Tawhid in Actions is also like Tawhid in Essence in the sense that the origin of every action in the world of being is the Divine Sacred Essence, and will finally relate to Him.
We should know that every Action that we ascribe to Him will be the same as His other Action, and there is no difference and distinction among the Actions of God, and the apparent duplicity in the Actions of God is caused by our perception:
﴾وَلاَ تَقُولَنَّ لِشَيْءٍ إِنِّي فَاعِلٌ ذَلِكَ غَدًا إِلاَّ أَنْ يَشَاءَ اللَّهُ وَاذْكُرْ رَبَّكَ إِذَا نَسِيتَ﴿
Do not say about anything, ‘I will indeed do it tomorrow,’ without {adding}, ‘if Allah wishes.’ And when you forget, remember your Lord.
So, all our wishes are within the domain of His will and all the actions of God are one:
لاَ حَوْلَ وَلاَ قُوَّةَ إلاَّ بِاللهِ العَلِيِّ العَظِيمِ
“There is no might and power except from Allah, the Exalted and Great.”
Those who have such belief, attributing all actions to God have the belief in Tawhid in Action.
Source:
A New Analysis of Wahhabi Doctrines
By: Muhammad Husayn Ibrahimi
ABWA Publishing and Printing Center
[Pg. 20-21].