{
  "name": "Approvisionnement \u2014 check_availability",
  "nodes": [
    {
      "parameters": {
        "httpMethod": "POST",
        "path": "check-availability",
        "responseMode": "responseNode",
        "options": {}
      },
      "id": "webhook",
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 2,
      "position": [
        0,
        0
      ],
      "webhookId": "check-availability"
    },
    {
      "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": "urn:ietf:params:oauth:grant-type:token-exchange"
            },
            {
              "name": "client_id",
              "value": "classic-models-agent-approvisionnement"
            },
            {
              "name": "client_secret",
              "value": "={{ $env.APPROVISIONNEMENT_CLIENT_SECRET }}"
            },
            {
              "name": "subject_token",
              "value": "={{ $('Webhook').item.json.headers['x-subject-token'] }}"
            },
            {
              "name": "subject_token_type",
              "value": "urn:ietf:params:oauth:token-type:access_token"
            },
            {
              "name": "scope",
              "value": "openid mcp-catalog-audience token-exchange-broker-audience"
            }
          ]
        },
        "options": {}
      },
      "id": "exchange-token",
      "name": "Exchange 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\": \"approvisionnement\", \"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 {{ $('Exchange 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": "={{ JSON.stringify({ jsonrpc: '2.0', id: 2, method: 'tools/call', params: { name: 'get-product', arguments: { path_productcode: $('Decide the product').item.json.productcode } } }) }}",
        "options": {
          "response": {
            "response": {
              "neverError": true
            }
          }
        }
      },
      "id": "read-stock",
      "name": "Read stock",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        660,
        0
      ],
      "alwaysOutputData": true
    },
    {
      "parameters": {
        "jsCode": "// Pull the product code out of the question.\n//\n// Deliberately loose on the part after the underscore: a reference that\n// looks like one but does not exist must reach the catalog and come back\n// as \"no such product\". Rejecting it here would answer \"you named no\n// product\", which is false and sends the caller looking in the wrong place.\n//\n// A regex rather than a model: this agent's critical path is rules, and putting\n// an LLM on it would make a nightly job both slower and less predictable. If the\n// question does not name a product, the agent escalates instead of guessing \u2014\n// an autonomous agent that meets an ambiguity must hand it back, never resolve\n// it on its own.\nconst question = $('Webhook').first().json.body?.question ?? '';\nconst match = question.match(/\\bS\\d+_[A-Za-z0-9]+\\b/);\nif (!match) {\n  return [{ json: { productcode: null, question } }];\n}\nreturn [{ json: { productcode: match[0], question } }];\n"
      },
      "id": "decide-the-product",
      "name": "Decide the product",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        220,
        180
      ]
    },
    {
      "parameters": {
        "jsCode": "// Turn the MCP reply into a decision.\n//\n// An A2A call returns an answer, not data: the caller learns whether the stock\n// covers what it asked about, and never receives the stock table. That is what\n// keeps this agent from becoming a read proxy onto the catalog domain.\nconst THRESHOLD = 50;   // below this, a reorder is due before promising anything\n\nconst decided = $('Decide the product').first().json;\nif (!decided.productcode) {\n  return [{ json: {\n    answer: 'No product reference in the question. Name one as S10_1949 and ask again.',\n    escalate: true,\n  }}];\n}\n\nconst item = $('Read stock').first();\nif (!item) {\n  return [{ json: {\n    answer: `The catalog returned nothing for ${decided.productcode}. It may not exist.`,\n    escalate: true,\n  }}];\n}\nconst raw = item.json ?? {};\nconst body = typeof raw === 'string' ? raw : (raw.data ?? JSON.stringify(raw));\n\n// The endpoint answers as an SSE event, so the JSON sits on a `data:` line.\nconst line = String(body).split('\\n').find((l) => l.startsWith('data:'));\nif (!line) {\n  return [{ json: {\n    answer: `Could not read the catalog's reply for ${decided.productcode}.`,\n    escalate: true,\n  }}];\n}\n\nlet rpc;\ntry {\n  rpc = JSON.parse(line.slice(5).trim());\n} catch (e) {\n  return [{ json: {\n    answer: `The catalog's reply for ${decided.productcode} could not be read.`,\n    escalate: true,\n  }}];\n}\n\n// A JSON-RPC `error` is a protocol failure \u2014 a malformed call, a session gone.\nif (rpc.error) {\n  return [{ json: {\n    answer: `The catalog refused the read for ${decided.productcode}: ${rpc.error.message}.`,\n    escalate: true,\n  }}];\n}\n\n// A *tool* failure is not that. MCP reports it as a perfectly successful result\n// carrying `isError: true`, with the reason as text \u2014 so a client that only\n// checks `error` reads a failure as data and tries to parse \"HTTP call failed\n// with status 404\" as a product. Which is exactly what this did.\nconst text = rpc.result?.content?.[0]?.text ?? '';\nif (rpc.result?.isError) {\n  const missing = text.includes('404');\n  return [{ json: {\n    answer: missing\n      ? `There is no product ${decided.productcode} in the catalog.`\n      : `The catalog could not answer for ${decided.productcode}: ${text}`,\n    escalate: true,\n  }}];\n}\n\nlet product;\ntry {\n  product = JSON.parse(text);\n} catch (e) {\n  return [{ json: {\n    answer: `The catalog returned something unreadable for ${decided.productcode}.`,\n    escalate: true,\n  }}];\n}\nconst stock = Number(product.quantityinstock);\nconst available = stock >= THRESHOLD;\n\n// What the reactive half noticed, if anything. `product.stock_changed` is\n// consumed as it happens, so a crossing that occurred twenty minutes ago is\n// known here \u2014 and \"it fell below this afternoon, under demand\" is a different\n// decision from \"it has been sitting below for a month\".\n//\n// Read from the watchlist, and absent if the watchlist could not be read: an\n// availability answer must not depend on it.\nlet movement = null;\ntry {\n  const watch = $('Recent movement').first()?.json ?? {};\n  movement = (watch.entries ?? []).find((e) => e.productcode === product.productcode) ?? null;\n} catch (e) {\n  movement = null;\n}\n\n// Only while the reference is still low. An entry stays on the watchlist until\n// a human clears it, so a reference that has since been restocked still has\n// one \u2014 and \"300 in stock \u2026 it crossed the threshold, from 68\" reads as a\n// contradiction even though both halves are true.\nlet context = '';\nif (movement && !available) {\n  const when = movement.last_movement_at ?? movement.observed_at;\n  const driver = movement.driver === 'demand'\n    ? 'driven by orders'\n    : 'a stock correction, not demand';\n  context = movement.stock_out\n    ? ` It ran out at ${when} (${driver}).`\n    : ` It crossed the threshold at ${when} (${driver}), from ${movement.was}.`;\n}\n\n// Stock on hand only. Quantities already committed on unshipped orders are\n// NOT deducted, and the answer says so rather than implying a certainty it does\n// not have: the sales API cannot be filtered by product code, so working it out\n// would mean paging the whole orderdetails table on every question \u2014 sixty\n// pages, for one answer. See the backlog note in CLAUDE.md.\nconst basis = 'stock on hand; quantities committed on open orders are not deducted';\n\nreturn [{ json: {\n  answer: available\n    ? `Yes \u2014 ${product.productname} (${product.productcode}) can be promised: `\n      + `${stock} in stock, above the reorder threshold of ${THRESHOLD}. `\n      + `Basis: ${basis}.${context}`\n    : `No \u2014 ${product.productname} (${product.productcode}) is down to ${stock}, `\n      + `below the reorder threshold of ${THRESHOLD}. A reorder is due before it can be promised. `\n      + `Basis: ${basis}.${context}`,\n  escalate: false,\n}}];\n"
      },
      "id": "answer",
      "name": "Answer",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        880,
        0
      ]
    },
    {
      "parameters": {
        "respondWith": "json",
        "responseBody": "={{ JSON.stringify($json) }}",
        "options": {}
      },
      "id": "respond",
      "name": "Respond",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.1,
      "position": [
        1100,
        0
      ]
    },
    {
      "parameters": {
        "method": "GET",
        "url": "http://n8n.n8n.svc.cluster.local/webhook/stock-watchlist",
        "options": {
          "timeout": 5000
        }
      },
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        1100,
        0
      ],
      "id": "recent-movement",
      "name": "Recent movement",
      "onError": "continueRegularOutput",
      "alwaysOutputData": true
    }
  ],
  "connections": {
    "Webhook": {
      "main": [
        [
          {
            "node": "Decide the product",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Decide the product": {
      "main": [
        [
          {
            "node": "Exchange token",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Exchange token": {
      "main": [
        [
          {
            "node": "MCP initialize",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "MCP initialize": {
      "main": [
        [
          {
            "node": "Read stock",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Read stock": {
      "main": [
        [
          {
            "node": "Recent movement",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Answer": {
      "main": [
        [
          {
            "node": "Respond",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Recent movement": {
      "main": [
        [
          {
            "node": "Answer",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "settings": {
    "executionOrder": "v1"
  }
}