RETRACTABLE SYRINGE

The robot has a retractable syringe in its hand which has access to an internal reservoir of toxin in its arm. It can extend the syringe as a swift action but only if it isn’t holding anything in that hand. Attacks with its syringe deals 1d6 piercing damage and automatically injects a toxin into its target. An affected creature can attempt a Fortitude saving throw against the type of toxin used. The reservoir holds up to 4 doses of any injectable toxin; injury-based poisons, drugs, viruses, nanite colonies are just a few of the possibilities.  See the "Afflictions" section in Chapter 11 of the Starfinder Core Rulebook.  The robot is not required to inject toxin while using the syringe as a weapon.