Use this skill when applying VCSDD to TypeScript/JavaScript projects. Provides fast-check property testing patterns, Stryker mutation testing, and vitest/jest integration for the VCSDD pipeline.
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See how to installReview the instructions the agent will receive before you install.
| Tier | Tool | Install | Use Case |
|---|---|---|---|
| 1 | fast-check | npm install -D fast-check | Property-based testing |
| 1 | @stryker-mutator/core | npm install -D @stryker-mutator/core | Mutation testing |
| 1 | vitest / jest | npm install -D vitest | Unit + property tests |
import * as fc from 'fast-check';
import { describe, it } from 'vitest';
import { parse, serialize } from '../src/parser';
describe('parser properties', () => {
it('never throws on arbitrary input', () => {
fc.assert(
fc.property(fc.string(), (s) => {
// Should return Ok or Err, never throw
const result = parse(s);
return result !== undefined;
})
);
});
it('roundtrip: parse(serialize(x)) === x', () => {
fc.assert(
fc.property(fc.string({ minLength: 1, maxLength: 50 }), (s) => {
const result = parse(s);
if (result.ok) {
return serialize(result.value) === s;
}
return true; // Error cases are valid
}),
{ numRuns: 1000 }
);
});
});
# Initialize Stryker
npx stryker init
# Run mutation testing
npx stryker run
# Check results in reports/mutation/
stryker.config.js:
module.exports = {
mutate: ['src/**/*.ts', '!src/**/*.test.ts'],
testRunner: 'vitest',
reporters: ['html', 'clear-text', 'progress'],
thresholds: { high: 80, low: 60, break: 50 },
};
type Result<T, E> = { ok: true; value: T } | { ok: false; error: E };
function parse(input: string): Result<ParsedDoc, ParseError> {
if (!input) return { ok: false, error: ParseError.Empty };
// ...
}
Using discriminated unions ensures the compiler enforces error handling.
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Use this skill when running or interpreting VCSDD adversarial reviews. Provides calibration guidance for the Adversary agent, finding severity classification, and anti-leniency enforcement patterns.
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Run Phase 3 (adversarial review) for the active VCSDD feature. Spawns a fresh vcsdd-adversary agent with zero Builder context to review implementation against spec. Produces binary PASS/FAIL verdict per dimension.
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Create a git commit for the current VCSDD phase. Auto-generates a conventional commit message from state.json including phase, sprint, gate verdict, and affected bead IDs. Tags with vcsdd/<feature>/phase-<id>.
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Run the strict-mode sprint contract review after Phase 2c. Spawns a fresh vcsdd-adversary instance to review `contracts/sprint-N.md` and writes a PASS/FAIL verdict under `reviews/contracts/sprint-N/output/`.
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Run Phase 6 (convergence check) for the active VCSDD feature. Validates four-dimensional convergence: finding diminishment, finding specificity, criteria coverage, and duplicate detection.
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Use this skill during Phase 6 convergence checks. Provides four-dimensional convergence analysis, hallucination detection, and duplicate finding identification.
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