This app was mentioned in 7 comments, with an average of 1.14 upvotes
I used DGT-GTD for a few years. It's decent enough and it integrates well with Toodledo.com. Unfortunately, development appears to have dropped off and it has some screen tearing issues on my non-explodey Note S4.
So, I switched to Ultimate To-Do List. It has a ton of features, but it comes with three predefined feature sets (Simple, Intermediate, and Advanced) plus a means to customize it (Power User). The widget is highly customizable, as well.
I recently tried taskwarrior, but went back to Toodledo/Ultimate To-Do list after about a week because it just works.
Oh maybe I misunderstood! You'd have to scan the tag with the phone, you can't use the watch as it only works for wallet.
Tasker does have plugins to a task management app, this app can use the tasker plugin to create tasks, mark them as complete and perform actions when you complete a task.
There is also this habit tracking app with a tasker plugin - Loop Habit tracker.
It can mark habits as done depending on context. I have a task to track how frequently I go to the gym and it gets ticked when I connect to the gym wifi.
I'm a fan of "Ultimate Todo List" which is extremely customizable. https://play.google.com/store/apps/details?id=com.customsolutions.android.utl