How to get window's name?

[AurevoirXavier]

Some windows don't show a name on the left-top

How can I specify it in -m rule --add app="xxx"?

[rockyzhang24]

Use yabai query along with jq.
E.g., to get the name the currently focused window: yabai -m query --windows --window | jq '.title'.
yabai -m query --windows --window outputs all the fields (information) about the window in json format.
jq can filter and output the fields that you care about.

Some references that help you learn to use yabai:

• Its own wiki page, especially https://github.com/koekeishiya/yabai/wiki/Commands
• All the commands it supports: https://github.com/koekeishiya/yabai/blob/master/doc/yabai.asciidoc