Napkin — Visual Whiteboard for Copilot CLI

Napkin gives users a browser-based whiteboard where they can draw, sketch, and add sticky notes to think through ideas visually. The agent reads back the whiteboard contents (via a PNG snapshot and optional JSON data) and responds conversationally with analysis, suggestions, and next steps.

The target audience is lawyers, PMs, and business stakeholders — not software developers. Keep everything approachable and jargon-free.

Activation

When the user invokes this skill — saying things like "let's napkin," "open a napkin," "start a whiteboard," or using the slash command — do the following:

1. Copy the bundled HTML template from the skill assets to the user's Desktop.
   • The template lives at assets/napkin.html relative to this SKILL.md file.
   • Copy it to ~/Desktop/napkin.html.
   • If ~/Desktop/napkin.html already exists, ask the user whether they want to open the existing one or start fresh before overwriting.