You can find more information on MCMMO at http://mcmmo.wikia.com/wiki/McMMO_WikiAlchemy
/mcability - Toggles whether or not you can activate abilities with rightclick
/mcmmo - Displays general mcMMO help text.
/mcstats - Displays the current level of the player's skills.
/[skillname] - Displays information on a specific skill.
/inspect [player name] - Displays the mcMMO stats of the player provided if you are close enough.
Unleash your inner brewer!
Tired of your wolves being pathetic? Well now it’s time for you to stop being such a pathetic beast handler and increase your skill in Taming. Taming increases by engaging in combat with your tamed wolves. Levels of Taming will offer benefits to your wolves such as damage reduction versus explosions, fire, fall damage, and all incoming damage. Offensive skills that increase the damage of the wolves and offer critical strike chance and a DoT applied to foes unlucky enough to be "gored" by your wolves.
Excavation skill increases the more you dig materials like clay, dirt, sand, gravel and anything else that you dig mainly with a shovel. The higher your excavation, the greater the reward you can revive. Lower level excavation can get you green and yellow disks, but the higher you go you can get diamonds and rare materials like cobwebs!
Mining increases depending on the materials you mine. Mining ores will give much more XP than just mining stone. How much XP depends entirely on the rarity of the ore. Diamond and lapis give the highest XP. High skill levels give blocks the chance to drop double the normal items, get this high enough and it will be guaranteed.
It’s finally time to show the tree huggers whose boss, cutting down trees is the only way to level this currently. With high woodcutting you can get leaf blower which destroys leaves with one touch of an axe, and tree feller that makes a whole tree fall down! Higher skill levels will allow a double drop to happen, and if your skill is high enough it will be guaranteed.
Thousands of days of being obsessed with dwarven craftsmanship will finally pay off, gained by reforging old and battered equipment, this skill helps the player use less resources when repairing with an anvil. Anvils are constructed via 9 Iron Ingots in a crafting table (Iron Block).
Punching the hell out of monsters will gain you experience, but you shalt not be rewarded from abusing farm animals. Really, where’s the fun in taking out your aggression on Pigs? With this skill players can actually make unarmed useful for combat, great for combat even. Get this high enough and you can disarm what other players are holding and drop it to the ground.
Shooting arrows was cool in vanilla minecraft... for about 5 minutes, this skill is looking to change that as archery will let your damage increase at higher levels, and you can eventually daze players providing a very beneficial pvp benefit. Higher levels of archery will let you retrieve arrows from corpses.
This one is for the harvest moon fans, picking herbs up (flowers, mushrooms) and harvesting crops will help raise this skill. Its benefits include double drops from farming and increasing the effectiveness of bread and stew.
This will give you even more reason to stab monsters between the eyes. Gaining skill in swords will help your swordsmanship of course, allowing you to counter an enemy's attack, damaging them whenever they damage you. Make everyone afraid to even get near you! High levels of Swords will also let your gouge your enemies and bleed them to death.
Embrace your inner viking with the axes skill. No longer are axes just for obsessively chopping down forests. With the axes skill, players will be able to do critical hits, instantly killing monsters and causing severe damage to players. As your skill increases, your chance to critically strike will too. At a certain skill level Axes damage will even be upgraded. What axe you use matters for the damage scaling, use a Diamond Axe for maximum damage.
Finally the days of spraining your ankle have paid off, no longer will you look down a 100 meter drop with fear. With the acrobatics skill your ability to negate fall damage increases. And how do you negate fall damage? By rolling of course, a secret passed down through the ages. Tap into this mysterious 'rolling' ability by falling and training your body. If you're good enough you will never have to worry about fall damage again.
Fishing allows you to increase treasure finding rate, increase the amount of fish caught, find different traps and treasures, shake loot off of mobs, increase the amount of hunger fish restore, and make holes in ice to fish through.