Effect

Use current Effect v4 APIs and the production defaults in this skill. Established project conventions still take precedence unless the task is explicitly changing them.

Source Rule

Reviewed against Effect 4.0.0, upstream commit 6389d9ac6. Read references/V4_APIS.md when upgrading from v3 or a v4 prerelease. The installed version takes precedence: prerelease APIs and import paths can differ.

Check these before guessing:

• the nearest AGENTS.md and any project-local Effect practices doc
• the project-pinned effect package source and version
• current upstream Effect source when the installed package does not answer the question

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