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This Week in Effect - 141
Cluster idempotency in Module of the Week. A big push on EventLog and a native McpClient land in Effect v4. Effect Miami 🌴 speakers announced.
Effect 4.1 (Release)
New Effect release featuring the effect/crypto modules, Glob module, streaming CSV, HttpApi Problem Details, Decision.locate, and more!
Module of the Week - Cluster, Part 4
We look at idempotency and the dual-write problem, then use idempotency keys and transactions to safely handle messages that arrive more than once.
This Week in Effect - 140
Cluster delivery in Module of the Week. Effect surpasses 50 million downloads per week. 🚀 Effect Miami scheduled for Nov 9.
Module of the Week - Cluster, Part 3
We look at at-most-once and at-least-once delivery, then use persisted messages to stop Dad losing messages when a runner crashes.
Module of the Week - Cluster, Part 2
We write our first entity, then follow one of its messages across a cluster to see how runners agree on who owns what.
This Week in Effect - 138
Effect v4 is officially stable, merged live at the San Francisco meetup. 🚀 Exploring Effect Cluster in the Module of the Week series.
Effect v4 RC: September 2026 Updates
The final month of the RC cycle. A major runtime performance pass, systematic correctness sweeps, and the stable release of Effect 4.0.