Why it matters

Gemini integration is the primary ADK Java path. Understanding shapes model configuration.

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The architecture

Vertex AI: managed Gemini via Google Cloud. ADC auth.

Gemini API: direct API for lighter setup.

Gemini integration optionsVertex AImanaged, enterpriseGemini APIdirect APIModel configin LlmAgentVertex AI adds enterprise features; Gemini API for simpler setups
Integration paths.
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How it works end to end

Model selection: gemini-2.0-flash, gemini-2.5-pro, etc. Each has different capabilities and cost.

Function calling: native structured tool call.

Streaming: native.

Multimodal: images, audio, video inputs.