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aio-01d4-stu/Last3Mon/72/reference/lab03-example2-llm-fallback.json
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{
"name": "72 IT helpdesk + LLM fallback (reference)",
"nodes": [
{
"name": "Question webhook",
"type": "n8n-nodes-base.webhook",
"typeVersion": 2,
"parameters": {
"httpMethod": "POST",
"path": "my-helpdesk",
"responseMode": "responseNode",
"options": {}
},
"webhookId": "de518e93-ed19-541f-a6fc-687a4efaf1b2",
"position": [
0,
300
],
"id": "da213575-a9a7-5052-9259-1235f4e340f0"
},
{
"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": "4ea38fda-f28a-5e1d-a504-05874f837f02"
},
{
"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": "ff743009-a8ea-5c5f-8b83-9e29a2c60111"
},
{
"name": "Start clock",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "return [{ json: { t: Date.now() } }];"
},
"position": [
440,
300
],
"id": "f1cc57e6-9966-5f49-90c4-cbd65be68041"
},
{
"name": "Cache key",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "const body = $('Question webhook').first().json.body;\nconst key = String(body.question ?? '').trim().toLowerCase().replace(/\\s+/g, ' ');\nreturn [{ json: { ...$json, key, use_cache: body.no_cache !== true } }];"
},
"position": [
660,
300
],
"id": "3c70cd68-4a52-59c2-a5c3-d30c86914021"
},
{
"name": "Cache lookup",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"parameters": {
"url": "=http://data-api:8800/cache/{{ encodeURIComponent($json.key) }}",
"options": {
"response": {
"response": {
"neverError": true
}
}
}
},
"position": [
880,
300
],
"id": "506d8e43-b396-596a-8197-08f2aa58381b"
},
{
"name": "Cached?",
"type": "n8n-nodes-base.if",
"typeVersion": 2.2,
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "loose",
"version": 2
},
"conditions": [
{
"id": "c1",
"leftValue": "={{ $json.value !== undefined && $('Cache key').first().json.use_cache }}",
"rightValue": "",
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
}
}
],
"combinator": "and"
},
"options": {}
},
"position": [
1100,
300
],
"id": "1113fdf6-f964-5534-8d8a-dd41344c2725"
},
{
"name": "Cached result",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "const value = $json.value;\nconst t0 = $('Start clock').first().json.t;\nreturn [{ json: { route: value.route, category: value.category, answer: value.answer, sources: value.sources ?? [],\n llm_calls: 0, cached: true, steps: ['cache'], timings: { total_ms: t0 ? Date.now() - t0 : 0 } } }];"
},
"position": [
1320,
40
],
"id": "82a7f0f0-356b-5164-baaa-a478f74db65e"
},
{
"name": "Send cached",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"parameters": {
"respondWith": "json",
"responseBody": "={{ $json }}",
"options": {}
},
"position": [
1540,
40
],
"id": "addd6ac5-76a5-5da7-ac2b-84c005eb7520"
},
{
"name": "Search FAQ",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"parameters": {
"url": "http://data-api:8800/faq",
"options": {
"timeout": 2000
},
"sendQuery": true,
"queryParameters": {
"parameters": [
{
"name": "q",
"value": "={{ $('Question webhook').first().json.body.question }}"
}
]
}
},
"retryOnFail": true,
"maxTries": 2,
"waitBetweenTries": 500,
"onError": "continueErrorOutput",
"position": [
1320,
300
],
"id": "52b6a8a9-bf1f-5b58-8644-0077cfd01dd0"
},
{
"name": "Get ticket",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"parameters": {
"url": "=http://data-api:8800/tickets/{{ (($('Question webhook').first().json.body.question.match(/T-?\\d{4}/i) || ['NONE'])[0]).toUpperCase().replace(/^T(\\d)/, 'T-$1') }}",
"options": {
"response": {
"response": {
"neverError": true
}
},
"timeout": 2000
},
"sendQuery": true,
"queryParameters": {
"parameters": [
{
"name": "requester",
"value": "={{ $('Question webhook').first().json.body.user ?? '' }}"
}
]
}
},
"retryOnFail": true,
"maxTries": 2,
"waitBetweenTries": 500,
"onError": "continueErrorOutput",
"position": [
1540,
300
],
"id": "0a16cd98-b769-5067-b867-beabec01b00d"
},
{
"name": "After data",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "return [{ json: { ...$json, t: Date.now() } }];"
},
"position": [
1760,
300
],
"id": "ba6f2475-7cea-5c3d-95a6-dc6125a0441c"
},
{
"name": "Rule classify",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "const question = String($('Question webhook').first().json.body.question ?? '');\nconst results = $('Search FAQ').first().json.results ?? [];\nlet category = 'unknown';\nif (/T-?\\d{4}/i.test(question)) category = 'ticket';\nelse if (results.length > 0) category = 'faq';\nreturn [{ json: { category, by: 'rule' } }];"
},
"position": [
1980,
300
],
"id": "a2e2c597-6870-5bcc-833c-a44526b343f3"
},
{
"name": "Known?",
"type": "n8n-nodes-base.if",
"typeVersion": 2.2,
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "loose",
"version": 2
},
"conditions": [
{
"id": "c1",
"leftValue": "={{ $json.category }}",
"rightValue": "unknown",
"operator": {
"type": "string",
"operation": "notEquals"
}
}
],
"combinator": "and"
},
"options": {}
},
"position": [
2200,
300
],
"id": "e0758a6f-de55-5309-a696-3ed0755ab1f0"
},
{
"name": "Classify",
"type": "@n8n/n8n-nodes-langchain.agent",
"typeVersion": 3.1,
"parameters": {
"promptType": "define",
"text": "={{ $('Question webhook').first().json.body.question }}",
"options": {
"systemMessage": "You sort one company IT help-desk question. Categories: faq (how to fix or use something: password, account lock, VPN, printer, mail box, software install), ticket (asks about the status of an IT request ticket like T-1002), other (anything else). Return only JSON, no code fence: {\"category\": \"faq\"}",
"maxIterations": 1
}
},
"onError": "continueErrorOutput",
"position": [
2420,
300
],
"id": "05ed7c16-110e-53ab-9b03-ce872d616695"
},
{
"name": "Classify model",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
"typeVersion": 1.2,
"parameters": {
"model": {
"__rl": true,
"mode": "id",
"value": "gpt-4.1-mini"
},
"options": {
"temperature": 0
}
},
"credentials": {
"openAiApi": {
"id": "openAiCourse0001",
"name": "OpenAI (.env)"
}
},
"position": [
2420,
520
],
"id": "5a7c30c2-472e-54b3-89c2-85b53e3f432b"
},
{
"name": "Parse category",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "const raw = String($json.output ?? '').trim().replace(/^```(json)?\\s*|```$/g, '');\nlet category = 'other';\ntry { category = JSON.parse(raw).category ?? 'other'; } catch (error) { category = 'other'; }\nif (!['faq', 'ticket', 'other'].includes(category)) category = 'other';\nreturn [{ json: { category, by: 'llm' } }];"
},
"position": [
2640,
300
],
"id": "1407c587-1e10-5d76-b43a-9bf6570eb619"
},
{
"name": "After classify",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "return [{ json: { ...$json, t: Date.now() } }];"
},
"position": [
2860,
300
],
"id": "77f26c5e-fd71-59c5-b02f-cee875e87ee7"
},
{
"name": "Data down",
"type": "n8n-nodes-base.set",
"typeVersion": 3.4,
"parameters": {
"assignments": {
"assignments": [
{
"id": "d1",
"name": "route",
"value": "담당자 연결",
"type": "string"
},
{
"id": "d2",
"name": "answer",
"value": "사내 데이터 시스템이 응답하지 않아 담당자에게 연결합니다.",
"type": "string"
},
{
"id": "d3",
"name": "reason",
"value": "data_api_down",
"type": "string"
}
]
},
"options": {}
},
"position": [
3080,
820
],
"id": "7db7288e-627d-5b0f-8634-2bd12ba22e35"
},
{
"name": "Send data down",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"parameters": {
"respondWith": "json",
"responseBody": "={{ $json }}",
"options": {}
},
"position": [
3300,
820
],
"id": "e582596a-b12d-550c-8ba8-ea5661be5b32"
},
{
"name": "Answer",
"type": "@n8n/n8n-nodes-langchain.agent",
"typeVersion": 3.1,
"parameters": {
"promptType": "define",
"text": "=질문: {{ $('Question webhook').first().json.body.question }}\n분류: {{ $json.category }}\nFAQ: {{ JSON.stringify($('Search FAQ').first().json.results ?? []) }}\n접수 건: {{ JSON.stringify($('Get ticket').first().json) }}",
"options": {
"systemMessage": "You are the company IT help desk. Answer in Korean in at most 3 sentences, using only the FAQ entries and the ticket record given. Never invent steps, dates or names. For a ticket, say its status and note. If the data does not answer the question, say \"찾지 못했습니다\" and that a staff member will help.",
"maxIterations": 1
}
},
"onError": "continueErrorOutput",
"position": [
3080,
300
],
"id": "a0b37e8a-ba45-5496-baf5-3fe7eb4e11cb"
},
{
"name": "Answer model",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
"typeVersion": 1.2,
"parameters": {
"model": {
"__rl": true,
"mode": "id",
"value": "gpt-4.1-mini"
},
"options": {
"temperature": 0
}
},
"credentials": {
"openAiApi": {
"id": "openAiCourse0001",
"name": "OpenAI (.env)"
}
},
"position": [
3080,
520
],
"id": "eadbe0ed-8031-5d85-91c2-258b144dcc6d"
},
{
"name": "After answer",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "return [{ json: { ...$json, t: Date.now() } }];"
},
"position": [
3300,
300
],
"id": "2a0a5546-0677-5a3b-89b9-cfb1887a696b"
},
{
"name": "Review check",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "let answer = String($('Answer').first().json.output ?? '').trim();\nconst problems = [];\nif (!answer) problems.push('empty');\nif (!/[가-힣]/.test(answer)) problems.push('not_korean');\nif (answer.length > 400) { answer = answer.slice(0, 400); problems.push('too_long'); }\nreturn [{ json: { ...$json, answer, review_problems: problems } }];"
},
"position": [
3520,
300
],
"id": "24064ede-b012-51e6-8e8a-a40032982e5b"
},
{
"name": "After review",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "return [{ json: { ...$json, t: Date.now() } }];"
},
"position": [
3740,
300
],
"id": "d6ea34a2-56fe-5d19-b1fe-a07a2176b6cf"
},
{
"name": "Build result",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "const ran = (name) => { try { return $(name).isExecuted; } catch (error) { return false; } };\nconst body = $('Question webhook').first().json.body;\nconst category = $('Parse category').isExecuted ? $('Parse category').first().json.category : $('Rule classify').first().json.category;\nconst answer = $('Review check').first().json.answer;\nconst results = $('Search FAQ').first().json.results ?? [];\nconst sources = category === 'faq' ? results.map((r) => r.id) : [];\nconst steps = [];\nif (ran('Rule classify')) steps.push('rule');\nif (ran('Classify')) steps.push('classify');\nsteps.push('faq', 'ticket', 'answer');\nsteps.push('check');\nconst llm_calls = (ran('Classify') ? 1 : 0) + 1 + 0;\nconst result = { route: '자동 답변', category, answer, sources };\nconst t = (name) => (ran(name) ? $(name).first().json.t : null);\nconst t0 = t('Start clock');\nconst marks = [['data', t('After data')], ['classify', t('After classify')], ['answer', t('After answer')], ['review', t('After review')]];\nconst timings = {};\nlet last = t0;\nfor (const [label, mark] of marks) {\n if (mark === null) continue;\n timings[`${label}_ms`] = mark - last;\n last = mark;\n}\ntimings.total_ms = Date.now() - t0;\nObject.assign(result, { llm_calls, cached: false, steps, timings });\nreturn [{ json: result }];"
},
"position": [
3960,
300
],
"id": "ddb667d7-58f4-591a-99b1-9fdee196e7a9"
},
{
"name": "Cache it?",
"type": "n8n-nodes-base.if",
"typeVersion": 2.2,
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "loose",
"version": 2
},
"conditions": [
{
"id": "c1",
"leftValue": "={{ $json.category === 'faq' && $('Cache key').first().json.use_cache }}",
"rightValue": "",
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
}
}
],
"combinator": "and"
},
"options": {}
},
"position": [
4180,
300
],
"id": "be269673-e6ef-5484-adb9-d2b266f59f97"
},
{
"name": "Store in cache",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"parameters": {
"url": "=http://data-api:8800/cache/{{ encodeURIComponent($('Cache key').first().json.key) }}",
"options": {
"response": {
"response": {
"neverError": true
}
}
},
"method": "POST",
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={{ JSON.stringify({ value: { route: $json.route, category: $json.category, answer: $json.answer, sources: $json.sources }, ttl: 600 }) }}"
},
"position": [
4400,
180
],
"id": "1d551b65-ef7f-527e-8339-ce95e2272e2d"
},
{
"name": "Result again",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "return [{ json: $('Build result').first().json }];"
},
"position": [
4620,
180
],
"id": "056a1325-c8d0-501f-9dab-599a8380748e"
},
{
"name": "Send result",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"parameters": {
"respondWith": "json",
"responseBody": "={{ $json }}",
"options": {}
},
"position": [
4840,
300
],
"id": "0bc9ba7d-cc11-5f62-a05e-107089fe53b4"
},
{
"name": "Simple answer",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"parameters": {
"jsCode": "const body = $('Question webhook').first().json.body;\nlet results = [];\ntry { results = $('Search FAQ').first().json.results ?? []; } catch (error) { results = []; }\nlet ticket = {};\ntry { ticket = $('Get ticket').first().json ?? {}; } catch (error) { ticket = {}; }\nconst isTicket = /T-?\\d{4}/i.test(String(body.question ?? ''));\nif (isTicket && ticket.status) {\n return [{ json: { route: '간단 답변', category: 'ticket', answer: `${ticket.ticket_id} 접수 건은 현재 '${ticket.status}' 상태입니다. ${ticket.note ?? ''}`.trim(),\n sources: [], llm_calls: 0, reason: 'llm_down' } }];\n}\nif (!isTicket && results.length > 0) {\n return [{ json: { route: '간단 답변', category: 'faq', answer: `${results[0].answer} (자동 답변 기능을 잠시 쓸 수 없어 FAQ 원문으로 안내합니다.)`,\n sources: [results[0].id], llm_calls: 0, reason: 'llm_down' } }];\n}\nreturn [{ json: { route: '담당자 연결', category: 'other', answer: '지금은 자동 답변을 할 수 없어 담당자에게 연결합니다.', sources: [], llm_calls: 0, reason: 'llm_down' } }];"
},
"position": [
4400,
1060
],
"id": "9d9bceef-74c6-5bea-8e09-8d6fca3dd417"
},
{
"name": "Send simple answer",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"parameters": {
"respondWith": "json",
"responseBody": "={{ $json }}",
"options": {}
},
"position": [
4620,
1060
],
"id": "3ab6f0cb-6d8f-5292-86c1-86b2645c74b5"
}
],
"connections": {
"Question webhook": {
"main": [
[
{
"node": "Has question?",
"type": "main",
"index": 0
}
]
]
},
"Has question?": {
"main": [
[
{
"node": "Start clock",
"type": "main",
"index": 0
}
],
[
{
"node": "Reject empty",
"type": "main",
"index": 0
}
]
]
},
"Start clock": {
"main": [
[
{
"node": "Cache key",
"type": "main",
"index": 0
}
]
]
},
"Cache key": {
"main": [
[
{
"node": "Cache lookup",
"type": "main",
"index": 0
}
]
]
},
"Cache lookup": {
"main": [
[
{
"node": "Cached?",
"type": "main",
"index": 0
}
]
]
},
"Cached?": {
"main": [
[
{
"node": "Cached result",
"type": "main",
"index": 0
}
],
[
{
"node": "Search FAQ",
"type": "main",
"index": 0
}
]
]
},
"Cached result": {
"main": [
[
{
"node": "Send cached",
"type": "main",
"index": 0
}
]
]
},
"Search FAQ": {
"main": [
[
{
"node": "Get ticket",
"type": "main",
"index": 0
}
],
[
{
"node": "Data down",
"type": "main",
"index": 0
}
]
]
},
"Get ticket": {
"main": [
[
{
"node": "After data",
"type": "main",
"index": 0
}
],
[
{
"node": "Data down",
"type": "main",
"index": 0
}
]
]
},
"After data": {
"main": [
[
{
"node": "Rule classify",
"type": "main",
"index": 0
}
]
]
},
"Rule classify": {
"main": [
[
{
"node": "Known?",
"type": "main",
"index": 0
}
]
]
},
"Known?": {
"main": [
[
{
"node": "Answer",
"type": "main",
"index": 0
}
],
[
{
"node": "Classify",
"type": "main",
"index": 0
}
]
]
},
"Classify model": {
"ai_languageModel": [
[
{
"node": "Classify",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Classify": {
"main": [
[
{
"node": "Parse category",
"type": "main",
"index": 0
}
],
[
{
"node": "Simple answer",
"type": "main",
"index": 0
}
]
]
},
"Parse category": {
"main": [
[
{
"node": "After classify",
"type": "main",
"index": 0
}
]
]
},
"Data down": {
"main": [
[
{
"node": "Send data down",
"type": "main",
"index": 0
}
]
]
},
"After classify": {
"main": [
[
{
"node": "Answer",
"type": "main",
"index": 0
}
]
]
},
"Answer model": {
"ai_languageModel": [
[
{
"node": "Answer",
"type": "ai_languageModel",
"index": 0
}
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"Answer": {
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],
[
{
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}
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},
"After answer": {
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{
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"Build result": {
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},
"Cache it?": {
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[
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},
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},
"Simple answer": {
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}
},
"settings": {
"executionOrder": "v1"
}
}