Teams

effectadd <who> to team <name>since 1.5.7

Put a player in a team, leaving the one they were in

add player to team "red"

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effectremove <who> from teamsince 1.5.7

Take a player out of their team

remove player from team

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effectremove <who> from team <name>since 1.5.7

The same, but only if they are in that team

remove player from team "red"

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effectset color of team <name> to <colour>since 1.5.7

The colour of names: red, dark_blue, gold, or a code such as "&a"

set color of team "red" to red

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effectset prefix of team <name> to <text> / set suffix of team <name> to <text>since 1.5.7

Text before or after each name

set prefix of team "red" to "&c[Red] "

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effectset friendly fire of team <name> to <true or false>since 1.5.7

Whether team mates can hurt each other

set friendly fire of team "red" to false

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effectdelete team <name>since 1.5.7

Remove a team; its players are in no team afterwards

delete team "red"

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expressionteam of <who>since 1.5.7

The name of a player's team; unset if they have none

if team of player is "red":
    send "&cGo red!"

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expressionplayers of team <name>since 1.5.7

A list of the names in a team, online or not

for each {_mate} in players of team "red":
    send "&cRed team, assemble!" to {_mate}

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Guide and examples

A team colours its players' names in chat, in the tab list and above their heads, and can put a tag in front of them.

on load:
    set color of team "red" to red
    set prefix of team "red" to "&c[Red] "
    set friendly fire of team "red" to false

command /red:
    trigger:
        add player to team "red"
        send "&cYou joined the red team."

Syntax	Effect
`add <who> to team <name>`	Put a player in a team, leaving the one they were in
`remove <who> from team`	Take a player out of their team
`remove <who> from team <name>`	The same, but only if they are in that team
`set color of team <name> to <colour>`	The colour of names: `red`, `dark_blue`, `gold`, or a code such as `"&a"`
`set prefix of team <name> to <text>` / `set suffix of team <name> to <text>`	Text before or after each name
`set friendly fire of team <name> to <true or false>`	Whether team mates can hurt each other
`delete team <name>`	Remove a team; its players are in no team afterwards
`team of <who>`	The name of a player's team; unset if they have none
`players of team <name>`	A list of the names in a team, online or not

A team is created the first time it is used. Names are up to 16 characters.
Teams are kept on the server's main scoreboard, so the server saves them and they survive restarts. Set them up in on load: so that they exist as soon as the script is loaded.
A player is in one team at a time.
Players who have a script sidebar see the same teams; HyperScript copies them onto each sidebar.
A team's colour is what changes the name above a player's head.