Google Genkit Ships Middleware Layer: Composable Hooks for Agent Retry, Fallback, and Approval Gates

Google Developers Blog·medium signal

Google announced Genkit Middleware on May 14, adding composable hooks that intercept generation calls including the tool execution loop. Pre-built middleware includes automatic retry with exponential backoff and jitter on transient errors (retrying only the model call, not the surrounding tool loop), model fallback that switches providers when quota is exceeded, and tool approval gates for human-in-the-loop workflows. Available in TypeScript, Go, and Dart with Python coming soon. For teams building production agents, this addresses a critical gap between prototype and reliable deployment.