AGTBRIEF
Google's Agent Development Kit (ADK), a toolkit for building AI agents, hits 1.
Google's Agent Development Kit (ADK) for Kotlin hit 1.0 general availability on Sept. 9, 2026, with Google claiming full feature parity with its Python and Java counterparts. ADK is a toolkit for assembling AI "agents" (software that takes multi-step actions on a user's behalf) in Kotlin, a programming language widely used for Android and server apps.
A Kotlin Multiplatform core lets the same source target Android phones and Kotlin/JVM servers, with first-party Java interop so existing Java apps can call ADK agents directly.
On Android, LiteRT-LM and ML Kit, both still tagged beta, let agents run on the phone rather than round-tripping to the cloud. Firebase AI Logic and Vertex AI handle cases where the model is too large or the data should not leave the device.
Multi-agent features (hierarchical delegation, context compaction, human-in-the-loop confirmation, and long-running tools via @Tool and @Param) match the Python and Java releases per Google.
The source basis is a single Google Developers Blog post plus the GitHub repository and CHANGELOG. "Production-ready" and "feature parity" are vendor framing, not independently verified.