I am pretty sure the Ag(s) is the reducing agent
anode reaction: Ag(s)+HCl(aq)⇒H⁺+AgCl(s)+e⁻
which means that H⁺ is the oxidizing agent
cathode reaction: 2H⁺(aq)+2e⁻⇒H₂(g)
and the cell reaction is the combination of the anode and cathode reactions.
cell reaction: 2Ag(s)+2HCl(aq)⇒2AgCl(s)+H₂(g)