My group has a question on the interaction between Admiral Agate & Expert Shield Techs.

To me it seems like you can use Agate's ability to discard a redirect token for its normal effect AND spend a redirect for the Expert Shield Techs effect on the same attack. I think I can even do both on the same token (spend then discard).

I think this wouldn't violate any rules:

Rules Reference Guide - pg 4

"The defender cannot spend more than 1 defense token of each type during an attack" - Agate's ability is a discard not a spend

" A defense token cannot be spent more than one during an attack" - Again, Agate's ability is a discard not a spend

Admiral Agate's Ability

"You cannot resolve the effect of each type of defense token more than once per attack" - Expert Shield Techs does not "resolve the effect" of the redirect defense token. EST ends with "instead of resolving that token's effect."

Expert Shield Techs

"While defending, during the Spend Defense Token step, when you spend a [redirect] defense token you may reduce the total damage from the attack by 1 instead of resolving that token's effect."

Am I making any mistakes here?

Nope, no mistakes. You can do both, similar to how you can spend a token on Admonition and then discard that same token for Admonitions effect. It’s pretty handy!

The Flipside of that is, that you Cannot use an Agate Discard to Fuel an Expert Shield Tech Redirect. Ever.

Because Expert Shield Techs require a spending , not a spend or discard .

Thanks! I will keep that EST restriction in mind.