Build a GPT-4o AI Personal Assistant in n8n: Email, Calendar, Search & CRM Automation

Telegram message → OpenRouter GPT-4o routing → multi-tool agent execution → Telegram reply

Who

Individuals or small teams with an n8n instance who need integrated email, calendar, search, and contact automation

You get

Manage emails, schedule, search, and contacts via Telegram chat with an AI agent that retains context through a memory node

You need

n8n · telegram · gmail

Steps

1. Prepare environment and credentials

   Create the following credentials in n8n Settings > Credentials: openRouterApi (for GPT-4o), telegramApi (for trigger and response), serpApi (Google Search), perplexityApi (optional search enhancement). Google API credentials are also needed for Gmail, Calendar, and Contacts tools if used.

2. Configure Telegram trigger

   Add a Telegram Trigger node, set updates to message, and connect the telegramApi credential. This node receives user Telegram messages as the workflow entry point. Note: source indicates this can be replaced with other triggers.

3. Configure the AI Agent supervisor node

   Add an AI Agent node (type: @n8n/n8n-nodes-langchain.agent), connect the Telegram Trigger1 output. Set promptType to define, and set the text field to the Telegram message expression. Wire the OpenRouter Chat Model as the language model and Simple Memory as the memory node.

   Execution prompt · Source text。AI Agent node text input field (promptType=define)

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   ={{ $('Telegram Trigger1').item.json.message.text }}

   Execution prompt · Source text。AI Agent node systemMessage field (options.systemMessage)

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   =# ROLE
   
   You are an AI agent called Ava.
   
   Your job is to orchestrate the activities between different agents and then formulate a friendly response back to the user.
   
   You should never write emails, create contacts, create content, create calendar events, create summaries yourself. Your job is to call agents and tools in the correct sequence.
   
   Think carefully about the sequence of events. Some tools might first require you to call another tool in order to pass it the correct information.
   
   
   The tools are:
   - Calendar
   - Contacts
   - Gmail
   - Google Search 
   - Calculator
   
   
   # ADDITIONAL INFORMATION
   - You are talking to Jordan
   - The current date and time is {{  $now.toString() }}
   - Time zone is EST (Ottawa)
   
   
   
   # RULES

4. Wire tool nodes

   Connect the following tool nodes to AI Agent via ai_tool: Calculator (math operations), Google Search (SerpApi, credential required), Calendar (toolWorkflow, references external Calendar Agent workflow), Gmail (toolWorkflow, references external Gmail Agent workflow), Contacts (toolWorkflow, references external Contacts Agent workflow), LinkedIn Comment Agent (toolWorkflow, optional), Perplexity (perplexityTool, credential required, model sonar). Each toolWorkflow node needs the corresponding external workflowId and description.

5. Configure Telegram response and memory

   Add a Telegram node as Response, connect to AI Agent main output. Set text to {{ $json.output }}, chatId to {{ $('Telegram Trigger1').item.json.message.chat.id }}, and disable appendAttribution. Add a Simple Memory node, set sessionKey to {{ $('Telegram Trigger1').item.json.message.chat.id }}, contextWindowLength to 7, and connect as ai_memory to AI Agent.

6. Test and extend

   Send a message to your Telegram Bot to test tool routing. To extend: add more toolWorkflow agents, replace Telegram with another channel, or adjust timezone and user info in the AI Agent systemMessage.

You are assisting with reproducing n8n template 5552: a GPT-4o-based multi-tool AI personal assistant. First confirm you have an n8n instance, OpenRouter/telegram/serpApi/perplexity credentials, and optional Google API credentials. Then import workflow.json or build nodes manually, verifying the AI Agent systemMessage is complete and each toolWorkflow's external workflowId is replaced with your own sub-workflows.