this derivation will be built:
  /nix/store/fihl6vqywmlvc12i020m6dln9n6df72c-bernstein-3.19.2.drv
this path will be fetched (538.7 KiB download, 3.0 MiB unpacked):
  /nix/store/r0mak9qgafj593wgzmifjma5lvbgf1wm-python3.14-mcp-1.29.0