Much of Blueprint's features and functionality are implemented by plugins contained in this module.
Each plugin resides in its own subdirectory and provides its own documentation.
The Blueprint User Manual provides a high-level overview of some of the more prominent plugins.
Most plugins make use of a blueprint WiringSpec from the blueprint/pkg/wiring package. See the documentation for that package or from the Blueprint User Manual for details on initializing a wiring spec.
If you want to develop your own plugin, it is not mandatory for the plugin to live in this directory. It can reside in a different repository and module.