Object Classes

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All anomalous objects, entities, and phenomena requiring Special Containment Procedures are assigned an Object Class. An Object Class is a part of the standard SCP template and serves as a rough indicator for how difficult an object is to contain. Object Classes are for the purposes of identifying containment needs, research priority, budgeting, and other considerations. An SCP's Object Class is determined by a number of factors, but the most important factors are the difficulty and the purpose of its containment.

Primary Classes
These five classes denote almost every SCP.

Safe
Safe-class SCPs are anomalies that are easily and safely contained. This is often due to the fact that the Foundation has researched the SCP well enough that containment does not require significant resources or that the anomalies require a specific and conscious activation or trigger. Classifying an SCP as Safe, however, does not mean that handling or activating it does not pose a threat.

For a list of Safe SCPs click here

Euclid
Euclid-class SCPs are anomalies that require more resources to contain completely or where containment isn't always reliable. Usually, this is because the SCP is insufficiently understood or inherently unpredictable. Euclid is the Object Class with the greatest scope, and it's usually a safe bet that an SCP will be this class if it doesn't easily fall into any of the other standard Object Classes.

To note, any SCP that's autonomous, sentient and/or sapient is generally classified as Euclid, due to the inherent unpredictability of an object that can act or think on its own.

For a list of Euclid SCPs click here

Keter
Keter-class SCPs are anomalies that are exceedingly difficult to contain consistently or reliably, with containment procedures often being extensive and complex. The Foundation often can't contain these SCPs well due to not having a solid understanding of the anomaly, or lacking the technology to properly contain or counter it. A Keter SCP does not mean the SCP is dangerous, just that it is simply very difficult or costly to contain.

For a list of Keter SCPs click here

Thaumiel
Thaumiel-class SCPs are anomalies that the Foundation specifically uses to contain other SCPs. Even the mere existence of Thaumiel-class objects is classified at the highest levels of the Foundation and their locations, functions, and current status are known to few Foundation personnel outside of the O5 Council.

For a list of Thaumiel class click here

Neutralized
Neutralized SCPs are anomalies that are no longer anomalous, either through having been intentionally or accidentally destroyed, or disabled.

For a list of Neutralized class click here

Explained
Explained SCPs are common articles about anomalies that are completely and fully understood to the point where their effects are now explainable by mainstream science or phenomena that have been debunked or falsely mistaken as an anomaly.

For a list of Explained class click here

Esoteric/Narrative Classes
Esoteric Object Classes, also occasionally referred to as Narrative classes, are Object classes that do not fall into any of the above sections. They are generally only used once and are created to further the narrative in a particular SCP. It is highly recommended that SCPs use one of the standard Object Classes listed here. While some authors choose to introduce exceptions to these rules, they are only very rarely done and need to justify their existence and placement. Many site members will downvote for non-standard Object Classes if used without merit.

For a list of Esoteric class click here

Decommissioned
Decommissioned SCPs are an Object Class that was used by senior staff in the past to not only delete unwanted articles but place them in a sort of "Wall of Shame" to serve as examples of what not to do. This Object Class is  not  used anymore.

Locked Box Test
Note that as a special consideration, something that is autonomous, alive, and/or sapient is almost always  at least  Euclid-class. That is, if you lock a living thing in a box and forget about it, it will eventually suffocate or starve to death, and that's not a good outcome. Something that is intelligent could also end up being smart enough to outwit its containment procedures and/or stop cooperating with the Foundation's attempts to contain it, making it more dangerous than it otherwise might be.
 * If you lock it in a box, leave it alone, and nothing bad will happen, then it's probably  Safe.
 * If you lock it in a box, leave it alone, and you're not entirely sure what will happen, then it's probably  Euclid.
 * If you lock it in a box, leave it alone, and it easily escapes, then it's probably  Keter.
 * If it  is  the box, then it's probably  Thaumiel.