Durable Objects now support pending I/O operations without connected client

Durable Objects remain active while handling a request from a connected client. This change applies when no client is connected, such as when an agent continues a submitted job after its client disconnects.

This behavior is the default for Workers with a compatibility date of 2026-10-01 or later. To use it with an earlier date, add the durable_object_io_tasks_prevent_eviction compatibility flag. To opt out, add the durable_object_io_tasks_do_not_prevent_eviction flag.

Pending service binding requests now keep Durable Objects running while they wait for a response. Pending calls to another Durable Object through remote procedure call (RPC) or fetch(), as well as this.ctx.container.monitor(), now also keep the Durable Object running.

Promises passed to this.ctx.waitUntil() and pending setTimeout() and setInterval() timers also receive this protection.

Previously, Cloudflare could shut down an idle Durable Object while one of these operations remained pending without a connected client. This could stop unfinished work.

This change helps you run long-running tasks such as agents. An agent can call tools through service bindings, coordinate with other Durable Objects, or wait for a container process without relying on the original client to remain connected.

Outbound fetch() requests to external services, TCP sockets, and outbound WebSockets already keep Durable Objects running.

Each pending operation prevents idle shutdown for up to 15 minutes. Starting another one later can extend the Durable Object's time in memory. The limit applies to each operation, not to the total time in memory.

Duration charges continue while an operation prevents eviction.

For more information, refer to Lifecycle of a Durable Object.