Sentence examples for his agreement from inspiring English sources

"his agreement" is a grammatically correct phrase that can be used in written English.
You can use it when referring to a specific person's approval or consent to something. For example: "I asked John if he was okay with the new project, and he gave his agreement by nodding his head." "The two parties reached an agreement, with Mark signing the contract as his agreement to the terms." "Despite their differences, they were able to come to a mutual agreement by respecting each other's opinions."