I always thought the Cliche list gave off the wrong impression somewhat. I like this.
This is much clearer than the other one.
But I'm sad… No Slenderman…
If your SCP is otherwise uncontainable, it’s overpowered…
I'd like to argue this point. Uncontainable SCPs can work without being overpowered. Many of these have containment procedures that basically follow 'track it, suppress info' tactics because the SCP object is uncontainable. They do work.
Living the dream, or dreaming the life?
Soulless already covered Uncontainable, so I'll just add that there's a huge difference between Uncontainable and Uncontained. There's nothing wrong with an SCP the Foundation hasn't managed to contain yet, so long as it's clear there's still the effort to find a way.
On the note of pretty pplz, and catering to their whim: I see a tendency to go the other way, and that's just as big a mistake. If a humanoid SCP asks for a set of books to pass the time, and they've been otherwise behaving themselves, there's no reason not to provide it to them. Rewarding good behavior gives them an incentive to cooperate, as well as something for the Foundation to take away. Generally, ask yourself: Could someone in a maximum security prison reasonably expect to get it? Then there's no reason to deny it to a humanoid SCP. The only times to refuse such a request is when it takes up excessive resources, breaches security in some fashion, or the SCP in question has been uncooperative.
Finally, Spherical and Cubical objects: Please note the difference between something that's a sphere or a cube because the author couldn't think of an item, and something that's a sphere or a cube because that's what that object would reasonably be expected to be. If an SCP is a basketball, then it's going to be a sphere. If it's a six-sided die, it's going to be a cube. Similarly, SCP-1947 is a sphere because a space probe would reasonably be a sphere. Generally, if there's more to the description beyond sphere or cube of X substance (or, god help us all, of [DATA EXPUNGED]), it's probably all right.
These are some of the biggest misunderstandings I see when people attempt to use the list of Cliches, and I think it would be helpful if your guide addressed them. That being said, good job in working to clarify the Cliches list and make it more useful.
Taking something from another medium and “SCPifying” it without adding a major twist never goes over well (not even as a –J).
There's -J articles for "I Can't Believe It's Not Butter" and the Kool Aid man.
There's a difference between direct ports and parodies.
Please please please add "This not a checklist of things to try to add altogether and make into one SCP." I know that hasn't happened in a while but it seems like whenever the list got updated, there would be another batch of all the bad cliches at once.