The CAS Extension API provides interfaces and classes to build extensions to CAS such as data source extensions and manipulator extensions. An extension developer packages extensions into a JAR and a CAS application developer installs the JAR and any additional JARs (for third-party dependencies) into the Content Acquisition System. After installation, the extensions are available and configurable using the CAS Console, the CAS Server API, and the CAS Server Command-line Utility.

The CAS Extension API is installed by default as part of the Content Acquisition System.

The components of the CAS Extension API include the following: