android__skills/device-ai/appfunctions/references/context.md

Defines the ubiquitous language for the Android AppFunctions skill suite.

Architecture and versioning

AppFunctionServiceEntryPoint API: This compile-time AppFunctions architecture was introduced in version 1.0.0-alpha10. You annotate a wrapper service extending AppFunctionService with @AppFunctionServiceEntryPoint. KSP then generates XML metadata and routes services at compile time.

Legacy manual provider API: This deprecated AppFunctions architecture applies to version 1.0.0-alpha09 and earlier. Applications implement AppFunctionConfiguration.Provider on the Application class. Methods require AppFunctionContext as the first parameter. Projects depend on a standalone appfunctions-service library.

Patterns

Service entry point pattern: Version 1.0.0-alpha10 introduced this architectural pattern. You declare @AppFunction methods directly inside an abstract class extending AppFunctionService. This class uses @AppFunctionServiceEntryPoint and @AndroidEntryPoint annotations. These annotations let you inject data sources or repositories directly, without an intermediate business logic delegation layer.