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Server-side 2026-07-28 stateless support: classifier, driver split, server/discover (#2928)

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Max 2026-06-21 19:34:17 +01:00 • committed by GitHub
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15
tests/client/test_list_roots_callback.py
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@ -4,7 +4,8 @@ from pydantic import FileUrl
from mcp import Client
from mcp.client import ClientRequestContext
from mcp.server.mcpserver import Context, MCPServer
from mcp.types import ListRootsResult, Root, TextContent
from mcp.shared.exceptions import MCPError
from mcp.types import INVALID_REQUEST, ListRootsResult, Root, TextContent
@pytest.mark.anyio
@ -37,10 +38,10 @@ async def test_list_roots_callback():
assert isinstance(result.content[0], TextContent)
assert result.content[0].text == "true"
# Test without list_roots callback
# Without a list_roots callback the client responds with an MCPError, which the
# tool body doesn't catch — the wrapper re-raises it as a top-level JSON-RPC
# error rather than wrapping it as an isError result.
async with Client(server) as client:
# Make a request to trigger sampling callback
result = await client.call_tool("test_list_roots", {"message": "test message"})
assert result.is_error is True
assert isinstance(result.content[0], TextContent)
assert result.content[0].text == "Error executing tool test_list_roots: List roots not supported"
with pytest.raises(MCPError) as exc_info:
await client.call_tool("test_list_roots", {"message": "test message"})
assert exc_info.value.error.code == INVALID_REQUEST