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I'd say the order is reversed: first, the GM rolls truesight's counteract check to determine whether the creature detects you at all through disappearance, as the effect could very well fail. Only if truesight succeeds does hidden mind then need to try to counteract the effect, potentially causing it to fail to detect you. In both instances, if either check goes your way, then truesight will fail to detect you.
I don't think you should be revealing the result of the secret check until all checks around it are completed, though. Hidden mind doesn't work by saying "you spot something with your revelation spell... [*rolls dice*] oh, wait, no you don't", it messes with the spell before that spell can give you information. Thus, it should similarly not matter for this purpose whether your make the secret counteract check first or second. I also don't see why this would even need to be argued in the first place, either, as the creature with truesight here is a NPC under the GM's control.
Thats not what i'm saying though?
Okay, so could you then please clarify what you meant by this?
I just prefer doing it in an order where it does not reveal the result of the secret check and thus would need to roll the second roll regardless if I began with the secret check.
Because if you're not saying that doing the secret check first would reveal the result, what are you saying here, exactly?
I'm saying that it matters when the GM stops rolling dice if the outcome is determined before all checks are complete, A rather common occurance from my own experience and also as was presented in my original example; That you don't need to roll if Hidden Mind is successful.
By ignoring the second check you give away information about the first. Which has implications if the result of that check isn't open information as the player isn't supposed to be aware of the truesight's result.
I think this continues to miss the point, which is that the order in which you do the checks has no bearing on what you're saying. If you don't roll twice in either case, then you're giving away the fact that the creature has failed to detect you. The monster detects you only if truesight's counteract check succeeds and hidden mind's counteract check fails, which requires both checks to be performed regardless of order.
And thus both checks needs to be done regardless of relevance.
I'm confused, who here is claiming otherwise?
Right, but all this ultimately says is that your example is flawed, that your preferences could do with accommodating some exceptions under certain circumstances, and that good sense dictates that in this extremely specific scenario, the better practice would be to roll both checks in secret regardless of outcome, and only at the end of those checks say whether or not the monster detects you.
Independently of this, I do think it is good practice to also follow the order of checks logically, even if it's not of great consequence here: truesight is a counter to disappearance, whereas hidden mind is a counter to truesight. It therefore makes sense to roll the check for the counter only after the effect it's trying to counter has attempted to do its thing, in this case truesight having rolled its counteract check. Once that happens and succeeds, it's up to hidden mind to roll its own counteract check to try once more to make it fail, and because the original check is secret, I'd rule that both checks ought to be rolled in secret and regardless of outcome to not give anything away until the very end.