{"workflow":{"id":12440,"name":"Generate Lookio RAG-backed Gmail drafts from incoming emails with GPT-4.1","views":0,"recentViews":0,"totalViews":0,"createdAt":"2026-01-03T23:19:55.997Z","description":"This n8n template automatically generates knowledge-backed draft email replies when a new message arrives in a connected **Gmail** account. The workflow extracts a clean question from the incoming email using an LLM, queries a **[Lookio](https://lookio.app/)** assistant (your RAG knowledge base) for verified context, then writes a subject and body draft with an AI writer and saves it as a **Gmail draft** so a human agent can review and send.\n\nWatch the full tutorial here: https://www.youtube.com/watch?v=VLz3pCXDGd4&t=1s\n\n## Who is this for?\n\n* **Customer support teams:** Produce fast, fact-based draft replies for support tickets referencing internal docs.\n* **Sales teams:** Auto-generate informed responses to product or pricing questions using your product docs.\n* **Ops & onboarding teams:** Create consistent, accurate answers to frequent procedural questions.\n* **No-code automators:** Quickly add RAG-backed email automation without building your own retrieval stack.\n\n## What it does / What problem does this solve?\n\n* **Saves time:** Reduces manual drafting by producing a polished draft a human can review and send.\n* **Ensures factual answers:** Uses your Lookio assistant so replies are grounded in your uploaded documents and resources.\n* **Maintains human oversight:** Messages are created as **Gmail drafts** (not sent) so agents can edit tone and details.\n* **Flexible filtering:** You can restrict which emails trigger the template (labels, senders, or patterns) to avoid unnecessary drafts.\n\n## How it works\n\n1. **Trigger:** **New email incoming** (Gmail Trigger) detects a new message.\n2. **Clean question:** **OpenAI Chat Model** formats the email into a concise question for lookup.\n3. **RAG lookup:** **Lookio API call** posts the question to your Lookio Assistant and returns research-backed output.\n4. **Draft generation:** **Write email draft** LLM composes an email subject and body based on the Lookio output.\n5. **Save draft:** **Create email draft** (Gmail node) saves the message as a draft in the original thread.\n\n## How to set up\n\n1. **Create a Lookio assistant:** Sign up at [https://lookio.app/](https://lookio.app/) and upload your documents (PDFs, DOCX, CSV, text, URLs). Create an assistant and copy its **Assistant ID** and your workspace **API Key**.\n2. **n8n credentials:** Add **Gmail OAuth2** credentials in n8n for the Gmail trigger and Gmail node, and add your **OpenAI** (or other LLM) credentials for the LLM nodes.\n3. **Configure the nodes:**\n   1. In **New email incoming** (Gmail Trigger) pick poll method or label filters if needed.\n   2. In **Formulate question for knowledge base** (LLM) adjust the prompt if you want different question extraction rules.\n   3. In **Lookio API call** (HTTP Request) replace `&lt;YOUR-API-KEY&gt;` and `&lt;YOUR-ASSISTANT-ID&gt;` placeholders and set desired **query_mode** (`eco`, `flash`, or `deep`).\n   4. In **Write email draft** (LLM) confirm the output parser and desired style/tone.\n   5. In **Create email draft** (Gmail) confirm **threadId** mapping and recipient extraction; the node saves as **draft** by default.\n4. **Activate workflow:** Enable the workflow in n8n and test by sending a sample email to the connected Gmail account.\n\n## Requirements\n\n* An n8n instance with access to the workflow editor\n* A **Gmail** account connected via **Gmail OAuth2** credentials\n* A Lookio account with an assistant, plus **API Key** and **Assistant ID**\n* An AI provider account (OpenAI or equivalent) for the LLM nodes\n\n## What is Lookio and how it provides answers\n\n**Lookio** is an API-first RAG platform that converts uploaded documents into assistants your workflows can query. Upload PDFs, DOCX, CSVs, or paste text, then create an assistant with instructions and resource access. Use the Lookio API (`POST https://api.lookio.app/webhook/query`) with `assistant_id`, `query`, and `query_mode` (`eco`, `flash`, `deep`) to retrieve sourced, context-aware answers. Lookio offers a free trial with credits—visit https://lookio.app/ to sign up and get started.\n\n## How to take it further\n\n* **Selective triggers:** Only trigger on specific labels, senders, or keywords to limit drafts to high-value emails.\n* **Auto-categorization:** Add an LLM classification step to detect whether an email requires RAG or a short reply.\n* **Alternate channels:** Replace the Gmail trigger with Slack, Intercom, or a webhook to draft responses for other channels.\n* **Audit & logging:** Add an **Airtable** or **Google Sheets** node to log queries, Lookio outputs, draft versions and agent actions.\n* **Custom tone & templates:** Add a step that maps customer segments to different reply styles or templates before creating the draft.\n\n","workflow":{"nodes":[{"id":"3a2ecd35-aded-4d69-be94-9c606113fe87","name":"Lookio API 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base","type":"@n8n/n8n-nodes-langchain.chainLlm","position":[48,0],"parameters":{"text":"=Subject: {{ $json.subject }}\n\nBody:\n{{ $json.text }}","batching":{},"messages":{"messageValues":[{"message":"=Based on the user message that's the full content of an email, return a clean formatted question that should be asked to the knowledge base so we get enough context to prepare a response to this email.\n\nYour output is strictly the question (e.g. \"When is the meeting XYZ\" or \"What is the process to ....\")."}]},"promptType":"define"},"typeVersion":1.8},{"id":"a1761abb-e43e-4df8-8603-0ba825d3857f","name":"New email incoming","type":"n8n-nodes-base.gmailTrigger","position":[-240,0],"parameters":{"simple":false,"filters":{},"options":{},"pollTimes":{"item":[{"mode":"everyMinute"}]}},"credentials":{"gmailOAuth2":{"id":"eUroUymrBvR1pmfh","name":"Gmail account Guillaume"}},"typeVersion":1.3},{"id":"dbb4b322-232a-4c0a-b74b-c92dbfd4f42e","name":"Structured Output Parser","type":"@n8n/n8n-nodes-langchain.outputParserStructured","position":[1008,208],"parameters":{"jsonSchemaExample":"{\n  \"Email body\": \"Dear ..., \\nLorem ipsum...\\nBest regards\",\n  \"Email subject\": \"Lorem ipsum\"\n}"},"typeVersion":1.3},{"id":"c45272bf-dac3-4244-9b46-f1dfd84f2384","name":"Write email draft","type":"@n8n/n8n-nodes-langchain.chainLlm","position":[848,0],"parameters":{"text":"=Subject:  \n{{ $('New email incoming').item.json.subject }}\n\nBody:\n\n{{ $('New email incoming').item.json.text }}","batching":{},"messages":{"messageValues":[{"message":"=## Role\n\nYour role is to write an email to respond to the email provided by the user message and base your answer on the research that had been done.\nReturn email subject and body.\n\n## Research\n\nResearch question:\n{{ $('Formulate question for knowledge base').item.json.text }}\n\nRetrieved research context:\n\n{{ $json.Output }}"}]},"promptType":"define","hasOutputParser":true},"typeVersion":1.8},{"id":"35ae860f-2e9e-435f-a230-02e735e08a14","name":"Create email draft","type":"n8n-nodes-base.gmail","position":[1296,0],"webhookId":"c1f3a053-2de9-45ef-8d65-ace645c71c05","parameters":{"message":"={{ $json.output['Email body'] }}","options":{"sendTo":"={{ $('New email incoming').item.json.from.value[0].address }}","threadId":"={{ $('New email incoming').item.json.threadId }}"},"subject":"={{ $json.output['Email subject'] }}","resource":"draft"},"credentials":{"gmailOAuth2":{"id":"eUroUymrBvR1pmfh","name":"Gmail account Guillaume"}},"typeVersion":2.2},{"id":"23aa3ef7-392d-431f-866c-2ee50951c5be","name":"Sticky Note1","type":"n8n-nodes-base.stickyNote","position":[384,-144],"parameters":{"color":3,"width":352,"height":320,"content":"## Retrieving content from your knowledge base (Lookio)\nAction required: Make sure to set your Lookio API key and workspace ID in here."},"typeVersion":1},{"id":"f43d9217-6a16-44fb-b072-4a86d5f63b6f","name":"Sticky Note","type":"n8n-nodes-base.stickyNote","position":[-912,-384],"parameters":{"width":544,"height":960,"content":"# Auto-create Lookio-backed Gmail drafts\n\nQuick summary: When a new email arrives, this workflow extracts a clear question, queries your **Lookio** assistant for sourced context, then drafts a reply (subject + body) and saves it as a **Gmail draft** for human review.\n\nHow it works (short):\n1. **New email incoming** → 2. **Formulate question for knowledge base** (LLM) → 3. **Lookio API call** → 4. **Write email draft** (LLM) → 5. **Create email draft** (Gmail)\n\nHow to set up (do these first):\n1. Create a Lookio assistant at https://lookio.app/ and upload your docs. Copy **API Key** and **Assistant ID**.\n2. Add **Gmail OAuth2** credentials to n8n and connect your Gmail account.\n3. Add **OpenAI** (or other LLM) credentials for the LLM nodes.\n4. In **Lookio API call** node replace `<YOUR-API-KEY>` and `<YOUR-ASSISTANT-ID>` and choose **query_mode** (`eco`/`flash`/`deep`).\n5. Optionally restrict the **New email incoming** trigger with labels or filters.\n\nTips: Drafts are not sent automatically—agents can edit and send. Replace Gmail with other channels if needed.\n\n*A template created by Guillaume Duvernay*\n\n\n## [Video Tutorial](https://youtu.be)\n@[youtube](VLz3pCXDGd4)\n"},"typeVersion":1},{"id":"27536573-deb2-4f53-a0aa-f14f1be86cdc","name":"Sticky Note2","type":"n8n-nodes-base.stickyNote","position":[-320,-144],"parameters":{"color":7,"width":272,"height":320,"content":"## When you receive new emails"},"typeVersion":1},{"id":"e4e31836-7e35-4695-b3c3-277bdf2e79aa","name":"Sticky Note3","type":"n8n-nodes-base.stickyNote","position":[0,-144],"parameters":{"color":7,"width":336,"height":320,"content":"## AI formulates a question from your knowledge base"},"typeVersion":1},{"id":"34e25432-4b22-4ddb-9940-c932d348ac7c","name":"Sticky Note4","type":"n8n-nodes-base.stickyNote","position":[784,-144],"parameters":{"color":7,"width":336,"height":320,"content":"## AI writes the email and subject\nBased on the content we've just retrieved & the original email."},"typeVersion":1},{"id":"7585213d-5d5b-4406-9758-7d2f2771c309","name":"Sticky Note5","type":"n8n-nodes-base.stickyNote","position":[1168,-144],"parameters":{"color":7,"width":336,"height":320,"content":"## Creating the draft in Gmail"},"typeVersion":1}],"connections":{"Lookio API call":{"main":[[{"node":"Write email draft","type":"main","index":0}]]},"OpenAI Chat Model":{"ai_languageModel":[[{"node":"Formulate question for knowledge base","type":"ai_languageModel","index":0},{"node":"Write email draft","type":"ai_languageModel","index":0}]]},"Write email draft":{"main":[[{"node":"Create email draft","type":"main","index":0}]]},"New email incoming":{"main":[[{"node":"Formulate question for knowledge base","type":"main","index":0}]]},"Structured Output Parser":{"ai_outputParser":[[{"node":"Write email draft","type":"ai_outputParser","index":0}]]},"Formulate question for knowledge base":{"main":[[{"node":"Lookio API call","type":"main","index":0}]]}}},"lastUpdatedBy":1,"workflowInfo":{"nodeCount":13,"nodeTypes":{"n8n-nodes-base.gmail":{"count":1},"n8n-nodes-base.stickyNote":{"count":6},"n8n-nodes-base.httpRequest":{"count":1},"n8n-nodes-base.gmailTrigger":{"count":1},"@n8n/n8n-nodes-langchain.chainLlm":{"count":2},"@n8n/n8n-nodes-langchain.lmChatOpenAi":{"count":1},"@n8n/n8n-nodes-langchain.outputParserStructured":{"count":1}}},"status":"published","readyToDemo":null,"user":{"name":"Guillaume Duvernay","username":"duv","bio":"AI and automation 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