Make js_repl image output controllable#13331
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## Summary
Add original-resolution support for `view_image` behind the
under-development `view_image_original_resolution` feature flag.
When the flag is enabled and the target model is `gpt-5.3-codex` or
newer, `view_image` now preserves original PNG/JPEG/WebP bytes and sends
`detail: "original"` to the Responses API instead of using the legacy
resize/compress path.
## What changed
- Added `view_image_original_resolution` as an under-development feature
flag.
- Added `ImageDetail` to the protocol models and support for serializing
`detail: "original"` on tool-returned images.
- Added `PromptImageMode::Original` to `codex-utils-image`.
- Preserves original PNG/JPEG/WebP bytes.
- Keeps legacy behavior for the resize path.
- Updated `view_image` to:
- use the shared `local_image_content_items_with_label_number(...)`
helper in both code paths
- select original-resolution mode only when:
- the feature flag is enabled, and
- the model slug parses as `gpt-5.3-codex` or newer
- Kept local user image attachments on the existing resize path; this
change is specific to `view_image`.
- Updated history/image accounting so only `detail: "original"` images
use the docs-based GPT-5 image cost calculation; legacy images still use
the old fixed estimate.
- Added JS REPL guidance, gated on the same feature flag, to prefer JPEG
at 85% quality unless lossless is required, while still allowing other
formats when explicitly requested.
- Updated tests and helper code that construct
`FunctionCallOutputContentItem::InputImage` to carry the new `detail`
field.
## Behavior
### Feature off
- `view_image` keeps the existing resize/re-encode behavior.
- History estimation keeps the existing fixed-cost heuristic.
### Feature on + `gpt-5.3-codex+`
- `view_image` sends original-resolution images with `detail:
"original"`.
- PNG/JPEG/WebP source bytes are preserved when possible.
- History estimation uses the GPT-5 docs-based image-cost calculation
for those `detail: "original"` images.
#### [git stack](https://github.com/magus/git-stack-cli)
- 👉 `1` #13050
- ⏳ `2` #13331
- ⏳ `3` #13049
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git-stack-id: fjord/original_image_res---4hxjh7uv9pkj_8 git-stack-title: Make js_repl image output controllable
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Summary
Instead of always adding inner function call outputs to the model context, let js code decide which ones to return.
codex.tool(...)into the outerjs_replfunction output.codex.tool(...)return values unchanged as structured JS objects.codex.emitImage(...)as the explicit path for attaching an image to the outerjs_replfunction output.input_imageitem, an explicit{ bytes, mimeType }object, or a raw tool response object containing exactly one image.view_imageoriginal-resolution behavior when JS emits the rawview_imagetool result.ViewImageToolCallevent forjs_repl-sourcedview_imagecalls so nested inspection stays side-effect free until JS explicitly emits.js_repldocs and generated project instructions with both recommended patterns:await codex.emitImage(codex.tool("view_image", { path }))await codex.emitImage({ bytes: await page.screenshot({ type: "jpeg", quality: 85 }), mimeType: "image/jpeg" })git stack
1Add under-development original-resolution view_image support #130502Make js_repl image output controllable #133313Enforce the Responses API 50 MB image limit #13049