Convert Task Ideas to Implementation Plans with GPT-4o, Slack & Google Sheets

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Built by Shun Nakayama Shun Nakayama
Created on June 06, 2026

Description

🚀 Turn your random ideas into concrete automation specs

This workflow acts as your interactive "n8n Consultant." Simply write down a rough automation idea in Google Tasks (e.g., "Send weather updates to Telegram"), and the AI will research, design, and send a detailed n8n implementation plan to your Slack.

✨ Why is this workflow special?
Unlike simple notification workflows, this features a Human-in-the-Loop review process. You don't just get a message; you get control.

Regenerate:** Not satisfied with the AI's plan? Click a button in Slack to have the AI rewrite it instantly.
Archive:* Happy with the plan? Click "Approve" to automatically save the detailed specs to *Google Sheets** and mark the task as complete.

How it works
Fetch: The workflow periodically checks a specific Google Tasks list for new ideas.
AI Design: The AI (OpenAI) analyzes your idea and generates a structured plan, including node configuration and potential pitfalls.
Human Review: It sends the plan to Slack with interactive "Approve" and "Regenerate" buttons. The workflow waits for your input.
If Regenerate: The AI re-analyzes the idea and creates a new variation.
If Approve: The workflow proceeds to the next step.
Archive: The approved plan (Title, Nodes, Challenges) is saved to a Google Sheet for future development.
Close: The original Google Task is updated with a "Processed" flag.

How to set up
Google Tasks: Create a new list named "n8n Ideas".
Google Sheets: Create a new sheet with the following headers in the first row (A to H):
Date Added
Idea Title
Status
Recommended Nodes
Key Challenges
Improvement Ideas
Alternatives
Source Task ID
Credentials: Configure credentials for Google Tasks, Google Sheets, OpenAI, and Slack.
Configure Nodes:
[Step 1] Fetch New Ideas: Select your Task list.
[Step 4] Slack — Review & Approve: Select your target channel.
[Action] Archive to Sheets: Select your Spreadsheet and Sheet.
[Close] Mark Task Done: Select your Task list again.

Requirements
Google Tasks account
Google Sheets account
OpenAI API Key
Slack account

Nodes Used (6)

AI Agent
@n8n/n8n-nodes-langchain.agent
Google Sheets
n8n-nodes-base.googleSheets
Google Tasks
n8n-nodes-base.googleTasks
OpenAI Chat Model
@n8n/n8n-nodes-langchain.lmChatOpenAi
Slack
n8n-nodes-base.slack
Structured Output Parser
@n8n/n8n-nodes-langchain.outputParserStructured