Yes, I know. And an IDE by any acceptable definition needs a text editor.
An integrated development environment (IDE) is a software application that provides comprehensive facilities for software development. An IDE normally consists of at least a source-code editor, build automation tools, and a debugger.
Fair point. Increasingly the workflow for multi-agent systems involves structured agent instructions (almost resembling code), testing, connecting tools and improving agents. Given this we decided to call it an IDE.