effect-review-v4
Effect v4 Code Review
Orchestrate a multi-agent review against Effect v4 ("effect-smol", the
effect@4.0.0-beta.* line) best practices.
Effect v4 is a structural rewrite. Services, errors, Cause, and Schema all
changed shape. This skill checks that v4 code follows v4 conventions — it
does not hunt for leftover v3 APIs. If the codebase is on Effect v3, use the
effect-review skill instead.
This skill has burned its hand before. Past runs produced "fixes" that were
reverted after breaking production (the optional → optionalKey mass-flip was
reverted twice), flagged idioms that were deliberate workarounds for real
compiler/runtime constraints, and recommended APIs that do not exist in the v4
beta. The process below exists to prevent a recurrence: gather repo conventions
first, label the risk of every fix, and adversarially verify findings before
reporting them. Follow it.