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The only list of Google Wave Robot capabilities is contained in the API reference documentation of the enum EventType, but unfortunately does not contain a description when the events are triggered. Here is a documented list of what I’ve figured out so far (needs to be completed in the future):

• WAVELET_BLIP_CREATED
  Could not produce this event yet.
• WAVELET_BLIP_REMOVED
  Could not produce this event yet.
• WAVELET_PARTICIPANTS_CHANGED
  Participants have been added to and/or removed from a Wave. Access the new/removed participants via Event#getAddedParticipants() / Event#getRemovedParticipants()
• WAVELET_SELF_ADDED
  The robot has been added to a wave.
• WAVELET_SELF_REMOVED
  The robot has been removed from a wave.
• WAVELET_TIMESTAMP_CHANGED
  The modification timestamp of a wave has changed.
• WAVELET_TITLE_CHANGED
  The title of the wave has changed.
• WAVELET_VERSION_CHANGED
  Haven’t figured out what version means exactly.
• BLIP_CONTRIBUTORS_CHANGED
  The contributors for a blip have changed, i.e. added or removed.
• BLIP_DELETED
  A blip was removed.
• BLIP_SUBMITTED
  A new blip was created.
• BLIP_TIMESTAMP_CHANGED
  The timestamp of a blip has changed.
• BLIP_VERSION_CHANGED
  Haven’t figured out what version means exactly.
• DOCUMENT_CHANGED
  The content of a blip was changed.
• FORM_BUTTON_CLICKED
  Haven’t figured out yet what this really means.

As one can see, the description is not complete yet. Feel free to help me out in the comments ;)