ruff/crates/ruff_server/docs/setup/KATE.md

Kate Setup Guide for ruff server

1. Activate the LSP Client plugin.
2. Setup LSP Client as desired.
3. Finally, add this to Settings -> Configure Kate -> LSP Client -> User Server Settings:

{
  "servers": {
    "python": {
      "command": ["ruff", "server", "--preview"],
      "url": "https://github.com/astral-sh/ruff",
      "highlightingModeRegex": "^Python$",
      "settings": {}
    }
  }
}

See LSP Client documentation for more details on how to configure the server from there.

!IMPORTANT

Kate's LSP Client plugin does not support multiple servers for the same language.