{ "workflow": { "id": 9193, "name": "AI-powered Gmail assistant: send replies by analyzing thread ID with Sonnet 4.5", "views": 348, "recentViews": 0, "totalViews": 348, "createdAt": "2025-10-02T13:13:47.353Z", "description": "This workflow automates **analyzing Gmail threads and drafting AI-powered replies** with the new model Anthropic **Sonnet 4.5**.\n\nThis workflow automates the process of analyzing incoming emails and generating context-aware draft replies by examining the entire email thread.\n\n---\n\n### **Key Advantages**\n\n* ✅ **Time-Saving** – Automates repetitive email replies, reducing manual workload.\n* ✅ **Context-Aware Responses** – Replies are generated using the entire email thread, not just the latest message.\n* ✅ **Smart Filtering** – The classifier prevents unnecessary drafts for spam or promotional emails.\n* ✅ **Human-in-the-Loop** – Drafts are created instead of being sent immediately, allowing manual review and corrections.\n* ✅ **Scalable & Flexible** – Can be adapted to different accounts, reply styles, or workflows.\n* ✅ **Seamless Gmail Integration** – Directly interacts with Gmail threads and drafts via OAuth.\n\n---\n\n### **How it Works**\n\nThis workflow automates the process of analyzing incoming emails and generating context-aware draft replies by examining the entire email thread.\n\n1. **Trigger & Initial Filtering:** The workflow is automatically triggered every minute by the **Gmail Trigger** node, which detects new emails. For each new email, it immediately performs a crucial first step: it uses an AI **Email Classifier** to analyze the email snippet. The AI determines if the email is a legitimate message that warrants a reply (categorized as \"ok\") or if it's spam, a newsletter, or an advertisement. This prevents the system from generating replies for unwanted emails.\n\n2. **Context Aggregation:** If an email is classified as \"ok,\" the workflow fetches the **entire conversation thread** from Gmail using the `threadId`. A **Code Node** then processes all the messages in the thread, structuring them into a consistent format that the AI can easily understand.\n\n3. **AI-Powered Draft Generation:** The structured conversation history is passed to the **Replying email Agent** with **Sonnet 4.5**. This agent, powered by a language model, analyzes the entire thread to understand the context and the latest inquiry. It then drafts a relevant and coherent HTML email reply. The system prompt instructs the AI not to invent information and to use placeholders for any missing details.\n\n4. **Draft Creation:** The final step takes the AI-generated reply and the original email's metadata (subject, recipient, threadId) and uses them to **create a new draft email** in Gmail. This draft is automatically placed in the correct email thread, ready for the user to review and send.\n---\n\n\n### **Set up Steps**\n\nTo implement this automated email reply system, you need to configure the following:\n\n1. **Configure Gmail & OpenAI Credentials:** Ensure the following credentials are set up in your n8n instance:\n * **Gmail OAuth2 Credentials:** The workflow uses the same Gmail account for the trigger, fetching threads, and creating drafts. Configure this in the \"Gmail Trigger,\" \"Get a thread,\" and \"Create a draft\" nodes.\n * **OpenAI API Credentials:** Required for both the \"Email Classifier\". Provide your API key in the respective OpenAI Chat Model nodes.\n \n\t * **Anthropic API Credentials:** Required for the main \"Replying email Agent.\" Provide your API key in the respective Antrhopic Chat Model nodes.\n\n2. **Review AI Classification & Prompting:**\n * **Email Filtering:** Check the categories in the **Email Classifier** node. The current setup marks only non-advertising, non-newsletter emails as \"ok.\" You can modify these categories to fit your specific needs and reduce false positives.\n * **Reply Agent Instructions:** Review the system message in the **Replying email Agent**. You can customize the AI's persona, tone, and instructions (e.g., making it more formal, or instructing it to sign with a specific name) to better align with your communication style.\n\n---\n### **Need help customizing?** \n[Contact me](mailto:info@n3w.it) for consulting and support or add me on [Linkedin](https://www.linkedin.com/in/davideboizza/). \n", "workflow": { "id": "mYOyC65TtRuJhvzs", "meta": { "instanceId": "a4bfc93e975ca233ac45ed7c9227d84cf5a2329310525917adaf3312e10d5462", "templateCredsSetupCompleted": true }, "name": "Send Gmail replies by analyzing Thread ID", "tags": [], "nodes": [ { "id": "c1469689-3e67-4a07-9d5e-374552d164e7", "name": "Gmail Trigger", "type": "n8n-nodes-base.gmailTrigger", "position": [ -464, -272 ], "parameters": { "filters": {}, "pollTimes": { "item": [ { "mode": "everyMinute" } ] } }, "credentials": { "gmailOAuth2": { "id": "credential-id", "name": "gmailOAuth2 Credential" } }, "typeVersion": 1.3 }, { "id": "072aba43-704d-4663-a6e7-a5f7e9ad942d", "name": "Get a thread", "type": "n8n-nodes-base.gmail", "position": [ 128, -64 ], "webhookId": "60401c0b-c333-4db7-aee8-674d15d7c267", "parameters": { "options": { "returnOnlyMessages": true }, "resource": "thread", "threadId": "={{ $json.threadId }}", "operation": "get" }, "credentials": { "gmailOAuth2": { "id": "credential-id", "name": "gmailOAuth2 Credential" } }, "typeVersion": 2.1 }, { "id": "972b0ab6-a6a4-4409-bc7c-4b06f3f06255", "name": "Create a draft", "type": "n8n-nodes-base.gmail", "position": [ 1232, -64 ], "webhookId": "61fada73-17e1-439b-9142-b5c4b0aeb902", "parameters": { "message": "={{ $json.output }}", "options": { "ccList": "={{ $ifEmpty($('Gmail Trigger').item.json.Cc, '') }}", "sendTo": "={{ $('Gmail Trigger').item.json.From }}", "threadId": "={{ $('Gmail Trigger').item.json.threadId }}" }, "subject": "={{ $('Gmail Trigger').item.json.Subject }}", "resource": "draft", "emailType": "html" }, "credentials": { "gmailOAuth2": { "id": "credential-id", "name": "gmailOAuth2 Credential" } }, "typeVersion": 2.1 }, { "id": "9b255334-0339-4d8c-932d-3e7b759476b4", "name": "Merge", "type": "n8n-nodes-base.merge", "position": [ 960, -256 ], "parameters": { "mode": "combine", "options": {}, "combineBy": "combineAll" }, "typeVersion": 3.2 }, { "id": "67777b0c-98d3-46dd-bc8c-036946048aa1", "name": "OpenAI Chat Model1", "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi", "position": [ -304, 144 ], "parameters": { "model": { "__rl": true, "mode": "list", "value": "gpt-5-nano", "cachedResultName": "gpt-5-nano" }, "options": {} }, "credentials": { "openAiApi": { "id": "credential-id", "name": "openAiApi Credential" } }, "typeVersion": 1.2 }, { "id": "7e958566-cf0f-4b20-bb7a-1e5115aa0635", "name": "Email Classifier", "type": "@n8n/n8n-nodes-langchain.textClassifier", "position": [ -224, -64 ], "parameters": { "options": { "fallback": "discard", "enableAutoFixing": true, "systemPromptTemplate": "Please classify the text provided by the user into one of the following categories: {categories}, and use the provided formatting instructions below. Don't explain, and only output the json." }, "inputText": "={{ $json.snippet }}", "categories": { "categories": [ { "category": "ok", "description": "Non-advertising, non-newsletter, non-spam emails that deserve a response" } ] } }, "typeVersion": 1.1 }, { "id": "84a4f669-17af-4dbb-8ccf-660751316e38", "name": "Replying email Agent", "type": "@n8n/n8n-nodes-langchain.agent", "position": [ 560, -64 ], "parameters": { "text": "={{ JSON.stringify($json.data) }}", "options": { "systemMessage": "You are an expert in replying to emails that arrive in my inbox. \nYou will be provided with the conversation history. \nAnalyze it carefully and draft a reply. \n\n- Do not invent information. \n- If some variables are missing or unknown, insert clear placeholders like {{variable}}. \n- Your output must be ONLY the email reply in valid HTML format, without any preamble, notes, or explanations. " }, "promptType": "define" }, "typeVersion": 2.2 }, { "id": "7496e0e8-05d8-4f37-b6a7-abe91d7fea73", "name": "Code", "type": "n8n-nodes-base.code", "position": [ 336, -64 ], "parameters": { "jsCode": "const results = [];\n\nfor (const item of $input.all()) {\n let emails = item.json;\n\n // Normalizza in array:\n if (!emails) {\n emails = [];\n } else if (!Array.isArray(emails)) {\n // Se è avvolto in una proprietà comune\n if (Array.isArray(emails.emails)) {\n emails = emails.emails;\n } else if (Array.isArray(emails.messages)) {\n emails = emails.messages;\n } else if (typeof emails === 'object' && (emails.id || emails.snippet || emails.From || emails.To)) {\n // singolo oggetto email -> mettilo in array\n emails = [emails];\n } else {\n // fallback: non iterabile\n emails = [];\n }\n }\n\n for (const email of emails) {\n results.push({\n snippet: email.snippet ?? '',\n from: email.From ?? email.from ?? '',\n to: email.To ?? email.to ?? '',\n });\n }\n}\n\n// Output unico con proprietà \"data\"\nreturn [\n {\n json: {\n data: results,\n },\n },\n];\n\n\n" }, "typeVersion": 2 }, { "id": "6d5cc052-a0b6-403d-a6ea-efaed97ab351", "name": "Anthropic Sonnet 4.5", "type": "@n8n/n8n-nodes-langchain.lmChatAnthropic", "position": [ 496, 144 ], "parameters": { "model": { "__rl": true, "mode": "list", "value": "claude-sonnet-4-5-20250929", "cachedResultName": "Claude Sonnet 4.5" }, "options": {} }, "credentials": { "anthropicApi": { "id": "credential-id", "name": "anthropicApi Credential" } }, "typeVersion": 1.3 }, { "id": "a9070e89-5e15-4110-b9a7-3f88fdde7990", "name": "Sticky Note", "type": "n8n-nodes-base.stickyNote", "position": [ -480, -848 ], "parameters": { "color": 3, "width": 704, "height": 208, "content": "## AI-Powered Gmail Assistant: send replies by analyzing Thread ID with Sonnet 4.5\n \nThis workflow automates **analyzing Gmail threads and drafting AI-powered replies** with the new model Anthropic **Sonnet 4.5**.\n\nThis workflow automates the process of analyzing incoming emails and generating context-aware draft replies by examining the entire email thread." }, "typeVersion": 1 }, { "id": "9c238691-41c5-4f32-98f6-6ac1239063b1", "name": "Sticky Note1", "type": "n8n-nodes-base.stickyNote", "position": [ -480, -608 ], "parameters": { "width": 704, "height": 224, "content": "## STEP 1\n \n* **Gmail OAuth2 Credentials:** The workflow uses the same Gmail account for the trigger, fetching threads, and creating drafts. Configure this in the \"Gmail Trigger,\" \"Get a thread,\" and \"Create a draft\" nodes.\n * **OpenAI API Credentials:** Required for both the \"Email Classifier\". Provide your API key in the respective OpenAI Chat Model nodes.\n \n * **Anthropic API Credentials:** Required for the main \"Replying email Agent.\" Provide your API key in the respective Antrhopic Chat Model nodes." }, "typeVersion": 1 } ], "active": false, "pinData": {}, "settings": { "executionOrder": "v1" }, "versionId": "9ddd07a7-fb73-4016-b1d1-90e59be8be84", "connections": { "Code": { "main": [ [ { "node": "Replying email Agent", "type": "main", "index": 0 } ] ] }, "Merge": { "main": [ [ { "node": "Create a draft", "type": "main", "index": 0 } ] ] }, "Get a thread": { "main": [ [ { "node": "Code", "type": "main", "index": 0 } ] ] }, "Gmail Trigger": { "main": [ [ { "node": "Merge", "type": "main", "index": 0 }, { "node": "Email Classifier", "type": "main", "index": 0 } ] ] }, "Email Classifier": { "main": [ [ { "node": "Get a thread", "type": "main", "index": 0 } ] ] }, "OpenAI Chat Model1": { "ai_languageModel": [ [ { "node": "Email Classifier", "type": "ai_languageModel", "index": 0 } ] ] }, "Anthropic Sonnet 4.5": { "ai_languageModel": [ [ { "node": "Replying email Agent", "type": "ai_languageModel", "index": 0 } ] ] }, "Replying email Agent": { "main": [ [ { "node": "Merge", "type": "main", "index": 1 } ] ] } } }, "lastUpdatedBy": 29, "workflowInfo": { "nodeCount": 11, "nodeTypes": { "n8n-nodes-base.code": { "count": 1 }, "n8n-nodes-base.gmail": { "count": 2 }, "n8n-nodes-base.merge": { "count": 1 }, "n8n-nodes-base.stickyNote": { "count": 2 }, "n8n-nodes-base.gmailTrigger": { "count": 1 }, "@n8n/n8n-nodes-langchain.agent": { "count": 1 }, "@n8n/n8n-nodes-langchain.lmChatOpenAi": { "count": 1 }, "@n8n/n8n-nodes-langchain.textClassifier": { "count": 1 }, "@n8n/n8n-nodes-langchain.lmChatAnthropic": { "count": 1 } } }, "status": "published", "user": { "name": "Davide", "username": "n3witalia", "bio": "Full-stack Web Developer based in Italy specialising in Marketing & AI-powered automations. For business enquiries, send me an email at info@n3w.it or add me on Linkedin.com/in/davideboizza", "verified": true, "links": [ "https://n3w.it" ], "avatar": "https://gravatar.com/avatar/d41b8a0aa81139243509c58870f5b4be292824a507ab57d10ed066d8628ed8da?r=pg&d=retro&size=200" }, "nodes": [ { "id": 24, "icon": "file:merge.svg", "name": "n8n-nodes-base.merge", "codex": { "data": { "alias": [ "Join", "Concatenate", "Wait" ], "resources": { "generic": [ { "url": "https://n8n.io/blog/how-to-sync-data-between-two-systems/", "icon": "🏬", "label": "How to synchronize data between two systems (one-way vs. two-way sync" }, { "url": "https://n8n.io/blog/supercharging-your-conference-registration-process-with-n8n/", "icon": "🎫", "label": "Supercharging your conference registration process with n8n" }, { "url": "https://n8n.io/blog/migrating-community-metrics-to-orbit-using-n8n/", "icon": "📈", "label": "Migrating Community Metrics to Orbit using n8n" }, { "url": 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