knack
Pretty good at computers. He/him.
Great introduction section, looks pretty easy to port to another setting or system (handy if you have an established game to add it to).
The meaning of attuned to bearer's heartbeat (silver keycard) is unclear to me.
I'd definitely raise the alarm much faster after a guard is found knocked out - especially after a potion is administered to wake them up, and they can describe their assailants. IMO that's "page the head of security, ask the watch to be nearby, double-check that your surveillance is working, begin a sweep of the building" territory.
On layout & indexing:
There's a few tables of "thing players might try -> information they can get on a success".
I find the inverse table extremely useful when running a module - a list of all the useful facts/accesses a player could obtain, and all the designed ways for them to get it. Especially useful when figuring out how to nudge a group who have gotten stuck.
Very similar to the Counter column in the "Magical Security Devices".
GM can cross off problems the party has solved - so they can clearly see which ones they haven't solved.