Events

All events fire synchronously on the target player's owner thread. All three cover only the vanilla advancement layer; category-entry unlock, activation, and claim currently publish no public events.

Event	Timing	Cancellable	Mutable field	Cancellation/effect
AdvancementGrantEvent	After validation, before criterion award	Yes	None	Leaves progress untouched and returns a cancelled result.
AdvancementRevokeEvent	After validation, before criterion revocation	Yes	None	Leaves the advancement intact and returns a cancelled result.
AdvancementCompletedEvent	From Bukkit's actual advancement-completion event	No	None	Informational after completion; exposes player, advancement id, and key.

Grant/revoke pre-events cover every EmakiCodex mutation path: public operations, commands, actions, configured triggers, and external trigger providers. The completed event observes every advancement registered by EmakiCodex, including completion caused by another criterion-awarding source. It is not cancellable and cannot undo completion.