Enforce Effect-first code standards as part of the agent loop
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Skill Claude CodeCodex
Write comprehensive tests using @effect/vitest for Effect code and vitest for pure functions. Use this skill when implementing tests for Effect-based applications, including services, layers, time-dependent effects, error handling, and property-based testing.
Skill Claude CodeCodex
Implement typeclasses with curried signatures and dual APIs for both data-first and data-last usage.
Skill Claude CodeCodex
Conceptual guide to wide events (canonical log lines) for observability. Use when thinking about instrumentation strategy, span annotations, or designing what context to capture.
Skill Claude CodeCodex
Build durable workflows with Effect using Workflow, Activity, DurableClock, DurableDeferred, and DurableQueue for execution that survives restarts, supports compensation (saga pattern), and integrates with Effect Cluster for distribution.
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