Surgical instrument with lockout features

A surgical instrument, comprising:

• a handle assembly;
• a shaft assembly extending distally from the handle assembly;
• and
• an end effector assembly coupled to the handle assembly via the shaft assembly, the end effector assembly being configured to be manipulated by the handle assembly to transit between an open configuration and a closed configuration, wherein the end effector assembly comprises:
• a pair of hook-shaped members,
• a pair of closure plates positioned between the pair of hook-shaped members, the pair of closure plates being configured to be manipulated by the handle assembly to advance distally to thereby convert the end effector assembly from the open configuration to the closed configuration,
• a firing bar positioned between the pair of closure plates, the firing bar being configured to be manipulated by the handle assembly to advance distally, and
• a lockout assembly, the lockout assembly being pivotally mounted on the pair of closure plates and positioned therebetween, the lockout assembly being configured to pivot between a locked position in which the lockout assembly is configured to prevent the pair of closure plates and the firing bar from advancing distally, and an unlocked position in which the lockout assembly is configured to allow the pair of closure plates and the firing bar to advance distally.