Does this assembly come with a core charge?

No. This is a finished loaded knuckle with no core return required—you install it and you're done.

Will I need new brake lines or suspension components to install this?

The knuckle mounts at factory points. Existing brake lines and suspension arms typically transfer over, but always inspect brake hose condition during installation and replace if cracked or leaking.

What tools do I need to swap this in?

Standard suspension tools—socket set, breaker bar, jack and stands. You'll need to remove the wheel, brake caliper, rotor, and tie rod end. A torque wrench is recommended to spec your vehicle's manual on reassembly.