Additional functionality when selecting brush tool

You can combine actions to achieve it.

from krita import *

app = Krita.instance()
app.action("KritaShape/KisToolBrush").trigger()
erase_action = app.action("erase_action")
if erase_action.isChecked:
    erase_action.trigger()
toggle_assistant = app.action("toggle_assistant")
if toggle_assistant.isChecked():
    toggle_assistant.trigger()

For developing scripts this plug-in may help you.

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