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This would be much more interesting if it detailed how the prompt/skills were reverse-engineered. As it is it seems like this could just be the output from “hey Claude write me a system prompt that works like Claude Design”.
> This would be much more interesting if it detailed how the prompt/skills were reverse-engineered

That would enable Anthropic to block the technique.

honestly, i think you can just look at the network tab and see the "content" of the skills. Same has been true for their excel addin and bunch of other things.
This is pretty awesome. I’ve wanted to use Claude design, but with my regular MCP servers.

Side note: ironic use of an llm writing the readme.

I'm calling BS, sorry. It looks light, and barely anything beyond surface level of what we could all could guess would be in a system prompt. This smells nothing more of a "claude give a system prompt that anthropic would use as a system prompt for claude"

From what we know, there are some very specific details baked into the prompt as safety guards, where are those? Again calling BS and I'm not gonna waste more thought/words on this

> Open source, MIT licensed.

I don't think that is how copyright licensing works.

Isn't it, though? What's the copyright status of the output of these tools?
You cannot claim authorship of something that you were not even allowed to take in the first place. How would you then allow rights to somebody else?

Seems pretty obvious to me.

In general I agree with you, especially about how things should work, and find the current trend of claiming LLM-washing code hugely problematic.

I do wonder what the analysis would be of these prompts were vibe-coded, though, since in general LLM output can’t be copyrighted without significant human authorship, and Anthropic is pretty noisy about minimal human supervision.

The minimal human supervision for prompts seems like a pretty silly take. LLMs are still pretty bad at creating good prompts for LLMs. Give it a benchmark and some feedback and it can brute force it, but far less effectively. And I thought the point of using LLMs for development was increased efficiency.
My independent judgement and experience is along your lines, but I’m trying to also take Anthropic seriously:

> “I don’t prompt Claude anymore. I have loops running that prompt Claude and figuring out what to do. My job is to write loops.”

> “Can confirm Claude Code is 100% written by Claude Code”

Both from head of Claude Code. Taken either literally or seriously they point to Anthropic shipping code with limited human authorship.

Oh I certainly believe them. And on some level I admire the dogfooding. It just seems awful foolish of them.
I can't even tell if this repository is based on prompts extracted from Claude Design or if the author had an LLM create all of these prompts in it from scratch.

The fact that they encourage and accept PRs indicates that this isn't intended as a direct prompt extraction exposure project - plus the license, which should indicate they have the authorship necessary to license that content.

Assuming this IS a complete ground-up implementation it really needs to link to demonstrations that it works. Without any evidence it's hard to justify spending time exploring it.

If you ask Claude Design itself to list the names of the skills available to it you get:

  Animated video
  Interactive prototype
  Make a deck
  Make a doc
  Make tweakable
  Claude API in prototypes
  Frontend design
  Wireframe
  Export as PPTX (editable)
  Export as PPTX (screenshots)
  Create design system
  Save as PDF
  Save as standalone HTML
  Send to Canva
  Handoff to Claude Code
Which does not match the structure of this project at all.
Agree, it’s vibe slopped rather than the actual Claude design system prompt
Claude design's prompt is trivial to verify. They bundle it in the frontend bundle and send it on every network request.
I've been using Claude Design to make animated SVGs, and I've learned a thing or two about its limits and how to get around them.

One thing I've learned is that you have to ask it to first come up with a robust way to define the geometry and then apply that to an SVG. Without that first step, it just guesses at where everything should be that isn't directly connected with a node, and it is hilariously bad. But with that first step it is capable of creating some incredible geometry algorithmically from detailed instructions.

The other thing is that whatever tool prepares the svg for export will strip the animations as part of a sanitization process, it won't even see that has occurred. You have to ask it to export to a different file type like my-animation.svg.txt, and then obviously you want to inspect it carefully because svg can carry many exploits not related to animation.

How to prove this is indeed the system prompt against a certain timestamp (in the past ) ?