image-gen-router

Image Gen Router

Claude cannot generate a raster image, but the user's ChatGPT and Google accounts can. This skill generates a raster image by driving one of two official CLIs, headless, under the account the user is already signed into: no API key, no per-image API bill, exactly as if the user typed the prompt into that tool themselves.

• GPT — the OpenAI Codex CLI (codex exec with its built-in $imagegen skill, model gpt-image-2), under the user's ChatGPT login. It counts toward the Codex plan's usage limits.
• Gemini — the Google Antigravity CLI (agy -p, headless mode, its built-in image tool), under the user's Google login. It uses the plan's Antigravity quota.

The whole point of this skill is letting the user pick the model. Everything else (subject, style, aspect, palette, mood) flows straight from the prompt into the chosen backend.

The one decision that matters: which backend

Before generating, you must know which backend to use. There are exactly two cases:

1. The user already named a backend → use it, don't ask. Honor whatever they said and skip straight to generation. Map their words like this:

• GPT, OpenAI, ChatGPT, codex, "the gpt one", DALL·E (as a model family, not the API) → gpt
• Gemini, Google, agy, Antigravity, "nano banana", "the google one" → gemini

Asking again when they've already told you is annoying and wastes a turn — the user was explicit for a reason.

2. The user did NOT name a backend → ask, with no default. Use the AskUserQuestion tool with a single question and exactly two options, presented as equals (neither marked "recommended" — the user didn't express a preference, so don't manufacture one). For example:

AskUserQuestion(questions=[{
  "question": "Which model should generate this image?",
  "header": "Image model",
  "multiSelect": false,
  "options": [
    {"label": "GPT (codex)", "description": "OpenAI image model via Codex CLI, under your ChatGPT login."},
    {"label": "Gemini (agy)", "description": "Google image model via Antigravity CLI, under your Google login."}
  ]
}])