CapabilitiesIdle and waking
Wakes on a request
A paused machine starts again by itself when a web request or message arrives.
Short answer: 10 of 16 providers offer it fully: Agent 37, Blaxel, E2B, Morph, Runtime, Sandboxer, Sprites, Tensorlake, Vercel Sandbox and boxd. With a catch: Cloudflare Sandbox and InstaBox. Checked 29 October 2026.
Who offers it
Part of Idle timers, waking and session limits, which explains why it matters.
Fully: Agent 37, Blaxel, boxd, E2B, Morph, Runtime, Sandboxer, Sprites, Tensorlake and Vercel Sandbox. With a catch: Cloudflare Sandbox and InstaBox. Not at all: Boat, Daytona, Lizard and Modal.
- Agent 37Yes
A signed URL or any request to any of its URLs brings a sleeping instance back.
docs-confirmed “opening one is exactly the kind of request that wakes the instance.” Source
- BlaxelYes
Reconnecting to the sandbox brings it back from standby.
docs-confirmed “Reconnecting to the sandbox transitions it back to active mode.” Source
- boxdYes
The first inbound packet wakes it, though bot protection can answer webhooks with a 503 instead.
docs-confirmed “`boxd machine list` shows hibernated machines with `status: hibernated`. They wake automatically on the first inbound packet.” Source
- E2BYes
Connecting to a paused sandbox resumes it.
docs-confirmed “Set `autoResume` to have a paused sandbox wake up on the next SDK call or HTTP request to one of its URLs.” Source
- MorphYes
A request brings a sleeping devbox back with its memory.
docs-confirmed “Devboxes can branch to hundreds of parallel replicas or scale to zero after a period of inactivity, preserving all application and memory state.” Source
- RuntimeYes
The call waits while the sandbox wakes, then runs.
docs-confirmed “A paused sandbox wakes by itself when a request needs it.” Source
- SandboxerYes
A sandbox paused for being idle resumes by itself on the next use.
docs-confirmed “**Wake on use.** A sandbox paused for being idle resumes by itself” Source
- SpritesYes
A request to its URL brings it back.
docs-confirmed “The next request resumes it in 100–500ms” Source
- TensorlakeYes
Automatic resume can be switched off per sandbox.
docs-confirmed “Setting it to `true` allows the next proxied request to wake a suspended sandbox” Source
The call that arrives starts a new session and then retries.
docs-confirmed “If a persistent sandbox is stopped and you call `runCommand`, `writeFiles`, or other SDK methods on it, the SDK automatically starts a new session and retries the operation.” Source
- Cloudflare SandboxWith a catch
The catch: A request starts a fresh machine, not the one that stopped; files come back only from a snapshot your code saved.
docs-confirmed “Cloudflare does not wake the Durable Object when its instance stops.” Source
- InstaBoxWith a catch
The catch: Only a machine the platform paused for being idle wakes on a request; one you paused yourself has to be resumed.
docs-confirmed “Idle auto-pause wakes on use (exec, SSH, public URL, `instabox wake`). A pause or stop you requested does not: call resume or start.” Source
- BoatNo
A stopped machine no longer exists, so a web request cannot bring it back; you have to resume it.
inferred “There is no pause. A stop removes the virtual machine and keeps a copy of the disk.” Source
- DaytonaNo
A paused or stopped sandbox has to be started; a request to its preview URL does not start it.
inferred “Paused | The VM sandbox is paused with filesystem and memory state preserved. State is offloaded to nearby storage.” Source
- LizardNo
Connecting or opening a URL does not resume a paused or stopped sandbox.
docs-confirmed “`connect` attaches to an existing sandbox without changing its state, so it does not resume a paused or stopped sandbox.” Source
- ModalNo
A finished sandbox cannot be woken; the next request needs a new sandbox or a snapshot.
docs-confirmed “Once finished, no further commands can be executed inside the Sandbox.” Source
Related
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