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The Slack Block Kit Sender node sends richly formatted, interactive messages using Slack’s Block Kit framework.

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Channel Access Requirements

To send Block Kit messages to a channel, you must be a member of that channel AND the Gumloop bot must be invited to the channel (unless using “Send as user” mode).
1

Authenticate with Slack

Go to the Credentials page and connect your Slack workspace.
2

Join the Channel

Make sure you’re a member of the channel where you want to send messages. Private channels require an invite from an existing member.
3

Invite the Gumloop Bot

Type /invite @Gumloop in the channel, or click the channel name and select Add integrations/Add app to search for “Gumloop”.
Adding Gumloop app to Slack channel
4

Select the Channel

The channel will now appear in the dropdown menu in the node configuration.
If you enable “Send as user profile” in the node options, the Gumloop bot does not need to be in the channel. The message will be sent using your personal Slack token instead. You still need to be a member of the channel.

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Direct Messages (DMs)

You can send Block Kit messages directly to users by selecting a user from the dropdown or using their user ID.
Block Kit direct message configuration

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When to Use

The Block Kit Sender is ideal for:
Use CaseExample
Structured MessagesVisually appealing messages with headers, sections, and dividers
Interactive ElementsButtons, hyperlinks, and embedded images
Status UpdatesRich formatting for project updates and alerts
Message TemplatesConsistent, reusable message formats

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Node Inputs

InputDescription
ChannelThe Slack channel where the message will be sent
Blocks JSON StringJSON-formatted Block Kit content defining your message layout
Blocks Description (Optional)Text description for accessibility/notifications and mobile push alerts
Thread ID (Optional)For replying in specific threads. Fetch from Slack Message Reader
If you have raw content that needs to be converted to Slack Markdown for Block Kit, use the Generate Report node to automatically format your content.

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Send as User Profile

When enabled under “Show More Options”, this uses your personal Slack token to send messages:
  • The message appears as sent by you, not the Gumloop bot
  • The Gumloop bot does not need to be in the channel
  • You still need to be a member of the channel
  • Useful for personal messaging or when you want messages to appear from your account

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Node Output

OutputDescription
Posted Thread IDThe unique identifier of the sent message thread
Message StatusSuccess/failure of message delivery

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Example Implementations

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1. Project Update Template

Perfect for regular team updates with clear progress indicators. 
[
  {
    "type": "header",
    "text": {
      "type": "plain_text",
      "text": "🚀 Project Update",
      "emoji": true
    }
  },
  {
    "type": "section",
    "text": {
      "type": "mrkdwn",
      "text": "Hello <#C05QUSA4CC9>! Here's your weekly project status:"
    }
  },
  {
    "type": "section",
    "text": {
      "type": "mrkdwn",
      "text": "*Current Progress:*\n• Phase 1: ✅ Complete\n• Phase 2: 🚧 In Progress `(75%)`\n• Phase 3: ⏳ Pending"
    }
  },
  {
    "type": "context",
    "elements": [
      {
        "type": "mrkdwn",
        "text": "📅 Next review: Monday at 10 AM"
      }
    ]
  }
]
Preview:
🚀 Project Update Hello #project-team! Here’s your weekly project status: Current Progress: • Phase 1: ✅ Complete • Phase 2: 🚧 In Progress (75%) • Phase 3: ⏳ Pending 📅 Next review: Monday at 10 AM

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2. Interactive Support Ticket

Useful for creating actionable support tickets with response options. 
[
 {
   "type": "header",
   "text": {
     "type": "plain_text", 
     "text": "🎫 New Support Ticket",
     "emoji": true
   }
 },
 {
   "type": "section",
   "text": {
     "type": "mrkdwn",
     "text": "*Ticket ID:* #1234\n*Priority:* High\n*Reported by:* <@U07L10GLL80>"
   }
 },
 {
   "type": "section", 
   "text": {
     "type": "mrkdwn",
     "text": "*Issue Description:*\n```Unable to access production database. Error occurs during authentication.```"
   }
 },
 {
   "type": "actions",
   "elements": [
     {
       "type": "button",
       "text": {
         "type": "plain_text",
         "text": "View Details",
         "emoji": true
       },
       "url": "https://www.gumloop.com/",
       "value": "view_1234"
     }
   ]
 },
 {
   "type": "context",
   "elements": [
     {
       "type": "mrkdwn",
       "text": "🕐 Reported: 2024-11-26 14:30 UTC"
     }
   ]
 }
]
Preview:
🎫 New Support Ticket Ticket ID: #1234 Priority: High Reported by: @Sarah Issue Description: Unable to access production database. Error occurs during authentication. [View Details] 🕐 Reported: 2024-11-26 14:30 UTC

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3. Performance Report Template

Great for sharing metrics and achievements in a structured format. 
[
  {
    "type": "header",
    "text": {
      "type": "plain_text",
      "text": "📊 Q4 Performance Report",
      "emoji": true
    }
  },
  {
    "type": "section",
    "text": {
      "type": "mrkdwn",
      "text": "*Team Lead:* <@U07L10GLL80> | *Department:* <#C05QUSA4CC9>"
    },
    "accessory": {
      "type": "image",
      "image_url": "https://i.sstatic.net/JOiNx.png",
      "alt_text": "Team performance graph"
    }
  },
  {
    "type": "divider"
  },
  {
    "type": "section",
    "text": {
      "type": "mrkdwn",
      "text": "*Key Metrics:*\n```• Revenue: $1.2M (+15%)\n• Customer Growth: 2.5k (+30%)\n• Response Time: 2h (-50%)```"
    }
  },
  {
    "type": "section",
    "text": {
      "type": "mrkdwn",
      "text": "*Team Achievements:*\n• Launched 5 major features\n• Reduced bug backlog by 40%\n• Achieved 99.9% uptime"
    }
  }
]
Preview:
📊 Q4 Performance Report Team Lead: @Sarah | Department: #sales-team [Graph Image] Key Metrics: 
• Revenue: $1.2M (+15%)
• Customer Growth: 2.5k (+30%)
• Response Time: 2h (-50%)
Team Achievements: • Launched 5 major features • Reduced bug backlog by 40% • Achieved 99.9% uptime

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Common Use Cases

  1. Automated Alerts
    • System status updates
    • Performance monitoring alerts
    • Security notifications
    • Deployment status messages
  2. Team Communication
    • Sprint updates
    • Meeting summaries
    • Project milestones
    • Team announcements
  3. Interactive Workflows
    • Approval requests
    • Incident management
    • Task assignments
  4. Data Visualization
    • Performance metrics via graphs
    • Analytics reports
    • Usage statistics
    • Health checks

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Important Considerations

  1. Authentication: Set up Slack authentication in the Credentials page
  2. Channel Membership: You must be a member of the channel for it to appear in the dropdown
  3. Gumloop Bot Required: The Gumloop bot must be invited to the channel using /invite @Gumloop (unless using “Send as user profile”)
  4. Send as User: When enabled, the bot is not required - messages are sent using your personal token
  5. JSON Testing: Validate layouts in Block Kit Builder
  6. Loop Mode: Use Loop Mode for sending multiple messages

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Advanced Slack Features

Need more advanced Slack capabilities like managing channels, uploading files, or adding reactions? Use the Slack MCP node to create custom Slack integrations with natural language prompts.

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Learn More