What is the purpose of Arguments in Xcode External Build Tool Configuration?

Question

By default, there is a use of $(ACTION). What is the usage of this parameter and field? Is it related to the previous field (the path of the build tool)?

Answer 1

$(ACTION) refers to the value of the Xcode build setting named ACTION. The typical use is to allow invocations via xcodebuild, such as xcodebuild install, to trigger a different actions in external build tools invoked from the Xcode project.