social-image-creative

name	social-image-creative
description	Generate ONE on-brand still-image creative for a single Aries social post at the correct per-platform scale. Use once per content_package post whose media is an image (feed / story-image). FORCES exactly one image_generate call and returns the generated_image creative_asset plus a content_package entry stamped with its placement. Paired with /social-video-creative for video posts.

Social Image Creative

You generate one still image for one social post. This skill is the image half of Aries creative production; /social-video-creative is the video half. Run this skill once per post that needs an image — never batch, never skip.

Non-negotiable execution contract

1. You MUST call the image_generate tool exactly once for this post. Do not return your result until the image_generate call has completed (or, on success:false, recorded the failure). Returning a post with no rendered image is a failure.
2. Render at the per-platform image scale below — never reuse a video/vertical scale for a feed image.
3. Honor the brand constraints from the production brief (background mode, palette, logo rule, "must avoid" list). For a dark brand the background MUST be near-black; a light/white/studio background is a brand violation.

Per-platform image format (pick by the post's primary platform)

Platform / placement	Aspect	Pixels	Notes
Instagram feed	4:5 portrait	1080 × 1350	Aries default feed scale
Facebook feed	1:1 square	1080 × 1080	square reads on both feed + grid
Instagram / Facebook story (image)	9:16 vertical	1080 × 1920	full-bleed, keep text off the edges

If a post targets both Instagram and Facebook, render once at 4:5 (1080 × 1350) — it crops acceptably into the Facebook feed.

Workflow

1. Read the brief for this post: hook, body, CTA, brand background mode + palette, logo rule, and the post's platform(s)/placement.
2. Compose the visual prompt to the platform scale above, dark-brand-safe, palette as accents, no invented logo.
3. Call image_generate once at the chosen pixel size. Wait for it to finish.
4. Return the asset + the post copy:

{
  "content_package_entry": {
    "post_number": <N>,
    "theme": "<short theme>",
    "hook": "<hook>",
    "body": "<2-4 sentences>",
    "cta": "<CTA>",
    "hashtags": ["#tag1", "#tag2", "#tag3"],
    "platforms": ["instagram", "facebook"],
    "format": "single_image",
    "placement": "feed",
    "media_type": "image",
    "visual_prompt": "<the prompt you rendered>"
  },
  "creative_asset": {
    "assetId": "img_<N>",
    "type": "generated_image",
    "media_type": "image",
    "path": "<absolute path returned by image_generate>",
    "width": <integer px you rendered>,
    "height": <integer px you rendered>,
    "placement": <N>,
    "prompt": "<the rendered prompt>"
  }
}

placement on the content_package entry is load-bearing downstream: feed for a feed image, story for a story image. Stamp it correctly — the publisher maps the post surface from it.

Failure handling

If image_generate returns success:false, record {assetId, post_number, prompt, error} in artifacts.errors[] and continue — never silently drop the post.