CobraCore is a class within Cobra's standard library (known as "Cobra.Core"). It is immediately accessible in Cobra code and contains numerous shared methods for various utility functions.

You can browse the source online to see the method signatures along with their doc strings, contracts and unit tests: http://cobra-language.com/trac/cobra/browser/cobra/trunk/Source/Cobra.Core/CobraCore.cobra

See also: LibraryTopics, EncodeAndDecode