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The Agent Development Kit (ADK) & A2A

🤖 Vertex AI Agent Builder 20m 350 BASE XP⌨ HANDS-ON LAB

Code-First Agent Workflows

As of June 2026, the Agent Development Kit (ADK v1.0) is the recommended way to build code-first, deterministic, and autonomous workflows in Google Cloud. It fully replaces the deprecated Vertex AI Extensions.

The ADK includes native support for the Agent-to-Agent (A2A) protocol, allowing your Vertex agents to securely discover and delegate tasks to external agents across different platforms using standardized Agent Cards.

The Interactions API

The new Interactions API (GA June 2026) provides a unified interface for managing agent session state, long-term memory, and asynchronous human-in-the-loop (HITL) handoffs.

⌨ HANDS-ON LABBuild & Run an ADK Agent
⭐ +200 XP

Google's Agent Development Kit is the code-first way to build agents on Vertex. Install it, run your agent in the CLI, then open the visual dev UI.

1Install the ADK Python package with pip.
2Run your agent interactively in the terminal with the adk CLI (agent folder: my_agent).
3Launch the ADK web dev UI to debug your agent visually.
lab-sandbox — simulated environment
INFINITY LAB SANDBOX v2.6 — simulated shell
Type the command for the current objective. Helpers: "hint", "solution", "clear".
$
OBJECTIVE 1 / 3 — type "hint" if stuck
SYNAPSE VERIFICATION
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What is the recommended framework for building code-first agent workflows in Vertex AI as of 2026?
Vertex AI Extensions
LangChain
Agent Development Kit (ADK)
Dialogflow CX
The Agent Development Kit (ADK) & A2A Tutorial | Vertex AI Agent Builder — Vertex AI Academy