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A Chat canvas is a document panel beside a conversation. Cortex can draft it, you can edit it, and it keeps your edits when you close it. It is the right place for a launch announcement, a spec, or anything you want to shape over several turns instead of scrolling back through replies.
Chat with an Untitled document canvas open beside the conversation

A new chat with a document canvas open on the right — “Start writing, or ask Cortex to draft this document.”

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Open a canvas

  • Choose the Docs card on Chat home — Drafts that structure themselves. It opens a new chat with an Untitled document beside it.
  • Or ask in any thread: Draft this as a document I can edit.

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Work in a canvas

  1. Ask Cortex to draft or revise — tighten the intro, add a section on pricing.
  2. Edit directly in the panel. The conversation and the document stay in step.
  3. Close the panel when you are done; your edits are kept with the conversation.

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What writes to it

Canvas tools are part of the tool set a Chat turn can receive, alongside the document readers. A turn reaches them the same way it reaches any other tool — the model asks, Chat runs it. See How Chat works. Two of those tools are for Design boards rather than documents: design_write and design_read. Chat can host a Design canvas through them, and that object opens in the Design desktop app. See Design.

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Canvas, plan, or Library?

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What it is not

There is no /design mode in the web app. Chat can host a Design canvas — the object is created from the conversation — but the working UI for it is the Design desktop app. See Design.

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Related

  • Projects — keep the chat and its document with the rest of the work.
  • Library — attachments the draft can draw on.
  • Design canvases — the other object called a canvas.