How to Broadcast Trello Project Updates to Slack with Power Automate

My flows > + New flow > Automated cloud flow

Create automated cloud flow

Navigate to make.powerautomate.com and sign in with your Microsoft account. Click 'My flows' in the left sidebar, then hit the '+ New flow' button. Select 'Automated cloud flow' from the dropdown menu. Name your flow 'Trello to Slack Status Updates' and leave the trigger selection for the next step.

1. 1Click 'My flows' in the left navigation
2. 2Click '+ New flow' at the top
3. 3Select 'Automated cloud flow'
4. 4Enter 'Trello to Slack Status Updates' as the flow name
5. 5Click 'Create' without selecting a trigger

Flow designer > Trigger > Search connectors

Add Trello webhook trigger

Click on the trigger step and search for 'Trello' in the connector search box. Select the 'When a card is updated (V2)' trigger from the Trello connector. This trigger fires in real-time when cards move between lists or receive comments. You'll need to authenticate with your Trello account if this is your first time connecting.

1. 1Click the trigger step box
2. 2Type 'Trello' in the search bar
3. 3Select the Trello connector
4. 4Choose 'When a card is updated (V2)' trigger
5. 5Click 'Sign in' and authorize Power Automate to access Trello

Trello trigger > Configuration

Configure board and trigger conditions

Select the Trello board you want to monitor from the Board dropdown. Leave List blank to monitor all lists on the board. In the 'Trigger on' field, select both 'Card moved' and 'Comment added' to capture status changes and new comments. This ensures your team gets notified for both workflow movements and communication updates.

1. 1Click the Board dropdown and select your project board
2. 2Leave the List field empty for all-list monitoring
3. 3Check both 'Card moved' and 'Comment added' in Trigger on
4. 4Set 'Include card details' to Yes for full data access

Flow designer > + New step > Control > Condition

Add condition to filter relevant updates

Click '+ New step' and search for 'Condition' under the Control connector. This step prevents spam by filtering which card movements actually need Slack notifications. You'll create logic to only notify when cards move to specific lists like 'Review', 'Done', or 'Blocked' rather than every minor change.

1. 1Click '+ New step' below the Trello trigger
2. 2Search for 'Control' and select it
3. 3Choose 'Condition' from the actions list
4. 4Click in the left value box to see dynamic content

Condition > Configure logic

Set up list-based filtering logic

In the condition's left box, select 'List Name After' from the Trello dynamic content. Set the operator to 'is equal to' and enter 'Review' in the right box. Click 'Add row' to add another condition with 'List Name After' equals 'Done'. Set the logic to 'Or' so notifications fire when cards move to either list.

1. 1Click the left value box and select 'List Name After'
2. 2Keep 'is equal to' as the operator
3. 3Type 'Review' in the right value box
4. 4Click 'Add row' to add another condition
5. 5Set the new condition to 'List Name After' equals 'Done'
6. 6Change the condition logic from 'And' to 'Or'

Condition > Yes branch > Add an action > Slack

Add Slack post message action

In the 'Yes' branch of the condition, click 'Add an action' and search for 'Slack'. Select 'Post message' from the Slack connector actions. You'll need to authenticate with Slack and grant Power Automate permission to post messages to your workspace channels.

1. 1Click 'Add an action' in the Yes branch
2. 2Search for 'Slack' in the connector search
3. 3Select the Slack connector
4. 4Choose 'Post message' from the actions
5. 5Sign in to your Slack workspace when prompted

Slack action > Channel and Message configuration

Configure channel routing

Click the Channel dropdown and select the Slack channel where project updates should appear. For the Message text, you'll build a formatted notification using Trello dynamic content. Start with a clear subject line that includes the card name and new status, followed by relevant details like assignee and due date.

1. 1Select your target channel from the Channel dropdown
2. 2Click in the Message text box
3. 3Type ':point_right: Card Updated: '
4. 4Insert 'Card Name' from dynamic content
5. 5Add a new line and insert 'List Name After'
6. 6Include 'Card URL' for easy access

Condition > No branch > Add action > Control > Condition

Add comment-specific notification path

Go back to step 4 and click 'Add an action' in the 'No' branch of the condition. Add another Condition to check if the trigger was a comment addition. Set the condition to 'Action Type' equals 'commentCard' from the Trello dynamic content. This creates a separate notification path for comments versus card movements.

1. 1Click 'Add an action' in the No branch
2. 2Search for 'Control' and add another Condition
3. 3Select 'Action Type' in the left value box
4. 4Set operator to 'is equal to'
5. 5Type 'commentCard' in the right value

Comment condition > Yes branch > Slack > Post message

Configure comment notifications

In the comment condition's Yes branch, add another Slack 'Post message' action. Select the same channel but customize the message format for comments. Include the commenter's name, card name, and a preview of the comment text to give context without requiring people to click through to Trello.

1. 1Add a Slack 'Post message' action in the Yes branch
2. 2Select the same channel as before
3. 3Format message as ':speech_balloon: New Comment: '
4. 4Insert 'Card Name' from dynamic content
5. 5Add 'Comment Text' field
6. 6Include 'Member Creator Full Name' for attribution

Flow designer > Save > Test

Test and activate the flow

Click 'Save' in the top right to save your flow. Navigate to your Trello board and move a test card to the Review list, then add a comment to another card. Check your Slack channel within 30 seconds to verify both notification types work. If successful, your flow will continue running automatically for all future card updates.

1. 1Click 'Save' in the top toolbar
2. 2Go to your Trello board in another tab
3. 3Drag a card to the Review list
4. 4Add a comment to any card
5. 5Check your Slack channel for both notifications

Use this Power Fx expression in the Slack message field to create smart notifications that include different details based on whether it's a weekend or weekday update.

if(
  weekday(utcNow()) in [1, 7],
  concat(

if(
  weekday(utcNow()) in [1, 7],
  concat(
    ':calendar: **Weekend Update:** ',
    triggerBody()?['card']?['name'],
    '\nStatus: ', triggerBody()?['list']?['name'],
    '\n:warning: Non-urgent - review Monday'
  ),
  concat(
    ':point_right: **Card Updated:** ',
    triggerBody()?['card']?['name'],
    '\nNew Status: ', triggerBody()?['list']?['name'],
    '\nBy: ', triggerBody()?['memberCreator']?['fullName'],
    '\nView: ', triggerBody()?['card']?['shortUrl']
  )
)