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Haran Rajkumar cc444b6cbf docs(samples): add ManagedAgent remote MCP (Maps Grounding Lite) sample

Add a runnable sample wiring `ManagedAgent` to the Maps Grounding Lite MCP
server via `RemoteMcpServer`, with a `header_provider` callback that reads
`GOOGLE_MAPS_API_KEY` and sends it as the `X-Goog-Api-Key` header. Demonstrates
server-side remote MCP execution with runtime header minting.

Co-authored-by: Haran Rajkumar <haranrk@google.com>
PiperOrigin-RevId: 947137422

2026-07-13 11:07:40 -07:00

2.3 KiB

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Managed Agent - Remote MCP (Maps Grounding Lite)

Overview

This sample runs a ManagedAgent wired to a remote MCP server: Google Maps Platform Grounding Lite (https://mapstools.mtls.googleapis.com/mcp). The MCP server is executed server-side. ManagedAgent forwards the server URL and auth headers to the Managed Agents API, and the backend opens the MCP session and calls the Maps tools (search_places, lookup_weather, compute_routes).

Unlike LlmAgent's McpToolset, which opens the MCP session and runs tools client-side, ADK never connects to the MCP server here. Authentication uses a header_provider callback that returns the X-Goog-Api-Key header at runtime from the GOOGLE_MAPS_API_KEY environment variable, using the same callback contract as LlmAgent's McpToolset.header_provider.

Setup

Enable the Maps Grounding Lite service on your Google Cloud project and obtain an API key (see https://developers.google.com/maps/ai/grounding-lite). For testing you may use the Maps Demo Key.
Set the key in your environment (or a .env in this directory):
```
export GOOGLE_MAPS_API_KEY="YOUR_MAPS_API_KEY"
```
Ensure Managed Agents / interactions auth (ADC) is configured, as with the other managed_agent samples.

Note: Maps Grounding Lite may only be used with an LLM that complies with the Google Maps Platform Terms of Service (no training or caching of Maps content). The managed-agent backend model is the LLM in this path.

Sample Inputs

Find a few coffee shops near Golden Gate Park.

The backend calls the search_places MCP tool and grounds the answer in Maps results.
What's the weather in San Francisco tomorrow?

A follow-up turn that reuses the previous interaction, calling the lookup_weather MCP tool.

Graph

graph TD
    ManagedAgent[managed_maps_agent] -->|calls| Maps(maps_grounding_lite)

How To

Create the agent: instantiate ManagedAgent with an agent_id and a RemoteMcpServer in tools.
Declare the MCP server: RemoteMcpServer(name=..., url=..., header_provider=...). Only remote (HTTP/streamable) MCP servers are supported, and execution is server-side.
Mint auth at runtime: the header_provider callback runs during resolution each turn and returns the headers sent to the MCP server, here {'X-Goog-Api-Key': <GOOGLE_MAPS_API_KEY>}.

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