Genkit is Google's open-source framework for building AI-powered and agentic applications across TypeScript, Go, Python preview, and Dart preview. The reason it matters in 2026 is not just "another agent SDK." It sits close to Firebase, Google Cloud, Cloud Run, Gemini, Vertex AI, and the MCP tooling wave that is turning agent systems into callable infrastructure. Effloow Lab ran a local sandbox PoC for the TypeScript MCP path on 2026-05-27. The result: the current genkit and @genkit-ai/mcp packages installed, TypeScript compiled, a Genkit-defined tool was exposed through MCP over stdio, and a real MCP client discovered and called it. The full evidence note is in data/lab-runs/google-genkit-2-0-firebase-ai-developer-guide-2026.md . This article keeps the evidence line strict. We verified the local MCP plugin path. We did not deploy to Cloud Run, configure Firebase Monitoring, create a Cloud Trace screenshot, or call Gemini.…