Terry Ryan from Google walks us through Naval Plan, a real app he built (and actually uses) to plan sailing trips using ADK Go. The app combines agentic research, pulling from old sailing forums and local knowledge, with deterministic API calls for tides, weather, and sunrise/sunset data. We dig into how the agents are architected, the quirks of working with Google Search as a tool in ADK, and Terry's dev workflow using Gemini CLI.

Topics covered:
- Building Naval Plan: an agentic sailing trip planner with ADK Go
- Mixing agentic research with deterministic API tools (tides, weather, sunrise/sunset)
- ADK agent architecture: subagents, tool composition, and the Google Search tool workaround
- Structured JSON output from agents and how to make it reliable
- Dev workflow: Gemini CLI in YOLO mode, git-based rollback, and prompt management
- Using LiteLLM for multi-model support in ADK
- Tool count limits and context window considerations
- Upcoming Temporal + ADK integration

Links mentioned:
- ADK: https://adk.dev
- Naval Plan walkthrough video: https://www.youtube.com/watch?v=kwSVtQ7dziU
- Charm (Go terminal UI libraries): https://charm.sh
- Google Cloud Next (Las Vegas): https://www.googlecloudevents.com/next-vegas

Drop your questions below and let us know how you are building with AI.

---

Temporal is the simple, scalable, open source way to write and run reliable cloud applications. 

Learn more
Blog: https://temporal.io/blog
How Temporal Works: https://temporal.io/how-temporal-works
Community Slack: https://temporal.io/slack

Developer resources
Docs: https://docs.temporal.io
Courses: https://learn.temporal.io/courses
Support forum: https://community.temporal.io

Temporal's platform is a central hub for developers interested in distributed systems, workflow orchestration, and fault-tolerant computing. Through articles, tutorials, and documentation, Temporal offers insights into building resilient and scalable distributed applications. Developers can learn about workflow automation, state management, and handling failure scenarios using Temporal's workflow engine and coordination APIs.

Temporal

A live demo walkthrough of Naval Plan, a sailing trip planning app built with Google's Agent Development Kit (ADK) in Go. The app uses multiple AI agents working in parallel: a voyage agent that researches destination guides via Google Search, and a stop agent that combines deterministic API calls (weather via Open-Meteo, tides via NOAA, sunrise/sunset math, Google Places) with an AI sub-agent for localized points of interest. Key architectural decisions discussed include isolating the Google Search tool into a sub-agent due to a known ADK/Gemini incompatibility, enforcing strict JSON output from agents, and running the web server and agent as separate Go executables for security. The developer's vibe coding workflow using Gemini CLI in YOLO mode with Git as a safety net is also shared. A forthcoming Temporal integration with ADK for durability and automatic retries is briefly mentioned.

Vibe Check: Planning a Sailing Trip with AI Agents | ADK Go in Action