Muapi Youtube Thumbnail
- 1.6k installs
- 4k repo stars
- Updated August 4, 2026
- samuraigpt/generative-media-skills
muapi-youtube-thumbnail is a generative-media skill that designs high-CTR YouTube thumbnails via the MuAPI service for developers who need publish-ready cover art from a video title and optional channel style.
About
muapi-youtube-thumbnail is a version 1.0.0 agent skill in samuraigpt/generative-media-skills that calls the MuAPI service to produce YouTube-ready thumbnail images from structured inputs. Developers supply a required video title and optional channel_style defaults such as bold high-contrast tech aesthetics; the skill applies CTR-oriented layout guidance including striking imagery, bold text placement, and emotional face or subject treatment when appropriate. The workflow accepts license terms and returns finished thumbnail artwork suitable for upload pipelines or CMS automation. Reach for muapi-youtube-thumbnail when you have a finalized title and need consistent, on-brand cover images without opening a separate design tool.
- Generates custom YouTube thumbnails via MuAPI integration
- Agent skill optimized for Claude Code and Cursor workflows
- Produces ready-to-use image assets for video content
- Reduces manual design time for creators and indie hackers
Muapi Youtube Thumbnail by the numbers
- 1,601 all-time installs (skills.sh)
- +185 installs in the week ending Aug 5, 2026 (Skillselion tracking)
- Ranked #187 of 1,335 Generative Media skills by installs in the Skillselion catalog
- Data as of Aug 6, 2026 (Skillselion catalog sync)
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| Installs | 1.6k |
|---|---|
| repo stars | ★ 4k |
| Last updated | August 4, 2026 |
| Repository | samuraigpt/generative-media-skills ↗ |
How do you auto-generate YouTube thumbnails from a title?
Automatically generate eye-catching YouTube video thumbnails using the MuAPI service.
Who is it for?
Developers automating YouTube publishing workflows who need CTR-focused thumbnails from text inputs alone.
Skip if: Developers who need full video editing, A/B analytics dashboards, or manual pixel editing inside Figma.
When should I use this skill?
A developer asks to create, regenerate, or batch-produce YouTube thumbnail artwork from a video title or topic string.
What you get
Finished YouTube thumbnail image file aligned to title and channel style inputs.
- YouTube thumbnail image
By the numbers
- Skill version 1.0.0 in samuraigpt/generative-media-skills
- Requires 1 mandatory input (title) plus optional channel_style
Files
YouTube Thumbnail
Design a high-CTR YouTube thumbnail — striking imagery, bold text placement, and emotional face/subject if needed.
Inputs
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
title | text | yes | — | The video title or topic (e.g. "I tried 7 AI tools in 24 hours — here's what happened"). |
channel_style | text | no | bold, high contrast, bright colors, clean design, YouTube tech aesthetic | Channel brand style (e.g. "dark moody gaming", "bright educational", "minimal corporate"). |
subject_description | text | no | — | Optional description of the person or subject to feature (e.g. "a surprised young man in a hoodie"). |
Steps
Thumbnails are the #1 factor in YouTube CTR. Generate a single, maximum-impact 16:9 image.
Phase A — Plan the composition
Before generating, briefly reason about the best thumbnail formula for this topic:
- Emotion-first: shocked/curious face if relevant + bold text = high CTR
- Text overlay: 3–5 words max, high-contrast (white/yellow on dark, or vice-versa)
- Contrast & saturation: thumbnails compete in a grid — they must pop
Phase B — Generate the thumbnail
1. Build the image generation prompt:
- Subject:
{{subject_description}}if provided, otherwise design an object/scene that dramatizes the topic. - Mood: derives from
{{channel_style}}. - Composition: rule-of-thirds, subject on left or right with empty space for text.
- Style tags:
{{channel_style}}, youtube thumbnail composition, ultra detailed, vibrant, high contrast, 16:9.
2. Call muapi image generate (model=gpt-image-2-text-to-image, aspect_ratio=16:9).
Phase C — Text overlay guidance
After generation, return:
- Suggested overlay text: 3–5 bold words that complement the title
{{title}}. - Text placement: where on the canvas to position text (e.g. "bold yellow text, top-right third").
- Font recommendation: style suggestion (e.g. "Impact-style all-caps with black outline").
Notes
- Never put too much text in the prompt — text rendering in image models is unreliable. Guide the user on adding text in post-production (Canva, Photoshop).
- If the user already has a channel image or face photo in the session, use
muapi image editto incorporate it. - Suggest A/B variants only if the user asks.
Trigger Keywords
youtube thumbnail, yt thumbnail, thumbnail, video thumbnail, youtube cover
---
Notes for the Executing Agent
- This recipe is LLM-orchestrated: read each phase, gather any missing inputs from the user, then call
muapiCLI commands. Usemuapi auth configurefirst ifMUAPI_API_KEYis unset. - For model IDs without a CLI alias yet, fall back to the raw endpoint via
curl -X POST https://api.muapi.ai/api/v1/<endpoint> -H "x-api-key: $MUAPI_API_KEY" -H 'content-type: application/json' -d '{...}'and poll withmuapi predict wait <request_id>. - Substitute
{{input_name}}placeholders with the user's actual inputs before issuing each call.
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Pick muapi-youtube-thumbnail when you need finished YouTube cover art from a title string rather than general-purpose image prompts or in-editor design work.
FAQ
What inputs does muapi-youtube-thumbnail require?
muapi-youtube-thumbnail requires a title text field and accepts an optional channel_style string defaulting to bold, high-contrast, bright colors, and a clean YouTube tech aesthetic before calling MuAPI.
Does muapi-youtube-thumbnail use MuAPI?
muapi-youtube-thumbnail routes thumbnail generation through the MuAPI service and includes acceptLicenseTerms: true in its skill manifest at version 1.0.0.