npm install -g zod-contract-mock-forge-mcp

{
  "mcpServers": {
    "zod-forge": {
      "command": "zod-contract-mock-forge-mcp"
    }
  }
}

claude mcp add zod-forge zod-contract-mock-forge-mcp

My schema file is src/schemas/user.ts, exported as UserSchema.
My OpenAPI spec is docs/openapi.yaml.

1. introspect_schema — what are the constraints on this schema?
2. generate_mock_variants — give me 10 diverse valid payloads (seed: 42) for CI reproducibility
3. generate_exhaustive_union_violations — test every branch of the role discriminated union
4. detect_schema_drift — has the Zod schema diverged from the OpenAPI docs?
5. evaluate_schema_evolution — does my schema change break any existing mock data?

{
  "schema_id": "schema_a1b2c3d4",
  "count": 3,
  "all_valid": true,
  "variants": [
    { "name": "Colleen Rowe", "age": 37 },
    { "name": "Pat Reynolds", "age": 24 },
    { "name": "Veronica Konopelski", "age": 45 }
  ]
}

{
  "drift_count": 2,
  "drifts": [
    {
      "field_path": "role",
      "drift_type": "missing_in_openapi",
      "zod_value": "string",
      "openapi_value": null
    },
    {
      "field_path": "email",
      "drift_type": "missing_in_zod",
      "zod_value": null,
      "openapi_value": "string"
    }
  ]
}

{
  "breaking_change": true,
  "sample_count": 20,
  "invalid_mock_count": 20,
  "failure_reasons": [
    {
      "field_path": "status",
      "zod_code": "invalid_type",
      "expected": "string",
      "received": "undefined",
      "affected_mock_count": 20
    }
  ]
}

npm run build        # compile TypeScript → dist/
npm run lint         # ESLint
npm run format       # Prettier --write
npm run format:check # Prettier check (used in CI)
npm test             # Vitest