{
  "name": "75 IT helpdesk + lean prompt (reference)",
  "nodes": [
    {
      "name": "Question webhook",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 2,
      "parameters": {
        "httpMethod": "POST",
        "path": "my-cost",
        "responseMode": "responseNode",
        "options": {}
      },
      "webhookId": "797db9f9-e9ff-5363-9d0a-58d23a2047f0",
      "position": [
        0,
        300
      ],
      "id": "3ccc3834-a583-51bd-a80f-b20124e32b64"
    },
    {
      "name": "Has question?",
      "type": "n8n-nodes-base.if",
      "typeVersion": 2.2,
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "loose",
            "version": 2
          },
          "conditions": [
            {
              "id": "c1",
              "leftValue": "={{ $json.body.question }}",
              "rightValue": "",
              "operator": {
                "type": "string",
                "operation": "notEmpty",
                "singleValue": true
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      },
      "position": [
        220,
        300
      ],
      "id": "7e27dce9-fa3b-5c88-98b3-1dce956d16d2"
    },
    {
      "name": "Reject empty",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.1,
      "parameters": {
        "respondWith": "json",
        "responseBody": "{ \"error\": \"question is required\" }",
        "options": {
          "responseCode": 400
        }
      },
      "position": [
        440,
        560
      ],
      "id": "f3591be9-5676-5bb7-ab46-6984719af080"
    },
    {
      "name": "Get prices",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "url": "http://data-api:8800/prices",
        "options": {}
      },
      "position": [
        1100,
        300
      ],
      "id": "baa4796d-564b-5cc0-949a-d79738b12ba7"
    },
    {
      "name": "Search FAQ",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "url": "http://data-api:8800/faq",
        "options": {},
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "q",
              "value": "={{ $('Question webhook').first().json.body.question }}"
            }
          ]
        }
      },
      "position": [
        1540,
        300
      ],
      "id": "e2005518-7a82-579a-acda-cc74b33968a9"
    },
    {
      "name": "Get ticket",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "url": "=http://data-api:8800/tickets/{{ (($('Question webhook').first().json.body.question.match(/T-?\\d{4}/i) || ['NONE'])[0]).toUpperCase().replace(/^T(\\d)/, 'T-$1') }}",
        "options": {
          "response": {
            "response": {
              "neverError": true
            }
          }
        },
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "requester",
              "value": "={{ $('Question webhook').first().json.body.user ?? '' }}"
            }
          ]
        }
      },
      "position": [
        1760,
        300
      ],
      "id": "9d6c9b87-54bc-5433-bad3-6e33744e10ca"
    },
    {
      "name": "Classify",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "method": "POST",
        "url": "https://api.openai.com/v1/chat/completions",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "openAiApi",
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={{ JSON.stringify({ model: 'gpt-4.1-mini', temperature: 0, messages: [{ role: 'system', content: \"You sort one company IT help-desk question. Categories: faq (how to fix or use something), ticket (asks about the status of a ticket like T-1002), other. Return only JSON, no code fence: {\\\"category\\\": \\\"faq\\\"}\" }, { role: 'user', content: $('Question webhook').first().json.body.question }] }) }}",
        "options": {
          "timeout": 60000
        }
      },
      "credentials": {
        "openAiApi": {
          "id": "openAiCourse0001",
          "name": "OpenAI (.env)"
        }
      },
      "position": [
        2420,
        300
      ],
      "id": "07e553a6-f8eb-5513-a566-db99f5b11d29"
    },
    {
      "name": "Answer",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "method": "POST",
        "url": "https://api.openai.com/v1/chat/completions",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "openAiApi",
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={{ JSON.stringify({ model: 'gpt-4.1-mini', temperature: 0, max_completion_tokens: 200, messages: [{ role: 'system', content: \"You are the company IT help desk. Answer in Korean in at most 3 sentences, using only the FAQ entries and the ticket record given. Never invent steps, dates or names. For a ticket, say its status and note. If the data does not answer the question, say \\\"찾지 못했습니다\\\" and that a staff member will help. Use 합니다체.\" }, { role: 'user', content: '질문: ' + $('Question webhook').first().json.body.question + '\\nFAQ: ' + JSON.stringify(($('Search FAQ').first().json.results ?? []).map((f) => ({ id: f.id, title: f.title, answer: f.answer }))) + '\\n접수 건: ' + JSON.stringify((({ ticket_id, title, status, note, error }) => ({ ticket_id, title, status, note, error }))($('Get ticket').first().json)) }] }) }}",
        "options": {
          "timeout": 60000
        }
      },
      "position": [
        2640,
        300
      ],
      "credentials": {
        "openAiApi": {
          "id": "openAiCourse0001",
          "name": "OpenAI (.env)"
        }
      },
      "id": "fd329729-e718-56ff-805c-aa298d26c0b2"
    },
    {
      "name": "Review",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "method": "POST",
        "url": "https://api.openai.com/v1/chat/completions",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "openAiApi",
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={{ JSON.stringify({ model: 'gpt-4.1-mini', temperature: 0, messages: [{ role: 'system', content: \"You review a Korean IT help-desk answer before it is sent. Keep the facts exactly. Make it polite (합니다체), remove anything not supported by the data, keep at most 3 sentences. Return only the final answer text.\" }, { role: 'user', content: '초안: ' + $('Answer').first().json.choices[0].message.content }] }) }}",
        "options": {
          "timeout": 60000
        }
      },
      "credentials": {
        "openAiApi": {
          "id": "openAiCourse0001",
          "name": "OpenAI (.env)"
        }
      },
      "position": [
        2860,
        300
      ],
      "id": "f289c264-5e1f-523d-8e18-67ba4cbb166c"
    },
    {
      "name": "Build result",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "parameters": {
        "jsCode": "const ran = (n) => { try { return $(n).isExecuted; } catch (e) { return false; } };\nconst steps = [{\"step\": \"classify\", \"node\": \"Classify\", \"model\": \"gpt-4.1-mini\"}, {\"step\": \"answer\", \"node\": \"Answer\", \"model\": \"gpt-4.1-mini\"}, {\"step\": \"review\", \"node\": \"Review\", \"model\": \"gpt-4.1-mini\"}];\nconst prices = $('Get prices').first().json.models;\nconst by_step = {};\nlet prompt_tokens = 0, completion_tokens = 0, llm_calls = 0, cost_usd = 0;\nfor (const s of steps) {\n  if (!ran(s.node)) continue;\n  const u = $(s.node).first().json.usage ?? {};\n  const row = { model: s.model, prompt_tokens: u.prompt_tokens ?? 0, completion_tokens: u.completion_tokens ?? 0 };\n  const p = prices[s.model] ?? { input: 0, output: 0 };\n  row.cost_usd = Math.round((row.prompt_tokens * p.input + row.completion_tokens * p.output) / 1e6 * 1e8) / 1e8;\n  by_step[s.step] = row;\n  prompt_tokens += row.prompt_tokens; completion_tokens += row.completion_tokens; cost_usd += row.cost_usd; llm_calls += 1;\n}\nconst results = $('Search FAQ').first().json.results ?? [];\nconst answer = String($('Review').first().json.choices[0].message.content ?? '').trim();\nconst result = { route: '자동 답변', answer, sources: results.map((r) => r.id), llm_calls,\n  usage: { prompt_tokens, completion_tokens, by_step }, cost_usd: Math.round(cost_usd * 1e8) / 1e8 };\nreturn [{ json: result }];"
      },
      "position": [
        3520,
        300
      ],
      "id": "d85f4d2b-0957-5a81-a54b-35ba55509871"
    },
    {
      "name": "Record usage",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "method": "POST",
        "url": "http://data-api:8800/usage",
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={{ JSON.stringify({ items: Object.entries($json.usage.by_step).map(([step, row]) => ({ request_id: $execution.id, user: $('Question webhook').first().json.body.user ?? '', step, model: row.model, prompt_tokens: row.prompt_tokens, completion_tokens: row.completion_tokens, cost_usd: row.cost_usd, route: $json.route })) }) }}",
        "options": {
          "response": {
            "response": {
              "neverError": true
            }
          },
          "timeout": 3000
        }
      },
      "position": [
        3740,
        300
      ],
      "onError": "continueRegularOutput",
      "id": "a46b3503-5039-5cb6-890e-69149fe23f55"
    },
    {
      "name": "Result again",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "parameters": {
        "jsCode": "return [{ json: { ...$('Build result').first().json, recorded: Number($json.stored ?? 0) > 0 } }];"
      },
      "position": [
        3960,
        300
      ],
      "id": "1b8127ae-a43b-5096-8f94-c96892a085db"
    },
    {
      "name": "Send result",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.1,
      "parameters": {
        "respondWith": "json",
        "responseBody": "={{ $json }}",
        "options": {}
      },
      "position": [
        4180,
        300
      ],
      "id": "6cbcbfe3-9306-5287-b0c6-79f3fe0f9a5e"
    }
  ],
  "connections": {
    "Question webhook": {
      "main": [
        [
          {
            "node": "Has question?",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Has question?": {
      "main": [
        [
          {
            "node": "Get prices",
            "type": "main",
            "index": 0
          }
        ],
        [
          {
            "node": "Reject empty",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Get prices": {
      "main": [
        [
          {
            "node": "Search FAQ",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Search FAQ": {
      "main": [
        [
          {
            "node": "Get ticket",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Get ticket": {
      "main": [
        [
          {
            "node": "Classify",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Classify": {
      "main": [
        [
          {
            "node": "Answer",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Answer": {
      "main": [
        [
          {
            "node": "Review",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Review": {
      "main": [
        [
          {
            "node": "Build result",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Build result": {
      "main": [
        [
          {
            "node": "Record usage",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Record usage": {
      "main": [
        [
          {
            "node": "Result again",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Result again": {
      "main": [
        [
          {
            "node": "Send result",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "settings": {
    "executionOrder": "v1"
  }
}