Fastn Server

The Fastn server is a powerful, scalable platform that enables dynamic tool registration and execution based on API definitions. It seamlessly integrates with services like Claude.ai and Cursor.ai, providing a unified server solution for a wide range of tasks. With its robust architecture, Fastn delivers exceptional performance and flexibility for real-time, API-driven operations.

Getting Started

Package Installation (Recommended)

The easiest way to install the Fastn server is using pip:

pip install fastn-mcp-server

After installation, you can run the server with:

fastn-mcp-server --api_key YOUR_API_KEY --space_id YOUR_SPACE_ID

When using the package installation, your configuration for AI assistants will look like:

macOS/Linux:

{
    "mcpServers": {
        "fastn": {
            "command": "/path/to/fastn-mcp-server",
            "args": [
                "--api_key",
                "YOUR_API_KEY",
                "--space_id",
                "YOUR_WORKSPACE_ID"
            ]
        }
    }
}

Windows:

{
    "mcpServers": {
        "fastn": {
            "command": "C:\\path\\to\\fastn-mcp-server.exe",
            "args": [
                "--api_key",
                "YOUR_API_KEY",
                "--space_id",
                "YOUR_WORKSPACE_ID"
            ]
        }
    }
}

To find the exact path of the installed fastn-server command:

On macOS/Linux: which fastn-server
On Windows: where fastn-server

Features

Integrated platform support - Use services like Slack, Notion, HubSpot, and many more through the Fastn server after completing the simple setup
Logging support - Comprehensive logging system
Error handling - Robust error management for various scenarios

Step-by-Step Setup Guide

Step 1: Fastn Setup

Login to your Fastn account
Go to "Connectors" from the left sidebar
Activate the service(s) you want to use by clicking on activate.
Go to "Settings" from the left sidebar
Click on "Generate API Key" and save it somewhere locally (e.g., in a notepad)
Click on the copy button that exists on the top bar (left side of your profile)
Copy your Workspace ID and save it as well
All setup from Fastn is now complete

Step 2: Server Setup

Option 1: Use Package Installation (Recommended)

See the "Package Installation" section above.

Option 2: Manual Setup

Prerequisites

Python 3.10 or higher

Quick Start

macOS

# Clone repository and navigate to directory
git clone <your-repo-url> && cd fastn-server

# Install UV, create virtual environment, and install dependencies in one go
curl -LsSf https://astral.sh/uv/install.sh | sh && uv venv && source .venv/bin/activate && uv pip install -e .

# Run server (specify platform with --platform flag)
uv run fastn-server.py --api_key YOUR_API_KEY --space_id YOUR_SPACE_ID

Windows

# Clone repository and navigate to directory
git clone <your-repo-url> && cd fastn-server

# Install UV, create a virtual environment, and install dependencies
# Option 1: Install UV using pip
python -m pip install uv
# Make sure to copy the installation path and add it to your Windows environment variables.

# Option 2: Install UV using PowerShell
powershell -c "irm https://astral.sh/uv/install.ps1 | iex" && uv venv && .venv\Scripts\activate && uv pip install -e .

# Run server (specify platform with --platform flag)
uv run fastn-server.py --api_key YOUR_API_KEY --space_id YOUR_SPACE_ID

Step 3: Integration with AI Assistants

For Package Installation (Option 1)

Find the path to your installed fastn-server:
- On macOS/Linux: which fastn-server
- On Windows: where fastn-server
Configure your AI assistant with the path from step 1.

For Manual Installation (Option 2)

Integration with Claude On Mac OS

Open the Claude configuration:

code ~/Library/Application\ Support/Claude/claude_desktop_config.json

Add the following configuration (replace placeholders with your actual values):

{
    "mcpServers": {
        "fastn": {
            "command": "/path/to/your/uv",
            "args": [
                "--directory",
                "/path/to/your/fastn-server",
                "run",
                "fastn-server.py",
                "--api_key",
                "YOUR_API_KEY",
                "--space_id",
                "YOUR_WORKSPACE_ID"
            ]
        }
    }
}

Integration with Cursor

Open Cursor settings
Click on "MCP" in the settings menu
Click on "Add New"
Add a name for your server (e.g., "fastn")
Select "Command" as the type
Add the following command (replace placeholders with your actual values):

/path/to/your/uv --directory /path/to/your/fastn-server run fastn-server.py --api_key YOUR_API_KEY --space_id YOUR_WORKSPACE_ID

Detailed Integration Instructions

For Claude

Open the Claude configuration file:
- Windows: notepad "%APPDATA%\Claude\claude_desktop_config.json" or code "%APPDATA%\Claude\claude_desktop_config.json"
- Mac: open -a TextEdit ~/Library/Application\ Support/Claude/claude_desktop_config.json or code ~/Library/Application\ Support/Claude/claude_desktop_config.json
Add the appropriate configuration JSON based on your installation method.

For Cursor

Open Cursor settings
Click on "MCP" in the settings menu
Click on "Add New"
Add a name for your server (e.g., "fastn")
Select "Command" as the type
Use the appropriate configuration based on your installation method

Troubleshooting

Package Structure Error

If you encounter an error like this during installation:

ValueError: Unable to determine which files to ship inside the wheel using the following heuristics:
The most likely cause of this is that there is no directory that matches the name of your project (fastn).

Quick Fix:

Make sure pyproject.toml has the wheel configuration:

[tool.hatch.build.targets.wheel]
packages = ["."]

Then install dependencies:

uv pip install "httpx>=0.28.1" "mcp[cli]>=1.2.0"

Run the server:

uv run fastn-server.py --api_key YOUR_API_KEY --space_id YOUR_SPACE_ID

Logging

Logs are output with timestamp, level, and message in the following format:

%(asctime)s - %(levelname)s - %(message)s

Support

For questions, issues, or feature requests, please visit:

Documentation: https://docs.fastn.ai
Community: https://community.fastn.ai

License

This project is licensed under the terms included in the LICENSE file.