Adding on to Mr.rM's post, 太 + Adj. + 了 just happens to be a common fixed pattern in Chinese.

As is the case in this sentence, it usually means "too [adj.]" and carries a complaining tone (though it can also be used positively, e.g., "太好了!").

Here is some further reading on 太...了 if you're interested. :)

It is not strictly required, but it can make your tone different.