Stats
Actions
Tags
From effect
Effect Schema conventions and patterns. Triggers on Schema class creation, tagged unions, enums, type guards, or test fixtures using Effect Schema.
How this skill is triggered — by the user, by Claude, or both
Slash command
/effect:skills/schema-patternsThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
__ALWAYS use `Schema.make()` for creating instances:__
ALWAYS use Schema.make() for creating instances:
// ✅ GOOD - Use Schema.make()
const user = Schema.make(User)({ name: 'Alice', age: 30 })
// ❌ BAD - Manual construction
const user = { _tag: 'User', name: 'Alice', age: 30 }
ALWAYS use Schema.is() or static .is method:
// ✅ GOOD
if (Standard.is(value)) { ... }
if (Schema.is(Standard)(value)) { ... }
// ❌ BAD - manual _tag check
if (value._tag === 'Standard') { ... }
ALWAYS inline enum values directly in Schema.Enums():
// ✅ 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)
Schema.make() for type-safe instantiationSchema.is() for type predicates, never manual _tag checksSchema.Enums().enums propertynpx claudepluginhub jasonkuhrt/claude-marketplace --plugin effectDefines @effect/schema for type-safe data validation, parsing, encoding, transformations including primitives, literals, structs, arrays, tuples in Effect TypeScript apps.
Defines runtime-validated TypeScript schemas using z.object, primitives, enums, literals, and schema composition. Useful for validating API responses, form submissions, and environment variables.
Enforces Effect-TS patterns for services with Effect.Service, errors via Schema.TaggedError, layer composition, and effect-atom React components. Use for type-safe Effect codebases.