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Integrate FastMCP
This commit integrates FastMCP, a high-level MCP server implementation originally written by Jeremiah Lowin, into the official MCP SDK. It also updates dependencies and adds new dev dependencies. It moves the existing SDK into a .lowlevel .
This commit is contained in:
David Soria Parra
306
tests/server/fastmcp/test_tool_manager.py
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306
tests/server/fastmcp/test_tool_manager.py
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import logging
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from typing import Optional
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import pytest
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from pydantic import BaseModel
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import json
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from mcp.server.fastmcp.exceptions import ToolError
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from mcp.server.fastmcp.tools import ToolManager
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class TestAddTools:
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def test_basic_function(self):
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"""Test registering and running a basic function."""
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def add(a: int, b: int) -> int:
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"""Add two numbers."""
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return a + b
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manager = ToolManager()
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manager.add_tool(add)
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tool = manager.get_tool("add")
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assert tool is not None
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assert tool.name == "add"
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assert tool.description == "Add two numbers."
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assert tool.is_async is False
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assert tool.parameters["properties"]["a"]["type"] == "integer"
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assert tool.parameters["properties"]["b"]["type"] == "integer"
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async def test_async_function(self):
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"""Test registering and running an async function."""
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async def fetch_data(url: str) -> str:
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"""Fetch data from URL."""
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return f"Data from {url}"
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manager = ToolManager()
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manager.add_tool(fetch_data)
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tool = manager.get_tool("fetch_data")
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assert tool is not None
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assert tool.name == "fetch_data"
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assert tool.description == "Fetch data from URL."
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assert tool.is_async is True
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assert tool.parameters["properties"]["url"]["type"] == "string"
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def test_pydantic_model_function(self):
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"""Test registering a function that takes a Pydantic model."""
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class UserInput(BaseModel):
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name: str
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age: int
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def create_user(user: UserInput, flag: bool) -> dict:
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"""Create a new user."""
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return {"id": 1, **user.model_dump()}
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manager = ToolManager()
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manager.add_tool(create_user)
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tool = manager.get_tool("create_user")
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assert tool is not None
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assert tool.name == "create_user"
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assert tool.description == "Create a new user."
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assert tool.is_async is False
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assert "name" in tool.parameters["$defs"]["UserInput"]["properties"]
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assert "age" in tool.parameters["$defs"]["UserInput"]["properties"]
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assert "flag" in tool.parameters["properties"]
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def test_add_invalid_tool(self):
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manager = ToolManager()
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with pytest.raises(AttributeError):
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manager.add_tool(1) # type: ignore
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def test_add_lambda(self):
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manager = ToolManager()
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tool = manager.add_tool(lambda x: x, name="my_tool")
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assert tool.name == "my_tool"
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def test_add_lambda_with_no_name(self):
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manager = ToolManager()
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with pytest.raises(
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ValueError, match="You must provide a name for lambda functions"
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):
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manager.add_tool(lambda x: x)
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def test_warn_on_duplicate_tools(self, caplog):
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"""Test warning on duplicate tools."""
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def f(x: int) -> int:
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return x
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manager = ToolManager()
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manager.add_tool(f)
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with caplog.at_level(logging.WARNING):
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manager.add_tool(f)
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assert "Tool already exists: f" in caplog.text
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def test_disable_warn_on_duplicate_tools(self, caplog):
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"""Test disabling warning on duplicate tools."""
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def f(x: int) -> int:
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return x
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manager = ToolManager()
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manager.add_tool(f)
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manager.warn_on_duplicate_tools = False
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with caplog.at_level(logging.WARNING):
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manager.add_tool(f)
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assert "Tool already exists: f" not in caplog.text
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class TestCallTools:
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async def test_call_tool(self):
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def add(a: int, b: int) -> int:
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"""Add two numbers."""
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return a + b
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manager = ToolManager()
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manager.add_tool(add)
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result = await manager.call_tool("add", {"a": 1, "b": 2})
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assert result == 3
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async def test_call_async_tool(self):
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async def double(n: int) -> int:
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"""Double a number."""
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return n * 2
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manager = ToolManager()
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manager.add_tool(double)
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result = await manager.call_tool("double", {"n": 5})
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assert result == 10
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async def test_call_tool_with_default_args(self):
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def add(a: int, b: int = 1) -> int:
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"""Add two numbers."""
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return a + b
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manager = ToolManager()
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manager.add_tool(add)
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result = await manager.call_tool("add", {"a": 1})
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assert result == 2
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async def test_call_tool_with_missing_args(self):
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def add(a: int, b: int) -> int:
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"""Add two numbers."""
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return a + b
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manager = ToolManager()
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manager.add_tool(add)
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with pytest.raises(ToolError):
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await manager.call_tool("add", {"a": 1})
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async def test_call_unknown_tool(self):
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manager = ToolManager()
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with pytest.raises(ToolError):
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await manager.call_tool("unknown", {"a": 1})
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async def test_call_tool_with_list_int_input(self):
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def sum_vals(vals: list[int]) -> int:
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return sum(vals)
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manager = ToolManager()
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manager.add_tool(sum_vals)
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# Try both with plain list and with JSON list
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result = await manager.call_tool("sum_vals", {"vals": "[1, 2, 3]"})
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assert result == 6
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result = await manager.call_tool("sum_vals", {"vals": [1, 2, 3]})
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assert result == 6
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async def test_call_tool_with_list_str_or_str_input(self):
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def concat_strs(vals: list[str] | str) -> str:
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return vals if isinstance(vals, str) else "".join(vals)
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manager = ToolManager()
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manager.add_tool(concat_strs)
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# Try both with plain python object and with JSON list
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result = await manager.call_tool("concat_strs", {"vals": ["a", "b", "c"]})
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assert result == "abc"
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result = await manager.call_tool("concat_strs", {"vals": '["a", "b", "c"]'})
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assert result == "abc"
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result = await manager.call_tool("concat_strs", {"vals": "a"})
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assert result == "a"
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result = await manager.call_tool("concat_strs", {"vals": '"a"'})
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assert result == '"a"'
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async def test_call_tool_with_complex_model(self):
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from mcp.server.fastmcp import Context
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class MyShrimpTank(BaseModel):
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class Shrimp(BaseModel):
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name: str
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shrimp: list[Shrimp]
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x: None
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def name_shrimp(tank: MyShrimpTank, ctx: Context) -> list[str]:
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return [x.name for x in tank.shrimp]
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manager = ToolManager()
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manager.add_tool(name_shrimp)
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result = await manager.call_tool(
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"name_shrimp",
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{"tank": {"x": None, "shrimp": [{"name": "rex"}, {"name": "gertrude"}]}},
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)
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assert result == ["rex", "gertrude"]
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result = await manager.call_tool(
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"name_shrimp",
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{"tank": '{"x": null, "shrimp": [{"name": "rex"}, {"name": "gertrude"}]}'},
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)
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assert result == ["rex", "gertrude"]
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class TestToolSchema:
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async def test_context_arg_excluded_from_schema(self):
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from mcp.server.fastmcp import Context
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def something(a: int, ctx: Context) -> int:
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return a
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manager = ToolManager()
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tool = manager.add_tool(something)
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assert "ctx" not in json.dumps(tool.parameters)
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assert "Context" not in json.dumps(tool.parameters)
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assert "ctx" not in tool.fn_metadata.arg_model.model_fields
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class TestContextHandling:
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"""Test context handling in the tool manager."""
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def test_context_parameter_detection(self):
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"""Test that context parameters are properly detected in Tool.from_function()."""
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from mcp.server.fastmcp import Context
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def tool_with_context(x: int, ctx: Context) -> str:
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return str(x)
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manager = ToolManager()
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tool = manager.add_tool(tool_with_context)
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assert tool.context_kwarg == "ctx"
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def tool_without_context(x: int) -> str:
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return str(x)
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tool = manager.add_tool(tool_without_context)
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assert tool.context_kwarg is None
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async def test_context_injection(self):
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"""Test that context is properly injected during tool execution."""
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from mcp.server.fastmcp import Context, FastMCP
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def tool_with_context(x: int, ctx: Context) -> str:
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assert isinstance(ctx, Context)
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return str(x)
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manager = ToolManager()
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manager.add_tool(tool_with_context)
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mcp = FastMCP()
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ctx = mcp.get_context()
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result = await manager.call_tool("tool_with_context", {"x": 42}, context=ctx)
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assert result == "42"
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async def test_context_injection_async(self):
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"""Test that context is properly injected in async tools."""
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from mcp.server.fastmcp import Context, FastMCP
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async def async_tool(x: int, ctx: Context) -> str:
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assert isinstance(ctx, Context)
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return str(x)
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manager = ToolManager()
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manager.add_tool(async_tool)
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mcp = FastMCP()
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ctx = mcp.get_context()
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result = await manager.call_tool("async_tool", {"x": 42}, context=ctx)
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assert result == "42"
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async def test_context_optional(self):
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"""Test that context is optional when calling tools."""
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from mcp.server.fastmcp import Context
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def tool_with_context(x: int, ctx: Optional[Context] = None) -> str:
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return str(x)
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manager = ToolManager()
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manager.add_tool(tool_with_context)
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# Should not raise an error when context is not provided
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result = await manager.call_tool("tool_with_context", {"x": 42})
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assert result == "42"
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async def test_context_error_handling(self):
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"""Test error handling when context injection fails."""
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from mcp.server.fastmcp import Context, FastMCP
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def tool_with_context(x: int, ctx: Context) -> str:
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raise ValueError("Test error")
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manager = ToolManager()
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manager.add_tool(tool_with_context)
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mcp = FastMCP()
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ctx = mcp.get_context()
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with pytest.raises(ToolError, match="Error executing tool tool_with_context"):
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await manager.call_tool("tool_with_context", {"x": 42}, context=ctx)
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