Hello! I wanted to try something like this: --8<---------------cut here---------------start------------->8--- (use-modules (guix ci)) (list (channel-with-substitutes-available %default-guix-channel "https://ci.guix.gnu.org") (channel-with-substitutes-available (channel (name 'guix-hpc) (url "https://gitlab.inria.fr/guix-hpc/guix-hpc.git")) "https://guix.bordeaux.inria.fr")) --8<---------------cut here---------------end--------------->8--- However, that doesn’t work because ‘channel-with-substitutes-available’ looks for a ‘guix.x86_64-linux’ job, which doesn’t exist on this Cuirass instance. Wouldn’t it be enough to look for the latest completed evaluation (of a given jobset)? Incidentally, it seems ‘complete?’ is always false: --8<---------------cut here---------------start------------->8--- scheme@(guix ci)> (latest-evaluations "https://guix.bordeaux.inria.fr" 10) $16 = (#< id: 88628 spec: "guix-past" complete?: #f checkouts: (#< commit: "065d2cd6ced96ddb38c15a46f798488f61660a33" channel: "guix">)> #< id: 88627 spec: "guix-hpc" complete?: #f checkouts: (#< commit: "065d2cd6ced96ddb38c15a46f798488f61660a33" channel: "guix">)> #< id: 88584 spec: "guix-past" complete?: #f checkouts: (#< commit: "fd5527407ff336c4af1c5511e19c0956720cd7aa" channel: "guix">)> #< id: 88583 spec: "guix-hpc" complete?: #f checkouts: (#< commit: "fd5527407ff336c4af1c5511e19c0956720cd7aa" channel: "guix">)> #< id: 88470 spec: "guix-past" complete?: #f checkouts: (#< commit: "2710df38b0c317bdc69c61c7775d8141eb214dd1" channel: "guix">)> #< id: 88469 spec: "guix-hpc" complete?: #f checkouts: (#< commit: "2710df38b0c317bdc69c61c7775d8141eb214dd1" channel: "guix">)> #< id: 88442 spec: "guix-past" complete?: #f checkouts: (#< commit: "83d21785a9fbc6a7e87435d437b2b3917f3a3b09" channel: "guix">)> #< id: 88441 spec: "guix-hpc" complete?: #f checkouts: (#< commit: "83d21785a9fbc6a7e87435d437b2b3917f3a3b09" channel: "guix">)> #< id: 88186 spec: "guix-past" complete?: #f checkouts: (#< commit: "061823da03add693df9c411fee9ccdcc7291f0ec" channel: "guix">)> #< id: 88185 spec: "guix-hpc" complete?: #f checkouts: (#< commit: "061823da03add693df9c411fee9ccdcc7291f0ec" channel: "guix">)>) --8<---------------cut here---------------end--------------->8--- Thoughts? Ludo’.