Hi all – thanks for raising this issue. I have submitted a PR to Platformio to fix it in their upstream repository: Fix compatibility with editors where MS Cpptools is not supported by ravirahman · Pull Request #4312 · platformio/platformio-vscode-ide · GitHub
In the meantime, we have forked their extension and republished it in Cursor. Could you uninstall the existing one and search for @id:anysphere.platformio-ide? This one removes the dependency on the unavailable cpp extension. Attaching a screenshot
