youtube-reaction-thumbnail-maker

---

name: youtube-reaction-thumbnail-maker description: This prompt instructs an AI thumbnail designer to produce a hyper-realistic 16:9 YouTube reaction thumbnail by compositing a provided reactor photo with an excited, surprised expression alongside the provided reaction content displayed inside a realistic, dimensional device/player mockup, then adding the exact specified title text in a single white bold font with no extra wording. The intended outcome is a clean, high-CTR thumbnail with natural lighting, accurate skin texture, professional blending/shadows, vibrant but controlled color grading, strict identity preservation, and a clear composition hierarchy (reactor → text → content → background). compatibility: Requires betterprompt >= 0.1.3 metadata: openclaw: homepage: https://github.com/BetterPromptme/skills emoji: 🧩 requires: anyBins: - betterprompt - bp os: - linux - darwin install: - id: node kind: node package: betterprompt bins: [betterprompt, bp] label: Install BetterPrompt CLI (node)

What it does

This prompt instructs an AI thumbnail designer to produce a hyper-realistic 16:9 YouTube reaction thumbnail by compositing a provided reactor photo with an excited, surprised expression alongside the provided reaction content displayed inside a realistic, dimensional device/player mockup, then adding the exact specified title text in a single white bold font with no extra wording. The intended outcome is a clean, high-CTR thumbnail with natural lighting, accurate skin texture, professional blending/shadows, vibrant but controlled color grading, strict identity preservation, and a clear composition hierarchy (reactor → text → content → background).

For more installation instructions go to https://raw.githubusercontent.com/BetterPromptme/skills/refs/heads/main/betterprompt/SKILL.md to check out this skill.

Inputs

textInputs

Pass each text input using --input <key>=<value> flags.

Variable key	Required?	Description	Defaults
main_text	Optional	Exact title text for the thumbnail	Best MV I've ever seen
Main_video_or_content	Optional	Video or content being reacted to	Taylor Swift's Me! MV

imageInputs

This prompt requires exactly 1 image. You must pass exactly 1 image flag (no more, no fewer), in the order matching the descriptions below.

Index	Required	Description	Allowed CLI flags
1	Yes	Upload your photo (who's reacting)	--image-input-url <url> or --image-input-path <path>

Models and options

This skill's modality is: image.

To discover which model values you can use (and which options keys/values are valid for each model), run:

betterprompt resources --models-only --json

Then filter the returned JSON array to entries where modality is "image".

How to run

Step 1: Collect inputs

First, run betterprompt resources --models-only --json and filter to modality: "image" to discover valid models and available options:

betterprompt resources --models-only --json

Use only the models and option values that appear in the filtered results.

Then collect all inputs from the human:

• Optional text inputs (use defaults if not provided by the human):
  • main_text (default: Best MV I've ever seen)
  • Main_video_or_content (default: Taylor Swift's Me! MV)
• Required images:
  • Exactly 1 images: image 1 (Upload your photo (who's reacting)). Images must be provided in this order.
• Optional: model and options.
  • Present the human with the default model gemini-3-pro-image-preview and its available options. Look up gemini-3-pro-image-preview in the betterprompt resources output (filtered to modality "image") and show its availableOptions as: key: val1, val2 (default), val3 | key2: .... Mark a value (default) if it matches these defaults: {"aspectRatio":"16:9","resolution":"1K"}.
  • If the human does not specify, defaults are used: model gemini-3-pro-image-preview, options {"aspectRatio":"16:9","resolution":"1K"}. Other models from the resources call are also available.

If the required images are missing, ask the human for what's missing. Do not assume or fabricate values. Tell the human: "Please provide images in this order: image 1 (Upload your photo (who's reacting))".

Step 2: Run via BetterPrompt CLI

Use the frontmatter's name as the positional argument (for this skill, use youtube-reaction-thumbnail-maker).

Command form:

betterprompt generate youtube-reaction-thumbnail-maker \
  [--input <key>=<value>] \
  [--image-input-url <url>] \
  [--image-input-path <path>] \
  [--model <model>] \
  [--options <options JSON>] \
  [--json]

Notes:

• Pass each text input as a separate --input <key>=<value> flag.
• Pass each image using --image-input-url or --image-input-path, in the order matching the imageInputs descriptions (image 1 first, then image 2, etc.).
• If the human does not mention a model, omit --model and BetterPrompt will use the default model: gemini-3-pro-image-preview.
• If the human does not mention options, omit --options and BetterPrompt will use the default options: {"aspectRatio":"16:9","resolution":"1K"}.
• If the run times out, the response will include a runId you can use to fetch the result later.

Example (using defaults shown above):

betterprompt generate youtube-reaction-thumbnail-maker \
  --input 'main_text=Best MV I've ever seen' \
  --input 'Main_video_or_content=Taylor Swift's Me! MV' \
  --image-input-url https://example.com/image1.png \
  --model gemini-3-pro-image-preview \
  --options '{"aspectRatio":"16:9","resolution":"1K"}'