these 3 derivations will be built:
  /nix/store/argcswg1g2zqr7rr0dhn5jxkf3wnhppy-source.drv
  /nix/store/6zw0pc2mj8dm3ni7n1ghhyx3x064g1wy-agentty-0.9.9.drv
  /nix/store/ssiyfglmwp042il9cy6wja48v4yrzbqn-check-agentty.drv