rod03801
The chess rules include one for draw situations.
Why would it be any less necessary for any other game that could potentially go on and on?
Fencer responded to my message to him and apparently doesn't think such a rule is necessary for Espionage.
If a rule doesn't exist prior to such a situation to cover it, enforcing a rule that doesn't exist or one made retroactively would be unfair to the other player. Rules themselves drive strategy and tactics. They must be clear before the situation arises or can apply only to games started after the rule is added except by agreement of both players.
Existing rules don't require agreement to be enforced even if program quirks allow them to be broken.