Google Cloud has published a step-by-step guide on building an AI agent for trip planning with Gemini 1.5 Pro. This guide focuses on incorporating function calling and grounding, allowing the agent to connect to external data sources like event APIs and deliver personalized travel recommendations in real-time. The guide covers notebook setup, API key configuration, defining custom functions, declaring the function as a tool, configuring safety settings, starting the chat, building the agent, and testing it. This provides a comprehensive overview of how to leverage Gemini 1.5 Pro for developing AI-powered chatbots for trip planning.