In many triggers, actions and constraints you will have the option to configure some textual fields. Often you will find a button next to the text entry field that contains the "..." label. This button will display a complete list of "magic text" fields that are available in the context that is being used.
The magic text allows some other value to be substituted at the point of invocation, rather than standard static text that will never changed. For example it's possible to add and action that reference a variable via magic text and that variable's value will be substituted at the point that action is run.
Full list of static magic text options NOT dependant on triggers:
MacroDroid mode
-Stopwatches-
-Variables users have created-
String variable length
String variable value
Dictionary/Array size
New line
Foreground app name
Foreground app package
Current brightness
Current brightness (Android 9+ alternative)
Screen timeout (seconds)
Current battery %
Battery temp ºC
Power (on/off)
Clipboard text
Current IP address
Current IP address (V6)
Wifi SSID
Wifi signal strength
Cell tower signal strength
Day of the week
Day of the month
Week of year
Month
Month (as digit)
Year
Hour of day
Hour of day (12h)
Minute
Second
am/pm
System time
Webhook Base Url
System setting (System)
System setting (Global)
System setting (Secure)
Cell connection type
Mobile country code
Mobile network code
Location area code
IMEI
Cell id
Last known location (lat,lon)
Last known location (lat)
Last known location (lon)
Last known location (altitude)
Last known location (accuracy meters)
Last known location (link)
Last known location (time)
Last location speed (kmh)
Last location speed (mph)
Current volume (Alarm)
Current volume (Media / Music)
Current volume (Ringer)
Current volume (Notification)
Current volume (System sounds)
Current volume (Voice call)
Current volume (Bluetooth voice)
Macro name
Macro category
Device serial
Device name
Device uptime
Device uptime (s)
Device manufacturer
Device model
Macrodroid version
Macrodroid is pro
Android version
Android version (SDK level)
Sim operator name
Screen resolution
Screen resolution (X)
Screen resolution (Y)
RAM (Total)
RAM (available)
Storage total (external)
Storage free (external)
Storage total (internal)
Storage free (external)
List of additional magic text dependant on triggers:
App installed/updated/removed trigger: Application name Application package
Application opened/closed trigger: Application name
Call triggers: Call name Call number
Bluethooth (Device connected or device disconnected): Bluethooth device name
SMS recived: Incoming SMS contact incoming SMS message incoming SMS number
Logcat: Logcat entry line