CastKit – A security-first marketplace for AI agent skills

Summary: CastKit is a free, security-focused marketplace offering 1,369 verified AI agent skills standardized by major providers like OpenAI and Google. It features a searchable database of 341 known malicious skills to help developers avoid security risks when integrating AI capabilities.

What it does

CastKit provides a curated platform where developers can browse and download verified AI agent skills, each displayed with AI-generated artwork and detailed metadata. It also maintains the Threat Grimoire, a database exposing malicious skills found on GitHub.

Who it's for

It is designed for developers and AI builders seeking secure, powerful agent skills without the risk of integrating harmful code.

Why it matters

CastKit addresses the problem of unverified, scattered AI skills by offering a trusted, centralized source that mitigates security threats in the rapidly growing AI agent ecosystem.