What can I automate with Slack in Sim?

With Sim you can: Send Message; Send Ephemeral Message; Create Canvas; Read Messages; Get Message; and 18 more tools. Each action runs inside an AI agent block, so you can combine Slack with LLM reasoning, conditional logic, and data from any other connected service.

How do I connect Slack to Sim?

Getting started takes under five minutes: (1) Create a free account at sim.ai. (2) Open a new workflow. (3) Drag a Slack block onto the canvas. (4) Authenticate with one-click OAuth — no credentials to copy-paste. (5) Choose the tool you want to use, wire it to the inputs you need, and click Run. Your automation is live.

Can I use Slack as a tool inside an AI agent in Sim?

Yes — this is one of Sim's core capabilities. Instead of hard-coding when and how Slack is used, you give an AI agent access to Slack tools and describe the goal in plain language. The agent decides which tools to call, in what order, and how to handle the results. This means your automation adapts to context rather than breaking when inputs change.

How do I send message with Slack in Sim?

Add a Slack block to your workflow and select "Send Message" as the tool. Fill in the required fields — you can reference outputs from earlier steps, such as text generated by an AI agent or data fetched from another integration. No code is required.

How do I trigger a Sim workflow from Slack automatically?

In your Sim workflow, switch the Slack block to Trigger mode and copy the generated webhook URL. Paste that URL into Slack's webhook settings and select the events you want to listen for (Slack Webhook). From that point on, every matching event in Slack instantly fires your workflow — no polling, no delay.

What data does Sim receive when a Slack event triggers a workflow?

When Slack fires a webhook, Sim receives the full event payload that Slack sends — typically the record or object that changed, along with metadata like the event type and timestamp. Inside your workflow, every field from that payload is available as a variable you can pass to AI agents, conditions, or other integrations.

What Slack tools does Sim support?

Sim supports 23 Slack tools: Send Message, Send Ephemeral Message, Create Canvas, Read Messages, Get Message, Get Thread, List Channels, List Channel Members, List Users, Get User Info, Download File, Update Message, Delete Message, Add Reaction, Remove Reaction, Get Channel Info, Get User Presence, Edit Canvas, Create Channel Canvas, Open View, Update View, Push View, Publish View.

Is the Slack integration free to use?

Yes — Sim's free plan includes access to the Slack integration and every other integration in the library. No credit card is needed to get started. Visit sim.ai to create your account.

Integration

Slack

Send, update, delete messages, manage views and modals, add or remove reactions, manage canvases, get channel info and user presence in Slack

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Overview

Integrate Slack into the workflow. Can send, update, and delete messages, send ephemeral messages visible only to a specific user, open/update/push modal views, publish Home tab views, create canvases, read messages, and add or remove reactions. Requires Bot Token instead of OAuth in advanced mode. Can be used in trigger mode to trigger a workflow when a message is sent to a channel.

How to automate Slack with Sim

Create a free account
Sign up at sim.ai in seconds. No credit card required. Your workspace is ready immediately.
Add a Slack block
Open a workflow, drag a Slack block onto the canvas, and connect your account with one-click OAuth.
Configure, connect, and run
Pick the tool you need, wire in an AI agent for reasoning or data transformation, and run. Your Slack automation is live.

Real-time triggers

Connect a Slack webhook to Sim and your workflow fires the instant an event happens — no polling, no delay. Sim receives the full event payload and makes every field available as a variable inside your workflow.

Event
Slack Webhook
Trigger workflow from Slack events like mentions, messages, and reactions

Workflow templates

Ready-to-use workflows featuring Slack. Click any to build it instantly.

Supported tools

23 Slack tools available in Sim

Send Message
Send Ephemeral Message
Create Canvas
Create and share Slack canvases in channels. Canvases are collaborative documents within Slack.
Read Messages
Get Message
Retrieve a specific message by its timestamp. Useful for getting a thread parent message.
Get Thread
Retrieve an entire thread including the parent message and all replies. Useful for getting full conversation context.
List Channels
List all channels in a Slack workspace. Returns public and private channels the bot has access to.
List Channel Members
List all members (user IDs) in a Slack channel. Use with Get User Info to resolve IDs to names.
List Users
List all users in a Slack workspace. Returns user profiles with names and avatars.
Get User Info
Get detailed information about a specific Slack user by their user ID.
Download File
Download a file from Slack
Update Message
Delete Message
Add Reaction
Remove Reaction
Get Channel Info
Get detailed information about a Slack channel by its ID
Get User Presence
Check whether a Slack user is currently active or away
Edit Canvas
Edit an existing Slack canvas by inserting, replacing, or deleting content
Create Channel Canvas
Create a canvas pinned to a Slack channel as its resource hub
Open View
Open a modal view in Slack using a trigger_id from an interaction payload. Used to display forms, confirmations, and other interactive modals.
Update View
Update an existing modal view in Slack. Identify the view by view_id or external_id, and provide the updated view payload.
Push View
Push a new view onto an existing modal stack in Slack. Limited to 2 additional views after the initial modal is opened.
Publish View
Publish a static view to a user

Frequently asked questions

Sim's Slack integration lets you build AI-powered workflows that automate tasks in Slack without writing code. Send, update, delete messages, manage views and modals, add or remove reactions, manage canvases, get channel info and user presence in Slack You can connect Slack to hundreds of other services in the same workflow — from CRMs and spreadsheets to messaging tools and databases.

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