{
  "name": "Bilig WorkPaper MCP formula engine for n8n agents",
  "nodes": [
    {
      "parameters": {
        "content": "## Bilig WorkPaper MCP\n\nCalls the public Bilig WorkPaper MCP endpoint, writes a formula into a demo workbook, and verifies calculated readback + restore proof.\n\nNo Excel, browser automation, credentials, or local files required.\n\nRepo: https://github.com/proompteng/bilig",
        "height": 220,
        "width": 360,
        "color": 5
      },
      "id": "bilig-note-0001",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "typeVersion": 1,
      "position": [
        -760,
        -180
      ]
    },
    {
      "parameters": {},
      "id": "bilig-manual-trigger-0001",
      "name": "Manual Trigger",
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        -700,
        120
      ]
    },
    {
      "parameters": {
        "method": "POST",
        "url": "https://bilig.proompteng.ai/mcp",
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "content-type",
              "value": "application/json"
            },
            {
              "name": "accept",
              "value": "application/json, text/event-stream"
            },
            {
              "name": "mcp-protocol-version",
              "value": "2025-11-25"
            }
          ]
        },
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"tools/call\",\"params\":{\"name\":\"set_cell_contents\",\"arguments\":{\"sheetName\":\"Inputs\",\"address\":\"C2\",\"value\":\"=B2*B3\"}}}",
        "options": {
          "timeout": 30000
        }
      },
      "id": "bilig-http-request-0001",
      "name": "Bilig MCP: write formula and verify",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        -420,
        120
      ]
    },
    {
      "parameters": {
        "jsCode": "const response = $input.first().json;\nconst text = response?.result?.content?.[0]?.text;\nif (!text) {\n  throw new Error('Bilig MCP did not return MCP text content.');\n}\nconst proof = JSON.parse(text);\nconst displayValue = proof?.after?.displayValue;\nconst formula = proof?.after?.formula;\nconst restoredMatchesAfter = proof?.checks?.restoredMatchesAfter === true;\nif (formula !== '=B2*B3') {\n  throw new Error('Unexpected formula readback: ' + String(formula));\n}\nif (displayValue !== '5') {\n  throw new Error('Unexpected calculated value: ' + String(displayValue));\n}\nif (!restoredMatchesAfter) {\n  throw new Error('Bilig MCP did not prove restored readback.');\n}\nreturn [{\n  json: {\n    summary: 'Bilig WorkPaper calculated =B2*B3 as 5 and proved restored readback.',\n    editedCell: proof.editedCell,\n    formula,\n    displayValue,\n    restoredMatchesAfter,\n    github: 'https://github.com/proompteng/bilig',\n    docs: 'https://proompteng.github.io/bilig/mcp-workpaper-tool-server.html',\n    mcpRegistry: 'https://registry.modelcontextprotocol.io/v0.1/servers?search=io.github.proompteng%2Fbilig-workpaper',\n    proof\n  }\n}];"
      },
      "id": "bilig-extract-proof-0001",
      "name": "Extract formula proof",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        -120,
        120
      ]
    }
  ],
  "connections": {
    "Manual Trigger": {
      "main": [
        [
          {
            "node": "Bilig MCP: write formula and verify",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Bilig MCP: write formula and verify": {
      "main": [
        [
          {
            "node": "Extract formula proof",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "pinData": {},
  "meta": {
    "templateCredsSetupCompleted": true
  },
  "settings": {
    "executionOrder": "v1"
  }
}