Odh Server

A FastMCP server that exposes hospitality data — accommodations, events, and gastronomy — through a unified MCP interface. Part of the GaiaWM ecosystem, it is open source, self-hostable, and designed to work both locally (stdio) and remotely (SSE / streamable-http).

The server maintains a "current world" in session context. A set_world tool switches the active world. All other tools query the current world transparently. The same find_accommodations call returns real hotel data from South Tyrol or fictional inn listings from a Spelljammer asteroid city.

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Quickstart

# Install with uv (recommended)
pip install uv

# Run locally via stdio (Claude Desktop, etc.)
uvx odh-mcp-server --stdio

# Or clone and run directly
git clone https://github.com/openfantasymap/odh-mcp-server
cd odh-mcp-server
uv run server.py --stdio

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Available worlds

World ID	Name	Data source	Notes
earth-313	South Tyrol	Open Data Hub (opendatahub.com)	Real hotels, events, restaurants. WGS84 coordinates.
bral	The Rock of Bral	JSON fixtures	Spelljammer city-asteroid. Mock data for demo/roleplay.

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Tools

Tool	Description
set_world	Switch the active world. Returns world description on success.
describe_world	Describe the current world and how to query it.
find_accommodations	Search for hotels / inns with optional geo, feature, and date filters.
find_events	Search for events with optional geo, date, and topic filters.
find_gastronomy	Search for restaurants and food places with geo and cuisine filters.

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Example session

# 1. Start in South Tyrol
set_world("earth-313")
→ World set to: South Tyrol (earth-313)
  Real hospitality data from the Open Data Hub...

# 2. Find hotels near Bolzano with a pool
find_accommodations(near="Bolzano centro", features=["pool"], max_results=3)
→ Found 2 accommodations in South Tyrol (earth-313), near Bolzano centro...

# 3. Switch to the Rock of Bral
set_world("bral")
→ World set to: The Rock of Bral
  A city-asteroid drifting through Wildspace...

# 4. Find an inn near the Great Market
find_accommodations(near="great market", radius_m=800)
→ Found 1 inn in the Rock of Bral, near great market...
  1. The Raised Cup [inn] (budget) — A lively taproom in the lower city...

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Claude Desktop config

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS):

{
  "mcpServers": {
    "odh-world": {
      "command": "uv",
      "args": ["run", "/path/to/odh-mcp-server/server.py", "--stdio"]
    }
  }
}

Or, once published to PyPI:

{
  "mcpServers": {
    "odh-world": {
      "command": "uvx",
      "args": ["odh-mcp-server", "--stdio"]
    }
  }
}

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Session context notes

The server uses contextvars.ContextVar to track the current world per session.

• SSE / streamable-http transport: each client connection gets its own context — multiple users can be in different worlds simultaneously.
• stdio transport: single process, single context — fine for local single-user use (Claude Desktop, CLI).

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Adding a new world

1. Create worlds/myworld.py and implement the WorldAdapter abstract base class:

from worlds.base import WorldAdapter, Accommodation, Event, GastronomyPlace, WorldInfo

class MyWorldAdapter(WorldAdapter):
    async def find_accommodations(self, ...) -> list[Accommodation]: ...
    async def find_events(self, ...) -> list[Event]: ...
    async def find_gastronomy(self, ...) -> list[GastronomyPlace]: ...
    async def describe(self) -> WorldInfo: ...

2. Register it in worlds/__init__.py:

from .myworld import MyWorldAdapter

WORLD_REGISTRY = {
    "earth-313": Earth313Adapter(),
    "bral": BralAdapter(),
    "myworld": MyWorldAdapter(),   # add this line
}

3. That's it. All tools will automatically support your new world once it's in the registry.

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Configuration

Copy .env.example to .env and adjust as needed:

DEFAULT_WORLD=earth-313
ODH_BASE_URL=https://tourism.api.opendatahub.com/v1
ODH_TIMEOUT=10
NOMINATIM_URL=https://nominatim.openstreetmap.org
NOMINATIM_USER_AGENT=odh-mcp-server/0.1 (opensource hospitality MCP)

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License

MIT