Create and store a custom Python system toolbox in ArcGIS Pro

Summary

The instructions provided describe to create a Python toolbox and store it as a system toolbox in ArcGIS Pro, easily accessible for any project through the Geoprocessing pane, and intended for all users.

Note:
The web help document, ArcGIS Pro: Adding toolboxes in Python describes how to add a Python toolbox in ArcGIS Pro. The article also mentions the a Python toolbox can be stored as a system toolbox in ArcGIS Pro, however, the document does not provide any instructions on how to do so.

Procedure

1. In the Catalog pane in ArcGIS Pro, right-click the designated project folder and select New > Python Toolbox.

Note:
The Catalog pane is called the Project pane in ArcGIS Pro prior to version 2.0.

2. Add desired tools into the toolbox.

3. Edit the toolbox in a Python IDE environment, by right-clicking toolbox > Edit. This opens the Python toolbox script in a text editor, for example, Notepad.

4. Find the class Toolbox(object): section of the script.
5. Set self.label and self.alias equal to the chosen name for the toolbox. The following code snippet shows the sample of what the final script looks like.

class Toolbox(object):
    def __init__(self):
        """Define the toolbox (the name of the toolbox is the name of the
        .pyt file)."""
        self.label = "ToolboxTest1"
        self.alias = "PythonToolbox"

6. Save and close the script.
7. In Windows Explorer, navigate to the folder where the toolbox is stored.
8. Copy the toolbox file and its accompanying XML document(s) and paste into the following file path:

C:\Program Files\ArcGIS\Pro\Resources\ArcToolBox\Toolboxes