Automate Slack + Trello
Team chat where operations actually surface. Boards and cards — simple enough to automate deeply. Put an agent between them and the hand-off stops being manual: it reads, decides, acts, and shows its work.
Support First Responder is a ready-made agent built around Slack; point its last step at Trello to finish this hand-off.
Automations teams run
Unlike field-mapping automation, the step in the middle is an agent: it can summarise, classify, judge and draft, not merely copy values from Slack into Trello.
When a message hits a channel in Slack…
…an agent can create and move cards in Trello — after reading the context and deciding it should.
When a keyword or mention fires in Slack…
…an agent can update checklists and labels in Trello — after reading the context and deciding it should.
When a reaction is added in Slack…
…an agent can summarise a board in Trello — after reading the context and deciding it should.
When a card is created or moved in Trello…
…an agent can post a rich channel message in Slack — with the reasoning recorded in the run’s receipt.
When a due date approaches in Trello…
…an agent can DM a teammate in Slack — with the reasoning recorded in the run’s receipt.
When a checklist completes in Trello…
…an agent can open a thread with findings in Slack — with the reasoning recorded in the run’s receipt.
Copy this Slack → Trello workflow
Start with the slack-api node and a custom-api call to api.trello.com. Configure the Slack source payload, the agent input, and the Trello operation. The sequential template does not implement conditional writes or approval by itself.
This is a schema-checked starting point, not an end-to-end tested automation. Replace every CONFIGURE_ value, choose the operations you intend, connect credentials and map source outputs into later inputs. An edge orders steps; it does not supply a condition, an approval gate or a field mapping. Add and test those controls explicitly before any write. Cloud APIs and model providers may receive data. Keep the workflow inactive until tested with fixtures.
{
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"name": "Slack → Trello",
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"text": "Watch Slack",
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"y": 144,
"isEditing": false,
"type": "receive-slack-message",
"icon": "connect",
"category": "trigger",
"isSelected": false,
"parameters": {
"channelId": "CONFIGURE_CHANNELID"
},
"description": "Setup template for Receive Slack Message. Listen for incoming Slack messages in a specified channel and trigger the workflow when a new message is received. Configure credentials, inputs and output mapping before use.",
"error": null,
"isActive": false,
"output": null,
"outputs": {}
},
{
"id": "438babb9-8c19-4c16-a163-47732ef3ec34",
"text": "Review source and draft",
"x": 512,
"y": 336,
"isEditing": false,
"type": "agnt-agent",
"icon": "connect",
"category": "action",
"isSelected": false,
"parameters": {
"agentId": "CONFIGURE_AGENTID",
"message": "Read the Slack item. Decide whether it warrants action in Trello, and explain why.\nSource input: CONFIGURE_SOURCE_INPUT. Produce a reviewable draft only; do not take external actions."
},
"description": "Setup template for Agent Chat. Chat with an AI agent from your agent library. Select an agent and send messages to interact with it within your workflow. Configure credentials, inputs and output mapping before use.",
"error": null,
"isActive": false,
"output": null,
"outputs": {}
},
{
"id": "8ca79983-bd76-497f-af92-e6524829fac6",
"text": "Call Trello",
"x": 512,
"y": 528,
"isEditing": false,
"type": "custom-api",
"icon": "connect",
"category": "action",
"isSelected": false,
"parameters": {
"url": "https://api.trello.com/1/cards?key={key}&token={token}",
"method": "GET",
"authType": "None",
"query": "",
"headers": "{}"
},
"description": "Setup template for Custom API Request. This action node makes a custom API request to any endpoint with configurable method, headers, and authentication. Configure credentials, inputs and output mapping before use.",
"error": null,
"isActive": false,
"output": null,
"outputs": {}
}
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"zoomLevel": 1,
"canvasOffsetX": 0,
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"isTinyNodeMode": false
}Configure Receive Slack Message
Listen for incoming Slack messages in a specified channel and trigger the workflow when a new message is received.
- channelId — The ID of the Slack channel to monitor Current example:
CONFIGURE_CHANNELID.
Configure Custom API Request
This action node makes a custom API request to any endpoint with configurable method, headers, and authentication.
- url — The URL of the API endpoint Current example:
https://api.trello.com/1/cards?key={key}&token={token}. - method — The HTTP method for the request Current example:
GET. - authType — The type of authentication Current example:
None. - query — Query parameters for the request (e.g., 'key1=value1&key2=value2') Current example:
. - headers — Optional headers for the request. e.g., {"Content-Type": "application/json"} Current example:
{}.
Install Support First Responder
Support First Responder is a working agent built around Slack. Install it, point its last step at Trello, and you have this hand-off without building it from an empty canvas.
Runs on your own machine · See what it does
Wiring Slack to Trello
- Install AGNT — it runs on your own machine and needs no account to start.
- Authorise Trello (an API key pasted into the vault) and Slack (one OAuth sign-in). Nothing is stored anywhere but your disk.
- Describe the job in plain language, or paste the definition above; slack-api does the reading and custom-api the writing.
- Gate anything you would not want done unattended, then let it run and read the first receipt end to end.
Slack and Trello — common questions
Can I connect Slack to Trello without writing code?
You can build it entirely from the canvas. Authorise Slack with one OAuth sign-in, Trello with an API key pasted into the vault, then tell the agent what pipe agent findings into the room where decisions happen should look like once Trello is involved. Code is an option for the unusual cases, never a requirement for the common ones.
How is this different from a field-mapping Slack to Trello automation?
The difference shows up on the messy inputs. A rule chain needs every case enumerated in advance; an agent handles pipe agent findings into the room where decisions happen the way a colleague would — reading the Slack context, judging it, then writing to Trello with the reasoning recorded.
Does my Slack and Trello data leave my machine?
Not to us. AGNT runs locally and both sets of credentials are encrypted on your own disk. Outbound traffic goes only to Slack, Trello and whichever model you chose — and pointing that at Ollama or LM Studio keeps everything on your hardware.
What does a Slack and Trello run leave behind?
You get an auditable trail rather than a success flag. It shows the Slack context the agent worked from, the judgment it made about email requests become cards instantly, and the exact change applied in Trello, with approvals attached where you required them.
