We've been building Skly (https://skly.ai), a marketplace for AI skills and rules. Skills follow the open Agent Skills format (agentskills.io), which includes a SKILL.md file with YAML frontmatter, optional scripts, references, and assets. They function across Claude, Codex, Cursor, Antigravity, and other agentic environments through progressive disclosure.

We just published our complete skill documentation. It covers the format specification, best practices for writing skills that actually work, and platform-specific guides for Claude, Codex, and Antigravity.

I'm curious to know what the HN community thinks about the idea of a marketplace for AI agent skills. Is this something you would buy or sell on?