The Book of Occultation — al-Ṭūsī · Hadith 630 (#Ḥadīth #9)
Chapter 47 | False claimants of deputyship of Imam who are also clearly condemned by the Imams
ومنهم أحمد بن هلال الكرخي:
And among them Ahmad Ibn Hilal Karkhi:
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).