CortexPrism Slack / Discord Channel Adapter

Cortex agent as a bot in Slack and Discord channels — respond to @mentions, send notifications, push daily standup summaries, and trigger workflows directly from chat.

Installation

cortex plugin install cortex-plugin-slack-discord

Or install from local development:

git clone https://github.com/CortexPrism/cortex-plugin-slack-discord.git
cd cortex-plugin-slack-discord
cortex plugin install .

Setup

Slack Setup

1. Go to Slack API Apps
2. Create a new app → From scratch
3. Add OAuth scopes: chat:write, channels:read, channels:history, reactions:write
4. Install to workspace and copy the Bot User OAuth Token (xoxb-...)
5. For Socket Mode (real-time events): Enable Socket Mode, copy the App-Level Token (xapp-...)

Discord Setup

1. Go to Discord Developer Portal
2. Create a new application → Add a bot
3. Under Bot, copy the token
4. Under OAuth2 → URL Generator, select bot + Send Messages + Read Message History
5. Use the generated URL to invite the bot to your server

Configuration

Setting	Type	Default	Description
slackBotToken	string (secret)	—	Slack Bot User OAuth Token (xoxb-...)
slackAppToken	string (secret)	—	Slack App-Level Token for Socket Mode (xapp-...)
discordBotToken	string (secret)	—	Discord bot token from Developer Portal
defaultSlackChannel	string	—	Default Slack channel for standups and notifications
defaultDiscordChannelId	string	—	Default Discord channel ID for standups and notifications
standupTime	string	09:00	UTC time for daily standup (HH:MM)

Tools

Slack

slack_send_message

Send a message to a Slack channel or user.

{
  "channel": "#general",
  "text": "Build *v2.3.1* has been deployed :rocket:",
  "thread_ts": "1234567890.123456"
}

slack_read_channel

Read recent messages from a Slack channel.

{
  "channel": "#engineering",
  "limit": 20
}

slack_list_channels

List all available channels.

{ "types": "public_channel,private_channel" }

slack_add_reaction

Add an emoji reaction to a message.

{
  "channel": "C01234567",
  "timestamp": "1234567890.123456",
  "emoji": "white_check_mark"
}

Discord

discord_send_message

Send a message to a Discord channel.

{
  "channel_id": "123456789012345678",
  "content": "Deploy complete. All tests passing.",
  "embeds": "[{\"title\":\"Build Status\",\"color\":65280}]"
}

discord_read_channel

Read recent messages from a Discord channel.

{
  "channel_id": "123456789012345678",
  "limit": 50,
  "before": "123456789012345678"
}

Cross-Platform

send_daily_standup

Generate and send a daily standup summary.

{
  "platform": "both",
  "custom_message": "Today we shipped the auth refactor and started on the API v2 migration."
}

webhook_listen_status

Check the configuration status of Slack and Discord integrations.

{}

Usage Examples

Daily Standup Automation

> Send the daily standup to both Slack and Discord

send_daily_standup → { platform: "both" }
→ Posted to #daily-standup (Slack) and #standups (Discord)

PR Notifications

> Notify the team about a new PR

slack_send_message → {
  channel: "#engineering",
  text: "New PR for review: <https://github.com/...|Auth Service Refactor> by @alice"
}
→ Message sent with reaction :eyes:

Capabilities

Capability	Purpose
network:fetch	Slack and Discord API access for messaging and channel operations
events:listener	Real-time event handling for bot mentions and interactions

Development

deno task test
deno fmt && deno lint

# Test Slack
cortex plugin call cortex-plugin-slack-discord slack_list_channels '{}'

# Test Discord
cortex plugin call cortex-plugin-slack-discord discord_read_channel '{"channel_id":"123456789012345678"}'

License

MIT

Events

This plugin subscribes to the Cortex event bus for real-time processing:

Event	Purpose
	Trigger notifications when tools complete
	Detect new agent sessions
	Trigger cleanup on session end
	Send standup summaries after agent turns