core: strip image detail from Responses Lite requests - #27246
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## Summary Add shared image-processing primitives needed for centralized image preparation in a follow-up PR. - Add `load_data_url_for_prompt` for decoding and preparing base64 image data URLs. - Add configurable maximum-dimension and 32px patch-budget resizing. - Enforce a 1 GiB sanity limit on both encoded and decoded data-URL representations. - Preserve original PNG, JPEG, and WebP bytes when resizing is unnecessary. - Preserve the existing GIF-to-PNG behavior. - Move image utility tests into the existing sidecar test module. ## Behavior This PR is intended to be runtime behavior-preserving. Existing production callers continue using `PromptImageMode::ResizeToFit` and `PromptImageMode::Original` with their existing semantics. The new data-URL entrypoint and configurable resize mode have no production callers in this PR; they are used by the next PR in the stack. This PR does not change user-input handling, `view_image`, history insertion, request construction, HTTP image URL forwarding, or app-server behavior. #### [git stack](https://github.com/magus/git-stack-cli) - 👉 `1` #27245 - ⏳ `2` #27247 - ⏳ `3` #27246 - ⏳ `4` #27266
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## Summary Adds complete client-side image preparation behind the default-off `resize_all_images` feature flag. When enabled, local image producers defer decoding and resizing. Images are prepared centrally before insertion into conversation history, covering user input, `view_image`, and structured tool-output images. ## Behavior - Processes base64 `data:` images in messages and function/custom tool outputs. - Leaves non-data URLs, including HTTP(S) URLs, unchanged. - Applies image-detail budgets: - `high` and omitted: 2048px maximum dimension and 2.5K 32px patches. - `original`: 6000px maximum dimension and 10K 32px patches. - `auto`: uses the same 2048px / 2.5K-patch budget as high. - `low`: unsupported and replaced with an actionable placeholder. - Preserves original image bytes when no resize or format conversion is needed. - Enforces the shared 1 GiB encoded and decoded data-URL sanity limits. - Replaces only an image that fails preparation, preserving sibling content and tool-output metadata. - Uses bounded placeholders distinguishing generic processing failures, oversized images, and unsupported `low` detail. - Prepares resumed and forked history before installing it as live history without modifying persisted rollouts. ## Flag-Off Behavior When `resize_all_images` is disabled: - Existing local user-input and `view_image` processing remains unchanged. - Existing decoding and error behavior remains unchanged. - Arbitrary tool-output images are not processed. - HTTP(S) image URLs continue to be forwarded unchanged. #### [git stack](https://github.com/magus/git-stack-cli) - ✅ `1` #27245 - 👉 `2` #27247 - ⏳ `3` #27246 - ⏳ `4` #27266
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LGTM (just one test nit)
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git-stack-id: fjord/responses_strict_mode_v2---4ixxk-hc0zkmy- git-stack-title: core: strip image detail from Responses Lite requests
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Summary
detailfields from every Responses Lite request.detailfields for non-Responses-Lite models.Motivation
Responses Lite does not support image
detailtags, so Codex must omit them whenevermodel_info.use_responses_liteis enabled. This transport requirement is independent of theresize_all_imagesfeature.Stored history retains the original detail values. This keeps request-specific formatting isolated from conversation state and preserves the information for local image preparation and non-Responses-Lite requests.
git stack
1image: add shared data URL preparation utilities #272452core: resize all history images behind a feature flag #272473core: strip image detail from Responses Lite requests #272464image: preserve metadata when resizing prompt images #27266