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Seems like where anthropic or openai want to go, there are no editors anymore.

I personally want better read-only code tools, or maybe the return of UML?

I think it's the other way around. OpenAI is definitely recreating the IDE from scratch with codex app.

Hmm has there been much success just feeding mermaid diagrams to an agent and having it generate code to implement it?

I imagine many people have tried this but I haven’t yet. And mermaid swim lane diagrams are my go to tool for designing system architecture.