Gratuitous on 3105-06: Rule 478, relevant excerpt:
Where the rules define an action that CAN be performed "by announcement", a person performs that action by unambiguously and clearly specifying the action and announcing that e performs it. Especially in light of these cases, I argue that the scope of "unambiguously and clearly" includes "announcing that e performs it", and that the identity of Mister Snuggles is substantially ambiguous due to non-trivial knock-on effects (e.g. if Mister Snuggles initiated a judicial case, then is ais523 eligible to judge it?). Contrast a previously-unknown person simply announcing "I register", in which case we know (barring perjury) that e is distinct from all other persons previously referenced by the gamestate.