when Gen AI cites docs that don't exist

Today in AGI: two Claude agents, same annotation, opposite answers. I had a PR touching an ArgoCD PostSync hook. Ordering hooks within a phase needs an annotation, so I asked; Claude Code (Opus 4.8) and Claude in GitHub disagreed: Claude Code: argocd.argoproj.io/hook-weight does not exist. Claude in GitHub: it does exist. Both stated it flatly. So I pushed the GitHub agent, and it doubled down — citing documentation(!): This claim is incorrect. argocd.argoproj.io/hook-weight is a documented ArgoCD annotation for controlling hook execution order within a phase. From the ArgoCD resource hooks documentation: Citing non-existent docs is the clanker equivalent of pulling rank. Confident. Sourced. Wrong. The actual annotation for ordering is argocd.argoproj.io/sync-wave: They are defined by the argocd.argoproj.io/sync-wave annotation. The value is an integer that defines the ordering. metadata: annotations: argocd.argoproj.io/sync-wave: "5" There is no hook-weight. The “documentation” it…