Google ADK 2.0 vs Libretto

Google's Agent Development Kit (ADK) just hit two major milestones simultaneously: ADK Python 2.0 Beta with workflows and agent teams, and ADK TypeScript 1.0 reaching stable release. This open-source framework is Google's answer to LangChain and CrewAI — a code-first toolkit for building production-grade AI agents that are testable, versionable, and deployable anywhere. What separates ADK from the competition is its context management philosophy: it treats sessions, memory, tool outputs, and artifacts like source code, assembling structured context where "every token earns its place." The 2.0 beta introduces graph-based workflows and collaborative multi-agent systems, letting developers compose teams of specialized agents into complex hierarchies. It's model-agnostic despite being optimized for Gemini, and supports MCP natively. Deployment is a first-class citizen — native integrations with Cloud Run, GKE, and Vertex AI Agent Engine, plus Google's new Agents CLI for scaffolding, eval, and deploy in one command. With Apache 2.0 licensing and a bi-weekly release cadence, this is shaping up as the enterprise-grade foundation serious agent builders have been waiting for.

Libretto is an open-source browser automation toolkit built by Saffron Health to solve a critical problem with AI-driven web agents: non-determinism. Standard agent-controlled browsers using Playwright or Puppeteer routinely fail 20-30% of the time on production workflows because they rely on LLM judgment for timing and element selection. Libretto replaces that with a record-replay system that captures precise interaction timing and DOM fingerprints, achieving a reported 95% success rate on identical workflows. The library works by recording a "golden path" of a browser session — capturing not just actions but the exact CSS selectors, visual context, and timing windows during which those actions are valid. On replay, it verifies each step against expected page state before proceeding, and falls back to an LLM-assisted recovery mode when pages drift (e.g., after a UI update). Saffron Health built it to maintain integrations with EHR portals that change frequently and where failure has compliance consequences. Saffron open-sourced Libretto after using it internally for 18 months across 40+ healthcare software integrations. The HN thread highlighted the appeal for fintech, legal, and healthcare automation where reliability, not just capability, is the product. The toolkit targets TypeScript/Node.js environments and integrates cleanly with existing Playwright infrastructure.