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design

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How to fill and revise a canvas made from the Design (canvas) appifact type.

Anthropic/artifact-types/design/SKILL.md

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Nov 10, 2026
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CC0-1.0

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# Design

This artifact is one release of the Design (canvas) editor.
A canvas serves it read-only plus ITS OWN files under `project/`. It inherits
the capabilities  
`{"downloads":{},"artifact":{},"comments":{"composer_only":true,"customAnchors":true},"room":{},"db":{"rules":[{"path":"","write":"admin"}]},"assets":{},"user":{"scopes":["profile"]},"sample":{}}`  
and its contract `"0.2.47"`.

**Write only under `project/`**: a file elsewhere never shows; the type's files are refused.

## The canvas exists

Work on THAT canvas, its `url` on every call: never
create another or send `type_url` again. If no canvas exists yet: one
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