Slack

Slack Advanced Operations

Advanced Slack operations beyond basic messaging.

Available Tools

• message: Send messages to Slack channels
• slack_actions: Slack-specific operations
• web_fetch: Access Slack Web API

Slack Web API

Base URL: https://slack.com/api/

Common Operations

Post Message

POST https://slack.com/api/chat.postMessage
Headers:
  Authorization: Bearer {SLACK_BOT_TOKEN}
Body: {
  "channel": "C1234567890",
  "text": "Message text",
  "blocks": [...]
}

Upload File

POST https://slack.com/api/files.upload
Body: {
  "channels": "C1234567890",
  "content": "file content",
  "filename": "file.txt"
}

List Channels

GET https://slack.com/api/conversations.list

Get Channel History

GET https://slack.com/api/conversations.history?channel={channel_id}

Add Reaction

POST https://slack.com/api/reactions.add
Body: {
  "channel": "C1234567890",
  "timestamp": "1234567890.123456",
  "name": "thumbsup"
}

Block Kit

Slack supports rich message formatting with Block Kit:

blocks = [
    {
        "type": "section",
        "text": {"type": "mrkdwn", "text": "*Bold text*"}
    },
    {
        "type": "actions",
        "elements": [
            {
                "type": "button",
                "text": {"type": "plain_text", "text": "Click Me"},
                "action_id": "button_click"
            }
        ]
    }
]

Usage Examples

User: "Send a formatted message to #general"

1. Build blocks with Block Kit
2. POST to chat.postMessage

User: "Upload this file to Slack"

1. Read file content
2. POST to files.upload

User: "List all channels in workspace"

1. GET conversations.list
2. Format and present

Environment Setup

export SLACK_BOT_TOKEN="xoxb-..."

Get token from: https://api.slack.com/apps

Required Scopes

• chat:write - Send messages
• files:write - Upload files
• channels:read - List channels
• reactions:write - Add reactions