slack

name	slack
description	Manage Slack channels, messages, users, reactions and files via Bot API
user-invocable	true
argument-hint	["action or channel name"]

/slack

Connect to Slack to manage channels, send messages, browse history, list users, add reactions, pin messages, upload files and search across your workspace. Pure Ruby, zero gems — stdlib only.

Structure

scripts/
├── auth.rb            # Bearer token auth + slack_request helper (required by all scripts)
├── check_setup.rb     # Check if token exists (outputs OK or SETUP_NEEDED)
├── save_token.rb      # Save and validate a Bot token
├── channels.rb        # List channels in the workspace
├── channel_info.rb    # Get info about a channel
├── post_message.rb    # Post a message to a channel
├── messages.rb        # Get message history for a channel
├── users.rb           # List users in the workspace
├── user_info.rb       # Get info about a user
├── add_reaction.rb    # Add a reaction to a message
├── remove_reaction.rb # Remove a reaction from a message
├── pins.rb            # List pinned messages in a channel
├── pin_message.rb     # Pin a message in a channel
├── upload_file.rb     # Upload file content to a channel
└── search_messages.rb # Search messages across the workspace

Setup (check before using)

ruby ~/.claude/skills/slack/scripts/check_setup.rb

If the output is OK, proceed to the Flow section.

If the output is SETUP_NEEDED, guide the user step by step. Present ONE step at a time, wait for the user to confirm before moving to the next.

Step 1 — Ask the user to create a Slack app and get the Bot token:

You need a Slack Bot User OAuth Token. Go to the Slack API portal: https://api.slack.com/apps

1. Click Create New App > From scratch, give it a name and select your workspace
2. Go to OAuth & Permissions in the left menu
3. Under Bot Token Scopes, add the following scopes:
   • channels:read
   • channels:history
   • chat:write
   • users:read
   • reactions:write
   • pins:write
   • files:write
   • search:read
4. Click Install to Workspace at the top and authorize
5. Copy the Bot User OAuth Token (starts with xoxb-)

Paste the bot token here.

Step 2 — When the user pastes the token, save it:

ruby ~/.claude/skills/slack/scripts/save_token.rb 'PASTED_TOKEN'

If the script outputs an error, the token is invalid. Ask the user to double-check and try again.

If setup is not complete, DO NOT proceed to the Flow. Complete all steps first.

Flow

The argument $ARGUMENTS may contain a channel name or action reference.

Step 1: List channels

ruby ~/.claude/skills/slack/scripts/channels.rb
ruby ~/.claude/skills/slack/scripts/channels.rb --limit 50
ruby ~/.claude/skills/slack/scripts/channels.rb --types public_channel,private_channel

Present the channels. Ask which channel to work with if needed.

Step 2: Actions

Get channel info:

ruby ~/.claude/skills/slack/scripts/channel_info.rb CHANNEL_ID

Read messages:

ruby ~/.claude/skills/slack/scripts/messages.rb CHANNEL_ID
ruby ~/.claude/skills/slack/scripts/messages.rb CHANNEL_ID --limit 50

Post a message (requires user confirmation):

Show the message content first, then ask to confirm before sending.

ruby ~/.claude/skills/slack/scripts/post_message.rb CHANNEL_ID "Hello from HiTank!"

List users:

ruby ~/.claude/skills/slack/scripts/users.rb
ruby ~/.claude/skills/slack/scripts/users.rb --limit 50

Get user info:

ruby ~/.claude/skills/slack/scripts/user_info.rb USER_ID

Add a reaction (requires user confirmation):

ruby ~/.claude/skills/slack/scripts/add_reaction.rb CHANNEL_ID TIMESTAMP thumbsup

Remove a reaction (requires user confirmation):

ruby ~/.claude/skills/slack/scripts/remove_reaction.rb CHANNEL_ID TIMESTAMP thumbsup

List pinned messages:

ruby ~/.claude/skills/slack/scripts/pins.rb CHANNEL_ID

Pin a message (requires user confirmation):

ruby ~/.claude/skills/slack/scripts/pin_message.rb CHANNEL_ID TIMESTAMP

Upload a file (requires user confirmation):

ruby ~/.claude/skills/slack/scripts/upload_file.rb CHANNEL_ID "file content here" --filename notes.txt --title "My Notes"

Search messages:

ruby ~/.claude/skills/slack/scripts/search_messages.rb "search query"
ruby ~/.claude/skills/slack/scripts/search_messages.rb "search query" --count 10

Notes

• Pure Ruby, zero gems — stdlib only (json, net/http, uri, fileutils)
• Auth via Bot User OAuth Token (Authorization: Bearer xoxb-...)
• Token file: ~/.config/slack/token (outside the repo, never commit)
• Posting messages, adding/removing reactions, pinning, and uploading files require explicit user confirmation
• Mention users as <@USER_ID> in message content
• Slack API returns {"ok": true/false} — all scripts check data['ok'] and output errors
• The search:read scope is required for search_messages.rb
• Base URL: https://slack.com/api