I'm not sure I can agree to that.

Meaning

I'm hesitant to accept your proposal.

Examples

• John: I need you to finish this project by Friday.
• Alice: <b>I'm not sure I can agree to that.</b> The deadline is very tight.
• John: Can we find a compromise? What if we extend it to Monday?
• Alice: Okay, Monday works. Thanks for understanding. Although, <b>I'm not sure I can agree to that</b> much extra work.