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effect-ts

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Use for nontrivial Effect 4 work including services/layers, typed errors, Schema/JsonSchema, Config, runtime/concurrency, @effect/vitest, effect/ai and @effect/ai-*, effect/sql and @effect/sql-*, Effect Atom (@effect/atom-*), or @prb/effect-next.

skills/effect-ts/SKILL.md

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Nov 11, 2026
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# Effect 4

Apply Effect 4 semantics from project-local architecture, the narrowest relevant reference, and source matching the
target's installed packages.

## Workflow

Do not activate this workflow merely because a file imports `effect`. For nontrivial Effect work:

1. Resolve the target package or workspace and its exact installed `effect` and relevant `@effect/*` versions. If
   `effect` is not 4.x, stop because this skill does not apply. For 3.x, point the user to the v3 skill:
   `npx skills add PaulRBerg/agent-skills#shelved --skill effect-ts-v3`.
2. Confirm lockstep versions: every `@effect/*` package must match the installed `effect` version exactly. Report a
   mismatch instead of coding around it.
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