Conversion Agent

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": "Conversion Agent",
  "nodes": [
    {
      "parameters": {
        "inputSource": "passthrough"
      },
      "type": "n8n-nodes-base.executeWorkflowTrigger",
      "typeVersion": 1.1,
      "position": [
        0,
        0
      ],
      "id": "943ecffe-c1c5-47c7-9d7a-e61f13eceb8b",
      "name": "When Executed by Another Workflow"
    },
    {
      "parameters": {
        "promptType": "define",
        "text": "={{ $json.query }}",
        "options": {
          "systemMessage": "## 1 \u00b7 ROLE  \nYou are **Data\u202fConverter**, a precise, unit\u2011conversion micro\u2011service that assists *Health\u202fAssistant* by converting numerical values between medical units.\n\n*You never provide clinical interpretations, only conversions.*\n\nThe calling agent sends you a request such as:\n\"Convert 123 lbs to kgs\"\n\nYou **must reply** with the correct value that is immediately usable by Health\u202fAssistant:\n\n\"55.79 kg\"\n\nIf the conversion is unsupported reply with:\n\"unsupported conversion\"\n\nNo additional keys or text.\n\n---\n\n## 2 \u00b7 TOOLS  \n\n| Tool            | Purpose                                                         | Usage |\n|-----------------|-----------------------------------------------------------------|-------|\n| **calculator**  | Performs arithmetic (add, subtract, multiply, divide, exponent) | Use for every conversion to avoid manual math and ensure precision. |\n\n---\n\n## 3 \u00b7 SUPPORTED CONVERSIONS  \n\n| Category | from_unit / to_unit pairs | Formula |\n|----------|---------------------------|---------|\n| **Weight** | `lb` \u2194 `kg` | `lb * 0.453592`, `kg / 0.453592` |\n| **Height / Length** | `in` \u2194 `cm`, `ft` \u2194 `cm`, `cm` \u2194 `m` | `in * 2.54`, `ft * 30.48`, `cm / 100` |\n| **Temperature** | `F` \u2194 `C` | `(F \u2212 32) * 5/9`, `(C * 9/5) + 32` |\n| **Glucose** | `mg/dL` \u2194 `mmol/L` | `mg/dL / 18`, `mmol/L * 18` |\n| **Cholesterol (TC/LDL/HDL)** | `mg/dL` \u2194 `mmol/L` | `mg/dL / 38.67`, `mmol/L * 38.67` |\n| **Triglycerides** | `mg/dL` \u2194 `mmol/L` | `mg/dL / 88.57`, `mmol/L * 88.57` |\n| **Creatinine** | `mg/dL` \u2194 `\u03bcmol/L` | `mg/dL * 88.4`, `\u03bcmol/L / 88.4` |\n| **Body Surface Area** | `m2` \u2194 `ft2` | `m\u00b2 * 10.7639`, `ft\u00b2 / 10.7639` |\n\n*Units are case\u2011insensitive; accept synonyms (`kilogram`, `lbs`) but always **return** the canonical unit abbreviation shown above.*\n\n---\n\n## 4 \u00b7 RULES  \n\n1. **No free\u2011text explanations.** \n2. Round to **3 significant digits** unless the input has higher precision.  \n3. Use the **calculator** tool for every numeric operation.  \n4. If either unit is missing or not in the table above, respond with the unsupported response.  \n\n---"
        }
      },
      "type": "@n8n/n8n-nodes-langchain.agent",
      "typeVersion": 1.8,
      "position": [
        220,
        0
      ],
      "id": "5cbfb649-e3ef-4a85-b18f-47b83870a427",
      "name": "AI Agent"
    },
    {
      "parameters": {},
      "type": "@n8n/n8n-nodes-langchain.toolCalculator",
      "typeVersion": 1,
      "position": [
        460,
        280
      ],
      "id": "f7fdc62a-7fe4-4eb7-a172-4df74893d4ed",
      "name": "calculator"
    },
    {
      "parameters": {
        "model": {
          "__rl": true,
          "value": "qwen2.5-32-ctx:latest",
          "mode": "list",
          "cachedResultName": "qwen2.5-32-ctx:latest"
        },
        "options": {}
      },
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "typeVersion": 1.2,
      "position": [
        220,
        240
      ],
      "id": "9b717866-1e74-4fa8-996c-e73da677677e",
      "name": "Ollama",
      "credentials": {
        "openAiApi": {
          "name": "<your credential>"
        }
      }
    }
  ],
  "connections": {
    "When Executed by Another Workflow": {
      "main": [
        [
          {
            "node": "AI Agent",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "calculator": {
      "ai_tool": [
        [
          {
            "node": "AI Agent",
            "type": "ai_tool",
            "index": 0
          }
        ]
      ]
    },
    "Ollama": {
      "ai_languageModel": [
        [
          {
            "node": "AI Agent",
            "type": "ai_languageModel",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": false,
  "settings": {
    "executionOrder": "v1"
  },
  "versionId": "05b5a0c2-4175-4d88-8354-417c5dac4981",
  "meta": {
    "templateCredsSetupCompleted": true
  },
  "id": "gVJjwuKcZ09hlFj4",
  "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.

• openAiApi

About this workflow

Conversion Agent. Uses executeWorkflowTrigger, agent, toolCalculator, lmChatOpenAi. Event-driven trigger; 4 nodes.

Source: https://github.com/DaveBben/apple-health-ai-agent/blob/036f691adbb1eb28201db877de2b90a8028660b0/n8n/Conversion_Agent.json — original creator credit. Request a take-down →

More AI & RAG workflows → · Browse all categories →

Related workflows

Workflows that share integrations, category, or trigger type with this one. All free to copy and import.