Add AgentOS daemon control plane and maintenance tooling
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.agents/skills/rivetkit-client-javascript/SKILL.md
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---
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name: "rivetkit-client-javascript"
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description: "RivetKit JavaScript client guidance. Use for browser, Node.js, or Bun clients that connect to Rivet Actors with rivetkit/client, create clients, call actions, or manage connections."
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---
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# RivetKit JavaScript Client
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Use this skill when building JavaScript clients (browser, Node.js, or Bun) that connect to Rivet Actors with `rivetkit/client`.
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## First Steps
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1. Install the client (latest: 2.3.4)
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```bash
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npm install rivetkit@2.3.4
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```
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2. Create a client with `createClient()` and call actor actions.
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## Error Handling Policy
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- Prefer fail-fast behavior by default.
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- Avoid `try/catch` unless absolutely needed.
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- If a `catch` is used, handle the error explicitly, at minimum by logging it.
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## Getting Started
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See the [backend quickstart guide](/docs/actors/quickstart/backend) for getting started.
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## Minimal Client
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## Stateless vs Stateful
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## Getting Actors
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## Connection Parameters
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Use `params` for static connection parameters. Use `getParams` when the value can change between connection attempts, such as refreshing a JWT before each `.connect()` or reconnect.
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## Subscribing to Events
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## Connection Lifecycle
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## Low-Level HTTP & WebSocket
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For actors that implement `onRequest` or `onWebSocket`, call them directly:
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```ts @nocheck
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import { createClient } from "rivetkit/client";
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const client = createClient();
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const handle = client.chatRoom.getOrCreate(["general"]);
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const response = await handle.fetch("history");
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const history = await response.json();
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const ws = await handle.webSocket("stream");
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ws.addEventListener("message", (event) => {
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console.log("message:", event.data);
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});
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ws.send("hello");
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```
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## Calling from Backend
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## Error Handling
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## Concepts
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### Keys
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Keys uniquely identify actor instances. Use compound keys (arrays) for hierarchical addressing:
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Don't build keys with string interpolation like `"org:${userId}"` when `userId` contains user data. Use arrays instead to prevent key injection attacks.
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### Environment Variables
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`createClient()` automatically reads:
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- `RIVET_ENDPOINT` (endpoint)
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- `RIVET_NAMESPACE`
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- `RIVET_TOKEN`
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- `RIVET_RUNNER`
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Defaults to `http://localhost:6420` when unset. RivetKit runs on port 6420 by default.
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### Endpoint Format
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Endpoints support URL auth syntax:
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```
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https://namespace:token@api.rivet.dev
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```
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You can also pass the endpoint without auth and provide `RIVET_NAMESPACE` and `RIVET_TOKEN` separately. For serverless deployments, use your app's `/api/rivet` URL. See [Endpoints](/docs/general/endpoints#url-auth-syntax) for details.
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## Advanced
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### Skip Ready Wait
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Requests are normally held at the gateway until the actor is ready to accept traffic. An actor is not ready while it's still starting (before `onWake` finishes) or while it's in the [sleep grace period](/docs/actors/lifecycle#shutdown-sequence) (running `onSleep`, `waitUntil`, and pending disconnects).
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Pass `skipReadyWait: true` on the [low-level HTTP and WebSocket APIs](#low-level-http--websocket) to deliver immediately and reach the actor's `onRequest` / `onWebSocket` handler in either window:
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```ts @nocheck
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import { createClient } from "rivetkit/client";
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const client = createClient();
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const handle = client.chatRoom.getOrCreate(["general"]);
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const response = await handle.fetch("/healthz", {
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skipReadyWait: true,
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});
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const ws = await handle.webSocket("probe", undefined, {
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skipReadyWait: true,
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});
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```
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Requests can still return transient lifecycle or gateway errors. Retry once the actor is available again.
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- `actor.stopping`: the actor has fully stopped, i.e. the sleep grace period has ended but it has not yet restarted.
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- `guard.actor_stopped_while_waiting`: the request reached the actor tunnel, but the actor stopped before the gateway received a response.
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- `guard.tunnel_request_aborted`: the actor tunnel aborted the request before a response started.
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- `guard.tunnel_message_timeout`: the gateway dropped the in-flight tunnel request after its tunnel message timeout.
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- `guard.tunnel_response_closed`: the actor tunnel closed before sending a response.
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- `guard.gateway_response_start_timeout`: the gateway timed out waiting for the actor response to start.
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## API Reference
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**Package:** [rivetkit](https://www.npmjs.com/package/rivetkit)
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See the [RivetKit client overview](/docs/clients).
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- [`createClient`](/typedoc/functions/rivetkit.client_mod.createClient.html) - Create a client
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- [`Client`](/typedoc/types/rivetkit.mod.Client.html) - Client type
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## Need More Than the Client?
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If you need more about Rivet Actors, registries, or server-side RivetKit, add the main skill:
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```bash
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npx skills add rivet-dev/skills
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```
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Then use the `rivetkit` skill for backend guidance.
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7
.agents/skills/rivetkit-client-javascript/index.json
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7
.agents/skills/rivetkit-client-javascript/index.json
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@@ -0,0 +1,7 @@
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{
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"name": "rivetkit-client-javascript",
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"description": "RivetKit JavaScript client guidance. Use for browser, Node.js, or Bun clients that connect to Rivet Actors with rivetkit/client, create clients, call actions, or manage connections.",
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"skill_url": "/metadata/skills/rivetkit-client-javascript/SKILL.md",
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"generated_at": "2026-07-18T12:40:07.476Z",
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"references": []
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}
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