It appears you just have to monitor for the maximum amount allowed, but not monitoring individuals, i.e., if they are 55 or older, etc.
Q-73. Is there a limit on the annual HSA contribution which the trustee or custodian may accept?
A-73. Yes. Except in the case of rollover contributions described in section 223(f)(5) or trustee-to-trustee transfers, the trustee or custodian may not accept annual contributions to any HSA that exceed the sum of: (1) the dollar amount in effect under section 223(b)(2)(B)(ii) (i.e., the maximum family coverage deductible) plus (2) the dollar amount in effect under section 223(b)(3)(B) (i.e., the catch-up contribution amount). All contributions must be in cash, other than rollover contributions or trustee-to-trustee transfers. See section 223(d)(1)(A).
Q-74. Is the HSA trustee or custodian responsible for determining whether contributions to an HSA exceed the maximum annual contribution for a particular account beneficiary?
A-74. No. This is the responsibility of the account beneficiary, who is also responsible for notifying the trustee or custodian of any excess contribution and requesting a withdrawal of the excess contribution together with any net income attributable to the excess contribution. The HSA trustee or custodian is, however, responsible for accepting cash contributions within the limits in Q&A 73 and for filing required information returns with the IRS (Form 5498-SA and Form 1099-SA).
Go here:
http://www.treasury.gov/press/releases/reports/hsanotice200450072304.pdf