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Record reasoning effort changes in conversation history behind a flag - #43110
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…#43110) ## What changed Add the disabled-by-default `reasoning_effort_override` feature for OpenAI models with `use_responses_lite` enabled. Append a trusted `configuration_update` after accepted input when no effort is established in surviving history or the resolved effort changes. Preserve the existing history prefix and continue sending the request-level reasoning effort. Share effort normalization through `ModelInfo::resolve_reasoning_effort` so requests and history updates resolve `ultra` consistently and translate `persistent` to `disabled`. Exclude other custom effort values from history updates, and compare only against harness-authored configuration items. ## Testing Add integration coverage for effort transitions, deduplication, history prefix and cache-key preservation, alias normalization, and feature/provider/model gating. Add unit coverage for model-specific `ultra` resolution, fallbacks, and `persistent` translation. GitOrigin-RevId: c3fe7050058076454d8ea20054a618bca9d48c7c
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Record reasoning effort changes in conversation history behind a flag
What changed
Add the disabled-by-default
reasoning_effort_overridefeature for OpenAI models withuse_responses_liteenabled. Append a trustedconfiguration_updateafter accepted input when no effort is established in surviving history or the resolved effort changes. Preserve the existing history prefix and continue sending the request-level reasoning effort.Share effort normalization through
ModelInfo::resolve_reasoning_effortso requests and history updates resolveultraconsistently and translatepersistenttodisabled. Exclude other custom effort values from history updates, and compare only against harness-authored configuration items.Testing
Add integration coverage for effort transitions, deduplication, history prefix and cache-key preservation, alias normalization, and feature/provider/model gating. Add unit coverage for model-specific
ultraresolution, fallbacks, andpersistenttranslation.