Spy no longer on list of options to build?

[beorn]

I built a couple spies, and now would like to add some more. But no city lists spy under units to build.

Is there a limit? A known bug? Other?

Thanks.

 

[Deaga]

There's a non-obvious spy limit, which is raised by some civics. Again, it's obscure which ones raise the limit, as there's no icon or anything informing you of that.
I think one of the buttons on the top right goes to a espionage screen, which displays your cap too. May want to check that.

 

[beorn]

Thanks! I saw nothing about this in the civilopedia and never saw the espionage button. Lots of good things about this game, but it can be tough finding all the rules.

 

[JosephC]

Skimming through the xmls, these are the techs & civics that give you spies

Technologies
Castles (If French)
Computers

Civics
Diplomatic Service
Nationalism
Ideology
Cold War