this derivation will be built:
  /nix/store/lb5yrxvmdqa628zmivl2i5qhainrhphx-bernstein-3.14.159.drv
this path will be fetched (538.7 KiB download, 3.0 MiB unpacked):
  /nix/store/9z445pg4kl1hjp67708zbgbzaa79829c-python3.14-mcp-1.29.0