Effect 4 code that follows your project's patterns.
Guides changes to Effect 4 code using project conventions, installed-package evidence, and scoped verification.
When to use it
Use for nontrivial Effect 4 work, not merely because a file imports effect.
It changes how the agent develops Effect 4 code by requiring local conventions, verified APIs, minimal changes, and scoped tests.
What you provide
Requires installed current stable Effect 4 packages; every installed @effect/* package must match the effect version exactly. Stop on other major versions or report version mismatches.
This skill
Effect-TS/effect
Fetches Effect source from GitHub
~/.cache/effect-ts/effect
Maintains a local Effect source cache