Online RootFS growth
On growth-enabled images, Sandbox0 automatically expands the writable RootFS as free space runs low, within a configured sparse logical ceiling up to 64 TiB. Agent processes keep running. Growth is enabled in the qualified Cloud region; confirm activation for other regions. Existing images and snapshots retain their captured storage geometry. The ceiling is logical capacity, not preallocated host disk.
The reviewed Browser API sources describe managed browser sessions and transferred data, without a whole writable Linux RootFS or automatic-growth contract. More browser traffic or concurrency is different from expanding one agent computer’s retained filesystem.