CastKit
The trusted marketplace for AI agent skills.
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Karim Gharabawi

CastKit - The trusted marketplace for AI agent skills.

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CastKit is a security-first marketplace for AI Agent Skills — the universal standard adopted by OpenAI, Google, Microsoft, and Anthropic. Browse and download from 1,369 verified skills, each presented as a unique trading card with AI-generated artwork. Our Threat Grimoire exposes 341 malicious skills found on GitHub, so you know exactly what to avoid. Free to use, built for developers and AI builders who want powerful agent capabilities without the security risk.

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Karim Gharabawi
Maker
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Hey Product Hunt! I'm Karim, the maker of CastKit. The AI agent ecosystem is exploding — over 214,000 skills were created in just the last two months. But here's the problem: they're scattered across GitHub with no verification, and many are outright dangerous. I found 341 malicious skills designed to steal API keys, exfiltrate data, and worse. That's why I built CastKit. It's a marketplace where every skill is security-verified before it's listed. I also published all 341 threats in what I'm calling the Threat Grimoire — a searchable database so developers know what to watch out for. To make the experience more fun, I gave it a trading card aesthetic. Each skill has unique AI-generated artwork, stats, and rarity. Think of it as collecting powerful tools for your AI agents. CastKit is completely free to browse and download. My goal is to make this the safest, most comprehensive directory of agent skills anywhere. I'd love your feedback — what features would make this more useful for you? I'm here all day to answer questions!