Build Custom AI Agent with LangChain & Gemini (Self-Hosted)

Manual

Medium

Nodes

Manual

Trigger

Medium

Complexity

7/22/2025

Added

Workflow Overview

Total Nodes

Node Types

chat Trigger

When chat message received

1 node

lm Chat Google Gemini

Google Gemini Chat Model

1 node

sticky Note

Sticky Note, Sticky Note1, Sticky Note2, Sticky Note3, Sticky Note4

5 nodes

memory Buffer Window

Store conversation history

1 node

code

Construct & Execute LLM Prompt

1 node

Workflow JSON

8.26 KB

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  "nodes": [
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      "id": "8bd5382d-f302-4e58-b377-7fc5a22ef994",
      "name": "When chat message received",
      "type": "@n8n/n8n-nodes-langchain.chatTrigger",
      "position": [
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      "webhookId": "b8a5d72c-4172-40e8-b429-d19c2cd6ce54",
      "parameters": {
        "public": true,
        "options": {
          "responseMode": "lastNode",
          "allowedOrigins": "*",
          "loadPreviousSession": "memory"
        },
        "initialMessages": ""
      },
      "typeVersion": 1.1
    },
    {
      "id": "6ae8a247-4077-4...

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