Announcing Genkit Middleware: Intercept, extend, and harden your agentic apps

Genkit, Google's open-source framework for building AI-powered and agentic applications, now ships a composable middleware system for TypeScript, Go, and Dart (Python coming soon). Middleware hooks attach at three layers of the tool execution loop: Generate, Model, and Tool. Pre-built middleware covers retries with exponential backoff, model fallbacks to alternative providers, tool approval gates for human-in-the-loop workflows, skill injection from SKILL.md files, and scoped filesystem access. Custom middleware follows a simple name-plus-factory contract, and multiple middleware can be stacked in explicit order. A content filter example demonstrates how to enforce business rules deterministically in ~20 lines of Go code. The Genkit Developer UI supports inspecting and tracing middleware execution.