this derivation will be built:
  /nix/store/49ydmqw9d6y63kx1w991nvn0fx5y3acf-bernstein-3.7.1.drv
this path will be fetched (524.9 KiB download, 2.9 MiB unpacked):
  /nix/store/ciwxy63s3dz4yg941wh3yhq55c9rjclx-python3.14-mcp-1.27.1