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Unit 42

Workflow SDK Documentation

Patterns for Defining Tools Human-in-the-Loop Building Durable AI Agents Queueing User Messages Resumable Streams Sleep, Suspense, and Scheduling Streaming Updates from Tools API Reference Workflow Globals Changelog Resilient run start Cookbook Building a World Deploying Astro Express Fastify Hono Getting Started NestJS Next.js Nitro Nuxt Python SvelteKit Vite corrupted-event-log fetch-in-workflow hook-conflict Errors
FatalError
2026-05-31 · via Workflow SDK Documentation

Throw to mark a step as permanently failed without retrying.

When a FatalError is thrown in a step, it indicates that the workflow should not retry a step, marking it as failure.

You should use this when you don't want a specific step to retry.

import { FatalError } from "workflow"

async function fallibleWorkflow() {
    "use workflow"
    await fallibleStep();
}

async function fallibleStep() {
    "use step"
    throw new FatalError("Fallible!") 
}

API Signature

Parameters

NameTypeDescription
messagestring The error message.

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