> But then again I was never a "designer" – more a builder.

Same here. I work in Claude Code all day long on slightly complex b2b apps, and the builder MVP for what I want to do with Claude.ai, to work on ideas is far simpler.

I just want to be able to create a React artifact prototype on claude.ai, then share it privately with a stakeholder (internal or external.) I want to allow those users to prompt changes, then see their changes in the artifact.

The bespoke design is not what I am really worried about at this phase. For b2b prototype stuff, claude.ai already does an excellent job with just a bit of project-specific prompting.

Why is this shared artifact building not yet doable? This seems "so simple." Yes, maybe some shared artifact specific git to allow version control is required, but is my ask really that hard, or unique?