Things I've built — mostly so I'd want to use them.

Generate Claude, Copilot, Codex, and Gemini agent definitions from a single shared source tree. Each runtime has its own quirks, file layouts, and tool conventions; custom_agents abstracts those differences so a team can express agent behavior once and ship to all of them.

Highlights: lossless conversions, dialect-specific extensions, and a small CLI for diffing what each runtime would receive.