| 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
- 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.
- Render at the per-platform image scale below — never reuse a video/vertical
scale for a feed image.
- 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
- Read the brief for this post: hook, body, CTA, brand background mode +
palette, logo rule, and the post's platform(s)/placement.
- Compose the visual prompt to the platform scale above, dark-brand-safe,
palette as accents, no invented logo.
- Call
image_generate once at the chosen pixel size. Wait for it to finish.
- 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>"
},
<integer px you rendered>
<integer px you rendered>
<N>
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.
