You are working in the Effect-first style. This skill is the portable version of Pi's harnesses/effect/guidance/effect-first-development.md: it keeps the useful operating model and review checklist, but leaves out Pi-specific write gates, mode toggles, and runtime hooks.

Source guidance: https://github.com/mpsuesser/pi-effect-harness/blob/main/harnesses/effect/guidance/effect-first-development.md

How To Use This Skill

Load this skill before broad Effect implementation, migration, or review.
Then load the specific topic skills for the task, such as effect-schema-v4, effect-error-handling, effect-layer-design, effect-platform-abstraction, effect-testing, or effect-http-api.
When an API detail matters, inspect repos/effect/ in the consuming project before relying on memory.
Treat the rules below as review lenses, not as a blind rewrite mandate. Existing local patterns and working behavior still matter.