For the record: We are on the same side. I am a fan of your characters. (You should be a fan of each others' characters too.)
I am
not a fan of 'gotchas!', we can assume your characters are competent at what they do and don't make silly mistakes, like walking into electrified water without checking the power is off (presumably the information that 'The authorities have shut off the water and electricity' [
ref] was part of your briefing or you asked, or something, but you know this fact).
Again, this is not really an 'OSR game', where I hear some GMs will gleefully electrocute you for not saying clearly that you checked that particular aspect of the scene, or not mention a vital clue because you failed to say that you 'looked under the mattress' while 'searching the room for clues' (I hate 'clues' anyway). Assume you will see what you would logically see if you looked in a room, if you spend enough time you will find most things that could be found and if you need to make a roll to find something especially hidden I will call for it. If, for instance, you have have lockpicks and some training, most rolls for opening a lock are about the
time it takes, and if you can get it done before something else happens, and (mostly) not about 'can you do it'.
You don't 'roll to Notice', but I might ask you to roll to see if you
fail to notice something (in time), but, more likely, not noticing something that comes back to bite you later may be the consequence of a (seemingly unrelated) 6-.
@tibbius: If this [
ref] is meant to establish
Arthur as cautious in his approaches to things, then brilliant, but mechanically we don't need to check every step of the way.
This lack of need for mechanics based checking for such things is even more elevated if you establish in the fiction that a character has a tendency to be cautious. We will then always assume they are being cautious unless they say otherwise (though we may forget and need reminding:). This can be a downside too, when we assume they are inclined to being cautious in a situation where boldness would be a benefit, but, again, we are fans of the characters and only focus on their weaknesses where it is good for their story.