How to Combine Google Search, Google Maps, and Custom Functions in a Single Gemini API Call With Context Circulation, Parallel Tool IDs, and Multi-Step Agentic Chains

MarkTechPost / 4/8/2026

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Key Points

The article is a tutorial describing how to use newly announced Gemini API tooling to combine built-in Google Search and Google Maps tools with custom function calls within a single API request.
It presents five escalating demos that show how to orchestrate tool usage effectively, including “context circulation” to keep relevant information flowing across steps.
The tutorial covers “parallel tool IDs,” enabling multiple tool calls to run in parallel within the same overall request workflow.
It also demonstrates “multi-step agentic chains,” illustrating how the model can execute sequences of tool interactions to complete more complex tasks.
Overall, the post focuses on practical implementation patterns for building agentic applications that integrate search, mapping, and custom logic via the Gemini API.

In this tutorial, we explore the latest Gemini API tooling updates Google announced in March 2026, specifically the ability to combine built-in tools like Google Search and Google Maps with custom function calls in a single API request. We walk through five hands-on demos that progressively build on each other, starting with the core tool […]

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