Pads or pads and rotors?
Pads are probably a 13-14mm wrench or socket. You can use the jack and lug wrench in the trunk.
Rotors too, would be an 18-19mm with sufficient length for leverage.
Vibe is mechanically Toyota. I would expect the front caliper bolt heads to be 14mm and bracket bolts to be 17mm or 19mm. rear caliper bolt heads maybe 12mm or 14mm and bracket bolts 14mm or 17mm. Bracket bolts might have 21mm heads.
Most brake rotors for asian makes have threaded holes to ease rotor removal. The usual size is 8mm diameter by 1.25 thread pitch. Have two of these (or four if you live in a rust prone area) and something to turn them as well as a soft face mallet to remove the rotors unless you're not removing them.
You also need a suitable tool (such as a C-clamp or large pliers or purpose specific tool) for reseting the caliper piston. A toothbruch sized wire brush is good for cleaning the crud from the caliper brackets.
A small prybar or a screwdriver that can substitute for a small prybar is a good thing to have on hand.
If the brakes have been done by someone other than you in the past (even a shop with a decent reputation) you need to be prepared for the bushing on the guide pins (that's the name I like; I hear them called slides a lot) to be swolen. There should be one pin with a rubber bushing at each caliper and one without. Often, the pins will be lubed with an incompatible grease that makes them swell up and the swolen bushing keeps the pin from sliding smoothly. The grommet should be replaced, but in a pinch you can just remove it using a pick, hook, or small screwdriver. Going without the bushing can contribute to brake noise. If the bushing is replaced, it is necessary to remove all of the offending grease. I use solvent and a small round wire brush for this but use what you've got available.