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Is TCP MSS a value both communication peers agreed up?


I now that TCP MSS (max segment size) value is telling the peer "I can receive xxx bytes of data". I am wondering if both side will agree upon a min value or each side can use their own claimed size. For example, if A says I can receive 1460 Bytes while B said I can do 1200 Bytes. Will 1200 be picked up as the max MSS size on this tcp session? or A can only send max to 1200 bytes to B, while B can send max of 1460 Bytes of data to A?

Thanks! -Steve