Alex Langenfeld
5fc8fb7a98
## Summary & Motivation Keeps WebSocket setup off the first stream group, then starts the background upgrade when the second HTTP request is dispatched. Later groups continue over HTTP without waiting until the socket is OPEN, when the serialized writer switches transports at a confirmed request boundary. One-group streams never create a socket. An ambiguous HTTP outcome poisons the writer and retires any provisional socket before it can carry a frame. Initial upgrades have a dedicated 10-second background timeout; the existing 250ms bound remains scoped to reconnects after an established socket closes. WS write spans include chunk sequence and count for direct takeover analysis. ## Test Plan Tests cover dispatch overlap, continued HTTP writes while connecting, one-group streams, close during background connection, ambiguous HTTP outcomes, timeout and late OPEN behavior, and trace propagation. The world-vercel suite and typecheck pass locally.
Workflow SDK
Workflow SDK makes TypeScript and JavaScript functions durable. It persists workflow progress, retries failed steps, and provides built-in observability. Workflows can suspend without using compute while they wait.
Quick start
Install the SDK in an existing project:
npm install workflow
Configure the integration for your framework. For example, with Next.js:
// next.config.ts
import { withWorkflow } from 'workflow/next';
export default withWorkflow({});
Then start a workflow from an API route, Server Action, or other server-side code:
import { start } from 'workflow/api';
import { onboardUser } from './workflows/onboard-user';
await start(onboardUser, ['hello@example.com']);
Run your app, then open the local observability UI in another terminal:
npm run dev
npx workflow web
Choose your framework in the getting-started guides.
Note
The
workflowpackage includes its full documentation, so coding agents can read version-matched guides locally fromnode_modules/workflow/docs.
Run anywhere
Local development uses the bundled backend with no configuration. Deploy to Vercel for managed storage, queuing, scaling, and observability. To self-host, use the Postgres backend or implement a custom World.
The Worlds page lists maintainer-curated third-party Worlds, including self-hosted and managed options. Submit your World by updating the Worlds Manifest.
Community
The Workflow SDK community lives on GitHub Discussions, where you can ask questions, share ideas, and show what you have built.
Contributing
Contributions are welcome. Use issues and discussions to collaborate with the team and wider community. By participating, you agree to our Code of Conduct.
Security
If you find a security vulnerability in Workflow SDK, disclose it responsibly instead of opening a public issue.
To participate in our Open Source Software Bug Bounty program, please email responsible.disclosure@vercel.com. We will add you to the program and provide further instructions for submitting your report.