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Runtime Cloud (withruntime) provides Linux sandboxes for AI agents’ code, each a Firecracker microVM that can pause with memory kept, fork and snapshot. The following table shows what CostGraph runs on this provider.

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Connect

Run the dispatcher with provider set to runtime and these variables:
  • RUNTIME_API_KEY
For CI runners, CostGraph sets CPU and memory. To see what Runtime costs, connect the Runtime integration.

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Key and permissions

RUNTIME_API_KEY is a Runtime Cloud API key created at withruntime.com/account/keys, with “runtime keys create” (npx withruntime keys create), or POST /v1/keys. Owners, admins and developers can create keys; billing members cannot. Sent as Authorization: Bearer. Keys are configured with access (full|read), reach (agent default|account), optional sandboxes+actions limit (1-20 named sandboxes; actions get, create, stop, exec, read_file, write_file) and dailyLimitMicros. Minimum for create/exec/list/delete: access=full, reach=agent (default; the key sees only sandboxes it created, others return 404), with a daily spend limit. A sandbox/action-limited key covers only named existing sandboxes and lists no delete action, so it does not fit. A key can never do more than the person who made it. Sources: withruntime.com: teams, withruntime.com: limits, withruntime.com: api, withruntime.com: products, withruntime.com: keys.

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Limits

  • Per sandbox: up to 16 vCPU / 64 GiB RAM / 400 GiB disk with credit; 2 vCPU / 4 GiB / 10 GiB without. (source)
  • Account: 100 running sandboxes with credit (200 with auto top-up), 200 vCPU and 400 GiB across running sandboxes; 4 sandboxes / 8 vCPU without credit. (source)
  • timeoutSeconds 60-86,400 (24 h) or 0 = no limit (default); idlePauseSeconds default 300 (0 = never); onTimeout default pause. (source)
  • Regions are per account (GET /v1/limits); CPU architecture not documented. Sandboxes listed as Available (not beta). (source)