For D&D at least.Outside of combat, permissive.
Within combat, restrictive.
Pretty sure there aint. Where is the rule for shield surfing down a staircase? Picking up and spinning a trestle table whist another character swashbuckles on top of it? Pulling down a tapestry on top of a monster? Forming a holy symbol from two candlesticks? Leaping onto the back of a giant monster? Throwing a halfling? There are any number of potential combat actions that are not specifically addressed in the rules of any edition.There is usually a combat rule or structure for everything combat related
Athletics checks are in the rules.Pretty sure there aint. Where is the rule for shield surfing down a staircase? Picking up and spinning a trestle table whist another character swashbuckles on top of it? Pulling down a tapestry on top of a monster? Forming a holy symbol from two candlesticks? Leaping onto the back of a giant monster? Throwing a halfling? There are any number of potential combat actions that are not specifically addressed in the rules of any edition.
He did say combat rule or structure. One example (PF2E) I had was a PC wanted to save someone a minotaur was dropping into a vat of boiling acid. There's no specified action for that, and it wasn't the PC's turn, but you usually have a reaction per turn. I allowed the PC to spend his reaction (and his first action next turn to prevent increased overall movement through reactions) to intercept and save the falling victim.Pretty sure there aint. Where is the rule for shield surfing down a staircase? Picking up and spinning a trestle table whist another character swashbuckles on top of it? Pulling down a tapestry on top of a monster? Forming a holy symbol from two candlesticks? Leaping onto the back of a giant monster? Throwing a halfling? There are any number of potential combat actions that are not specifically addressed in the rules of any edition.
But these things are not given as specific examples of using it. "Restrictive" means that if it's not specifically mentioned in the rules, you can't do it. If you say "okay, make an athletics* check" you are being permissive, even if you set the DC to 35.Athletics checks are in the rules.
Whereas for me, I would classify both of those behaviors--"no, you can't do it, it's not in the rules" and "sure, you can 'do' it, but it's DC 35"--as being restrictive. The latter is just making a pretense of being permissive by pretending to allow things while actually banning them. I don't like either of these behaviors, but I have a special antipathy for the latter, as it is deeply disingenuous.But these things are not given as specific examples of using it. "Restrictive" means that if it's not specifically mentioned in the rules, you can't do it. If you say "okay, make an athletics* check" you are being permissive, even if you set the DC to 35.
*Or other skill. for example, I would ask for a Religion check to make an improvised holy symbol.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.