Context: this sub-skill is one lens of the broader ui-craft skill. If the ui-craft skill is also installed, read its SKILL.md first for Discovery + Anti-Slop + Craft Test, then apply the specific lens below.

Add or fix animations in the target the user described. Load the ui-craft skill.

Step 1 — Decision Ladder: run the Decision Ladder from references/motion.md first. Anything that fails it gets removed, not improved.

Step 2 — Pick the library:

If user opted into a stack during Discovery → read references/stack.md. Use the matching section (Motion, GSAP, or Three.js). Never mix libraries on the same property.
Otherwise → CSS transitions / @keyframes / animation-timeline: view() only.

Step 3 — Apply motion budget:

animate