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SDK: Add ensureServer() for automatic server recovery

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Add ensureServer() to SandboxProvider interface to handle cases where the
sandbox-agent server stops or goes to sleep. The SDK now calls this method
after 3 consecutive health-check failures, allowing providers to restart the
server if needed. Most built-in providers (E2B, Daytona, Vercel, Modal,
ComputeSDK) implement this. Docker and Cloudflare manage server lifecycle
differently, and Local uses managed child processes.

Also update docs for quickstart, architecture, multiplayer, and session
persistence; mark persist-* packages as deprecated; and add ensureServer
implementations to all applicable providers.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
This commit is contained in:
Nathan Flurry 2026-03-15 20:14:30 -07:00
parent d008283c17
commit 35840facdd
38 changed files with 620 additions and 205 deletions
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9
docs/multiplayer.mdx
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@ -22,16 +22,13 @@ Use [actor keys](https://rivet.dev/docs/actors/keys) to map each workspace to on
import { actor, setup } from "rivetkit";
import { SandboxAgent, type SessionPersistDriver, type SessionRecord, type SessionEvent, type ListPageRequest, type ListPage, type ListEventsRequest } from "sandbox-agent";
// Inline Rivet persist driver — copy into your project.
// See https://github.com/nichochar/sandbox-agent/tree/main/examples/persist-rivet
interface ActorContextLike { state: Record<string, unknown>; }
interface RivetPersistData { sessions: Record<string, SessionRecord>; events: Record<string, SessionEvent[]>; }
type RivetPersistState = { _sandboxAgentPersist: RivetPersistData };
class RivetSessionPersistDriver implements SessionPersistDriver {
private readonly stateKey: string;
private readonly ctx: ActorContextLike;
constructor(ctx: ActorContextLike, options: { stateKey?: string } = {}) {
private readonly ctx: { state: Record<string, unknown> };
constructor(ctx: { state: Record<string, unknown> }, options: { stateKey?: string } = {}) {
this.ctx = ctx;
this.stateKey = options.stateKey ?? "_sandboxAgentPersist";
if (!this.ctx.state[this.stateKey]) {
@ -146,5 +143,5 @@ await conn.prompt({
## Notes
- Keep sandbox calls actor-only. Browser clients should not call Sandbox Agent directly.
- Inline the Rivet persist driver (shown above) so session history persists in actor state.
- Copy the Rivet persist driver from the example above into your project so session history persists in actor state.
- For client connection patterns, see [Rivet JavaScript client](https://rivet.dev/docs/clients/javascript).