What is the Cartesian Circle criticism of Descartes’s reasoning?

The Cartesian circle is a classic critique of René Descartes’s reasoning in his Meditations on First Philosophy. Critics argue that his logic is circular because he uses two interdependent premises to validate one another.1

Descartes asserts that any idea he perceives "clearly and distinctly" must be true because a benevolent God, who is not a deceiver, would not allow him to be mistaken about such perceptions. However, to establish the existence of God, Descartes relies on his own clear and distinct reasoning.1

The circularity arises because:
* He claims clear and distinct perception is reliable only because God exists.1
* He claims God exists because he has a clear and distinct perception of the proof.1

Consequently, he cannot verify the validity of his proof for God’s existence without first assuming the reliability of the very perceptions he is trying to prove. This logical loop remains one of the most famous challenges to his epistemological framework.1