Effect Ts

Teaches Claude how to work with Effect-TS, the typed functional programming library that brings structured concurrency, dependency injection, and error channels to TypeScript. Covers the full stack: Schema validation, Layer composition, fiber-based concurrency primitives, Stream processing, and the Effect.gen generator syntax that makes it all readable. The paradigm guide is the smart part here,it explicitly tackles the mental model shift from Promises and includes refactoring recipes and anti-patterns. Most useful when you're either migrating a codebase to Effect or building services that need typed errors and testable dependencies. Not for React's useEffect or Redux side effects, despite the name collision.

skills.sh installs: 257
GitHub stars: 222
last updated: Aug 21, 2026

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Install

$ npx -y skills add pproenca/dot-skills --skill effect-ts --agent claude-code

Installs into .claude/skills of the current project.

Files

Effect TypeScript Best Practices

Effect is a TypeScript library for building complex, type-safe applications with structured error handling, dependency injection via services/layers, fiber-based concurrency, and resource safety.

When to Apply

Writing or reviewing TypeScript code that imports from effect, @effect/schema, or @effect/platform
Implementing typed error handling with Effect<Success, Error, Requirements>
Building services and layers for dependency injection
Working with Schema for data validation, decoding, and transformation
Using fiber-based concurrency (queues, semaphores, PubSub, deferred)
Processing data with Stream and Sink
Migrating from Promises, fp-ts, neverthrow, or ZIO to Effect