Is an agreement an agreement?

Your partner opens 2 Diamonds, RHO asks, and you explain it as a weak two. RHO bids 2NT and it is your call. You hold

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Qx
KJxxx
98xxx


You are playing with your partner for the first time. He came late, so there was no time to talk about hardly anything. You gave him your card, which said 2 Diamonds is weak. It's not clear how much time he had to look at the card, but it wasn't much, and it's not clear what he read. Or remembered. It's probably more common here to play 2D as Flannery, 4-5 in the majors with an opening hand.

So, first question, what do you bid?

The player decided to pass. I think that's a reasonable bid, given the high probability that partner might have the Flannery hand.

And, second question, did she fulfill her legal obligations to explain partner's bid? If not, what should she have said?
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