Then the king answered and said to the woman, “Do not hide from me anything that I ask you.” And the woman said, “Let my lord the king please speak.” The king said, “Is the hand of Joab with you in all of this?” And the woman answered, “As your soul lives, my lord the king, no one can turn to the right or to the left from anything that my lord the king has said. Indeed, it was your servant Joab who commanded me; he put all these words in the mouth of your maidservant. In order to change the appearance of things [between Absalom and you, his father] your servant Joab did this thing. But my lord has wisdom like the wisdom of the angel of God, to know everything that is in the earth.” 2 Samuel 14:18-20
While Saul didn’t know the most basic personal things about his closest and most important palace staff, David was described as wise like the wisdom of the angel of God.
“Wisdom” = 2451. Chokhmah; this feminine noun originates from chakham (2449). It means wisdom, knowledge, experience, intelligence, insight, and judgment. It is always used in a positive sense. True wisdom leads to reverence for the Lord (Job 28:28; Proverbs 2:2) Therefore, skeptics will never find this kind of wisdom (see James 3:13–18), and they will never know the true meaning of life (Proverbs 14:6, 7). Chokhmah is used to describe an entire range of human experience: embroidering (Exodus 28:3), metal-working (Exodus 31:3, 6), military strategy (Isaiah 10:13), diplomacy (Deuteronomy 34:9; 2 Samuel 14:20; Ezekiel 28:4, 5), shrewdness (2 Samuel 20:22), prudence (Psalm 37:30; 90:12; Proverbs 10:31), and practical spirituality (Isaiah. 33:6). God is all–powerful and all–knowing. Therefore, all wisdom has its source in Him (Job 11:6; 12:13; 28:20, 28; Proverbs 2:6; 3:19; Jer. 10:12). Chokhmah is personified only to a point—it does not have a separate existence (Proverbs 1:20; 8:1–31; 9:1, 2). The figure of wisdom was never regarded as independent of God. It is only one of His attributes. – AMG Complete Word Study Bible
A careful examination leads to the inevitable conclusion that this Angel is Yahweh God Almighty.