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Slack slash commands AI chat bot

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2/3/2026
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This is a response chatbot in public channels through slash commands. I explain more in detail through the YouTube video, but it's only available in Korean.

How it works?

When you request the created slash command in Slack, the request comes to the webhook. Then, the Switch Node branches appropriately according to each slash command request. Here, a slash command called /ask is connected to the chatbot, and the chatbot generates answers to the questions asked. The final node responds to the channel.

Set up steps

  1. Create a Slack app.
  2. Add chat:write permission in Slack OAuth&Permissions>Scopes.
  3. Create a Command in Slack Slash Commands menu and enter the n8n Webhook node's URL.
  4. Complete creating the Slash Commands.
  5. Enter the created command in the Switch node.
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슬래시 커맨드를 통한 공개 채널에서의 응답 챗봇 입니다. 유튜브 영상에 더 자세하게 설명 드립니다.

설명

슬랙에 생성한 슬래시 커맨드를 슬랙에서 요청하면 웹훅에 요청이 들어옵니다. 이후 Switch Node에서 각 슬래시 커맨드의 요청에 따라 알맞게 분기합니다. 여기에서는 /ask​라는 슬래시 커맨드가 챗봇으로 연결되어 있고, 챗봇에서 질문한 내용의 답변을 생성합니다. 마지막 노드에서 채널로 응답을 합니다.

설정 방법

  1. Slack 앱을 만드세요.
  2. Slack OAuth&Permissions>Scopes 에서 chat:write 권한을 추가하세요.
  3. Slack Slash Commands 메뉴에서 Command를 생성하고, n8n Webhook 노드의 url을 입력하세요.
  4. Slash Slash Commands 생성을 완료하세요.
  5. Switch 노드에 생성한 커맨드를 입력하세요.

n8n Slack Slash Commands AI Chat Bot

This n8n workflow enables you to create an AI chat bot accessible directly from Slack using a slash command. It listens for a specific Slack slash command, extracts the user's message, processes it with an OpenAI Large Language Model (LLM), and then posts the AI's response back to Slack.

What it does

  1. Listens for Slack Slash Commands: A Webhook node acts as the entry point, configured to receive incoming requests from a Slack slash command integration.
  2. Determines Action Based on Command: A Switch node evaluates the incoming data to decide if the request is a valid slash command.
  3. Processes with AI (OpenAI Chat Model): If the command is valid, the user's message is passed to a Basic LLM Chain node, which utilizes an OpenAI Chat Model to generate a response.
  4. Posts AI Response to Slack: The generated AI response is then sent back to the Slack channel where the slash command was initiated.

Prerequisites/Requirements

  • n8n Instance: A running n8n instance (self-hosted or cloud).
  • Slack Account: A Slack workspace where you can create a Slack App and configure a slash command.
  • OpenAI API Key: An API key for OpenAI to access their language models. This will be used to configure the "OpenAI Chat Model" node.

Setup/Usage

  1. Import the workflow:
    • Download the provided JSON file.
    • In your n8n instance, go to "Workflows" and click "New".
    • Click the "Import from JSON" button and paste the workflow JSON or upload the file.
  2. Configure Credentials:
    • Slack: You will need to create a Slack credential in n8n. This typically involves creating a Slack App, enabling incoming webhooks or bot tokens, and providing the necessary tokens to n8n.
    • OpenAI: Create an OpenAI credential in n8n by providing your OpenAI API Key.
  3. Configure the Webhook Trigger:
    • Open the "Webhook" node.
    • Set the "Webhook URL" to "POST" method.
    • Copy the generated "Webhook URL".
  4. Configure Slack Slash Command:
    • In your Slack workspace, create a new Slack App or modify an existing one.
    • Go to "Slash Commands" and create a new command (e.g., /ai).
    • Set the "Request URL" to the Webhook URL copied from the n8n "Webhook" node.
    • Configure any other desired settings for your slash command.
  5. Configure the Slack Node:
    • Open the "Slack" node.
    • Select your configured Slack credential.
    • Ensure the "Operation" is set to "Post Message".
    • The message content will be dynamically generated from the AI response.
  6. Configure OpenAI Chat Model:
    • Open the "OpenAI Chat Model" node.
    • Select your configured OpenAI credential.
    • Review and adjust any model parameters (e.g., model name, temperature) as needed.
  7. Activate the Workflow: Once all configurations are complete, activate the workflow in n8n.

Now, when you type your configured slash command (e.g., /ai your question here) in any Slack channel where the app is installed, the workflow will trigger, process your request with AI, and post the answer back to the channel.

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