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The Slack Canvas Writer node creates and shares formatted documents in Slack channels and threads using Slack’s Canvas feature.

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Channel Access Requirements

To post canvases to a channel, you must be a member of that channel AND the Gumloop bot must be invited to the channel.
1

Authenticate with Slack

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

Join the Channel

Make sure you’re a member of the channel where you want to post canvases. 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.

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Node Inputs

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Node Output

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Key Features

  • Markdown formatting support for rich content
  • Thread reply capabilities for contextual discussions
  • Loop Mode support for creating multiple canvases
  • Configurable access levels for collaboration

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When to Use

The Slack Canvas Writer is ideal for sharing well-formatted content:

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Example Implementation

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Weekly Status Report

Preview in Slack Canvas:

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🎯 Week 47 Team Update

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Key Achievements

  • Launched v2.1 of the API
  • Reduced load times by 40%
  • Onboarded 3 new enterprise clients

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Project Status

API v2.1 ✅ Done - Released on Tuesday Mobile App 🚧 80% - Testing in progress Analytics ⏳ 45% - Dependencies blocking

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Next Week’s Goals

  1. Complete mobile app testing
  2. Start analytics dashboard
  3. Plan v2.2 features

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Reminders

  • Team meeting moved to 2 PM on Tuesday
  • Submit expense reports by Friday
  • Holiday schedule planning starts next week

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Questions or Issues?

Reach out in the thread below! 👇

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Important Considerations

  1. Authentication: Set up Slack authentication in the Connectors 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
  4. Thread Replies: When replying to threads, ensure the channel matches the original message
  5. Loop Mode: Use Loop Mode for creating multiple canvases

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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