Cogtail, the Automaton Monkey

Clockwork Precision: The automaton monkey has advantage on Dexterity (Acrobatics) checks.

Mimicry: Cogtail can mimic simple sounds it has heard, such as a person whispering, a baby crying, or an animal chittering. A creature that hears the sounds can tell they are imitations with a successful DC 13 Wisdom (Insight) check.

Rechargeable Core: Once per short rest, Cogtail can channel the energy from its power core to restore 10 hit points to itself or another construct within 5 feet.

Multiattack: Cogtail makes two attacks: one with its bite and one with its tail.

Bite: Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage.

Tail Swipe: Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) bludgeoning damage, and the target must succeed on a DC 13 Dexterity saving throw or be knocked prone.

Arcane Discharge: As a bonus action, Cogtail can release a burst of magical energy stored in its core. Each creature within 10 feet of the automaton must succeed on a DC 13 Dexterity saving throw or take 7 (2d6) lightning damage. Once used, this ability can't be used again until the automaton finishes a long rest.

Infiltrator Mode: As a bonus action, Cogtail can compress its body and disguise itself as a common clockwork toy or small mechanical device. While disguised, it has advantage on Dexterity (Stealth) checks to hide and can eavesdrop on conversations, transmitting the information telepathically to its owner within a range of 120 feet. However, while in Infiltrator Mode, it cannot attack or use its Arcane Discharge ability.

Distracting Chatter: Cogtail emits a series of distracting and confusing sounds. As a bonus action, it can target one creature within 30 feet that can hear it. The target must succeed on a DC 13 Wisdom saving throw or have disadvantage on its next attack roll or ability check.