הן [הִנֵּ֤ה] אָֽנֹכִי֙ בָּרָ֣אתִי חָרָ֔שׁ נֹפֵ֙חַ֙ בְּאֵ֣שׁ פֶּחָ֔ם וּמוֹצִ֥יא כְלִ֖י לְמַעֲשֵׂ֑הוּ וְאָנֹכִ֛י בָּרָ֥אתִי מַשְׁחִ֖ית לְחַבֵּֽל׃
Behold, I have created the smith That bloweth the fire of coals, And bringeth forth a weapon for his work; And I have created the waster to destroy.
Rashi on Isaiah
Behold I am He Who created a smith who devises a weapon, and I am He Who has created a destroyer that destroys it. That is, to say: I am He Who incited the enemy against you; I am He Who has prepared retribution for him.
Ibn Ezra on Isaiah
Behold, I have created the smith, etc. It is a figurative expression.
Rashi on Isaiah
and produces a weapon for his work For necessity. He completes it according to all that is necessary.