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feat: preview url idle retention - #16649
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Co-Authored-By: Warp <agent@warp.dev>
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Description
Namespace-hosted agent environments should still alive while they are serving unexpired preview URLs. To do this:
• After the agent's default idle window expires, check the run’s previews every 60 seconds. Allow idle exit when the server returns no previews or a different execution.
• Apply retention to native Oz runs, third-party harnesses, and post-failure debug windows.
• Allow idle exit if a preview request fails or exceeds five seconds, rather than retaining the environment indefinitely.
• Restrict this behavior to Namespace (only environment capable of exposing preview urls)
Preview validity is determined by the server’s filtered response, not by client-side expiration or reachability checks.
Testing
Added tests for platform eligibility, execution identity checks, preview rechecks, cancellation, immediate-exit bypasses, request failures/timeouts, and API authentication
./script/runScreenshots / Videos
Agent Mode