How do I use Travel Planner MCP Server?

1. Click on "Install Server". 2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state. 3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@Travel Planner MCP Server Plan a 3-day trip to Tokyo starting June 1st including the weather forecast." That's it! The server will respond to your query, and you can continue using it as needed. Here is a step-by-step guide with screenshots.

Travel Planner MCP Server

A multi-agent travel planning system built with Google Agent Development Kit (ADK) that exposes its tools via the Model Context Protocol (MCP).

The system uses a root agent with two sub-agents — a weather agent and a travel plan agent — to create weather-aware 3-day travel itineraries. The tools are also exposed through an MCP server, making them accessible to any MCP-compliant client.

Architecture

┌─────────────────────────────────────────────────┐
│                  Root Agent                      │
│            (travel_planner)                      │
│                                                  │
│  Orchestrates the travel planning workflow:      │
│  gather info → check weather → create plan       │
│                                                  │
│  ┌─────────────────┐  ┌──────────────────────┐  │
│  │  Weather Agent   │  │  Travel Plan Agent   │  │
│  │                  │  │                      │  │
│  │  get_weather()   │  │  create_travel_plan()│  │
│  │  (Open-Meteo API)│  │  (itinerary builder) │  │
│  └─────────────────┘  └──────────────────────┘  │
└─────────────────────────────────────────────────┘

                    ▼ exposed via ▼

┌─────────────────────────────────────────────────┐
│              MCP Server (stdio)                  │
│                                                  │
│  Wraps ADK FunctionTools and exposes them as     │
│  MCP tools accessible to any MCP client          │
│                                                  │
│  Tools: get_weather, create_travel_plan          │
└─────────────────────────────────────────────────┘

Project Structure

travel-planner-mcp-server/
├── travel_planner/              # ADK multi-agent package
│   ├── __init__.py
│   ├── agent.py                 # Root agent (orchestrator with sub-agents)
│   ├── sub_agents/
│   │   ├── __init__.py
│   │   ├── weather_agent.py     # Weather specialist sub-agent
│   │   └── travel_plan_agent.py # Travel planning specialist sub-agent
│   └── tools/
│       ├── __init__.py
│       ├── weather_tools.py     # Open-Meteo API weather tool
│       └── travel_tools.py      # Travel plan generation tool
├── mcp_server.py                # MCP server exposing ADK tools
├── adk_client_agent/            # Example ADK agent consuming the MCP server
│   └── mcp_travel_client/
│       ├── __init__.py
│       └── agent.py
├── pyproject.toml
├── requirements.txt
├── .env.example
└── README.md

Prerequisites

Python 3.10+
A Google API key (for Gemini model access)

Setup

Clone the repository:

git clone <repo-url>
cd travel-planner-mcp-server

Install dependencies:
```
pip install -r requirements.txt
```

Configure environment:

cp .env.example .env
# Edit .env and add your Google API key

Usage

Option 1: Run the ADK Multi-Agent System Directly

This uses the root agent with its sub-agents through the ADK web UI:

adk web
# Select "travel_planner" in the browser UI

The root agent will:

Ask for your destination and travel date
Delegate to the weather agent to fetch the forecast
Delegate to the travel plan agent to create the itinerary
Present a comprehensive 3-day travel plan

Option 2: Run the MCP Server

This exposes the tools via MCP protocol for any MCP client to consume:

python mcp_server.py

The MCP server exposes two tools:

get_weather — Fetches 3-day weather forecast for a location using Open-Meteo API
create_travel_plan — Generates a structured 3-day travel itinerary template

Option 3: Run the MCP Client Agent

This demonstrates an ADK agent consuming the MCP server:

cd adk_client_agent
adk web
# Select "mcp_travel_client" in the browser UI

Option 4: Connect from Any MCP Client

Add to your MCP client configuration (e.g., Claude Desktop, Cursor, etc.):

{
  "mcpServers": {
    "travel-planner": {
      "command": "python3",
      "args": ["/path/to/mcp_server.py"]
    }
  }
}

Tools

`get_weather`

Fetches a 3-day weather forecast using the Open-Meteo API (free, no API key required).

Parameters:

Parameter	Type	Description
`location`	string	City or place name (e.g., "Paris", "Tokyo")
`date`	string	Start date in YYYY-MM-DD format

Returns: Temperature (C/F), conditions, precipitation, wind speed, and UV index for 3 days.

`create_travel_plan`

Generates a structured 3-day travel itinerary template.

Parameters:

Parameter	Type	Description
`location`	string	Destination city or place
`start_date`	string	Trip start date (YYYY-MM-DD)
`weather_summary`	string	Weather conditions summary
`interests`	string	Travel interests (default: "general sightseeing")

Returns: Day-by-day itinerary structure with time slots, meals, and tips.

How It Works

This project demonstrates Pattern 2 from the ADK documentation: Building an MCP server with ADK tools.

ADK FunctionTool wraps the Python tool functions
adk_to_mcp_tool_type() converts ADK tool schemas to MCP format
The MCP server advertises tools via list_tools and executes them via call_tool
Any MCP client can discover and invoke the tools through the standard protocol

License

MIT

Travel Planner MCP Server

Travel Planner MCP Server

Architecture

Project Structure

Prerequisites

Setup

Usage

Option 1: Run the ADK Multi-Agent System Directly

Option 2: Run the MCP Server

Option 3: Run the MCP Client Agent

Option 4: Connect from Any MCP Client

Tools

`get_weather`

`create_travel_plan`

How It Works

License

Resources

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