sandboxes

Change a sandbox's vCPUs, memory or disk by restarting it, keeping its whole disk. Running programs stop.

Works on a running sandbox (stopped first if persistent, paused first otherwise), a paused one, or a stopped one. It keeps the whole disk (every file, installed package and setting), volumes, environment, labels, name, previews and ports. Every running program stops: a running sandbox is stopped first, and a paused one's saved memory is discarded, so it starts fresh from its disk. It stays on its server: no_capacity means that server has no room for the new size now, and nothing changed. A disk only grows (disk_shrink otherwise), and its filesystem fills the new size at the restart. Charged as a wake or a restart, at the new size and the same rates. Send Prefer: wait=N (seconds, at most 120) to get the answer once the sandbox has settled; the SDKs do.

post/v1/sandboxes/{id}:resize

Request

  • Base URL: https://api.withruntime.com
  • URL: https://api.withruntime.com/v1/sandboxes/{id}:resize
  • Auth: HTTP bearer

Path parameters

idstring required

Resource identifier (UUID).

Headers

Idempotency-Keystring

Replaying the same key with the same request within 24 hours returns the first result and never repeats the effect. A refusal is not kept: a request refused before it ran (no_capacity, busy, a limit) runs afresh when sent again with its key. The SDKs send one automatically; the server makes one when absent and returns it in the idempotency-key response header.

Request body

vcpuinteger

The new number of vCPUs, 1 to 16 (without credit at most 2). Omit to keep it.

memoryMiBinteger

The new memory in MiB, 128 to 65536 (without credit at most 4096). Omit to keep it.

diskMiBinteger

The new disk in MiB: only larger than it is, at most 409600 (without credit at most 10240). Its filesystem grows to fill it at the restart; a disk never shrinks. Omit to keep it.

restarttrue

Optional, and only true, which older clients send: a resize always restarts the sandbox. It keeps the whole disk (every file, installed package and setting), volumes, environment, labels, name, previews and ports. Every running program stops: a running sandbox is stopped first, and a paused one's saved memory is discarded, so it starts fresh from its disk.

Response

Success

idstring required

Resource identifier (UUID).

kind'sandbox' required
namestring nullable
labelsobject

Your own key/value tags, at most 32. Filter lists with label=key:value.

status'pending' | 'active' | 'paused' | 'stopping' | 'stopped' required

Deprecated: read state. An older, coarser name for it, kept for older clients.

state'starting' | 'running' | 'pausing' | 'paused' | 'resuming' | 'stopping' | 'stopped' required
regionstring required
funding'trial' | 'paid' required
vcpuinteger
memoryMiBinteger
diskMiBinteger
cpu'shared' | 'reserved'
cpuFloorMillisinteger
pausableboolean
timeoutSecondsinteger

Its time limit in seconds, up to 86400 (24 hours); 0 is none: it runs while it works and pauses when idle.

onTimeout'pause' | 'stop' | 'delete'

What happens when its time limit, credit or a spending limit ends it. The same value as onLeaseEnd, its older name.

idlePauseSecondsinteger

Pauses after this many idle seconds; 0 is never.

idlePauseUnusedOnlyboolean

True only for a sandbox created before 27 September 2026 with the old default idle pause, which paused it only while nothing had used it. False when the idle time counts from the last activity.

autoWakeboolean

A request wakes it when paused: an exec, a file or terminal call, or a visit to a shared port.

persistentboolean

It has no time limit and is not paused for being idle unless idlePauseSeconds says so.

diskKeptboolean

Stopped with its disk kept: :restart starts it again from the disk. A stop keeps the disk; only a delete removes it.

lastActiveAtstring date-time nullable

The last exec, file, terminal, desktop or preview request, or open preview connection, to within five seconds (a minute for a sandbox whose idle time counts only while unused).

createdAtstring date-time required
readyAtstring date-time nullable

When its current run became ready to run commands. Null before that, while it is paused, and once a stop that kept its disk has ended the run; endedAt says when it ended.

expiresAtstring date-time required

Paid up to, at most an hour ahead, or when a stopped sandbox ended: kept for older clients. Read endsAt for when it stops or pauses by itself.

endsAtstring date-time nullable

When it stops or pauses by itself: the end of its time limit, which :extend moves, or where its funding ends when credit or a spending limit stops its renewal. null when it never will: no time limit, or not running.

endedAtstring date-time nullable
stopReasonstring nullable

Why it stopped or paused. Yours: requested, time_limit (its timeoutSeconds ran out and it was made to stop rather than pause; lease_expired before 4 October 2026), idle, paused_expired (kept paused past its retention), insufficient_funds (credit ran out), pilot_hours_used (its pilot's sandbox hours are used; credit does not run it, and the account's owner may write to support to extend the pilot or ask for more hours), pilot_ended (its pilot and the pilot's grace are over; credit does not run it, and the account's owner may write to support to extend the pilot), lifetime_cap (this sandbox's own maxTotalCostMicros), spending_limit (an owner-set spending limit, usually this agent's daily limit; see what is left with GET /v1/limits or runtime limits) or authority_revoked (the key that made it lost the right). A fault on our side, not in your code: host_lost (its machine failed; create a new sandbox) and pause_failed (its memory could not be kept; it is paused with its files, and the next wake starts it from its disk, memoryRestored false). operator_stopped: our operator stopped it. startup_failed: it stopped before it was ready to run commands; from your own image, check its start and ready commands. account_busy_here: it can start only on the servers that hold its snapshot or image, and your own sandboxes there were short of CPU, so it did not start and nothing ran; start it again in a minute. service_unready: a service on our side that it needs was unavailable, so it could not keep running; create a new one. host_stopped: its machine ended without a stop being asked for; while it was starting or waking that is our fault, and once it was running it can also be a shutdown or crash inside the sandbox.

pausedAtstring nullable
pausedExpiresAtstring nullable

When a paused or stopped sandbox is deleted. Null while it is kept as long as your account has credit.

memoryRestoredboolean
placementstring nullable

Opaque tag of the server it is on: the same for your sandboxes and snapshots on one server, different on another, never the server's name. Compare tags to see whether two share a server; keep them apart with spreadFrom on create. Null before it is placed.

chargedMicrosinteger

Settled, in microdollars (1,000,000 = $1).

heldMicrosinteger

Deprecated, kept for older clients: read chargedMicros and GET /v1/usage.

ratesobject
envNamesstring[]

The names of its own environment variables (env), sorted, on a create, an update and a read of one sandbox. Values are never shown.

secretsstring[] nullable

The egress secrets it may use, fixed when it was created: only those of your secrets that would otherwise reach it. null: every secret that reaches it. On a create, an update and a read of one sandbox.

secretsEnforcedboolean

On an update with labels by a key that may read secrets, when one of your egress secrets is scoped: true when every server running your sandboxes holds the change, so the next request from this sandbox is rewritten (or no longer is) by the new labels. False when a server has not confirmed yet; it takes the change within 15 seconds. Absent for any other key: its change reaches the servers within 15 seconds.

simulatedboolean
replayedboolean

Present and true when an Idempotency-Key replay answered.

Changes

No recorded changes to this operation across all 1 revision of this API.