Multi-layer validation to catch bugs before they escape
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See how to installReview the instructions the agent will receive before you install.
MULTIPLE INDEPENDENT VALIDATION LAYERS
Each layer catches what others miss
One check can fail silently. Four layers rarely do.
What: Static analysis, types, linting
Catches: Typos, syntax errors, type mismatches
Run: First, before anything else
What: Individual function/module tests
Catches: Logic errors, edge cases, regressions
Run: After each code change
What: Component interaction tests
Catches: Interface mismatches, data flow errors
Run: After unit tests pass
What: Full system tests, user scenarios
Catches: Missing requirements, workflow bugs
Run: Before claiming complete
Code Change
↓
[Layer 1: Lint/Type Check]
↓ PASS?
[Layer 2: Unit Tests]
↓ PASS?
[Layer 3: Integration Tests]
↓ PASS?
[Layer 4: E2E / Manual Check]
↓ PASS?
Done
Fail at any layer → FIX before proceeding
| Without This Layer | What Escapes |
|---|---|
| No type checks | Undefined calls crash at runtime |
| No unit tests | Logic bugs slip through |
| No integration | Components don't work together |
| No E2E | User workflows broken |
1. Make change
2. Run linter immediately
3. Run affected unit tests
4. Run integration suite
5. Test the actual feature
1. Write failing test first
2. Fix the bug
3. Run all tests (regression check)
4. Verify original symptom gone
1. Write unit tests for new logic
2. Implement feature
3. Add integration tests
4. Verify against requirements
Configure per project:
layer_1:
command: "npm run lint && npm run typecheck"
when: "On save, before commit"
layer_2:
command: "npm run test:unit"
when: "After code changes"
layer_3:
command: "npm run test:integration"
when: "After unit tests pass"
layer_4:
command: "npm run test:e2e"
when: "Before claiming done"
→ Syntax/type error in your code
→ Fix immediately, don't proceed
→ Never commit with lint errors
→ Logic error or regression
→ Check: Did you break something?
→ Check: Is your new test wrong?
→ Fix root cause, not symptoms
→ Interface/contract broken
→ Check: API changes?
→ Check: State management issues?
→ May need to update multiple files
→ User-visible problem
→ Trace back through layers
→ Ask: Which layer SHOULD have caught this?
→ Add test to that layer
pre-action-verifier → Runs before each layerassumption-checker → Validates test assumptionsscope-boundary-checker → Ensures tests cover scoperollback-planner → Ready if pipeline failsNo reviews yet. Tell others what you thought.
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