Add lita-triage-slack to your Lita instance's Gemfile:

gem "lita-triage-slack"

Generate a slack API oAuth token for a user (since your slack token is for a bot, which can't create/archive/etc channels). Set the config key for it in your lita_config.rb, along with the usernames you'd like to invite to the triage channel when it's created.

config.handlers.triage_slack.token = 'whatever'
config.handlers.triage_slack.users = [ 'Igneous', 'Freud' ]

@bot: redalert on Shit's goin down
bot: #triage is now active, all hands to battle stations, standby phasers

@bot: redalert off
bot: #triage is archived, standing down red alert, return to normal duty

MIT