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Guide for writing idiomatic Effect-TS code. Use when code imports from "effect", "@effect/*", or user asks about Effect patterns, Effect APIs, Effect services, layers, streams, or functional effect systems in TypeScript.

Break a PRD into independently-grabbable GitHub issues using vertical slices (tracer bullets). Use when user wants to convert a PRD into implementation issues, create GitHub issues from a spec, or plan work as vertical slices.

Create comprehensive Product Requirements Documents (PRDs) through structured user interviews, codebase exploration, and detailed planning. Use when user wants to write a PRD, create a product spec, or plan a feature implementation.