Support ephemeral forks of paginated threads - #35251
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copyberry[bot] merged 1 commit intoJul 24, 2026
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## What changed - Allow `thread/fork` to create an ephemeral fork from paginated history when `excludeTurns: true` is set, and return an invalid-request error otherwise. - Preserve the selected history and fork preview without creating a rollout path or exposing the ephemeral thread through `thread/list`. ## Testing - Cover full-history and bounded ephemeral forks, active-turn boundaries, preview selection, model input, and thread listing behavior. GitOrigin-RevId: 4c0d9739b3310d7d0d7389bec127045ac4f55b44
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Support ephemeral forks of paginated threads
What changed
thread/forkto create an ephemeral fork from paginated history whenexcludeTurns: trueis set, and return an invalid-request error otherwise.path or exposing the ephemeral thread through
thread/list.Testing
preview selection, model input, and thread listing behavior.