Altbots

Not everybody has friends but need a helping hand sometimes. That's why we have altbots! You can invite one of your characters to your party as a bot to lend you a hand but any more than that you'll have to make and use some friends instead. Concider it as a challenge rather a limitation.

These are bots so they are kind of dumb and there are problems with quest proggress (world object looting) etc. You'll probably need to log in on your alt from time to time and in my expperience, you'll do this a lot (maybe I'm the dumb?).
(make sure you're in a safe place when logging out)

Commanding

Hint: Use WoW's macro system to have hotkeys for the most frequently used commands.
For complete list check documentation at GitHub.

Say .playerbots bot add Charactername

Log in specific alt, adding to your party (capitalize first letter)

Say .playerbots bot add *

Log in alts already in your party.

Whisper logout

Logs out your altbot. Automatic when you are logging out.

Whisper give leader

Pass party/raid leadership to player.

The bot handles many things independently: it accepts quests with you, hands over quests with you, chooses useful quest rewards, learns skills from a trainer you talk to, resurrects you, equips and greeds better looted gear...
Most of the manual controlling is done through whispering to your alt. On error they are just silent which can be confusing.

quests all

List current quests.
Handy to see if missing kills/items/etc.

stats

Tell how full bags are and how brogen the gear is

u [game object]

Use game object (link in chat shift-clicking)
Hearth stoning, recepies, quest starters...

los

List objects surrounding in world for usage.

Trading with bot (yes, you just do it, not something you say)

Bot lists their inventory

[item]

Bot gives item to player.
(open trading window first)

food

Open trade view and list all food items.
If trading view was already open, offer all food items to player.
(There's a list of similar keywords somewhere but I can't find it...)

s vendor

Sell all items to vendor. Except food. Bots love food too much.

s food

Sell all food to vendor.

b [item]

Buy item from vendor.

repair

Repair gear at npc.

talents autopick

Choose talents automagically. No idea if the logic is good.

trainer learn

Learn from trainer.
Mostly automagick for class trainers but needed for profession trainers.

talk / accept [quest] / accept *

Questing commands when things don't just-work

home

Make an inn bot's home

release

Release the spirit of your ded altbot.

As you can see, the commands are pretty easy to understand and logical.