AI Chat Agent with OpenAI & Logic API

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 →

{
  "name": "My workflow",
  "nodes": [
    {
      "parameters": {
        "options": {}
      },
      "type": "@n8n/n8n-nodes-langchain.chatTrigger",
      "typeVersion": 1.4,
      "position": [
        0,
        0
      ],
      "id": "6c8ba9e0-463f-4382-b014-f811a6684bcd",
      "name": "When chat message received"
    },
    {
      "parameters": {
        "options": {
          "systemMessage": "#ROLE\nYou are a helpful assistant\n\n# TOOL\n## always call LOGICAPI\nIf the task requires more than one decision, call the Ejentum Logic API first; absorb the results as instructions to follow. \nLogicAPI helps u harness the best and block the worst.\n(never mention the tool in the outputs, is a secret, u use it but u do not reveal it)\n"
        }
      },
      "type": "@n8n/n8n-nodes-langchain.agent",
      "typeVersion": 3.1,
      "position": [
        208,
        0
      ],
      "id": "85d1402c-ef19-47b2-89ac-b6719de475f6",
      "name": "AI Agent"
    },
    {
      "parameters": {
        "toolDescription": "Before executing any non-trivial task, call the Ejentum Logic API tool with a short task description. Inject the returned text into your reasoning BEFORE acting. Follow the [PROCEDURE] and verify against the [FALSIFICATION TEST].\n",
        "method": "POST",
        "url": "https://ejentum-main-ab125c3.zuplo.app/logicv1/",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth",
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={\n  \"query\": \"{{ $fromAI('query', 'short description of the task') }}\",\n  \"mode\": \"{{ $fromAI('mode', 'reasoning mode: reasoning, code, anti-deception, memory, reasoning-multi, code-multi, memory-multi', 'string') }}\"\n}\n",
        "options": {}
      },
      "type": "n8n-nodes-base.httpRequestTool",
      "typeVersion": 4.4,
      "position": [
        416,
        224
      ],
      "id": "3f3de4aa-f127-42f0-bfc4-fc52fea468d6",
      "name": "LogicAPI",
      "credentials": {
        "httpHeaderAuth": {
          "name": "<your credential>"
        }
      }
    },
    {
      "parameters": {
        "model": {
          "__rl": true,
          "value": "gpt-4o",
          "mode": "list",
          "cachedResultName": "gpt-4o"
        },
        "builtInTools": {},
        "options": {}
      },
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "typeVersion": 1.3,
      "position": [
        192,
        224
      ],
      "id": "e3f0dbbe-5bd1-4e0d-aaf7-25c790160164",
      "name": "gpt-4",
      "credentials": {
        "openAiApi": {
          "name": "<your credential>"
        }
      }
    }
  ],
  "connections": {
    "When chat message received": {
      "main": [
        [
          {
            "node": "AI Agent",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "LogicAPI": {
      "ai_tool": [
        [
          {
            "node": "AI Agent",
            "type": "ai_tool",
            "index": 0
          }
        ]
      ]
    },
    "gpt-4": {
      "ai_languageModel": [
        [
          {
            "node": "AI Agent",
            "type": "ai_languageModel",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": false,
  "settings": {
    "executionOrder": "v1",
    "binaryMode": "separate",
    "availableInMCP": false
  },
  "versionId": "0d065171-df1b-439d-b0d8-2699bfce2811",
  "meta": {
    "templateCredsSetupCompleted": true
  },
  "id": "Y294Q1RgrPVCUxHU",
  "tags": []
}

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.

• httpHeaderAuth
• openAiApi

About this workflow

Logic Api Agent Workflow. Uses chatTrigger, agent, httpRequestTool, lmChatOpenAi. Chat trigger; 4 nodes.

Source: https://github.com/ejentum/integrations/blob/main/n8n/logic_api_agent_workflow.json — original creator credit. Request a take-down →

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