Google ADK
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Open-source, code-first toolkit from Google for building, evaluating, and deploying AI agents.
A code-first framework (primary Python implementation, with Go and Java available) for defining agents and multi-agent systems programmatically rather than through visual builders. Supports both deterministic workflow agents and model-driven dynamic routing, with a built-in tool ecosystem and evaluation tooling. Apache-2.0 licensed and integrates with Google Cloud Vertex AI Agent Engine for managed deployment.
Strengths
- Code-first design with explicit control over orchestration and tools
- Native multi-agent composition and delegation
- Built-in evaluation and local dev CLI (adk run, adk web)
- Backed by Google with paths to managed Vertex AI deployment
Tradeoffs
- Newer framework with a smaller community than longer-established options
- Strongest ergonomics within the Google/Gemini and Cloud ecosystem