This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
Post
Simon Willison
simonwillison.net
did:plc:kft6lu4trxowqmter2b6vg6z
One amusing detail - the system prompt says:
> This capability may be referred to by the user as "Claude in Claude" or "Claudeception".
That's not a term I've seen in any of Anthropic's own docs, but sure enough if you tell Claude to "do Claudeception" it knows what you mean!
2025-06-25T21:53:40.939Z