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Node.js backend patterns with Express/Fastify, repositories
Passed 21 of 22 test cases with the skill, and 15 of 22 without it.
and 5 more in the full report
6 fixed15 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 6 test cases the skill fixed. Same model, same prompt, with and without the skill.
Define a TypeScript custom error class for missing database resources that produces a 404 status and a NOT_FOUND code string.
| Checked | Without skill | With skill |
|---|---|---|
| NotFoundError inherits from the base DomainError class. | Missed | Passed |
| NotFoundError status code property defaults to 404. | Passed | Passed |
The instructions your model reads when the skill loads.
project/
├── src/
│ ├── core/ # Pure business logic
│ │ ├── types.ts # Domain types
│ │ ├── errors.ts # Domain errors
│ │ └── services/ # Pure functions
│ │ ├── user.ts
│ │ └── order.ts
│ ├── infra/ # Side effects
│ │ ├── http/ # HTTP layer
│ │ │ ├── server.ts # Server setup
│ │ │ ├── routes/ # Route handlers
│ │ │ └── middleware/ # Express middleware
│ │ ├── db/ # Database
│ │ │ ├── client.ts # DB connection
│ │ │ ├── repositories/ # Data access
│ │ │ └── migrations/ # Schema migrations
│ │ └── external/ # Third-party APIs
│ ├── config/ # Configuration
│ │ └── index.ts # Env vars, validated
│ └── index.ts # Entry point
├── tests/
│ ├── unit/
│ └── integration/
├── package.json
└── CLAUDE.md
test cases passed, vs 15 / 22 without
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