Image annotations

Add precise visual callouts to screenshots, diagrams, and demo frames by drawing rounded rectangles, leader lines, and short labels with consistent colors, padding, and typography.

When to invoke

• "Highlight this area in a screenshot for my PR."
• "Annotate the before and after images."
• "Add labels and arrows to this architecture diagram."
• "Create annotated frames for a GIF demo."
• "Mark what changed in this UI image."

Prerequisites and context

Install Pillow only if the project environment does not already provide it: