Workflow SDK: Adding Durability and Reliability to TypeScript Functions
By
tilt
7mo ago· 20 min readen
100/100
Golden Brown
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Summary
The article introduces Workflow SDK, a tool that adds durability, reliability, and observability to asynchronous JavaScript/TypeScript functions. It enables developers to build applications and AI agents that can suspend, resume, and maintain state easily. The SDK moves developers from manually implementing queues and custom retry logic to using durable, resumable code with simple directives like "use workflow". The article demonstrates how to create durable functions that can handle failures gracefully and maintain state across interruptions.
Key quotes
· 4 pulleduse workflow brings durability, reliability, and observability to async JavaScript
Build apps and AI Agents that can suspend, resume, and maintain state with ease
Move from hand-rolled queues and custom retries to durable, resumable code with simple directives
export async function welcome(userId: string) { "use workflow";
"use workflow" brings durability, reliability, and observability to async JavaScript. Build apps and AI Agents that can suspend, resume, and maintain state with ease.

