/social-thumbnail

name: Social Thumbnail Workflow
description: >-
  Optional thumbnail planning for short-video platforms and social feeds.
  Use when the user asks for creative help with a "video thumbnail", "短视频封面",
  "竖版海报", "TikTok cover", "Reels cover", "YouTube Shorts thumbnail",
  "social media poster" — anything optimized for 9:16 mobile feed scrolling with
  prominent headline space. Produces high-contrast, headline-friendly cover art
  in 9:16 by default. NOT for: full posters meant for print, photorealistic
  portraits without text overlay intent, horizontal banners — use other skills.
version: 0.1.0

Social Thumbnail Workflow

Generate cover art for short-video platforms (TikTok / Reels / Shorts) or vertical social feeds. Optimized for 9:16, high contrast, big-headline space, and 1-second feed legibility.

Optional assistant scope

Use this planning workflow only when the caller asks for creative development. A supplied storyboard, prompt set or approved count/budget can call tools directly. Preserve explicit tool/model/provider, prompt, ratio, references and quality choices. Do not impose a new concept-selection or approval step on resolved inputs. Discovery is available to any workflow; delegation is optional. Return handles/results to the caller, which owns previews, downloads and presentation. Visual descriptions require actual inspection.

Choosing a dedicated Skill

For an unresolved marketing, event or campaign poster with designed text, call `generate_marketing_poster` directly. Use `brand` for the subject, `content` for supplied copy (`autoCopy: false` when exact wording matters), and `extraNotes` for verified details and layout constraints. Put style/design directions in `extraNotes` or `customStyle`; they are not words to print verbatim in the poster. A poster needs only a subject; images are optional. Do not force a generic image-generation agent or prompt-enhancement step. Preserve an upstream workflow's explicit tool/model/provider selection; a resolved generic illustration or image-only cover can still use `generate_image`.

Use `list_skills` for live styles, output specifications and purchased-credit prices. Choose `styleId` by its ID, not the displayed label; omit `styleId` and `customStyle` for Auto. Nonempty `customStyle` overrides the preset. `styleImage` supplies the primary visual style, with written style only as a compatible supplement; never copy its products, claims or wording. `logo` is an exact identity reference and `productImages` identify the subjects. Use actual accessible files or image URLs only. These dedicated tools require a MeiGen key and purchased credits; OpenAI-compatible/ComfyUI providers do not run them.

Resolve only missing required information or scope. A supplied count, copy, quality and approved budget do not need another confirmation. Save a UUID `requestId` and exact inputs for each logical poster, then use `check_skill` with `skill: "brand-poster"` and the original ID after interruption. Follow `nextAction`; do not create paid replacements automatically.

When to trigger

• User says "video thumbnail", "封面", "短视频封面", "Reels cover", "TikTok cover"
• User asks for creative help planning a vertical thumbnail or poster
• User describes content meant for mobile feeds and asks for visual

Design constraints (apply to every prompt)

1. **Default ratio** — use `aspectRatio: "9:16"` with `generate_image`, or `ratio: "9:16"` with `generate_marketing_poster`, for an unspecified vertical cover; preserve an explicit caller ratio. Do NOT write `--ar 9:16` in the prompt. 2. **High contrast** — bold foreground subject against a strong color-block or gradient background. Tiny details get lost when scaled to a phone-feed thumbnail. 3. **Headline placement** — for an image-only cover or a caller-requested later text overlay, reserve a clear zone for that overlay. For a dedicated marketing poster, supply the visible headline in `content` and any placement direction in `extraNotes`; let the poster workflow lay out the text instead of forcing a blank title area. 4. **One focal point** — feed thumbnails work when the eye lands in <1 second. Don't pack multiple subjects. 5. **Brand-safe color** — when the user gives a brand color, pin it; otherwise default to high-saturation primary palettes (red / cobalt / orange / electric green) over muted tones.

Workflow

1. Clarify intent

Ask only when essential headline or theme information is missing:

• "What's the headline text the cover needs to support?" (lets you reserve the right zone)
• OR if user already gave a clear theme: skip ask, plan directly.

2. Reference (optional but recommended)

Call `search_gallery(category="Poster Design")` for style reference; 146 curated entries are available. Show 3-5 thumbnails to the user if they want to pick a direction.

3. Plan the requested count; offer directions only when unresolved

Distinct directions, not minor tweaks. For each, write a prompt that:

• Names the focal subject (1 person / 1 object / 1 typographic motif)
• Specifies background (color block / gradient / minimal scene)
• Specifies lighting / mood
• For image-only covers with a later overlay, calls out the headline-safe zone; for dedicated posters, supplies the actual headline and layout directions in their respective fields
• Includes contrast keyword ("high contrast", "bold colors")

4. Resolve remaining choices

Proceed when count, inputs and budget are already authorized. Ask only if a required choice remains unresolved.

5. Generate

Call the tools directly or delegate when useful. Preserve caller parameters and schedule within authorized scope.

6. Deliver

Return task handles, completed URLs and saved paths when available. The caller owns presentation. Inspect before describing visual details; do not add new paid variants automatically.

Prompt template

For image-only cover art when the caller will add the headline later; do not apply this blank-heading templat