# E2B Python SDK 2.63.0 adds strict option to pause()

published: 2026-11-04T18:05:26.156Z
topic: infrastructure
source: https://github.com/e2b-dev/E2B/releases/tag/%40e2b%2Fpython-sdk%402.63.0
url: https://aiagentnews.io/stories/e2b-python-sdk-2-63-0-adds-strict-option-to-pause

E2B has released version 2.63.0 of its Python SDK, adding a strict parameter to the pause() method. With strict enabled, a pause is refused while the sandbox's guest agent does not respond, and the sandbox keeps running.

The release adds a strict flag to pause(), which defaults to false. When strict is set to true, a pause call fails with a ServiceBusyError or ServiceBusyException if the guest agent does not respond, and the sandbox stays up.

Without the flag, the API's default behavior applies: the memory snapshot is taken anyway and marked. The sandbox info exposes this mark as envd_unresponsive_at_pause, and resuming such a sandbox with on_resume set to "reboot" now raises GuestUnresponsiveException.

The change is listed as a minor change in the 2.63.0 release, which was published on 04 Nov.

## Why it matters if you build agents

Agent code that pauses sandboxes can now choose to fail fast instead of snapshotting a sandbox whose guest agent is unresponsive.

Code that resumes paused sandboxes with on_resume="reboot" should handle GuestUnresponsiveException, since such resumes now raise it when the pause was marked.