surf-mcp

MCP server for people who surf waves and the web.

• Fetch tide information for any location using latitude and longitude
• Support for date-specific tide queries
• Detailed tide data including high/low tides and station information
• Automatic time zone handling (UTC)

• Python 3.x
• Storm Glass API key

1. Visit Storm Glass
2. Click "Try for Free" or "Sign In" to create an account
3. Once registered, you'll receive your API key

Note on API Usage Limits:

• Free tier: 10 requests per day
• Paid plans available:
  • Small: 500 requests/day (€19/month)
  • Medium: 5000 requests/day (€49/month)
  • Large: 25,000 requests/day (€129/month)
  • Enterprise: Custom plans available

Choose a plan based on your usage requirements. The free tier is suitable for testing and personal use.

1. Clone the repository:

git clone https://github.com/ravinahp/surf-mcp.git
cd surf-mcp

2. Install dependencies using uv:

uv sync

Note: We use uv instead of pip since the project uses pyproject.toml for dependency management.

To add this tool as an MCP server, you'll need to modify your Claude desktop configuration file. This configuration includes your Storm Glass API key, so you won't need to set it up separately.

The configuration file location depends on your operating system:

• MacOS: ~/Library/Application\ Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%/Claude/claude_desktop_config.json

Add the following configuration to your JSON file:

{
    "surf-mcp": {
        "command": "uv",
        "args": [
            "--directory",
            "/Users/YOUR_USERNAME/Code/surf-mcp",
            "run",
            "surf-mcp"
        ],
        "env": {
            "STORMGLASS_API_KEY": "your_api_key_here"
        }
    }
}

⚠️ IMPORTANT:

1. Replace YOUR_USERNAME with your actual system username
2. Replace your_api_key_here with your actual Storm Glass API key
3. Make sure the directory path matches your local installation

To prepare the package:

1. Sync dependencies and update lockfile:

uv sync

2. Build package:

uv build

This will create distributions in the dist/ directory.

Since MCP servers run over stdio, debugging can be challenging. For the best debugging experience, we strongly recommend using the MCP Inspector.

You can launch the MCP Inspector with this command:

npx @modelcontextprotocol/inspector uv --directory /path/to/surf-mcp run surf-mcp

Upon launching, the Inspector will display a URL that you can access in your browser to begin debugging.

The Inspector provides:

• Real-time request/response monitoring
• Input/output validation
• Error tracking
• Performance metrics

The service provides a FastMCP tool for getting tide information:

@mcp.tool()
async def get_tides(latitude: float, longitude: float, date: str) -> str:
    """Get tide information for a specific location and date."""

• latitude: Float value representing the location's latitude
• longitude: Float value representing the location's longitude
• date: Date string in YYYY-MM-DD format

Tide Times:
Time: 2024-01-20T00:30:00+00:00 (UTC)
Type: HIGH tide
Height: 1.52m

Time: 2024-01-20T06:45:00+00:00 (UTC)
Type: LOW tide
Height: 0.25m

Station Information:
Name: Sample Station
Distance: 20.5km from requested location

You can use this tool to determine the optimal surfing time at your favorite beach & the closest station. Generally, the best surfing conditions are during incoming (rising) tides, about 2 hours before high tide.

Example prompt to Claude:

Note: Different beaches may have different optimal tide conditions based on their specific geography and break type. This tool also provides station distance information which should be considered alongside tide information. (ie. longer station distance means higher change of innacuracy - you can ask Claude for this as well when prompting).

Error Handling

The service includes robust error handling for:

• API request failures
• Invalid coordinates
• Missing or invalid API keys
• Network timeouts