Borrowing it
Nothing to install: this file belongs to greg-prospyr/thumbcraft-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/greg-prospyr/thumbcraft-skills/main/AGENTS.mdgit clone --depth 1 https://github.com/greg-prospyr/thumbcraft-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/greg-prospyr/thumbcraft-skills/agents-md)<a href="https://agentmods.dev/instructions/greg-prospyr/thumbcraft-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/greg-prospyr/thumbcraft-skills/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/greg-prospyr/thumbcraft-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/greg-prospyr/thumbcraft-skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00290 | $0.00290 |
| Opus 5 | $0.00145 | $0.00145 |
| Sonnet 5 | $0.00058 | $0.00058 |
| Haiku 4.5 | $0.00029 | $0.00029 |
Grade A, and why
thumbcraft-skills AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Agent Instructions
This repository contains skills for AI agents to generate YouTube thumbnails using the Thumbnail Creator API.
For AI Agents
The main skill is located at thumbnail-creator/SKILL.md. Load this file to gain the ability to:
- Generate AI thumbnails from text prompts
- Analyze YouTube videos for thumbnail ideas
- Manage styles, faces, and brands
- Generate SEO-optimized titles and descriptions
Quick Reference
MCP Endpoint
https://app.thumbcraft.io/api/mcp
Available MCP Tools
generate_thumbnail- Create thumbnails from promptsanalyze_video- Get thumbnail concepts for a YouTube videolist_thumbnails- Get recent thumbnailslist_faces- Get available face modelscreate_face- Add a new facelist_styles- Get saved styleslist_brands- Get brand assetsgenerate_seo_titles- Get 10 title optionsgenerate_seo_description- Get complete descriptionget_credits- Check credit balance
Authentication
All requests require:
Authorization: Bearer API_KEY
Additional References
thumbnail-creator/references/prompt-examples.md- Example promptsthumbnail-creator/references/rest-api.md- REST API details
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 43 lines · 290 tokens per session scan A 97145baadf41
thumbcraft-skills AGENTS.md is an instructions file published in the GitHub repository greg-prospyr/thumbcraft-skills (2 stars, last pushed 7mo ago), licensed MIT. It adds 290 tokens to every session, about $0.0014 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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