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Preserve inherited context in prediction forks - #53678
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## Why Prediction forks need to retain their parent's context even when it exceeds the automatic compaction threshold. Compaction or context resets can otherwise replace the history used for the prediction. ## What changed - Apply a thread-local `AutoCompactionDisabled` policy to experimental prediction forks without changing model or skill budgets. - Skip automatic compaction before, during, and after turns, including context-limit recovery, and suppress new token-budget reminders. - Reject `new_context` requests for these threads and report context-limit failures without compacting their history. ## Testing Add regression tests for legacy and paginated prediction forks across compaction thresholds, unchanged parent compaction and skill/tool inputs, context-limit failures, and rejected context resets. Add a request-history snapshot verifying inherited context and reminders survive without compaction or additional reminders after a tool call. GitOrigin-RevId: 7df374287f4142f776981bb6c22e5caa564d74a5
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Preserve inherited context in prediction forks
Why
Prediction forks need to retain their parent's context even when it exceeds the automatic compaction threshold. Compaction or context resets can otherwise replace the history used for the prediction.
What changed
AutoCompactionDisabledpolicy to experimental prediction forks without changing model or skill budgets.new_contextrequests for these threads and report context-limit failures without compacting their history.Testing
Add regression tests for legacy and paginated prediction forks across compaction thresholds, unchanged parent compaction and skill/tool inputs, context-limit failures, and rejected context resets. Add a request-history snapshot verifying inherited context and reminders survive without compaction or additional reminders after a tool call.