Short answer: you can’t. Prefect’s docs (in 3.x) don’t publish a Sphinx intersphinx inventory (

objects.inv

), so there’s no “good URL” to add to

intersphinx_mapping

. Workable alternatives: - Use Sphinx extlinks to make stable shortcuts to Prefect pages:

# conf.py
  extensions = ["sphinx.ext.extlinks"]
  extlinks = {
      "prefect": ("<https://docs.prefect.io/%s>", ""),      # generic
      "prefectv3": ("<https://docs.prefect.io/v3/%s>", ""), # versioned
  }

Then link like:

See :prefectv3:`concepts/flows` or :prefectv3:`api-ref/flows/flow`.

- Link directly with standard reST links to the docs: - Prefect docs home - Prefect v3 docs If you specifically need cross-refs to Python objects (what intersphinx provides), the Prefect site doesn’t expose that. The usual workaround is to rely on direct page links via

extlinks

as above. If you need more, tell me what objects you want to reference and I can suggest stable target URLs in the v3 docs.