We tried creating a trigger from terminal and listing it. Calling trigger/create showed it was correctly created but after calling trigger/list, its empty.
I don't believe there is an API method that will currently return triggers created by a specific user. I'll double-check and make sure that's accurate. If not, we can talk about adding that feature.
In the meantime, you might want to just specify a layer when you're creating your triggers. Then you can call the trigger/list API method with the layer_id to get a list of all triggers on that layer.