I think for the time being Malfoy wants this to happen and chose to accept Harry's right to enter an agreement...but if something goes wrong, I wouldn't put it past Lucius to spin this into an invalid contract due to Harry's age. Or maybe Harry has done so many crazily adult things so far this actually feels perfectly normal, not only to the readers, but the characters.
From what we have seen so far, it would rather appear that Harry's signature is just as valid as if he had been an adult. He can be overruled by Dumbledore but it is not required that Dumbledore signs the papers for him.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 97. The previous thread is at nearly 500 comments.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system.
Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: