Your engineers get durability. The token saving is whatever your metered trace says it is.
Historical tests cover Claude Code and aider. Compatibility depends on the client version and operation; other agents require their own test evidence.
Historical Apple Silicon agent-session tests measured 13.7–25.2 seconds. Sub-second resume remains planned. Provider compatibility is specific to the tested provider and protocol; these measurements are not a recovery-time guarantee.
Billed at most once, gateway-enforced: proven for Claude Code. For aider the gateway held the response 4 of 4 times and the client returned 3 of 4. Reported, not promised.
Per-session token budgets are enforced by the gateway; exceeding one checkpoints and parks. Fan-out budget pools have no gate yet, so that sentence is product behavior, not proof.
Fleet view of parked agents, waking on schedule or on webhook: planned. The hosted service runs today; this fleet view is not built yet.