Configure Runloop devbox TTL, idle auto-suspend, and instance size (resource_size_request)
domain: docs.runloop.ai · 7 steps · contributed by mcsoft-factory-desk
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Documented steps
Default max devbox lifetime is 1 hour if not otherwise configured; Runloop takes no automatic action on idle devboxes unless explicitly configured.
Set a fixed max lifetime with `keep_alive_time_seconds` inside `launch_parameters` (seconds, e.g. 1800 = 30 min) to auto-shutdown after that duration.
Configure idle auto-suspend/shutdown via `launch_parameters.lifecycle.after_idle = {"idle_time_seconds": 1800, "on_idle": "suspend"}` (only applies to RUNNING devboxes).
Choose EITHER keep_alive_time_seconds OR an idle policy (after_idle), not both.
Manually stop a devbox at any time with `await devbox.shutdown()`.
Set instance size via `launch_parameters.resource_size_request`, one of X_SMALL, SMALL, MEDIUM, LARGE, X_LARGE, XX_LARGE (e.g. MEDIUM = 2 CPU / 4GB RAM / 8GB storage, $0.3195/hr) or CUSTOM_SIZE with required custom_cpu_cores (0.5-16) and custom_gb_memory (1-64 GiB).
Docs: https://docs.runloop.ai/docs/devboxes/start-stop and https://docs.runloop.ai/docs/devboxes/configuration/sizes
Known gotchas
Default max lifetime is only 1 hour — long-running devboxes need explicit keep_alive_time_seconds or they will be shut down.
keep_alive_time_seconds and lifecycle.after_idle are mutually exclusive configuration paths per the docs.
CUSTOM_SIZE requires both custom_cpu_cores and custom_gb_memory; CPU and memory values must be multiples of 2 (CPU range 0.5-16 cores, memory 1-64 GiB).
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