Welcome! This guide will help you quickly set up FlashMCP and run your first MCP server. If you haven’t already installed FlashMCP, follow the installation instructions.

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Creating a FlashMCP Server

A FlashMCP server is a collection of tools, resources, and other MCP components. To create a server, start by instantiating the FlashMCP class. Create a new file called my_server.py and add the following code:
my_server.py
from FlashMCP import FlashMCP

mcp = FlashMCP("My MCP Server")
That’s it! You’ve created a FlashMCP server, albeit a very boring one. Let’s add a tool to make it more interesting.

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Adding a Tool

To add a tool that returns a simple greeting, write a function and decorate it with @mcp.tool to register it with the server:
my_server.py
from FlashMCP import FlashMCP

mcp = FlashMCP("My MCP Server")

@mcp.tool()
def greet(name: str) -> str:
    return f"Hello, {name}!"

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Testing the Server

To test the server, create a FlashMCP client and point it at the server object.
my_server.py
import asyncio
from FlashMCP import FlashMCP, Client

mcp = FlashMCP("My MCP Server")

@mcp.tool()
def greet(name: str) -> str:
    return f"Hello, {name}!"

client = Client(mcp)

async def call_tool(name: str):
    async with client:
        result = await client.call_tool("greet", {"name": name})
        print(result)

asyncio.run(call_tool("Ford"))
There are a few things to note here:
  • Clients are asynchronous, so we need to use asyncio.run to run the client.
  • We must enter a client context (async with client:) before using the client. You can make multiple client calls within the same context.

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Running the server

In order to run the server with Python, we need to add a run statement to the __main__ block of the server file.
my_server.py
from FlashMCP import FlashMCP

mcp = FlashMCP("My MCP Server")

@mcp.tool()
def greet(name: str) -> str:
    return f"Hello, {name}!"

if __name__ == "__main__":
    mcp.run()
This lets us run the server with python my_server.py, using the default stdio transport, which is the standard way to expose an MCP server to a client.
Why do we need the if __name__ == "__main__": block?Within the FlashMCP ecosystem, this line may be unnecessary. However, including it ensures that your FlashMCP server runs for all users and clients in a consistent way and is therefore recommended as best practice.

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Interacting with the Python server

Now that the server can be executed with python my_server.py, we can interact with it like any other MCP server. In a new file, create a client and point it at the server file:
my_client.py
import asyncio
from FlashMCP import Client

client = Client("my_server.py")

async def call_tool(name: str):
    async with client:
        result = await client.call_tool("greet", {"name": name})
        print(result)

asyncio.run(call_tool("Ford"))

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Using the FlashMCP CLI

To have FlashMCP run the server for us, we can use the FlashMCP run command. This will start the server and keep it running until it is stopped. By default, it will use the stdio transport, which is a simple text-based protocol for interacting with the server. 
FlashMCP run my_server.py:mcp
Note that FlashMCP does not require the __main__ block in the server file, and will ignore it if it is present. Instead, it looks for the server object provided in the CLI command (here, mcp). If no server object is provided, FlashMCP run will automatically search for servers called “mcp”, “app”, or “server” in the file.
We pointed our client at the server file, which is recognized as a Python MCP server and executed with python my_server.py by default. This executes the __main__ block of the server file. There are other ways to run the server, which are described in the server configuration guide.