How to Use the Nominatim MCP in OpenAI Agents SDK

Q: How does an OpenAI Agent use Nominatim to find the coordinates for '1 Infinite Loop, Cupertino'?

Your agent calls the search tool with the address. Nominatim processes the string and returns the corresponding latitude and longitude, which your agent can then use for other tasks.

Q: Can I check if the Nominatim server is online before my OpenAI Agent makes a request?

Yes. Have your agent call the getstatus tool. It returns a simple status message and latency, so you can confirm the service is operational before running a batch of geocoding jobs.

Q: What's the difference between lookuposm and getdetails when using Nominatim with the OpenAI Agents SDK?

lookuposm is for a quick lookup by ID to get basic data like coordinates. getdetails provides a much richer dataset, including parent places and importance scores, for when your agent needs more context.

Build production-grade geographic agents with the OpenAI Agents SDK. Turn addresses into coordinates and back, with built-in safety checks.

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Connect Nominatim MCP to OpenAI Agents SDK

Create your Vinkius account to connect Nominatim to OpenAI Agents SDK and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Nominatim with OpenAI Agents SDK

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Geocode Addresses and Places

The `search` tool turns text queries into geographic coordinates. Your OpenAI Agent can find a specific store's location or geocode a list of customer addresses. Because it's an open service, there's no API key to manage. The OpenAI SDK's guardrails are key here. You can set rules to prevent your agent from running too many `search` queries and hitting the 1 request/second rate limit. It keeps your agent from getting blocked.

Convert Coordinates to Addresses

Use the `reverse_geocode` tool to get the nearest street address from a latitude and longitude. It's perfect for agents that need to identify a location from GPS data or map clicks. With the SDK's tracing, you can see every `reverse_geocode` call in your OpenAI dashboard. This helps you debug why an agent picked one address over another, giving you a clear audit trail for your agent's actions.

Explore OSM Data with Your MCP Server

The `lookup_osm` tool lets your agent fetch raw OpenStreetMap object data using a node, way, or relation ID. For deeper analysis, `get_details` pulls extra info like place hierarchy and importance scores. You can build specialized agents that hand off tasks. One agent could use `search` to find a place's OSM ID, then pass it to another agent that uses `lookup_osm` to get the raw data. The SDK manages the state between them.

Setup guide

Set up Nominatim MCP in OpenAI Agents SDK

Prerequisites

Python 3.10+ installed
openai-agents package (pip install openai-agents)
Active Vinkius subscription with a valid endpoint token

1

Install the SDK

Run pip install openai-agents to install the OpenAI Agents SDK. The MCP integration is built-in — no extra dependencies needed.
2

Connect via SSE transport

Use MCPServerSse with your Vinkius endpoint URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. The SDK auto-discovers all Nominatim tools at runtime.
3

Create your Agent

Pass the MCP to Agent(mcp_servers=[server]). The agent receives Nominatim tools as native definitions — JSON schemas resolve automatically.
4

Run the agent

Call Runner.run(agent, prompt) to execute. The agent invokes the appropriate Nominatim tools and returns structured results. Copy the full example on the right to get started.

agent.py

import asyncio
from agents import Agent, Runner
from agents.mcp import MCPServerSse

async def main():
    async with MCPServerSse(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    ) as server:
        agent = Agent(
            name="Nominatim Agent",
            instructions="You have access to Nominatim tools.",
            mcp_servers=[server],
        )
        result = await Runner.run(agent, "List recent transactions")
        print(result.final_output)

asyncio.run(main())

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Common questions about Nominatim MCP in OpenAI Agents SDK

Your agent calls the `search` tool with the address. Nominatim processes the string and returns the corresponding latitude and longitude, which your agent can then use for other tasks.

Yes. Have your agent call the `get_status` tool. It returns a simple status message and latency, so you can confirm the service is operational before running a batch of geocoding jobs.

`lookup_osm` is for a quick lookup by ID to get basic data like coordinates. `get_details` provides a much richer dataset, including parent places and importance scores, for when your agent needs more context.

You can build a custom guardrail in the OpenAI Agents SDK. This function would track the timestamp of the last call to this MCP Server and enforce a delay to stay under the 1 request/second limit.

Only the specific data needed for the query is sent—like an address for `search` or coordinates for `reverse_geocode`. The connection is over TLS, and Vinkius runs each server in an ephemeral sandbox, so your query data isn't stored after the request is complete.

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