estar de acuerdo vs acordar
'Agree' needs two Spanish forms. Estar de acuerdo is to share an opinion. Acordar is to settle a decision together.
estar de acuerdo
To agree in opinion — you think the same as someone else.
Estoy de acuerdo contigo.
I agree with you.
Always estar de acuerdo, never 'ser de acuerdo'. Use con + person.
No estamos de acuerdo en eso.
We don't agree on that.
Disagreement. 'En' introduces the topic.
¿Estás de acuerdo con la propuesta?
Do you agree with the proposal?
Agreement with an idea.
acordar
To agree on a decision or arrangement — make a deal.
Acordamos un precio.
We agreed a price.
A negotiated outcome. Active verb of making an agreement.
Se acordó cerrar la tienda.
It was agreed to close the shop.
Passive se for formal decisions.
Nos pusimos de acuerdo en la fecha.
We agreed on the date.
Ponerse de acuerdo = to reach agreement. Common in conversation.
Tricky bit
'Acordarse' is to remember, not to agree. 'Acordamos' = we agreed, 'nos acordamos' = we remember. The reflexive changes the whole meaning.