TL;DR
Workflow SDK enables TypeScript developers to write durable, long-running workflows as ordinary code without managing separate infrastructure or worker fleets.
Key Points
- Replaces Temporal's signals/queries/updates with single 'hook' primitive for simpler human-in-the-loop workflows
- Compiler automatically splits code into workflow and step bundles; no explicit DAG files required
- Supports pluggable backends: Postgres, Cassandra, Turso, Durable Objects, SQS, Vercel Queues via swappable 'World' interface
- Workflow v5 beta delivers 5x performance improvement; in-flight runs pinned to deployment version to eliminate versioning conflicts
Why It Matters
Eliminates the operational burden of running Temporal (Kubernetes, Cassandra, mutual TLS, worker management) while maintaining durable execution guarantees. Developers can add durability to existing codebases with just 'use step' directive, making long-running, fault-tolerant logic as natural as ordinary async/await code.
Source: vercel.com