Do I need an API key?

No! Nominatim is completely free and requires no authentication. It's powered by the OpenStreetMap community. Just subscribe and start searching. Rate limit is 1 request per second.

How accurate is the geocoding?

Nominatim uses OpenStreetMap data, which is crowd-sourced and varies by region. Urban areas typically have very accurate results. Use addressdetails=1 to get structured address components and namedetails=1 for multi-language names.

Can I convert coordinates to an address?

Yes! Use reverse_geocode with latitude and longitude. Returns the nearest address with street name, house number, city, state, postal code and country. Supports different zoom levels for varying detail granularity.

What is an OSM ID and how do I use it?

OSM IDs are unique identifiers for OpenStreetMap objects: N for nodes (points), W for ways (lines/areas), R for relations (groups). Use lookup_osm with IDs like 'W123456' or 'N987654'. Use get_details for comprehensive info on a single object.

Nominatim MCP Server for Google ADK 5 tools — connect in under 2 minutes

Name: Nominatim
Availability: InStock
Author: Vinkius

google.github.io/adk-docs/tools/mcp-tools

Built by Vinkius GDPR 5 Tools SDK

Google Agent Development Kit (ADK) is Google's framework for building production AI agents. Add Nominatim as an MCP tool provider through the Vinkius and your ADK agents can call every tool with full schema introspection.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

python

from google.adk.agents import Agent
from google.adk.tools.mcp_tool import McpToolset
from google.adk.tools.mcp_tool.mcp_session_manager import (
    StreamableHTTPConnectionParams,
)

# Your Vinkius token — get it at cloud.vinkius.com
mcp_tools = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    )
)

agent = Agent(
    model="gemini-2.5-pro",
    name="nominatim_agent",
    instruction=(
        "You help users interact with Nominatim "
        "using 5 available tools."
    ),
    tools=[mcp_tools],
)

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Stream every event to Splunk, Datadog, or your own webhook in real-time

* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About Nominatim MCP Server

Connect to Nominatim and search the world's most comprehensive open-source geographic database through natural conversation — no API key needed.

Google ADK natively supports Nominatim as an MCP tool provider — declare the Vinkius Edge URL and the framework handles discovery, validation, and execution automatically. Combine 5 tools with Gemini's long-context reasoning for complex multi-tool workflows, with production-ready session management and evaluation built in.

What you can do

Address Search — Find any place by name, address or type of place (restaurants, schools, hospitals)
Reverse Geocoding — Convert GPS coordinates to human-readable addresses
OSM Lookup — Look up detailed info for any OpenStreetMap object by its ID
Structured Addresses — Get detailed address components (street, city, state, postal code, country)
Multi-language Names — Retrieve place names in different languages
Bounding Boxes — Get geographic boundaries for cities, countries and regions

The Nominatim MCP Server exposes 5 tools through the Vinkius. Connect it to Google ADK in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect Nominatim to Google ADK via MCP

Follow these steps to integrate the Nominatim MCP Server with Google ADK.

Install Google ADK

Run pip install google-adk

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token

Create the agent

Save the code above and integrate into your ADK workflow

Explore tools

The agent will discover 5 tools from Nominatim via MCP

Why Use Google ADK with the Nominatim MCP Server

Google ADK provides unique advantages when paired with Nominatim through the Model Context Protocol.

Google ADK natively supports MCP tool servers — declare a tool provider and the framework handles discovery, validation, and execution

Built on Gemini models, ADK provides long-context reasoning ideal for complex multi-tool workflows with Nominatim

Production-ready features like session management, evaluation, and deployment come built-in — not bolted on

Seamless integration with Google Cloud services means you can combine Nominatim tools with BigQuery, Vertex AI, and Cloud Functions

Nominatim + Google ADK Use Cases

Practical scenarios where Google ADK combined with the Nominatim MCP Server delivers measurable value.

Enterprise data agents: ADK agents query Nominatim and cross-reference results with internal databases for comprehensive analysis

Multi-modal workflows: combine Nominatim tool responses with Gemini's vision and language capabilities in a single agent

Automated compliance checks: schedule ADK agents to query Nominatim regularly and flag policy violations or configuration drift

Internal tool platforms: build self-service agent platforms where teams connect their own MCP servers including Nominatim

Nominatim MCP Tools for Google ADK (5)

These 5 tools become available when you connect Nominatim to Google ADK via MCP:

get_details

Returns the object's full name, display name, place rank, importance score, bounding box, parent place hierarchy, linked Wikipedia/Wikidata articles and optional extratags. OSM type: N (node), W (way), R (relation). Get detailed info for an OSM object

get_status

Returns status message and response latency. Useful for verifying the service is operational before making other requests. Get Nominatim server status

lookup_osm

IDs are formatted as "type{id}" where type is N (node), W (way) or R (relation). Multiple IDs are comma-separated. Returns the object's display name, coordinates, bounding box and properties. Look up OSM objects by ID

reverse_geocode

Returns the nearest address, city, state, country and other location details. Supports different zoom levels for varying detail granularity. Convert coordinates to an address

search

Returns results with coordinates, bounding box, display name, address components and OSM type/id. Supports structured searches with country codes and viewbox for region prioritization. Rate limited to 1 request/second. Search for places by name or address

Example Prompts for Nominatim in Google ADK

Ready-to-use prompts you can give your Google ADK agent to start working with Nominatim immediately.

"Find the coordinates for the Eiffel Tower."

"What address is at coordinates 40.7128, -74.0060?"

"Search for 'Central Park' and show me its bounding box."

Troubleshooting Nominatim MCP Server with Google ADK

Common issues when connecting Nominatim to Google ADK through the Vinkius, and how to resolve them.

McpToolset not found

Update: pip install --upgrade google-adk

Nominatim + Google ADK FAQ

Common questions about integrating Nominatim MCP Server with Google ADK.

How does Google ADK connect to MCP servers?

Import the MCP toolset class and pass the server URL. ADK discovers and registers all tools automatically, making them available to your agent's tool-use loop.

Can ADK agents use multiple MCP servers?

Yes. Declare multiple MCP tool providers in your agent configuration. ADK merges all tool schemas and the agent can call tools from any server in a single turn.

Which Gemini models work best with MCP tools?

Gemini 2.0 Flash and Pro models both support function calling required for MCP tools. Flash is recommended for latency-sensitive use cases, Pro for complex reasoning.