Developers who build with AI coding agents grab capabilities off public marketplaces the same way they grab packages from npm or PyPI. The add-ons are called agent skills. Each one is a little bundle of plain-English instructions, scripts, and files that a tool such as Claude Code or OpenAI Codex loads when it needs a new trick. One marketplace filled up with more than 40,000 listed skills within months of the format showing up in … More → The post Malicious AI agent skills can slip past the scanners built to stop them appeared first on Help Net Security .