The HTTP route handler that executes step functions. It receives step execution requests from the queue, routes them to the appropriate step function, and reports results back to the workflow run.

Unlike workflowEntrypoint(), this is the handler itself rather than a factory — step bundles register their step functions globally, and the handler routes by step name.

Framework adapters mount this for you at /.well-known/workflow/v1/step — you only need it when wiring workflow support into a custom server environment.

import { stepEntrypoint } from "workflow/runtime";

// Mount on your server, e.g. a fetch-style route:
export const POST = stepEntrypoint; 

const stepEntrypoint: (req: Request) => Promise<Response>;

A fetch-style request handler.