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Rivet Weekly Changelog 2026-05

The primitive for
software that thinks.

Rivet Actors are a serverless primitive for stateful workloads.

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Give this to your coding agent
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Each Rivet Actor has built-in:

And could be a:

An Actor is just a function. Import it like a library, write your logic, and these capabilities come built in — making Actors natively suited for agent memory, background jobs, game lobbies, and more.

Rivet Actor

/ AI Agent
User
Actor
AI Agent
In-memory state
KV & SQLite
Scheduling
LLM

How Actors work.

Define state, write a run loop, broadcast events.

01/04

Define the Actor

An Actor is an independent process with its own isolated state. Create one per user, per agent, or per session.

actor({
});
02/04

Declare State

State is automatically persisted and loaded into memory when the Actor wakes. No database queries. No ORM. Just an object.

state: { messages: [], history: [] },
03/04

Process Messages

The run loop executes continuously. Wait for messages from a queue, process them with your logic. The Actor stays alive as long as it needs to.

run: async (c) => {
while (true) {
const message = await c.queue.next("message");
const response = await ai(message);
c.state.history.push({ message, response });
04/04

Broadcast in Real-time

Push updates to all connected clients instantly. WebSockets and SSE are built in — no Socket.io, no pub/sub layer, just one line.

c.broadcast("response", response);
}
},

Runs where you do.

Rivet Actors integrate with your existing infrastructure, frameworks, runtimes, and tools.

Infrastructure

VercelRailwayCloudflareKubernetesAWSGCPHetznerVMCustom Platform

Frameworks

ReactNext.jsSvelteHonoExpressElysiatRPC

Runtimes

Node.jsBunDenoCloudflare Workers

Tools

VitestPinoAI SDKOpenAPIAsyncAPITypeDoc
Rivet Inspector Dashboard

Built-In Observability

Powerful debugging and monitoring tools that work seamlessly from local development to production at scale.

Visit The Inspector

Live State Inspection

View and edit your actor state in real-time as messages are sent and processed

Network Inspector

Monitor active connections with state and parameters for each client

Event Monitoring

See all events happening in your actor in real-time and track every state change and action as it happens

REPL

Debug your actor in real-time by calling actions, subscribing to events, and interacting directly with your code

Start local. Scale to millions.

Three options, same API. Pick what works for you.

Self-Host

Single Rust binary or Docker container. Works with Postgres, file system, or FoundationDB. Full dashboard included.

$docker run -p 6420:6420 rivetkit/engine
View Self-Hosting Docs
Rivet

Rivet Cloud

Fully managed. Global edge network. Connects to your existing cloud — Vercel, Railway, AWS, wherever you already deploy.

  • Global Edge Network
  • Scales Seamlessly
  • Connects To Your Cloud
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Open Source

Apache 2.0. Audit the code, contribute features, run it however you want.

$git clone https://github.com/rivet-gg/rivet
$cd rivet && cargo run -p rivet-engine
View on GitHub

Infrastructure for software that thinks.

The next generation of software needs a new kind of backend. This is it.

Start BuildingTalk to an Engineer