Building Custom Tools for ADK Agents

Building Custom Tools for Google ADK Agents

Give your AI agent superpowers with custom tools Series Navigation: This is Post 3 of the Google ADK Tutorial Series. ← Previous: LiteLLM Integration: Making Your ADK Agents Model-Agnostic What You’ll Learn By the end of this post, you’ll understand the three types of tools in ADK: Built-in Tools - Pre-built tools like Google Search that provide instant capabilities Custom Function Tools - Your own Python functions that the agent can call Agent as a Tool - Using other agents as callable tools for complex workflows We’ll build a travel assistant agent that demonstrates all three tool types working together. ...

January 21, 2026 · 15 min
LiteLLM and Google ADK

Google ADK + LiteLLM: Build Model-Agnostic Agents (Gemini, OpenAI, Claude)

Switch between OpenAI, Claude, and Gemini with one line of code 📚 Series Navigation: This is Post 2 of the Google ADK Tutorial Series. ← Previous: Introduction to Google ADK What You’ll Learn By the end of this post, you’ll: Understand how LiteLLM works with ADK Configure multiple LLM providers Switch between models without changing code Implement fallback strategies for reliability Optimize costs by choosing the right model for each task Code on GitHub: The complete working example from this post is available at google-adk-samples/model_agnostic_agent ...

January 16, 2026 · 10 min