dynamic-fastmcp

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Dynamic FastMCP is a Python library that extends the Official Model Context Protocol (MCP) Python SDK with dynamic tool capabilities. It allows you to create MCP tools that can adapt their behavior and descriptions based on request context, user information, and path parameters.

Dynamic FastMCP is used to power our multi-tenant Streamable HTTP MCP Server at Ragie. To learn more about how we use it in production, check out our blog post on Making MCP Tool Use Feel Natural with Context-Aware Tools.

• Dynamic Tool Descriptions: Tool descriptions that change based on context (user, request path, etc.)
• Context-Aware Tool Execution: Tools that can access request context during execution
• Hybrid Tool Support: Seamlessly combines regular MCP tools with dynamic tools
• FastAPI Integration: Easily mount on FastAPI applications with authentication
• Multi-tenant Support: Perfect for applications where tool behavior varies per user or tenant

pip install dynamic-fastmcp

Or using UV:

uv add dynamic-fastmcp

from dynamic_fastmcp import DynamicFastMCP, DynamicTool
from mcp.server.fastmcp import Context

# Create a Dynamic FastMCP instance
mcp = DynamicFastMCP()

# Regular tool - works just like standard FastMCP
@mcp.tool(description="Echoes the input text")
def echo(text: str, ctx: Context):
    return f"Echo: {text}"

# Dynamic tool - description and behavior adapt to context
@mcp.tool()
class PersonalizedEcho(DynamicTool):
    def name(self)