AI Gmail Reply Agent with Calendar Check

The workflow JSON

Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →

{
  "meta": {
    "templateCredsSetupCompleted": true
  },
  "nodes": [
    {
      "id": "eaa31cde-3017-400d-aac8-999def8cc227",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -340,
        -780
      ],
      "parameters": {
        "width": 617,
        "height": 490,
        "content": "## Check if incoming email is about appointment\nWe use LLM to check subject and body of the email and determine if it's an appointment request. "
      },
      "typeVersion": 1
    },
    {
      "id": "b03d3f72-d1d8-49a7-bcc1-a476fd5c4ad7",
      "name": "Sticky Note1",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        400,
        -780
      ],
      "parameters": {
        "width": 796,
        "height": 482,
        "content": "## Get calendar availability and compose a response\nMake sure to update the Workflow ID if you are running this as 2 workflows"
      },
      "typeVersion": 1
    },
    {
      "id": "29ce0093-c4c8-41cc-be69-334de3a1d1a2",
      "name": "OpenAI Chat Model",
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "position": [
        -60,
        -460
      ],
      "parameters": {
        "model": {
          "__rl": true,
          "mode": "list",
          "value": "gpt-4o-mini"
        },
        "options": {}
      },
      "credentials": {
        "openAiApi": {
          "name": "<your credential>"
        }
      },
      "typeVersion": 1.2
    },
    {
      "id": "5176f475-704b-446e-b368-ffa395bb089e",
      "name": "OpenAI Chat Model1",
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "position": [
        480,
        -460
      ],
      "parameters": {
        "model": {
          "__rl": true,
          "mode": "list",
          "value": "gpt-4o-mini"
        },
        "options": {}
      },
      "credentials": {
        "openAiApi": {
          "name": "<your credential>"
        }
      },
      "typeVersion": 1.2
    },
    {
      "id": "0e8a75dd-ce68-46c3-972c-32b15e04b254",
      "name": "Send reply",
      "type": "n8n-nodes-base.gmail",
      "position": [
        940,
        -660
      ],
      "parameters": {
        "message": "={{ $json.output }}",
        "options": {},
        "messageId": "={{ $('Gmail Trigger').first().json.id }}",
        "operation": "reply"
      },
      "credentials": {
        "gmailOAuth2": {
          "name": "<your credential>"
        }
      },
      "typeVersion": 2.1
    },
    {
      "id": "bf154384-274a-4cdd-977d-890220948a9d",
      "name": "Gmail Trigger",
      "type": "n8n-nodes-base.gmailTrigger",
      "position": [
        -280,
        -640
      ],
      "parameters": {
        "filters": {
          "readStatus": "unread",
          "includeSpamTrash": false
        },
        "pollTimes": {
          "item": [
            {
              "mode": "everyMinute"
            }
          ]
        }
      },
      "credentials": {
        "gmailOAuth2": {
          "name": "<your credential>"
        }
      },
      "typeVersion": 1.2
    },
    {
      "id": "5a268b34-38ea-4e55-87ab-8a616e2aa1fa",
      "name": "Classify appointment",
      "type": "@n8n/n8n-nodes-langchain.textClassifier",
      "position": [
        -60,
        -640
      ],
      "parameters": {
        "options": {
          "fallback": "discard"
        },
        "inputText": "=Please evaluate the following email to determine if it suggests scheduling a meeting or a call:\nSubject: {{ $json.Subject }}\nSnippet: {{ $json.snippet }}",
        "categories": {
          "categories": [
            {
              "category": "is_appointment",
              "description": "email Is requesting an appointment"
            }
          ]
        }
      },
      "typeVersion": 1
    },
    {
      "id": "7b5a8468-09e5-4575-97cb-9175ee02b19d",
      "name": "Agent",
      "type": "@n8n/n8n-nodes-langchain.agent",
      "position": [
        500,
        -660
      ],
      "parameters": {
        "text": "=Sender: {{ $('Gmail Trigger').first().json.From }}\nSubject: {{ $('Gmail Trigger').first().json.Subject }}\nEmail Text: {{ $('Gmail Trigger').first().json.snippet }}",
        "options": {
          "systemMessage": "=You are an email scheduling assistant. Based on the received email, check my availability and propose an appropriate response. \nAim to get a specific time, rather than just a day. When checking my availability, make sure that there's enough time in between meetings.\nIf I'm not available, ALWAYS propose a new time based on my availability. When proposing a new time, always leave 15 minutes buffer from previous meeting.\nToday date and time is: {{ $now.toISO() }}."
        },
        "promptType": "define"
      },
      "typeVersion": 1.8
    },
    {
      "id": "b61e8061-5719-4c30-97da-e306e7b79b76",
      "name": "Google Calendar",
      "type": "n8n-nodes-base.googleCalendarTool",
      "position": [
        680,
        -460
      ],
      "parameters": {
        "options": {},
        "timeMax": "={{ $now.plus(1, 'month').toISO() }}",
        "timeMin": "={{ $now.minus(1, 'day').toISO() }}",
        "calendar": {
          "__rl": true,
          "mode": "id",
          "value": "your_email@gmail.com"
        },
        "operation": "getAll",
        "returnAll": true
      },
      "credentials": {
        "googleCalendarOAuth2Api": {
          "name": "<your credential>"
        }
      },
      "typeVersion": 1.3
    },
    {
      "id": "47e07b6c-d432-4111-b33e-56d6c305c40c",
      "name": "Mark as read",
      "type": "n8n-nodes-base.gmail",
      "position": [
        940,
        -480
      ],
      "parameters": {
        "messageId": "={{ $('Gmail Trigger').first().json.id }}",
        "operation": "markAsRead"
      },
      "credentials": {
        "gmailOAuth2": {
          "name": "<your credential>"
        }
      },
      "typeVersion": 2.1
    }
  ],
  "connections": {
    "Agent": {
      "main": [
        [
          {
            "node": "Send reply",
            "type": "main",
            "index": 0
          },
          {
            "node": "Mark as read",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Gmail Trigger": {
      "main": [
        [
          {
            "node": "Classify appointment",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Google Calendar": {
      "ai_tool": [
        [
          {
            "node": "Agent",
            "type": "ai_tool",
            "index": 0
          }
        ]
      ]
    },
    "OpenAI Chat Model": {
      "ai_languageModel": [
        [
          {
            "node": "Classify appointment",
            "type": "ai_languageModel",
            "index": 0
          }
        ]
      ]
    },
    "OpenAI Chat Model1": {
      "ai_languageModel": [
        [
          {
            "node": "Agent",
            "type": "ai_languageModel",
            "index": 0
          }
        ]
      ]
    },
    "Classify appointment": {
      "main": [
        [
          {
            "node": "Agent",
            "type": "main",
            "index": 0
          }
        ],
        []
      ]
    }
  }
}

Credentials you'll need

Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.

• gmailOAuth2
• googleCalendarOAuth2Api
• openAiApi

About this workflow

Gmail Googlecalendartool. Uses stickyNote, lmChatOpenAi, gmail, gmailTrigger. Event-driven trigger; 10 nodes.

Source: https://github.com/Zie619/n8n-workflows — original creator credit. Request a take-down →

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