September 2025 monthly summary: Delivered foundational features across Python and Java ADK repos with a focus on clarity, tooling reliability, and extensibility. In Shubhamsaboo/adk-python, clarified after_agent_callback semantics and performed internal tooling cleanup to standardize copybara markers, reducing confusion in event history and improving build annotations. In google/adk-java, established the ADK Plugin Framework Foundation by introducing a base plugin class with lifecycle hooks and callback interfaces, enabling consistent logging, monitoring, and customization of agent, tool, and model behaviors. These efforts deliver immediate business value by improving user understanding, improving tooling consistency, and enabling scalable plugin customization, setting the stage for future enhancements.