Right click detection

I'm trying to make an ability with an item and its not working, whats wrong with this code?
{     "criteria": { "use_item": {         "trigger": "minecraft:consume_item",         "conditions": { "item": { "predicates": {             "minecraft:custom_data": {"vital_shard":true}         }}}     }},     "rewards": { "function": "spells:weapons/use_vital_shard" } }