Test Failure Analysis

(Updated to reflect latest run: 24256002384)

Summary: TestMCPConfig::test_run_mcp_config in the newly added tests/cli/test_run.py timed out on Windows — it spawns a real Python subprocess that can't start within the 5-second unit-test timeout.

Root Cause: test_run_mcp_config creates a StdioMCPServer(command="python", args=[str(script_path)]) and then connects to it via a FastMCP proxy client. This spawns a real subprocess that must import fastmcp and start an MCP server. On Windows CI, subprocess startup + module loading regularly exceeds 5 seconds. All Linux runners passed because the same operation is faster there.

Suggested Solution: Move TestMCPConfig::test_run_mcp_config to the integration test suite (or give it an explicit longer timeout marker). The simplest fix is to mark only that test:

@pytest.mark.integration  # spawns a real subprocess
async def test_run_mcp_config(self, tmp_path: Path):
    ...

…or add @pytest.mark.timeout(30) so it isn't killed by the 5-second unit-test ceiling. The sibling test test_validate_mcp_config is fine in the unit suite since it never spawns a process.

tests\cli\test_run.py ........+++++++++++++++++++++++++++++++++++ Timeout +++++++++++++++++++++++++++++++++++

File "C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\selectors.py", line 315, in _select
    r, w, x = select.select(r, w, w, timeout)
+++++++++++++++++++++++++++++++++++ Timeout +++++++++++++++++++++++++++++++++++

mcp_config = MCPConfig(
    mcpServers={
        "test_server": StdioMCPServer(command="python", args=[str(script_path)])
    }
)
...
client = Client[FastMCPTransport](server)
async with client:
    tools = await client.list_tools()   # triggers subprocess spawn
    assert len(tools) == 1