version: "1.0.0"

Validation Error Handling

Follow ../_shared/skill-contract.md.

Purpose

Define how invalid input is rejected and how errors are reported.

Use when

• request validation matters
• failure responses must be predictable

Do not use when

• the task is purely transport wiring

Inputs required

• invalid cases
• field-level constraints
• response style

Outputs expected

• validation rules
• error response shape
• client-facing message strategy

Workflow

1. List invalid cases.
2. Choose field versus form-level errors.
3. Define response payload.
4. Define message safety.
5. Verify examples.

Validation checklist

• [ ] Invalid cases are listed
• [ ] Error response shape is stable
• [ ] Messages do not expose sensitive detail

References

• ../../prompts/review_security.md
• ../../examples/profile-update-contract.md