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Each MCP server now connects in its own asyncio.Task to isolate anyio cancel scopes and prevent 'exit cancel scope in different task' errors when multiple servers (especially mixed transport types) are configured. Changes: - connect_mcp_servers() returns dict[str, AsyncExitStack] instead of None - Each server runs in separate task via asyncio.gather() - AgentLoop uses _mcp_stacks dict to track per-server stacks - Tests updated to handle new API
597 lines
19 KiB
Python
597 lines
19 KiB
Python
from __future__ import annotations
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import asyncio
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from contextlib import AsyncExitStack, asynccontextmanager
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import sys
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from types import ModuleType, SimpleNamespace
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import pytest
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from nanobot.agent.tools.mcp import (
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MCPResourceWrapper,
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MCPPromptWrapper,
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MCPToolWrapper,
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connect_mcp_servers,
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)
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from nanobot.agent.tools.registry import ToolRegistry
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from nanobot.config.schema import MCPServerConfig
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class _FakeTextContent:
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def __init__(self, text: str) -> None:
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self.text = text
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class _FakeTextResourceContents:
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def __init__(self, text: str) -> None:
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self.text = text
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class _FakeBlobResourceContents:
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def __init__(self, blob: bytes) -> None:
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self.blob = blob
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@pytest.fixture
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def fake_mcp_runtime() -> dict[str, object | None]:
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return {"session": None}
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@pytest.fixture(autouse=True)
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def _fake_mcp_module(
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monkeypatch: pytest.MonkeyPatch, fake_mcp_runtime: dict[str, object | None]
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) -> None:
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mod = ModuleType("mcp")
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mod.types = SimpleNamespace(
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TextContent=_FakeTextContent,
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TextResourceContents=_FakeTextResourceContents,
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BlobResourceContents=_FakeBlobResourceContents,
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)
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class _FakeStdioServerParameters:
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def __init__(self, command: str, args: list[str], env: dict | None = None) -> None:
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self.command = command
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self.args = args
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self.env = env
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class _FakeClientSession:
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def __init__(self, _read: object, _write: object) -> None:
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self._session = fake_mcp_runtime["session"]
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async def __aenter__(self) -> object:
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return self._session
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async def __aexit__(self, exc_type, exc, tb) -> bool:
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return False
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@asynccontextmanager
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async def _fake_stdio_client(_params: object):
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yield object(), object()
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@asynccontextmanager
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async def _fake_sse_client(_url: str, httpx_client_factory=None):
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yield object(), object()
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@asynccontextmanager
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async def _fake_streamable_http_client(_url: str, http_client=None):
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yield object(), object(), object()
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mod.ClientSession = _FakeClientSession
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mod.StdioServerParameters = _FakeStdioServerParameters
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monkeypatch.setitem(sys.modules, "mcp", mod)
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client_mod = ModuleType("mcp.client")
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stdio_mod = ModuleType("mcp.client.stdio")
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stdio_mod.stdio_client = _fake_stdio_client
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sse_mod = ModuleType("mcp.client.sse")
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sse_mod.sse_client = _fake_sse_client
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streamable_http_mod = ModuleType("mcp.client.streamable_http")
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streamable_http_mod.streamable_http_client = _fake_streamable_http_client
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monkeypatch.setitem(sys.modules, "mcp.client", client_mod)
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monkeypatch.setitem(sys.modules, "mcp.client.stdio", stdio_mod)
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monkeypatch.setitem(sys.modules, "mcp.client.sse", sse_mod)
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monkeypatch.setitem(sys.modules, "mcp.client.streamable_http", streamable_http_mod)
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shared_mod = ModuleType("mcp.shared")
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exc_mod = ModuleType("mcp.shared.exceptions")
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class _FakeMcpError(Exception):
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def __init__(self, code: int = -1, message: str = "error"):
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self.error = SimpleNamespace(code=code, message=message)
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super().__init__(message)
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exc_mod.McpError = _FakeMcpError
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monkeypatch.setitem(sys.modules, "mcp.shared", shared_mod)
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monkeypatch.setitem(sys.modules, "mcp.shared.exceptions", exc_mod)
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def _make_wrapper(session: object, *, timeout: float = 0.1) -> MCPToolWrapper:
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tool_def = SimpleNamespace(
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name="demo",
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description="demo tool",
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inputSchema={"type": "object", "properties": {}},
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)
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return MCPToolWrapper(session, "test", tool_def, tool_timeout=timeout)
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def test_wrapper_preserves_non_nullable_unions() -> None:
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tool_def = SimpleNamespace(
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name="demo",
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description="demo tool",
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inputSchema={
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"type": "object",
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"properties": {
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"value": {
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"anyOf": [{"type": "string"}, {"type": "integer"}],
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}
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},
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},
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)
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wrapper = MCPToolWrapper(SimpleNamespace(call_tool=None), "test", tool_def)
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assert wrapper.parameters["properties"]["value"]["anyOf"] == [
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{"type": "string"},
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{"type": "integer"},
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]
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def test_wrapper_normalizes_nullable_property_type_union() -> None:
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tool_def = SimpleNamespace(
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name="demo",
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description="demo tool",
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inputSchema={
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"type": "object",
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"properties": {
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"name": {"type": ["string", "null"]},
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},
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},
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)
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wrapper = MCPToolWrapper(SimpleNamespace(call_tool=None), "test", tool_def)
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assert wrapper.parameters["properties"]["name"] == {"type": "string", "nullable": True}
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def test_wrapper_normalizes_nullable_property_anyof() -> None:
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tool_def = SimpleNamespace(
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name="demo",
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description="demo tool",
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inputSchema={
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"type": "object",
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"properties": {
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"name": {
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"anyOf": [{"type": "string"}, {"type": "null"}],
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"description": "optional name",
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},
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},
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},
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)
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wrapper = MCPToolWrapper(SimpleNamespace(call_tool=None), "test", tool_def)
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assert wrapper.parameters["properties"]["name"] == {
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"type": "string",
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"description": "optional name",
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"nullable": True,
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}
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@pytest.mark.asyncio
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async def test_execute_returns_text_blocks() -> None:
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async def call_tool(_name: str, arguments: dict) -> object:
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assert arguments == {"value": 1}
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return SimpleNamespace(content=[_FakeTextContent("hello"), 42])
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wrapper = _make_wrapper(SimpleNamespace(call_tool=call_tool))
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result = await wrapper.execute(value=1)
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assert result == "hello\n42"
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@pytest.mark.asyncio
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async def test_execute_returns_timeout_message() -> None:
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async def call_tool(_name: str, arguments: dict) -> object:
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await asyncio.sleep(1)
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return SimpleNamespace(content=[])
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wrapper = _make_wrapper(SimpleNamespace(call_tool=call_tool), timeout=0.01)
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result = await wrapper.execute()
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assert result == "(MCP tool call timed out after 0.01s)"
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@pytest.mark.asyncio
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async def test_execute_handles_server_cancelled_error() -> None:
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async def call_tool(_name: str, arguments: dict) -> object:
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raise asyncio.CancelledError()
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wrapper = _make_wrapper(SimpleNamespace(call_tool=call_tool))
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result = await wrapper.execute()
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assert result == "(MCP tool call was cancelled)"
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@pytest.mark.asyncio
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async def test_execute_re_raises_external_cancellation() -> None:
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started = asyncio.Event()
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async def call_tool(_name: str, arguments: dict) -> object:
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started.set()
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await asyncio.sleep(60)
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return SimpleNamespace(content=[])
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wrapper = _make_wrapper(SimpleNamespace(call_tool=call_tool), timeout=10)
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task = asyncio.create_task(wrapper.execute())
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await asyncio.wait_for(started.wait(), timeout=1.0)
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task.cancel()
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with pytest.raises(asyncio.CancelledError):
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await task
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@pytest.mark.asyncio
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async def test_execute_handles_generic_exception() -> None:
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async def call_tool(_name: str, arguments: dict) -> object:
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raise RuntimeError("boom")
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wrapper = _make_wrapper(SimpleNamespace(call_tool=call_tool))
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result = await wrapper.execute()
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assert result == "(MCP tool call failed: RuntimeError)"
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def _make_tool_def(name: str) -> SimpleNamespace:
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return SimpleNamespace(
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name=name,
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description=f"{name} tool",
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inputSchema={"type": "object", "properties": {}},
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)
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def _make_fake_session(tool_names: list[str]) -> SimpleNamespace:
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async def initialize() -> None:
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return None
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async def list_tools() -> SimpleNamespace:
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return SimpleNamespace(tools=[_make_tool_def(name) for name in tool_names])
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return SimpleNamespace(initialize=initialize, list_tools=list_tools)
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@pytest.mark.asyncio
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async def test_connect_mcp_servers_enabled_tools_supports_raw_names(
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fake_mcp_runtime: dict[str, object | None],
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) -> None:
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fake_mcp_runtime["session"] = _make_fake_session(["demo", "other"])
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registry = ToolRegistry()
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stacks = await connect_mcp_servers(
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{"test": MCPServerConfig(command="fake", enabled_tools=["demo"])},
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registry,
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)
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for stack in stacks.values():
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await stack.aclose()
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assert registry.tool_names == ["mcp_test_demo"]
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@pytest.mark.asyncio
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async def test_connect_mcp_servers_enabled_tools_defaults_to_all(
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fake_mcp_runtime: dict[str, object | None],
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) -> None:
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fake_mcp_runtime["session"] = _make_fake_session(["demo", "other"])
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registry = ToolRegistry()
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stacks = await connect_mcp_servers(
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{"test": MCPServerConfig(command="fake")},
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registry,
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)
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for stack in stacks.values():
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await stack.aclose()
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assert registry.tool_names == ["mcp_test_demo", "mcp_test_other"]
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@pytest.mark.asyncio
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async def test_connect_mcp_servers_enabled_tools_supports_wrapped_names(
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fake_mcp_runtime: dict[str, object | None],
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) -> None:
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fake_mcp_runtime["session"] = _make_fake_session(["demo", "other"])
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registry = ToolRegistry()
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stacks = await connect_mcp_servers(
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{"test": MCPServerConfig(command="fake", enabled_tools=["mcp_test_demo"])},
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registry,
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)
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for stack in stacks.values():
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await stack.aclose()
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assert registry.tool_names == ["mcp_test_demo"]
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@pytest.mark.asyncio
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async def test_connect_mcp_servers_enabled_tools_empty_list_registers_none(
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fake_mcp_runtime: dict[str, object | None],
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) -> None:
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fake_mcp_runtime["session"] = _make_fake_session(["demo", "other"])
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registry = ToolRegistry()
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stacks = await connect_mcp_servers(
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{"test": MCPServerConfig(command="fake", enabled_tools=[])},
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registry,
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)
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for stack in stacks.values():
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await stack.aclose()
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assert registry.tool_names == []
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@pytest.mark.asyncio
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async def test_connect_mcp_servers_enabled_tools_warns_on_unknown_entries(
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fake_mcp_runtime: dict[str, object | None], monkeypatch: pytest.MonkeyPatch
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) -> None:
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fake_mcp_runtime["session"] = _make_fake_session(["demo"])
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registry = ToolRegistry()
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warnings: list[str] = []
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def _warning(message: str, *args: object) -> None:
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warnings.append(message.format(*args))
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monkeypatch.setattr("nanobot.agent.tools.mcp.logger.warning", _warning)
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stacks = await connect_mcp_servers(
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{"test": MCPServerConfig(command="fake", enabled_tools=["unknown"])},
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registry,
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)
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for stack in stacks.values():
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await stack.aclose()
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assert registry.tool_names == []
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assert warnings
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assert "enabledTools entries not found: unknown" in warnings[-1]
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assert "Available raw names: demo" in warnings[-1]
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assert "Available wrapped names: mcp_test_demo" in warnings[-1]
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# ---------------------------------------------------------------------------
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# MCPResourceWrapper tests
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# ---------------------------------------------------------------------------
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def _make_resource_def(
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name: str = "myres",
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uri: str = "file:///tmp/data.txt",
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description: str = "A test resource",
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) -> SimpleNamespace:
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return SimpleNamespace(name=name, uri=uri, description=description)
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def _make_resource_wrapper(session: object, *, timeout: float = 0.1) -> MCPResourceWrapper:
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return MCPResourceWrapper(session, "srv", _make_resource_def(), resource_timeout=timeout)
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def test_resource_wrapper_properties() -> None:
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wrapper = MCPResourceWrapper(None, "myserver", _make_resource_def())
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assert wrapper.name == "mcp_myserver_resource_myres"
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assert "[MCP Resource]" in wrapper.description
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assert "A test resource" in wrapper.description
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assert "file:///tmp/data.txt" in wrapper.description
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assert wrapper.parameters == {"type": "object", "properties": {}, "required": []}
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assert wrapper.read_only is True
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@pytest.mark.asyncio
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async def test_resource_wrapper_execute_returns_text() -> None:
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async def read_resource(uri: str) -> object:
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assert uri == "file:///tmp/data.txt"
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return SimpleNamespace(
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contents=[_FakeTextResourceContents("line1"), _FakeTextResourceContents("line2")]
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)
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wrapper = _make_resource_wrapper(SimpleNamespace(read_resource=read_resource))
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result = await wrapper.execute()
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assert result == "line1\nline2"
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@pytest.mark.asyncio
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async def test_resource_wrapper_execute_handles_blob() -> None:
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async def read_resource(uri: str) -> object:
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return SimpleNamespace(contents=[_FakeBlobResourceContents(b"\x00\x01\x02")])
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wrapper = _make_resource_wrapper(SimpleNamespace(read_resource=read_resource))
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result = await wrapper.execute()
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assert "[Binary resource: 3 bytes]" in result
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@pytest.mark.asyncio
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async def test_resource_wrapper_execute_handles_timeout() -> None:
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async def read_resource(uri: str) -> object:
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await asyncio.sleep(1)
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return SimpleNamespace(contents=[])
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wrapper = _make_resource_wrapper(SimpleNamespace(read_resource=read_resource), timeout=0.01)
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result = await wrapper.execute()
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assert result == "(MCP resource read timed out after 0.01s)"
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@pytest.mark.asyncio
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async def test_resource_wrapper_execute_handles_error() -> None:
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async def read_resource(uri: str) -> object:
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raise RuntimeError("boom")
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wrapper = _make_resource_wrapper(SimpleNamespace(read_resource=read_resource))
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result = await wrapper.execute()
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assert result == "(MCP resource read failed: RuntimeError)"
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# ---------------------------------------------------------------------------
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# MCPPromptWrapper tests
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# ---------------------------------------------------------------------------
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def _make_prompt_def(
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name: str = "myprompt",
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description: str = "A test prompt",
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arguments: list | None = None,
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) -> SimpleNamespace:
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return SimpleNamespace(name=name, description=description, arguments=arguments)
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def _make_prompt_wrapper(session: object, *, timeout: float = 0.1) -> MCPPromptWrapper:
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return MCPPromptWrapper(session, "srv", _make_prompt_def(), prompt_timeout=timeout)
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def test_prompt_wrapper_properties() -> None:
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arg1 = SimpleNamespace(name="topic", required=True)
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arg2 = SimpleNamespace(name="style", required=False)
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wrapper = MCPPromptWrapper(None, "myserver", _make_prompt_def(arguments=[arg1, arg2]))
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assert wrapper.name == "mcp_myserver_prompt_myprompt"
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assert "[MCP Prompt]" in wrapper.description
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assert "A test prompt" in wrapper.description
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assert "workflow guide" in wrapper.description
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assert wrapper.parameters["properties"]["topic"] == {"type": "string"}
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assert wrapper.parameters["properties"]["style"] == {"type": "string"}
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assert wrapper.parameters["required"] == ["topic"]
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assert wrapper.read_only is True
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def test_prompt_wrapper_no_arguments() -> None:
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wrapper = MCPPromptWrapper(None, "myserver", _make_prompt_def())
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assert wrapper.parameters == {"type": "object", "properties": {}, "required": []}
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def test_prompt_wrapper_preserves_argument_descriptions() -> None:
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arg = SimpleNamespace(name="topic", required=True, description="The subject to discuss")
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wrapper = MCPPromptWrapper(None, "srv", _make_prompt_def(arguments=[arg]))
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assert wrapper.parameters["properties"]["topic"] == {
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"type": "string",
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"description": "The subject to discuss",
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}
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@pytest.mark.asyncio
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async def test_prompt_wrapper_execute_returns_text() -> None:
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async def get_prompt(name: str, arguments: dict | None = None) -> object:
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assert name == "myprompt"
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msg1 = SimpleNamespace(
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role="user",
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content=[_FakeTextContent("You are an expert on {{topic}}.")],
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)
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msg2 = SimpleNamespace(
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role="assistant",
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content=[_FakeTextContent("Understood. Ask me anything.")],
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)
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return SimpleNamespace(messages=[msg1, msg2])
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wrapper = _make_prompt_wrapper(SimpleNamespace(get_prompt=get_prompt))
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result = await wrapper.execute(topic="AI")
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assert "You are an expert on {{topic}}." in result
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assert "Understood. Ask me anything." in result
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@pytest.mark.asyncio
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async def test_prompt_wrapper_execute_handles_timeout() -> None:
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async def get_prompt(name: str, arguments: dict | None = None) -> object:
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await asyncio.sleep(1)
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return SimpleNamespace(messages=[])
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wrapper = _make_prompt_wrapper(SimpleNamespace(get_prompt=get_prompt), timeout=0.01)
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result = await wrapper.execute()
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assert result == "(MCP prompt call timed out after 0.01s)"
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@pytest.mark.asyncio
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async def test_prompt_wrapper_execute_handles_mcp_error() -> None:
|
|
from mcp.shared.exceptions import McpError
|
|
|
|
async def get_prompt(name: str, arguments: dict | None = None) -> object:
|
|
raise McpError(code=42, message="invalid argument")
|
|
|
|
wrapper = _make_prompt_wrapper(SimpleNamespace(get_prompt=get_prompt))
|
|
result = await wrapper.execute()
|
|
assert "invalid argument" in result
|
|
assert "code 42" in result
|
|
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_prompt_wrapper_execute_handles_error() -> None:
|
|
async def get_prompt(name: str, arguments: dict | None = None) -> object:
|
|
raise RuntimeError("boom")
|
|
|
|
wrapper = _make_prompt_wrapper(SimpleNamespace(get_prompt=get_prompt))
|
|
result = await wrapper.execute()
|
|
assert result == "(MCP prompt call failed: RuntimeError)"
|
|
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# connect_mcp_servers: resources + prompts integration
|
|
# ---------------------------------------------------------------------------
|
|
|
|
|
|
def _make_fake_session_with_capabilities(
|
|
tool_names: list[str],
|
|
resource_names: list[str] | None = None,
|
|
prompt_names: list[str] | None = None,
|
|
) -> SimpleNamespace:
|
|
async def initialize() -> None:
|
|
return None
|
|
|
|
async def list_tools() -> SimpleNamespace:
|
|
return SimpleNamespace(tools=[_make_tool_def(name) for name in tool_names])
|
|
|
|
async def list_resources() -> SimpleNamespace:
|
|
resources = []
|
|
for rname in resource_names or []:
|
|
resources.append(
|
|
SimpleNamespace(
|
|
name=rname,
|
|
uri=f"file:///{rname}",
|
|
description=f"{rname} resource",
|
|
)
|
|
)
|
|
return SimpleNamespace(resources=resources)
|
|
|
|
async def list_prompts() -> SimpleNamespace:
|
|
prompts = []
|
|
for pname in prompt_names or []:
|
|
prompts.append(
|
|
SimpleNamespace(
|
|
name=pname,
|
|
description=f"{pname} prompt",
|
|
arguments=None,
|
|
)
|
|
)
|
|
return SimpleNamespace(prompts=prompts)
|
|
|
|
return SimpleNamespace(
|
|
initialize=initialize,
|
|
list_tools=list_tools,
|
|
list_resources=list_resources,
|
|
list_prompts=list_prompts,
|
|
)
|
|
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_connect_registers_resources_and_prompts(
|
|
fake_mcp_runtime: dict[str, object | None],
|
|
) -> None:
|
|
fake_mcp_runtime["session"] = _make_fake_session_with_capabilities(
|
|
tool_names=["tool_a"],
|
|
resource_names=["res_b"],
|
|
prompt_names=["prompt_c"],
|
|
)
|
|
registry = ToolRegistry()
|
|
stacks = await connect_mcp_servers(
|
|
{"test": MCPServerConfig(command="fake")},
|
|
registry,
|
|
)
|
|
for stack in stacks.values():
|
|
await stack.aclose()
|
|
|
|
assert "mcp_test_tool_a" in registry.tool_names
|
|
assert "mcp_test_resource_res_b" in registry.tool_names
|
|
assert "mcp_test_prompt_prompt_c" in registry.tool_names
|