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<svg viewBox='0 0 48 48' xmlns='http://www.w3.org/2000/svg' role='img' aria-label='Slack glyph'><rect x='5' y='7' width='26' height='21' rx='6' fill='none' stroke='currentColor' stroke-width='3'/><path d='M12 30v5l7-7' fill='none' stroke='currentColor' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/><rect x='24' y='21' width='19' height='16' rx='5' fill='none' stroke='currentColor' stroke-width='3'/><path d='M39 39v4l-6-6' fill='none' stroke='currentColor' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/></svg>
Post to Slack when a Trello card is blocked
Filter on the list that means trouble and the channel hears the second a card lands there, with the members, the deadline and a link to the card.
Trigger: Card moved between lists
Action: Post a message to a channel
About 4 minutes to set up
How this flow works
Syncline watches Trello for Card moved between lists. When that happens it runs Post a message to a channel in Slack with the fields you mapped.
- Connect Trello and name the destination list worth shouting about.
- Choose the Slack channel and invite Syncline to it.
- Write the alert so it names the card, the people on it and the deadline.
- Drag one card into that list, read the post, then turn the flow on.
Field mapping
| From Trello | To Slack | Note |
|---|---|---|
| Card name | Message text | The card title opens the message, which is what people scan for before they read anything else. |
| List | Channel | Cards landing in Blocked go to one channel and cards landing in Done to another, from a single flow. |
| Members | Message text | Card members are mentioned by name once Syncline matches their address to a Slack account. |
| Due date | Message text | The deadline is written in the reader timezone, so nobody does the arithmetic in their head. |
Why teams run it
- Blocked work surfaces in minutes, not at the next standup
- The people on the card get mentioned, so it has an owner
- The board stays the source and chat stays the notice board
Who uses it
A delivery manager who cannot watch the board all day but is always in the channel.
About the two apps
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Trello
Trello is the task board people actually keep updated, because moving a card takes one second. Syncline creates those cards from other systems and reports back when they move.
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Slack
Slack is where a team notices things, which makes it the best place to put an alert and the worst place to store one. Syncline sends messages into channels when something happens elsewhere, and turns the replies worth keeping into records.
Questions
Can I alert on moves out of a list too?
Yes. Both the origin and the destination list are available on the trigger, so you can catch work leaving review as easily as work entering it.
How do I avoid a message on every small drag?
Filter on the destination list. Most boards have two lists worth announcing and four that nobody outside the team needs to hear about.
Related combinations
Connect Trello and Slack
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