added swiftlint plugin is not recognised by xcode

You’re going to have to either provide more details (which of the various installs, package, homebrew, etc), or work through the install and configuration issue locally.

Here are the project installation and usage instructions: https://github.com/realm/SwiftLint

Here is an installation and usage video: https://www.youtube.com/watch?v=9Z1nTMTejqU

There are various (diverging) installation paths leading up to the part of the Xcode plug-in installation shown above, so I don’t have a certain way to reproduce this.

And I’m not particularly sure what part of what you’re reporting is not working, without loading and configuring the tool, and there are a half-dozen or so different ways to install this tool. I’m also running a newer version of Xcode than you are too, based on the macOS 12.6 version shown in the footer.

As a test, does invoking swiftlint at the command line work in your current installation environment?

swiftlint help

The project does have an issue tracker, but they’ll likely expect a rather more detailed bug report. Including the version of Xcode involved.

From the repo you’re linking to: “⚠️ There now is an official version in the SwiftLint repo!”

The repo I’d linked to—the official Realm repo—has somewhat more detailed doc.

If that doc doesn’t address your issues, contact the Plug-in provider for assistance.