yt-thumbnail-brief SKILL.md skillA
This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.
yt-thumbnail-brief from sergebulaev/youtube-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sergebulaev/youtube-skills/yt-thumbnail-brief@git:20260909.9ed0a30Pins git:20260909.9ed0a30 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sergebulaev/youtube-skills
- Path
skills/yt-thumbnail-brief/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260909.9ed0a30, committed Sep 9, 2026
- First version recorded
- Jul 2, 2026
- Size
- 5,727 bytes
- Repository stars
- 89
- License
- MIT
Turn a YouTube video idea into a designer-ready thumbnail brief: focal subject, face and emotion, a text overlay of 4 words or fewer that the title does not repeat, contrast and composition, and 2 to 3 A/B concepts for Test and Compare. Built on 2026 principles (one focal point, legible at 120 pixels, complements the title). Outputs the brief plus the Publora attach step (the image upload itself is out of band). Use to plan a thumbnail. Not for title words (use yt-title-optimizer).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# YouTube Thumbnail Brief This skill does not generate an image. It writes the brief a human designer (or an image tool) executes, grounded in what actually drives the click in 2026, and documents how a custom thumbnail gets attached when you auto-publish. ## When to use - User says "what should the thumbnail be for this video" - User wants a brief to hand to a designer or paste into an image generator - User wants 2 to 3 thumbnail concepts to A/B test - User is auto-publishing and needs the thumbnail upload steps ## What the brief contains For each concept the skill outputs: - **Concept name and the angle** it sells (and how it complements the title). - **Focal subject:** a face plus the specific emotion, or the object/result. - **Text overlay:** the exact words (4 or fewer), and where they sit. Never the same words as the title. - **Background and contrast:** color, lighting, and how the subject separates. - **Composition:** rule-of-thirds placement, gaze direction, crop. - **120-pixel test note:** what must still read when shrunk to mobile size. ## Steps 1. **Gather inputs.** The title (so the thumbnail complements, never repeats it), …
Read the whole file at its exact version.
How to install
mdr add sergebulaev/youtube-skills/yt-thumbnail-brief@sha256:8a43fccbf648adbdThe line at the top of this page pins the label git:20260909.9ed0a30, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_epobwh2s2gkypd36)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jul 2, 2026 and Sep 9, 2026, about one every 34 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260909.9ed0a30 latest | 2026-09-09 | 9ed0a30 | 5,727 B | A | view · diff |
| git:20260905.90a2ff2 | 2026-09-05 | 90a2ff2 | 5,725 B | A | view · diff |
| git:20260702.2358908 | 2026-07-02 | 2358908 | 5,631 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (5727 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
sergebulaev/youtube-skills · 89 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_epobwh2s2gkypd36 GET https://markdownregistry.com/api/v1/resolve?ref=sergebulaev/youtube-skills/yt-thumbnail-brief GET https://markdownregistry.com/api/v1/blob/8a43fccbf648adbd95fc073cce1472482a26842154407bc5c35f770b2f80e281
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from sergebulaev/youtube-skills
Every file in sergebulaev/youtube-skills