this derivation will be built:
  /nix/store/ib444l6697zihnm4fa9nxxz7cwdll08a-bernstein-3.14.159.drv
this path will be fetched (538.7 KiB download, 3.0 MiB unpacked):
  /nix/store/003xx06jyl6c4csc3ya3n032rn9s0g8z-python3.14-mcp-1.29.0