Agent skill
schema-patterns
Effect Schema conventions and patterns. Triggers on Schema class creation, tagged unions, enums, type guards, or test fixtures using Effect Schema.
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Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/effect-schema-patterns
SKILL.md
Effect Schema Patterns
Class Instantiation
ALWAYS use Schema.make() for creating instances:
typescript
// ✅ GOOD - Use Schema.make()
const user = Schema.make(User)({ name: 'Alice', age: 30 })
// ❌ BAD - Manual construction
const user = { _tag: 'User', name: 'Alice', age: 30 }
Type Guards
ALWAYS use Schema.is() or static .is method:
typescript
// ✅ GOOD
if (Standard.is(value)) { ... }
if (Schema.is(Standard)(value)) { ... }
// ❌ BAD - manual _tag check
if (value._tag === 'Standard') { ... }
Enums
ALWAYS inline enum values directly in Schema.Enums():
typescript
// ✅ GOOD - inline values, use .enums for runtime access
export const Status = Schema.Enums({
active: 'active',
inactive: 'inactive',
})
export type Status = typeof Status.Type
// Runtime: Status.enums.active
// ❌ BAD - separate const object
export const StatusValues = {
active: 'active',
inactive: 'inactive',
} as const
export const Status = Schema.Enums(StatusValues)
Key Points
- Use
Schema.make()for type-safe instantiation - Use
Schema.is()for type predicates, never manual_tagchecks - Inline enum values directly in
Schema.Enums() - Access runtime enum values via
.enumsproperty
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