Effect-TS Skills

A collection of AI-powered skills for Effect-TS development, compatible with skills.sh.

Installation

npx skills add mrevanzak/effect-ts-skills

Or install individual skills:

npx skills add mrevanzak/effect-ts-skills/effect-ts-fundamentals
npx skills add mrevanzak/effect-ts-skills/effect-ts-errors
npx skills add mrevanzak/effect-ts-skills/effect-ts-resources
npx skills add mrevanzak/effect-ts-skills/effect-ts-concurrency
npx skills add mrevanzak/effect-ts-skills/effect-ts-anti-patterns

Skills Overview

Skill	Description	Use When
effect-ts-fundamentals	Service pattern, Effect.gen, Layers	Starting with Effect-TS, defining services
effect-ts-errors	TaggedError, catchTag, error accumulation	Implementing error handling, validation
effect-ts-resources	acquireRelease, Scope, cleanup	Managing DB connections, file handles
effect-ts-concurrency	Fiber, Semaphore, Deferred, bounded parallelism	Parallel operations, rate limiting
effect-ts-anti-patterns	Common mistakes and fixes	Code review, debugging crashes

Skill Dependency Graph

effect-ts-fundamentals (start here)
    |
    +---> effect-ts-errors
    |
    +---> effect-ts-resources
    |
    +---> effect-ts-concurrency
              |
              v
       effect-ts-anti-patterns

Key Patterns Covered

Core Concepts

• Modern Service Pattern with Effect.Service
• Generator-based composition with Effect.gen and yield*
• Layer-based dependency injection

Error Handling

• Type-safe errors with Data.TaggedError
• Selective error handling with Effect.catchTag
• Error accumulation with { mode: 'either' }

Resource Management

• Guaranteed cleanup with Effect.acquireRelease
• Scoped resources with Effect.scoped
• LIFO cleanup order

Concurrency

• Bounded parallelism with { concurrency: n }
• Rate limiting with Semaphore
• Inter-fiber signaling with Deferred

Anti-Patterns

• Missing yield* trap
• Running effects outside boundaries
• Unbounded parallelism
• Using throw instead of Effect.fail

Source

Based on patterns from EffectPatterns.

License

MIT