I am using this code to get the window title:
tell application \"System Events\"
set frontApp to name of first application process whose frontmost is tru
Building off of Albert's answer, I'd instead do
global frontApp, frontAppName, windowTitle
set windowTitle to ""
tell application "System Events"
set frontApp to first application process whose frontmost is true
set frontAppName to name of frontApp
set windowTitle to "no window"
tell process frontAppName
if exists (1st window whose value of attribute "AXMain" is true) then
tell (1st window whose value of attribute "AXMain" is true)
set windowTitle to value of attribute "AXTitle"
end tell
end if
end tell
end tell
return {frontAppName, windowTitle}
This is a hack and I have no experience, but the advantage is that it doesn't crash if there's no window.