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"""Test MCP server exposing a small in-memory filesystem.
Usage:
python scripts/filesystem_server.py # stdio transport
python scripts/filesystem_server.py streamable-http # HTTP transport
"""
from pathlib import Path
from mcp.server.fastmcp import FastMCP
mcp = FastMCP("memory_fs")
_ROOT = Path(".mcp_test_fs")
def _ensure_root() -> None:
_ROOT.mkdir(parents=True, exist_ok=True)
@mcp.tool()
def read_file(path: str) -> str:
"""Read a text file from the test filesystem."""
_ensure_root()
target = (_ROOT / path).resolve()
try:
target.relative_to(_ROOT.resolve())
except ValueError as exc:
raise ValueError("path must stay inside the test filesystem") from exc
if not target.exists():
return ""
return target.read_text(encoding="utf-8")
@mcp.tool()
def write_file(path: str, content: str) -> str:
"""Write a text file to the test filesystem."""
_ensure_root()
target = (_ROOT / path).resolve()
try:
target.relative_to(_ROOT.resolve())
except ValueError as exc:
raise ValueError("path must stay inside the test filesystem") from exc
target.parent.mkdir(parents=True, exist_ok=True)
target.write_text(content, encoding="utf-8")
return f"written {len(content)} chars to {path}"
@mcp.tool()
def list_files() -> list[str]:
"""List files in the test filesystem."""
_ensure_root()
return [str(p.relative_to(_ROOT)) for p in _ROOT.rglob("*") if p.is_file()]
if __name__ == "__main__":
import sys
transport = sys.argv[1] if len(sys.argv) > 1 else "stdio"
port = int(sys.argv[2]) if len(sys.argv) > 2 else 9000
mcp.settings.port = port
mcp.run(transport=transport)
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