n8n Telegram to Calendar Assistant

A lightweight n8n workflow that processes Telegram messages (text or voice), transcribes audio, uses AI to decide calendar actions, and interacts with Google Calendar (Create/Get/Update/Delete). Replies back via Telegram and can send optional Gmail notifications.

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What it does

• Handles Text or Voice inputs from Telegram.
• Transcribes voice messages.
• Uses AI to interpret intent and perform Google Calendar actions (create, get, update, delete).
• Replies to the user via Telegram; optional Gmail output.

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Core Nodes

• Telegram Trigger
• Get a file
• Transcribe a recording
• AI Agent (OpenAI LangChain)
• Google Calendar Tool (Create/Get/Update/Delete)
• Simple Memory
• Edit Fields / Switch (Text or Audio)
• Send Telegram message
• Optional: Gmail

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How data flows

Telegram Trigger → determine Text or Voice → (Voice → Transcription) → AI agent decides calendar action → Google Calendar tools execute → Telegram reply (or Gmail if needed).

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Example use cases

• User sends a voice message: “Schedule a meeting tomorrow” → transcript → create event → confirmation sent back.
• User sends text: “Update next week 10–11” → AI decides update → calendar updated → confirmation sent.
• User sends a non-calendar request: AI routes to a generic reply via Telegram.

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Quick Start

• Import the workflow JSON into your n8n instance.
• Configure credentials: Telegram, Google Calendar, and OpenAI/LangChain as needed.
• Run and test with a Telegram message or voice note.

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Requirements

• n8n with support for LangChain/OpenAI nodes
• Telegram Bot credentials
• Google Calendar OAuth credentials
• Optional Gmail credentials