AI Prompt Hub (Notion + ChatGPT): Auto-Find the Right Prompt with Embeddings

Overview

Build your own AI Prompt Hub inside n8n.
This template lets ChatGPT automatically search your saved prompts in Notion using semantic embeddings from HuggingFace. Each time a user sends a message, the workflow finds the most relevant prompt based on meaning - not keywords.

Perfect for developers who maintain dozens of prompts and want ChatGPT to pick the right one automatically.

Key Features

• 🔍 Semantic Prompt Search - Finds the best prompt using HuggingFace embeddings
• 🧠 AI Agent Integration - ChatGPT automatically calls the prompt-search workflow
• 📚 Notion Prompt Database - Store unlimited prompts with auto-generated embeddings
• ⚡ Automatic Embedding Sync - Regenerates vectors when prompts change

This template is ideal for:

• AI automations
• Prompt engineering
• DevOps and backend engineers who reuse prompts
• Teams managing large prompt libraries

How it works

1. The user sends any message to the ChatGPT interface
2. The n8n AI Agent calls a sub-workflow that performs semantic search in Notion
3. HuggingFace converts both the message and saved prompts into vector embeddings
4. The workflow returns the most similar prompt, which ChatGPT can use automatically

Setup Instructions (15–20 minutes)

1. Import this template into your n8n instance
2. Set credentials for Notion, OpenAI, and HuggingFace
3. Create a Notion database with:
   • Prompt (Text)
   • Embeddings (Text)
   • Checksum (Text)
4. Paste your Notion database ID in:
   • “Get All Prompts”
   • “On Page Update”
   • “On Page Create”
   • “Get All Prompts for Search”
5. Enable the workflow and open the URL from “When chat message received” to start chatting
6. Type any request - the system will search for a matching prompt automatically

Documentation & Demo

Full documentation and examples:
https://github.com/YahorDubrouski/ai-planner/blob/main/documentation/prompt-hub/README.md