Ask the agent for a change

You need the agent set up first: Claude Code signed in, or a firm key. See Install and open a project.

Open the sample

1. Open the project picker and choose Open sample project.
2. Click Start in BIM.

The sample is a house on a lot. The Regulation tab (⌘2) shows one setback below its minimum.

Ask

1. Press ⌘L to focus the Message field.
2. Type a request, for example "Move the house so the setback passes", and press Return.

A new conversation opens, titled from your message. The agent works on its own copy of the model; the base model does not change. Its reply streams into the chat.

See what it changed

When the turn ends, the conversation shows a card with the elements it changed, and those elements glow in the view. Click a row of the card to zoom to that element.

Compare

1. Press ⇧B, or click Before on the card. The view and the Regulation tab show the model before the turn: the setback fails.
2. Press ⇧B again, or click After, to see the model as the agent left it. If the agent fixed it, the setback passes.

Hold B to peek at Before and let go to come back.

Clip

Keep it or drop it

• Press ⇧⌘↩ or click Accept to put the change on the base model.
• Or press ⇧⌘⌫ or click Discard, then confirm, to drop it.

Next

• Everything about the chat, images and the Strict mode: Agents and chat.
• Comparing, conflicts and undo: Review the agent's changes.