AI assistant

Setting it up

1. 1
   Open the panel

   Assistant in the toolbar, then the Keys tab.
2. 2
   Paste a key

   Any one of the four providers is enough. Keys save as you type.
3. 3
   Test it

   The Test button makes one tiny request and reports the provider's own error if something is wrong.
4. 4
   Pick the provider

   Provider buttons sit above the chat; a green dot means a key is stored.

Providers

What to ask it

• “Design a URL shortener that handles 10k writes/sec” — builds a diagram from scratch.
• “Review my current diagram and name its weak points” — reads the canvas and answers concretely.
• “Add a caching layer and a read replica to this design” — returns the whole updated diagram.
• “Explain the trade-offs between a queue and direct calls here” — plain conversation, no diagram.

Applying a generated diagram

Diagrams are never applied automatically. When one comes back you get three choices: Replace canvas, Add to canvas (appended below your existing work with fresh ids), or Discard. Replacing is undoable with ⌘/Ctrl+Z.

Privacy and safety

• Requests go straight from your browser to the provider. Nautilus has no backend and never sees your key, your prompts or your diagrams.
• Keys live in this browser's local storage. Anything with access to the origin could read them — use project-scoped keys with a spend limit and clear them when you're done.
• Model output is validated before it can reach the canvas: unknown fields, invalid colours, duplicate ids and edges to missing nodes are dropped.
• The conversation is kept locally so closing the panel doesn't lose it; New chat clears it.