agree with～とagree to～の違いについて

agree with 人　が　基本みたいで、
agree to the plan で正しいですが　
心から賛成する　というニュアンス　で　agree with the plan も可能なようですね

This is not a piece of advice to you I'm talking to myself for my practice of writing skills.
please refer to the site. you can decide it by yourself with confidence unnecessary for any other opinion.
Quara
Agree with — someone.
I agree with you now.
Agree on — a point or issue.
I agree with you on this point.
Agree to — a proposal.
His partner asked him if he agreed to the proposal.
:weblio.
agree to(1.b,c) - proposal,
agree with(2.b) - person
:What's the difference between 'agree with', 'agree on', and 'agree to'?
https://www.quora.com/Whats-the-difference-between-agree-with-agree-on-and-agree-to
:the definition of the word 'agree' on the weblio dictionary.
https://ejje.weblio.jp/content/agree