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In Paperzilla, a canonical paper and a recommendation are not the same thing. A canonical paper is the shared paper record.
  • it has a Paperzilla paper ID
  • it contains the paper metadata itself
  • you open it with pz paper <paper-id>
  • it can be read without logging in
A recommendation is that same paper as it appears inside one of your projects.
  • it has a recommendation ID (project_paper.id / short ID)
  • it includes project-specific context such as relevance, summary, personalized note, and feedback
  • you open it with pz rec <project-paper-id>
  • it requires login because it belongs to one of your projects
You can also bridge between the two: 
pz paper <paper-id> --project <project-id>
That resolves the canonical paper inside one project and shows the recommendation context for that project. This split is important because one canonical paper can appear in multiple projects with different summaries, scores, and feedback.