Transitions.dev: UI transitions for AI agents

Transitions.dev is a collection of UI transitions built for AI agents and web apps. It offers dozens of copy-paste effects like card resize, number pop-in, notification badge, menu dropdown, and modal open/close. Each effect includes animation type and interaction details; some come with performance tips—e.g., using transform instead of mask-position to avoid CPU repaints. Creator Jakub Antalik also provides a skill file to integrate transitions into coding agent workflows. Pro tier unlocks gradient text, smoky dissolve, and more. The post doesn't disclose pricing.