Codex Image Gen

Generate a real raster image from a text prompt when the running agent has no native image generator. The mechanism is non-obvious: the headless codex exec path genuinely calls the image tool, but it never writes the PNG to disk — only the Codex desktop app has the plumbing that polls the async job and saves it. The finished image is still recoverable, because its full base64 PNG is recorded in the session rollout JSONL. Run the prompt, read the session id Codex prints, open the matching rollout, and decode the largest result string to a PNG.

Contract

Inputs:

• An image-generation request, prompt, and selected local output path

Outputs:

• Generated image file and extraction evidence