Description
Describe the bug
resourceTemplates do not work, but actually it seems they do work....
To Reproduce
Steps to reproduce the behavior:
Follow the example at: https://github.com/modelcontextprotocol/python-sdk
Create the Demo server in latest release:
# server.py
from mcp.server.fastmcp import FastMCP
# Create an MCP server
mcp = FastMCP("Demo")
# Add an addition tool
@mcp.tool()
def add(a: int, b: int) -> int:
"""Add two numbers"""
return a + b
# Add a dynamic greeting resource
@mcp.resource("greeting://{name}")
def get_greeting(name: str) -> str:
"""Get a personalized greeting"""
return f"Hello, {name}!"
@mcp.resource("config://app")
def get_config() -> str:
"""Static configuration data"""
return "App configuration here"
@mcp.resource("users://{user_id}/profile")
def get_user_profile(user_id: str) -> str:
"""Dynamic user data"""
return f"Profile data for user {user_id}"Expected behavior
Using inspector I should be able to 'List Resources' (that works) and 'List Templates(throws error).
Click List Templates in inspector throws:
Error
MCP error -32601: Method not found
I should see the two resourceTemplates in my Demo server.py
There are open issues in this repository related to same behavior with resourceTemplates and ./.venv/lib/python3.12/site-packages/mcp/server/fastmcp/server.py there is:
def _setup_handlers(self) -> None:
"""Set up core MCP protocol handlers."""
self._mcp_server.list_tools()(self.list_tools)
self._mcp_server.call_tool()(self.call_tool)
self._mcp_server.list_resources()(self.list_resources)
self._mcp_server.read_resource()(self.read_resource)
self._mcp_server.list_prompts()(self.list_prompts)
self._mcp_server.get_prompt()(self.get_prompt)
# TODO: This has not been added to MCP yet, see https://github.com/jlowin/fastmcp/issues/10
# self._mcp_server.list_resource_templates()(self.list_resource_templates)I removed the comment
def _setup_handlers(self) -> None:
"""Set up core MCP protocol handlers."""
self._mcp_server.list_tools()(self.list_tools)
self._mcp_server.call_tool()(self.call_tool)
self._mcp_server.list_resources()(self.list_resources)
self._mcp_server.read_resource()(self.read_resource)
self._mcp_server.list_prompts()(self.list_prompts)
self._mcp_server.get_prompt()(self.get_prompt)
# TODO: This has not been added to MCP yet, see https://github.com/jlowin/fastmcp/issues/10
self._mcp_server.list_resource_templates()(self.list_resource_templates)Apparently resourceTemplates are added to MCP (and I use them myself prior to FastMCP, just with python SDK)
Now I get the expected result.
REQUEST:
{"method":"resources/templates/list","params":{}}RESPONSE:
{"resourceTemplates":[{"uriTemplate":"greeting://{name}","name":"get_greeting","description":"Get a personalized greeting"},{"uriTemplate":"users://{user_id}/profile","name":"get_user_profile","description":"Dynamic user data"}]}Desktop (please complete the following information):
OS: Monterey 12.7.6
Browser Chrome
Additional context
just need to remove the '#' and enable the method it seems...