Google releases ADK for Kotlin 1.0 with on-device agents for Android

Google has released ADK for Kotlin 1.0, the general-availability version of its Agent Development Kit for Kotlin, Java and Android. The kit is built on Kotlin Multiplatform and has full feature parity with ADK 1.0 Core, according to Google. It adds a set of Android extensions for agents that run on the device.

The LiteRT-LM module runs open models such as Gemma on the device with tool calling, on Android and on the JVM, and needs JDK 21 or newer according to the project README. A separate ML Kit module runs the built-in Gemini Nano model through the ML Kit GenAI Prompt API. It is Android-only, ships as a 1.0.0-beta and does not support tool calling yet. The documentation says agents can run without an API key and without a network connection at inference time, and developers can combine on-device and cloud models in one multi-agent system, with cloud Gemini models reached through Firebase AI Logic.

Further Android modules store chat sessions in a local Room database, keep long-term memory in an on-device AppSearch index and save agent files in app-private storage. Skills, which are bundles of domain-specific prompts and tools, can ship inside the APK’s assets folder. Tools are declared with @Tool and @Param annotations, and a Kotlin Symbol Processing step generates their schemas at compile time with no runtime reflection.

ADK for Kotlin is available under the Apache 2.0 license on GitHub, and the documentation covers setup. The repository includes runnable examples, among them a Java interoperability sample.