My first thought: a "harassment-free experience" is an extraordinarily low bar for members' and guests' conduct. It would be reasonable for an anti-harassment policy, but for a code of conduct I think it is important to have a list of behaviors that the community strives for. Things like: what respecting someone's boundaries looks like, how to handle low-level conflicts, what a soft "no" may look like (if that is an issue), etc. 

Positive descriptions and "as a member, you agree to do X" act as community documentation for the honestly awkward and clueless while removing plausible deniability for those who think that anything not forbidden is permitted.