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 AutoGen 5 tools — connect in under 2 minutes

Name: Nominatim
Availability: InStock
Author: Vinkius

microsoft.github.io/autogen/docs/tools/mcp-tools

Built by Vinkius GDPR 5 Tools Framework

Microsoft AutoGen enables multi-agent conversations where agents negotiate, delegate, and execute tasks collaboratively. Add Nominatim as an MCP tool provider through the Vinkius and every agent in the group can access live data and take action.

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

import asyncio
from autogen_agentchat.agents import AssistantAgent
from autogen_ext.tools.mcp import McpWorkbench

async def main():
    # Your Vinkius token — get it at cloud.vinkius.com
    async with McpWorkbench(
        server_params={"url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"},
        transport="streamable_http",
    ) as workbench:
        tools = await workbench.list_tools()
        agent = AssistantAgent(
            name="nominatim_agent",
            tools=tools,
            system_message=(
                "You help users with Nominatim. "
                "5 tools available."
            ),
        )
        print(f"Agent ready with {len(tools)} tools")

asyncio.run(main())

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* 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.

AutoGen enables multi-agent conversations where agents negotiate, delegate, and collaboratively use Nominatim tools. Connect 5 tools through the Vinkius and assign role-based access — a data analyst queries while a reviewer validates, with optional human-in-the-loop approval for sensitive operations.

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 AutoGen 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 AutoGen via MCP

Follow these steps to integrate the Nominatim MCP Server with AutoGen.

Install AutoGen

Run pip install "autogen-ext[mcp]"

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token

Integrate into workflow

Use the agent in your AutoGen multi-agent orchestration

Explore tools

The workbench discovers 5 tools from Nominatim automatically

Why Use AutoGen with the Nominatim MCP Server

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

Multi-agent conversations: multiple AutoGen agents discuss, delegate, and collaboratively use Nominatim tools to solve complex tasks

Role-based architecture lets you assign Nominatim tool access to specific agents — a data analyst queries while a reviewer validates

Human-in-the-loop support: agents can pause for human approval before executing sensitive Nominatim tool calls

Code execution sandbox: AutoGen agents can write and run code that processes Nominatim tool responses in an isolated environment

Nominatim + AutoGen Use Cases

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

Collaborative analysis: one agent queries Nominatim while another validates results and a third generates the final report

Automated review pipelines: a researcher agent fetches data from Nominatim, a critic agent evaluates quality, and a writer produces the output

Interactive planning: agents negotiate task allocation using Nominatim data to make informed decisions about resource distribution

Code generation with live data: an AutoGen coder agent writes scripts that process Nominatim responses in a sandboxed execution environment

Nominatim MCP Tools for AutoGen (5)

These 5 tools become available when you connect Nominatim to AutoGen 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 AutoGen

Ready-to-use prompts you can give your AutoGen 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 AutoGen

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

McpWorkbench not found

Install: pip install "autogen-ext[mcp]"

Nominatim + AutoGen FAQ

Common questions about integrating Nominatim MCP Server with AutoGen.

How does AutoGen connect to MCP servers?

Create an MCP tool adapter and assign it to one or more agents in the group chat. AutoGen agents can then call Nominatim tools during their conversation turns.

Can different agents have different MCP tool access?

Yes. AutoGen's role-based architecture lets you assign specific MCP tools to specific agents, so a querying agent has different capabilities than a reviewing agent.