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## Why Add a standalone image generation path that can be exercised independently of hosted Responses image generation, while retaining the hosted tool as fallback unless the extension is actually available to the model. ## What changed - Added the `codex-image-generation-extension` crate with standalone generate/edit execution, prior-image selection for edits, model-visible image output, and local generated-image persistence. - Installed the extension in app-server behind the disabled-by-default `imagegenext` feature and backend eligibility checks. - Updated core tool planning so eligible `image_gen.imagegen` exposure replaces hosted `image_generation`, while unavailable configurations retain hosted fallback. - Added coverage for extension behavior, edit history reuse, feature gating, auth eligibility, and hosted-tool replacement. - The extension is installed through app-server only in this PR; other execution paths retain hosted image generation because hosted replacement occurs only when the standalone executor is actually registered and model-visible. - The initial extension contract intentionally fixes the image model to `gpt-image-2` and uses automatic image parameters. - Native generated-image history/card parity and rollout persistence cleanup are intentionally deferred follow-up work. ## Validation - `just test -p codex-image-generation-extension` - `just test -p codex-features` - `just test -p codex-core hosted_tools_follow_provider_auth_model_and_config_gates` - `just test -p codex-app-server` - `just fix -p codex-image-generation-extension -p codex-features -p codex-core -p codex-app-server` - `just fmt` - `just bazel-lock-update` - `just bazel-lock-check` --------- Co-authored-by: jif-oai <jif@openai.com>