classic-models-agent-flows/workflows/supply-periodic-reorder.json

{
  "name": "Supply \u2014 periodic reorder proposal",
  "nodes": [
    {
      "parameters": {
        "rule": {
          "interval": [
            {
              "field": "days",
              "triggerAtHour": 6
            }
          ]
        }
      },
      "id": "every-morning",
      "name": "Every morning",
      "type": "n8n-nodes-base.scheduleTrigger",
      "typeVersion": 1.2,
      "position": [
        0,
        0
      ]
    },
    {
      "parameters": {
        "method": "POST",
        "url": "https://keycloak.sttlab.local/realms/classic-models/protocol/openid-connect/token",
        "sendBody": true,
        "contentType": "form-urlencoded",
        "bodyParameters": {
          "parameters": [
            {
              "name": "grant_type",
              "value": "client_credentials"
            },
            {
              "name": "client_id",
              "value": "classic-models-agent-supply"
            },
            {
              "name": "client_secret",
              "value": "={{ $env.SUPPLY_CLIENT_SECRET }}"
            },
            {
              "name": "scope",
              "value": "openid mcp-catalog-audience token-exchange-broker-audience"
            }
          ]
        },
        "options": {}
      },
      "id": "machine-token",
      "name": "Machine token",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        220,
        0
      ]
    },
    {
      "parameters": {
        "method": "POST",
        "url": "https://catalog-dev.sttlab.local/catalog-mcp",
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "Authorization",
              "value": "=Bearer {{ $json.access_token }}"
            },
            {
              "name": "Accept",
              "value": "application/json, text/event-stream"
            }
          ]
        },
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "{\"jsonrpc\": \"2.0\", \"id\": 1, \"method\": \"initialize\", \"params\": {\"protocolVersion\": \"2025-06-18\", \"capabilities\": {}, \"clientInfo\": {\"name\": \"supply-periodic\", \"version\": \"0.1.0\"}}}",
        "options": {
          "response": {
            "response": {
              "fullResponse": true
            }
          }
        }
      },
      "id": "mcp-initialize",
      "name": "MCP initialize",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        440,
        0
      ]
    },
    {
      "parameters": {
        "method": "POST",
        "url": "https://catalog-dev.sttlab.local/catalog-mcp",
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "Authorization",
              "value": "=Bearer {{ $('Machine token').item.json.access_token }}"
            },
            {
              "name": "Accept",
              "value": "application/json, text/event-stream"
            },
            {
              "name": "mcp-session-id",
              "value": "={{ $json.headers['mcp-session-id'] }}"
            }
          ]
        },
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "{\"jsonrpc\": \"2.0\", \"id\": 2, \"method\": \"tools/call\", \"params\": {\"name\": \"list-products\", \"arguments\": {\"query_page\": 1, \"query_page_size\": 200}}}",
        "options": {
          "response": {
            "response": {
              "neverError": true
            }
          }
        }
      },
      "id": "list-products",
      "name": "List products",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        660,
        0
      ],
      "alwaysOutputData": true
    },
    {
      "parameters": {
        "jsCode": "// Which references need a purchase order, and why.\n//\n// The proposal is computed and goes no further, because there is nowhere for it\n// to go: the classicmodels schema has no purchase order, no supplier entity \u2014\n// `productvendor` is a string on the product \u2014 and the catalog's only write\n// tool is create-product, which is the Catalogue agent's business, not this\n// one's. So this run escalates rather than writing, which is also what an\n// autonomous agent meeting a decision it cannot take is supposed to do.\nconst THRESHOLD = 50;\nconst COVER = 3;   // reorder up to three times the threshold\n\nconst item = $input.first();\nconst raw = item?.json ?? {};\nconst body = typeof raw === 'string' ? raw : (raw.data ?? JSON.stringify(raw));\nconst line = String(body).split('\\n').find((l) => l.startsWith('data:'));\nif (!line) {\n  return [{ json: { proposals: [], escalate: true,\n                    reason: 'The catalog did not answer in the expected shape.' }}];\n}\n\nlet rpc;\ntry { rpc = JSON.parse(line.slice(5).trim()); }\ncatch (e) { return [{ json: { proposals: [], escalate: true,\n                              reason: \"The catalog's reply could not be read.\" }}]; }\n\n// A tool failure is a successful result carrying isError, not a JSON-RPC error.\nif (rpc.error || rpc.result?.isError) {\n  const why = rpc.error?.message ?? rpc.result?.content?.[0]?.text ?? 'unknown';\n  return [{ json: { proposals: [], escalate: true,\n                    reason: `The catalog refused the read: ${why}` }}];\n}\n\nconst page = JSON.parse(rpc.result.content[0].text);\nconst products = page.results ?? [];\nconst scanned = products.length;\nconst total = page.count ?? scanned;\n\nconst proposals = products\n  .filter((p) => Number(p.quantityinstock) < THRESHOLD)\n  .map((p) => ({\n    productcode: p.productcode,\n    productname: p.productname,\n    vendor: p.productvendor,\n    on_hand: Number(p.quantityinstock),\n    propose_order: THRESHOLD * COVER - Number(p.quantityinstock),\n  }));\n\nreturn [{ json: {\n  proposals,\n  scanned,\n  // Loud when the scan was partial: a proposal set computed from part of the\n  // catalog looks exactly like one computed from all of it.\n  complete: scanned >= total,\n  escalate: proposals.length > 0 || scanned < total,\n  reason: scanned < total\n    ? `Scanned ${scanned} of ${total} references; the rest were not read.`\n    : (proposals.length\n        ? `${proposals.length} reference(s) below the threshold of ${THRESHOLD}. `\n          + 'Nowhere to record a purchase order \u2014 the domain has no such concept \u2014 '\n          + 'so this needs a human.'\n        : 'Nothing below the threshold.'),\n}}];\n"
      },
      "id": "propose-reorders",
      "name": "Propose reorders",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        880,
        0
      ]
    }
  ],
  "connections": {
    "Every morning": {
      "main": [
        [
          {
            "node": "Machine token",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Machine token": {
      "main": [
        [
          {
            "node": "MCP initialize",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "MCP initialize": {
      "main": [
        [
          {
            "node": "List products",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "List products": {
      "main": [
        [
          {
            "node": "Propose reorders",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "settings": {
    "executionOrder": "v1"
  }
}