Guides Effect TypeScript development with typed errors, services, layers, and testing patterns.
npx skills add https://github.com/PunGrumpy/og-tester --skill effect-ts-pungrumpy
Please help me install this Agent Skill. Skill: effect-ts Source: https://github.com/PunGrumpy/og-tester/tree/main/.agents/skills/effect-ts Command: npx skills add https://github.com/PunGrumpy/og-tester --skill effect-ts-pungrumpy
effect@beta and @effect/* package versions matched to the target runtime (Node, Browser, Bun, Vitest). - Use Case: When adding a new service to an Effect-based project, the Skill ensures you define it with Context.Service, build it with Layer.effect, handle failures with Schema.TaggedErrorClass, and provide layers only at the application boundary. ## Quick Start Ask the assistant to implement a new Effect service with typed error handling and layer-based dependency injection following this repository's Effect conventions.High-intent search queries and answers about installing and using this skill.
Define services with Context.Service using class syntax, then build implementations with Layer.succeed for pure values or Layer.effect for effectful construction with dependencies. Compose layers with Layer.mergeAll, Layer.provide, or Layer.provideMerge, and provide them only at the application boundary.
Prefer Schema.TaggedErrorClass for schema-backed errors and Data.TaggedError for non-serializable domain errors. Recover with Effect.catchTag or Effect.catchTags, and keep failures, defects, and interrupts distinct using Cause inspection only when needed.
Use Effect.fn for reusable effectful operations, including functions with no arguments, and Effect.gen for inline workflow orchestration with multiple yield steps. Avoid Effect.fnUntraced except for measured low-level hot paths.
Install effect@beta as the core library, then add the matching @effect/platform-node, @effect/platform-browser, or @effect/platform-bun for your runtime. Keep all @effect/* packages on aligned versions and add @effect/vitest or @effect/opentelemetry only when needed.
Avoid Effect.provide deep inside business functions because it hides wiring, complicates testing, and fragments the application graph. Compose layers once and provide them at the entrypoint, or use ManagedRuntime when a framework has multiple entry points.
eyenalxaiInstalls the Effect TypeScript library and configures agent instructions for Effect development.
zacharyr0thImplement Bun server-side applications using Bun.serve, Bun.file, and FFI.
thejordanleopoldCollect logs, metrics, and traces with OpenTelemetry for service observability.
ojowwalker77Refactor TypeScript codebases to adopt Effect-TS patterns for typed errors and Layers.