React · SwiftUI · agent guides
Code card
Code as a glass object: numbered, tinted lines (at most 18) on a dark screen under a CODE · LANG · N LINES tag.
Use it for
- A fenced block of code placed on a canvas: ● CODE · SWIFT · 6 LINES over the lines.
Don't use it for
- Inline code in prose, or an editor. It shows code; it does not edit it.