Introduction to FastMCP
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Testing the Server with a FastMCP Client
MCP clients can be implemented in any programming language that can send JSON-RPC messages over the chosen transport.
In this section, we're not going to build a fully-fledged client, but just a simple one to test some tool calls to our server. Here's how we can quickly test with a FastMCP client in Python:
import asyncio
from fastmcp import Client
client = Client(<URL>)
async def call_tool(name: str):
async with client:
result = await client.call_tool(<tool_name>, <arguments>)
print(result)
asyncio.run(call_tool(<tool_arguments>))
Let's fill in the placeholders to call the sum tool we defined in our server:
cat > $HOME/workspace/fastmcp_demo/client.py << 'EOF'
import asyncio
from fastmcp import Client
client = Client("http://localhost:8000/mcp")
async def call_sum(a: int, b: intPractical MCP with FastMCP & LangChain
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