TriggerTrelloReal-timeUpdated May 2026
How do I trigger when a member is added to a Trello card?
Short answer: Drop the "Trello → Member Added to Card" trigger on your workflow canvas, add filters if you want them, and publish. It fires within seconds of the event in Trello, not on a polling schedule.
Anatomy
What this trigger looks like in a workflow.
Drop it on the canvas. Configure a couple of fields. Publish.
In the builder
Trigger
Member Added to Card
When the matching event happens
when a member is added to a trello cardwhen member added to cardnew member added to cardwatch for member added to cardon member added to card
What this trigger returns
for the curiousYou don’t need to read this. Tiny Command auto-maps every field into the visual picker so downstream nodes can pull values by clicking. We show it here for power users who want to know what’s on the wire.
{"card": "Sample Card","board": "Project Board","event": "addMemberToCard"}
Output shape
Fields available to downstream nodes.
Every field below can be referenced by name in any action or filter that comes after this trigger.
| Field | Type | Example |
|---|---|---|
| card | string | "Sample Card" |
| board | string | "Project Board" |
| event | string | "addMemberToCard" |
Pairs with
Drop these actions after Member Added to Card.
FAQ
Questions about Member Added to Card.
How does the Member Added to Card trigger work in Trello?
Fires when a member is added to a Trello card. Common use: DM the new assignee with context, log the change, or auto-add them to related cards.
Is the Member Added to Card trigger real-time?
Yes. Member Added to Card uses webhooks or push subscriptions, not polling. Your workflow fires within seconds of the event happening in Trello.
What data does Member Added to Card return?
The full event payload from Trello. The output shape table on this page lists every field, its type, and an example value so you can map fields into downstream nodes.
Can I filter Member Added to Card so only some events start a workflow?
Yes. Add a Filter node right after the trigger and match on any field, whether that's subject, sender, status, or anything else in the payload. Workflows only continue when the filter passes.
Do I need Trello admin permissions to use Member Added to Card?
For most Trello accounts a standard user can authorize the trigger. Some Trello plans require an admin to enable third-party webhooks. Check Trello's docs if the trigger fails to register.
More triggers
Other Trello triggers.
Trigger
Attachment Added
Fires when an attachment is added to a Trello card. Use to copy the file to S3/Drive for backup, virus-scan, or to extract text for downstream processing.
TriggerNew Card
Fires when a new card is created on a Trello board. The standard inbound hook for AI triage, auto-assignment, or external mirroring.
TriggerCard Moved
Fires when a card is moved between lists on a Trello board (the classic Kanban-stage-change event). Use to celebrate completion, log cycle-time, or kick off downstream work.
TriggerCard Updated
Fires whenever any field on a Trello card changes (name, description, due date, labels, members, custom fields). Combine with a field filter to react only to specific changes.
TriggerComment Added
Fires when a comment is added to a Trello card. Use to mirror discussion to Slack, alert the assignee, or extract AI sentiment.
Build a workflow on this trigger.
One trigger. 21+ downstream actions. Zero glue.
