{
  "name": "Guard Sub-workflow: Costly API",
  "nodes": [
    {
      "parameters": {},
      "id": "exec-trigger",
      "name": "Execute Workflow Trigger",
      "type": "n8n-nodes-base.executeWorkflowTrigger",
      "typeVersion": 1,
      "position": [200, 200]
    },
    {
      "parameters": {
        "jsCode": "// Mock shared state DB check (e.g. Postgres / Redis)\nconst inputData = $input.item.json;\n\nconst currentSpend = 1.50;\nconst budgetLimit = 2.00;\nconst estimatedToolCost = 0.75;\n\nreturn {\n  approved: (currentSpend + estimatedToolCost) <= budgetLimit,\n  query: inputData.query || \"default-search\",\n  message: \"Budget evaluation complete.\"\n};"
      },
      "id": "code-check",
      "name": "Evaluate Budget Limits",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [420, 200]
    },
    {
      "parameters": {
        "conditions": {
          "boolean": [
            {
              "value1": "={{ $json.approved }}",
              "value2": true
            }
          ]
        }
      },
      "id": "if-node",
      "name": "Budget OK?",
      "type": "n8n-nodes-base.if",
      "typeVersion": 1,
      "position": [640, 200]
    },
    {
      "parameters": {
        "url": "https://dummyjson.com/http/200/Costly_API_Mock_Success",
        "options": {}
      },
      "id": "api-call",
      "name": "Costly API Exec (Mock)",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4,
      "position": [860, 100]
    },
    {
      "parameters": {
        "values": {
          "string": [
            {
              "name": "result",
              "value": "Tool execution denied: Global budget limit reached. Please inform the user."
            }
          ]
        },
        "options": {}
      },
      "id": "set-error",
      "name": "Deny Message",
      "type": "n8n-nodes-base.set",
      "typeVersion": 2,
      "position": [860, 320]
    }
  ],
  "connections": {
    "Execute Workflow Trigger": {
      "main": [
        [
          {
            "node": "Evaluate Budget Limits",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Evaluate Budget Limits": {
      "main": [
        [
          {
            "node": "Budget OK?",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Budget OK?": {
      "main": [
        [
          {
            "node": "Costly API Exec (Mock)",
            "type": "main",
            "index": 0
          }
        ],
        [
          {
            "node": "Deny Message",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  }
}