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Use when implementing data validation for API payloads, form inputs, or database writes. Triggers for: Pydantic models, Zod schemas, input sanitization, type validation, field constraints, or request/response schemas. NOT for: business logic (use domain services) or authentication/authorization.
Passed 17 of 23 test cases with the skill, and 9 of 23 without it.
and 12 more in the full report
8 fixed9 passed either way6 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.
I am building a TypeScript validation module using Zod for student registration. What property key casing should be used for object schema fields, and what exact name should be given to the exported schema constant for student creation?
| Checked | Without skill | With skill |
|---|---|---|
| Uses snake_case casing for object schema property keys | Missed | Passed |
| Names the exported schema variable studentCreateSchema | Missed | Passed |
The instructions your model reads when the skill loads.
Expert data validation for Python backends (Pydantic) and TypeScript frontends (Zod) with type-safe validation pipelines.
| Layer | Tool | Purpose |
|---|---|---|
| Backend | Pydantic v2 | Request/response validation |
| Frontend | Zod | Form validation, schema inference |
| Sanitization | bleach, strip-html | Input cleaning |
| Types | mypy, TypeScript | Compile-time safety |
backend/
├── app/
│ ├── schemas/
│ │ ├── __init__.py
│ │ ├── student.py # StudentCreate, StudentUpdate, StudentOut
│ │ ├── fee.py # FeeCreate, FeeOut
│ │ └── common.py # PaginationParams, ErrorDetail
│ └── models/ # SQLModel (separate from schemas)
frontend/
├── lib/
│ ├── schemas/
│ │ ├── student.schema.ts
│ │ └── index.ts # Export all schemas
│ └── validation.ts # Shared validation utilities
└── types/
└── shared.ts # Inferred types from Zod
# backend/app/schemas/student.py
test cases passed, vs 9 / 23 without
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