MoltTravel

One MCP server. Every travel tool.

Search flights, compare prices, check visas, look up airports,
get travel advisories — through a single endpoint.

Code

  Kiwi.com    Navifare     Peek.com    LastMinute
  (flights)   (prices)   (experiences)  (flights)
      \          |           |          /
       \         |           |         /
        +--------+-----------+--------+
        |                             |
        |    MoltTravel MCP Server    |
        |                             |
        |  Airports  Airlines  Visas  |
        |  Countries  FCDO  Gemini AI |
        |                             |
        +-------------|---------------+
                      |
               MCP over HTTP
                      |
              Any MCP Client
        (Claude, Cursor, your app)

Why?

Travel data is scattered across dozens of APIs, each with its own auth, format, and quirks. MoltTravel aggregates them behind a single Model Context Protocol endpoint:

21+ tools from 4 upstream MCP providers + 6 built-in datasets
Zero config for static data — airports, airlines, and visas load lazily with no API keys
Schema-transparent proxy — clients see the real upstream JSON Schema; upstream servers validate their own args
One line to connect from Claude Desktop, Claude Code, Cursor, or any MCP client

Quick Start

bash

git clone https://github.com/navifare/moltravel-mcp.git
cd moltravel-mcp
python -m venv venv && source venv/bin/activate
pip install -r requirements.txt
python molttravel_server.py

Server starts at http://localhost:8000/mcp. That's it.

Connect Your Client

Claude Desktop

Add to claude_desktop_config.json:

config.json

{
  "mcpServers": {
    "molttravel": {
      "url": "http://localhost:8000/mcp"
    }
  }
}

Claude Code

Add to .claude/settings.json:

config.json

{
  "mcpServers": {
    "molttravel": {
      "url": "http://localhost:8000/mcp"
    }
  }
}

Python (programmatic)

server.ts

from mcp import ClientSession
from mcp.client.streamable_http import streamablehttp_client

async with streamablehttp_client("http://localhost:8000/mcp") as (r, w, _):
    async with ClientSession(r, w) as session:
        await session.initialize()
        tools = await session.list_tools()
        result = await session.call_tool("airports_lookup", {"code": "ZRH"})

Tools

Flights & Pricing

Tool	Provider	What it does
`kiwi_search-flight`	Kiwi.com	Search flights by route, date, passengers, cabin class
`navifare_format_flight_pricecheck_request`	Navifare	Parse flight details from natural language into structured data
`navifare_flight_pricecheck`	Navifare	Compare a flight's price across multiple booking sites

Experiences & Activities

Tool	Provider	What it does
`peek_search_experiences`	Peek.com	Search 300K+ verified activities worldwide
`peek_experience_details`	Peek.com	Full details, reviews, and photos for an experience
`peek_experience_availability`	Peek.com	Check availability and pricing for specific dates
`peek_search_regions`	Peek.com	Find region IDs by name
`peek_list_tags`	Peek.com	Browse activity categories and tags
`peek_render_activity_tiles`	Peek.com	Render embeddable activity widgets

Reference Data _{(built-in, no API keys needed)}

Tool	Dataset	What it does
`airports_lookup`	OurAirports	Look up by IATA or ICAO code
`airports_search`	OurAirports	Search by name, filter by country or type
`airports_near`	OurAirports	Find airports within a radius of any coordinates
`airlines_lookup`	OpenFlights	Look up by IATA or ICAO code
`airlines_search`	OpenFlights	Search by name, filter by country or active status
`visa_check`	Passport Index	Check visa requirement between two countries
`visa_summary`	Passport Index	Full visa-free/VOA/e-visa breakdown for a passport
`restcountries_country_info`	REST Countries	Capital, currencies, languages, timezones, population
`fcdo_travel_advice`	UK FCDO	Safety advisories, entry requirements, health warnings
`fcdo_list_countries`	UK FCDO	List all countries with travel advisories
`data_status`	—	Check which datasets are loaded and record counts

Natural Language _(optional)

Tool	What it does
`travel_agent`	Ask any travel question — Gemini routes to the right tools and returns a combined answer

Requires GEMINI_API_KEY. Example: "Cheapest flights from Zurich to Rome next week, and do I need a visa?"

How It Works

1. Tool Discovery

On startup, MoltTravel connects to each upstream MCP server, calls tools/list, and registers every discovered tool with a {provider}_{tool_name} prefix:

Code

kiwi       → kiwi_search-flight, kiwi_feedback-to-devs
navifare   → navifare_flight_pricecheck, navifare_format_flight_pricecheck_request
peek       → peek_search_experiences, peek_experience_details, ...
lastminute → (discovered at runtime)

Native tools (airports, airlines, visas, countries, FCDO) are registered directly.

2. Schema-Transparent Proxy

Clients see the original upstream JSON Schema for each tool — enums, nested objects, $ref, everything. Internally, MoltTravel uses a permissive Pydantic model (Any for all fields) so arguments pass through without lossy validation. The upstream MCP server validates its own args.

python

# Client sees the real schema
parameters = input_schema          # original from upstream

# Server doesn't re-validate types — just passes through
fields[prop_name] = (Any, Field(default=None))

3. Lazy Data Loading

Static datasets (airports, airlines, visas) download on first use behind async locks. No startup penalty, no wasted bandwidth if you only use flight tools.

Configuration

Variable	Default	Description
`PORT`	`8000`	Server port
`GEMINI_API_KEY`	—	Enables the `travel_agent` natural-language routing tool

Deployment

Docker

Dockerfile

FROM python:3.12-slim
WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt
COPY . .
EXPOSE 8000
CMD ["python", "molttravel_server.py"]

Terminal

docker build -t molttravel .
docker run -p 8000:8000 molttravel

Render / Railway / Fly.io

The server reads PORT from the environment and binds to 0.0.0.0 — it works out of the box on any container platform. Just point the start command at python molttravel_server.py.

Project Structure

Code

moltravel-mcp/
├── molttravel_server.py        # Server core — proxy logic, native tools, routing
├── requirements.txt            # mcp[cli], httpx
├── test_search.py              # Integration test client
└── providers/
    ├── __init__.py             # MCP_PROVIDERS registry + exports
    ├── mcp_client.py           # Generic HTTP client for upstream MCP servers
    ├── data_loader.py          # CSV downloader + haversine distance
    ├── airports.py             # 45K airports from OurAirports
    ├── airlines.py             # 7K airlines from OpenFlights
    ├── visas.py                # Visa requirements from Passport Index
    ├── restcountries.py        # REST Countries API
    ├── fcdo.py                 # UK FCDO travel advisories
    └── gemini.py               # Gemini Flash tool router

Extending

Add an MCP provider

Add one line to providers/__init__.py and restart:

python

MCP_PROVIDERS = {
    "kiwi": McpClient("https://mcp.kiwi.com/mcp"),
    "navifare": McpClient("https://mcp.navifare.com/mcp"),
    "peek": McpClient("https://mcp.peek.com/mcp"),
    "your_provider": McpClient("https://mcp.example.com/mcp"),  # new
}

Tools are discovered and registered automatically as your_provider_{tool_name}.

Add a native tool

server.ts

@server.tool(name="my_tool")
async def my_tool(query: str) -> str:
    """Description shown to MCP clients."""
    return "result"

Data Sources & Licenses

Dataset	Source	License
Airports	OurAirports	Public Domain
Airlines	OpenFlights	ODbL 1.0
Visa Requirements	Passport Index	MIT
Country Info	REST Countries	MPL 2.0
Travel Advisories	UK FCDO	OGL v3.0

Contributing

Fork the repo
Create a branch (git checkout -b feature/my-feature)
Make changes and test (python molttravel_server.py)
Open a pull request

License

MIT

MoltTravel

Why?

Quick Start

Connect Your Client

Tools

Flights & Pricing

Experiences & Activities

Reference Data (built-in, no API keys needed)

Natural Language (optional)

How It Works

1. Tool Discovery

2. Schema-Transparent Proxy

3. Lazy Data Loading

Configuration

Deployment

Project Structure

Extending

Add an MCP provider

Add a native tool

Data Sources & Licenses

Contributing

License

Reference Data _{(built-in, no API keys needed)}

Natural Language _(optional)