List every claude.ai/design project you can open, with its projectId and whether it is a design system. Start here to pick the right project.

The template tiles on the Claude Design home screen (Blank, Mobile app design, Slides, Wireframe, Diagram and the rest). Use before create_project to pick one by name.

Start a brand new project from the home screen: pick a template, describe what to create, and it begins building. Returns the new projectId. Claude Design names the project from your prompt. Attach local images (screenshots, references) with attachments to design from them.

Create an empty design-system project. A project type is fixed at creation and cannot be changed later, so a design system has to be made as one from the start. Push components into it with write_files, then attach it to projects with link_design_systems so their chats design against it.

Set which design systems a project designs against. Replaces the current set, so pass every one you want kept. Pass an empty list to detach all.

Point a project at one of the connected GitHub repositories, so new designs start from the product that already exists. Requires GitHub to be connected on the account already; this will not perform an OAuth grant.

Attach a folder from this machine to a Claude Design project, so it designs against your real code. Sends text files only, skipping .git, node_modules and build output, bounded by file count and total size. Point it at the frontend or design-system folder rather than a whole monorepo.

Push a Figma .fig file from disk into a project through the import menu.

Write or overwrite files in a Claude Design project or design system. Use to push components, tokens or assets up from the repo. Overwrites without asking, so read first if unsure.

List the chat threads inside one Claude Design project, newest first, marking which one is active.

Read what Claude Design has said. Returns the tail of the transcript for one chat. This is the read side of the conversation: use it after send_prompt, or on its own to catch up on what was discussed in the browser.

Give Claude Design an instruction in one project and wait for it to finish, then return what it said and which files it touched. It runs its own agent loop (reading and writing project files, taking screenshots), so a single prompt can take minutes. Sends into the project's active chat.

Bring the Claude Design window on screen and open a project, optionally a specific chat and a specific file, so the user can watch. Use this before send_prompt when the user should see the work happen, and to show them a finished screen. The browser normally sits parked offscreen, so nothing is visible until this is called.

Capture what a page in a Claude Design project actually looks like and return it as an image, so you can judge the work rather than taking the designer's word for it. Use it after send_prompt to check the result, before sending a revision so your critique is specific, and whenever the user asks whether something looks right. Captures the rendered design out of the viewer, without the app's own UI around it.

Make a different chat thread active in a project. send_prompt always posts into the active chat, so use this to aim it at the right conversation.

List the files in a Claude Design project.

Read a file straight out of a Claude Design project, no download needed. A .dc.html page runs to hundreds of KB, so use offset/limit to read a slice, and search_code first to find the line you want.

Grep the project's own files for a regex and get back matches with line numbers and context. This is how you find what Claude Design actually built without downloading anything: locate the markup or token, then read_file that region.

Download files from a Claude Design project into a local directory, preserving paths. Handles binaries.

Permanently delete a Claude Design project or design system. There is no trash and no undo. Ask the user before calling this, then pass the project's exact current name as confirmName: the call is refused if it does not match, which is what stops the wrong project being deleted.

Permanently delete files from a Claude Design project. No undo. Verifies they are gone.

Permanently delete one chat thread from a project, including its transcript. No undo.

Shut the background Chrome down and flush its profile. Call this when you are done for a while.