v2.2.0 — Agent Platform, completed

API-compatible minor release. All 43 crates are on crates.io.

adk-rust = "2.2.0"

Added

Wave 4 platform services complete the Gemini Enterprise Agent Platform consumption path. Every
one is opt-in, composable with any preset, and appended to gemini-agent-platform.

Feature	Crate	What it gives you
vertex-eval	adk-eval	Gen AI Evaluation Service bridge — evaluateInstances and a service-backed judge
vertex-rag	adk-rag	Vertex AI RAG Engine retrieval, plus grounding through Tool::Retrieval
agent-retrieval	adk-rag	Agent Retrieval / Vector Search 2.0 VectorStore with hybrid RRF
vertex-agent-registry	adk-tool, adk-cli	Agent Registry registration, discovery, and AgentSearchTool
vertex-skill-registry	adk-skill, adk-cli	Skill Registry consumption and remote skill loading
vertex-remote-engine	adk-server	RemoteReasoningEngineAgent — call deployed Agent Engine agents as sub-agents
skills-progressive-disclosure	adk-skill	SkillToolset — discover a skill index first, load bodies and resources on demand

Graph workflows gain native tool confirmation pauses.

Fixed

• One invocation now exports as one trace. LlmAgent held a call_llm span guard across its
  generator's suspension points, and Runner instrumented only the construction of the agent
  stream rather than the draining of it, so spans detached from their parents. Both now instrument
  the individual futures. Names, attributes, and durations were always correct — only parentage
  was wrong.
• adk-realtime --features livekit compiles again — livekit-data-stream pinned to =0.1.1,
  since 0.1.2 breaks livekit 0.8.1's own source.
• adk-audio ONNX features compile again — ort pinned to =2.0.0-rc.11, since rc.13 moved
  the CUDA and CoreML execution providers.

Upgrading

No API changes from 2.1.0. Coming from 1.x, see the
migration guide.

Full detail in the CHANGELOG.