What can I ask Siri on macOS?
Siri can do all kinds of things, like alter system settings, open applications, check storage on iCloud, and more. Here’s what OS X Daily has gathered up so far, though some of these double-over on iOS as well:


Put my computer to sleep
Activate the screen saver
Make the screen brighter
Make the screen dimmer
Is Bluetooth on?
Turn Bluetooth off / on
Lower the volume
Increase the volume
Show me privacy settings
Show me location settings
Show me network settings
What is my desktop wallpaper
I forgot my iTunes Password
How fast is my Mac?
How much memory does my Mac have?
How much free disk storage is available?
What is my Mac serial number?
What OS version is this?
How much iCloud storage do I have?
Open Mail application
Open Safari
Open Messages
Open the website for OSXDaily.com
Open the webpage (site name or site URL)
Send a message to (name) saying (message)
Open the Documents folder
Open the Pictures folder
Show me files named “screen shot”
Show me files from yesterday
Show me image files from last week
Show me documents from two days ago
Show me what I was working on yesterday
Show me my music
Play (song name) in iTunes
What song is playing?
Skip this song
Remind me to call (name) in 20 minutes
Show me pictures from last October
Show me my photos from Hawaii