps |
| "One more fix attempt" (after 2+) | Pattern indicates architecture issue, not bug | STOP and escalate for architecture review |
| "Each fix reveals new problem" | Symptom of deeper structural issue | STOP: architecture review REQUIRED |
| "I don't fully understand but this might work" | Partial understanding = partial fix = new bugs | MUST understand root cause before fixing |
| "Skip the test, I'll manually verify" | Manual verification is unreliable and non-repeatable | MUST create failing test (Phase 4, Step 1) |
| "Previous run showed it works" | Stale evidence is not evidence | MUST re-verify with fresh execution |
| User Says | Your Response |
|---|---|
| "Just fix it quickly, we don't have time" | "MUST follow the phases - skipping investigation causes more delays through repeated fixes" |
| "Try this change, I think it'll work" | "I'll add that as a hypothesis and test it properly in Phase 3" |
| "We've tried 5 fixes, try one more" | "CANNOT proceed - 3+ failed fixes requires architecture review before more attempts" |
| "Skip the investigation, the cause is obvious" | "MUST verify the obvious before acting - obvious causes are often wrong" |
This skill uses these universal patterns:
skills/shared-patterns/state-tracking.mdskills/shared-patterns/failure-recovery.mdskills/shared-patterns/exit-criteria.mdskills/shared-patterns/todowrite-integration.mdApply ALL patterns when using this skill.