workflow-devkit

Development

Build durable, resumable TypeScript workflows with Vercel Workflow DevKit. Use when creating long-running processes, AI agents, background jobs, multi-step pipelines, webhooks, or event-driven systems. Triggers on "workflow", "durable", "resumable", "use workflow", "use step".

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Workflow DevKit

Build reliable, long-running processes with automatic retries, state persistence, and observability.

Quick Reference

Pattern	Use Case	Key API
Workflows	Orchestrate durable operations	`"use workflow"` directive
Steps	Atomic, retriable units	`"use step"` directive
Webhooks	Human-in-the-loop, callbacks	`createWebhook()`
Actors	Event-driven state machines	`defineHook()` + `for await`
Streaming	Real-time frontend updates	`getWritable()` / `run.readable`
AI Agents	Durable LLM workflows	`DurableAgent` + `globalThis.fetch = fetch`
AI Gateway	Multi-provider model switching	`"provider/model"` strings, `@ai-sdk/gateway`

Prerequisites

pnpm add workflow @workflow/ai ai @ai-sdk/gateway zod

Core Concepts

Workflows (`"use workflow"`)

import { sleep } from "workflow";

export async function myWorkflow(input: string) {
  "use workflow";
  const result = await step1(input);
  await sleep("5s");
  return result;
}

Steps (`"use step"`) - MUST be in SAME FILE as workflow

async function step1(input: string) {
  "use step";
  return await fetch(`/api/data?q=${input}`).then(r => r.json());
}

Error Types

import { FatalError, RetryableError } from "workflow";

// Auto-retried
throw new Error("Transient failure");

// No retry - stops workflow
throw new FatalError("Invalid credentials");

// Custom retry timing
throw new RetryableError("Rate limited", { retryAfter: "60s" });

Detailed Documentation

patterns.md - Workflow patterns (sequential, parallel, routing, actors)
api-reference.md - Complete API reference
ai-integration.md - AI SDK and DurableAgent patterns

Imports Cheat Sheet

// Core workflow
import {
  sleep, fetch, FatalError, RetryableError,
  createWebhook, createHook, defineHook,
  getWritable, getWorkflowMetadata, getStepMetadata,
} from "workflow";

// API routes
import { start, getRun } from "workflow/api";

// AI integration
import { DurableAgent } from "@workflow/ai/agent";
import { generateText, generateObject } from "ai";
import { createUIMessageStreamResponse } from "ai";

Examples Directory

Reference implementations: ~/dev/workflow-examples/

Example	Pattern
`nextjs/`	Basic user signup workflow
`kitchen-sink/`	All patterns reference
`actors/`	Event-driven actor pattern
`ai-sdk-workflow-patterns/`	AI agent patterns
`flight-booking-app/`	DurableAgent with tools
`rag-agent/`	RAG with PostgreSQL + embeddings
`birthday-card-generator/`	Webhooks + scheduling