Voyage-Context-3 エンベディングと MongoDB Atlas に基づくドキュメントQ&Aシステム

• •MongoDB接続文字列
• •ターゲットAPIの認証情報が必要な場合あり
• •OpenAI API Key

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      "parameters": {
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      "parameters": {
        "workflowInputs": {
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      "id": "6f3c7ef8-891e-4dd4-bbf0-4adf6e193532",
      "name": "類似性検索を実行",
      "type": "n8n-nodes-base.mongoDb",
      "position": [
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      ],
      "parameters": {
        "query": "={{\n([\n  {\n    \"$vectorSearch\": {\n      \"index\": \"vector_index\",\n      \"path\": \"embeddings\",\n      \"queryVector\": $json.data[0].data[0].embedding,\n      \"numCandidates\": 150,\n      \"limit\": 10\n    }\n  },\n  {\n    \"$project\": {\n      \"_id\": 0,\n      \"text\": 1,\n      \"metadata\": 1,\n      \"score\": {\n        \"$meta\": \"vectorSearchScore\"\n      }\n    }\n  }\n]).toJsonString()\n}}",
        "operation": "aggregate",
        "collection": "documents"
      },
      "credentials": {
        "mongoDb": {
          "id": "OUucWo4Fut06mJ1J",
          "name": "MongoDB account"
        }
      },
      "typeVersion": 1.2
    },
    {
      "id": "1a41d58f-b8fc-498f-a807-ffc3edd400ed",
      "name": "ページ番号を追加",
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      "id": "5af13dae-29e2-4f6f-a8e8-96cf9d01569e",
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      "name": "クエリを取得",
      "type": "n8n-nodes-base.set",
      "position": [
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      ],
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    },
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      "name": "質問をループ処理",
      "type": "n8n-nodes-base.splitInBatches",
      "position": [
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      ],
      "parameters": {
        "options": {}
      },
      "typeVersion": 3
    },
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      ],
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        "options": {
          "systemPromptTemplate": "You are a helpful assistant helping a user research a paper titled \"Large Language Models: A Survey\".\n\nYour task is to generate 2 clarifying questions for the user's query so that later search queries can be better refined."
        },
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    },
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      "id": "581a9f27-dc41-40c2-8d91-ace13e3675a0",
      "name": "簡易確認",
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      ],
      "parameters": {
        "message": "Thanks. Please wait whilst I search the relevant document.",
        "options": {},
        "waitUserReply": false
      },
      "typeVersion": 1
    },
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      "id": "0c9b0917-b3c2-4c8d-9825-1db4e07b8449",
      "name": "回答を集計",
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        "aggregate": "aggregateAllItemData",
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    },
    {
      "id": "ea32ae52-d7ec-4f35-8ef8-04842d3cce72",
      "name": "ユーザーに応答",
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      ],
      "parameters": {
        "message": "={{ $json.message.content.answer }}",
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    },
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      "id": "931f6b89-1c5a-4865-a0cc-3264795ef498",
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      ],
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          "mode": "list",
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        "messages": {
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              "role": "system",
              "content": "=You are a helpful assistant. The user session involves answering user question against a research paper. Refer and use only the <documents> context to answer the user questions."
            },
            {
              "role": "assistant",
              "content": "=<documents>{{ $json.data.toJsonString() }}</document>"
            },
            {
              "content": "={{\n$('Get Query').first().json.query\n    + ' '\n    + $('Aggregate Answers').first().json.answers.map(item => item.chatInput).join(' ')\n}}"
            }
          ]
        },
        "jsonOutput": true
      },
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    {
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      "name": "ページ番号で文書を取得",
      "type": "n8n-nodes-base.mongoDbTool",
      "position": [
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      ],
      "parameters": {
        "query": "={\n    \"metadata.pageNumber\": {{ $fromAI(\"pageNumber\", \"the page number to fetch\", \"number\") }}\n    \"embedding\": { \"$exists\": false } // Second condition: ensure 'embedding' key does not exist\n  },\n  {\n    \"text\": 1,\n    \"metadata\": 1\n  }",
        "options": {},
        "collection": "documents",
        "descriptionType": "manual",
        "toolDescription": "Call this tool to fetch a full document page by pageNumber. This could be useful for more deep dive context."
      },
      "credentials": {
        "mongoDb": {
          "id": "OUucWo4Fut06mJ1J",
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      },
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      "id": "32dd62cd-f55b-4f43-907f-687e30b91e20",
      "name": "コンテンツとメタデータを結合",
      "type": "n8n-nodes-base.set",
      "position": [
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              "name": "metadata",
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    },
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      "id": "cc7eab07-bae3-4838-bdca-45db86e2c734",
      "name": "文書ページを挿入",
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      "position": [
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      ],
      "parameters": {
        "fields": "text,metadata",
        "options": {},
        "operation": "insert",
        "collection": "documents"
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        }
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      ],
      "parameters": {
        "mode": "chooseBranch"
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      "typeVersion": 3.2
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      "name": "簡易更新",
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      "position": [
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        528
      ],
      "parameters": {
        "message": "={{\n(function(numResults) {\n  const replies = [\n    `Okay, I've found ${numResults} result${numResults === 1 ? '' : 's'}.`,\n    `Summarizing ${numResults} result${numResults === 1 ? '' : 's'}...`,\n    `Okay, give me a second to review these ${numResults} result${numResults === 1 ? '' : 's'}`\n  ];\n  return replies[Math.floor((Math.random() * replies.length) + 1)];\n}($json.data.length))\n}}",
        "options": {},
        "waitUserReply": false
      },
      "typeVersion": 1
    },
    {
      "id": "1fe9a7c0-40e6-4150-8741-f6fcc9532013",
      "name": "付箋",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -416,
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      ],
      "parameters": {
        "color": 7,
        "width": 624,
        "height": 448,
        "content": "## 1. Starting Fresh\nTo begin, we'll define our document URL to process. Since we breaking down the document in full and don't want duplicate entries in our database the next time we run this ingestion step, we'll clear the our MongoDB Collection and start fresh."
      },
      "typeVersion": 1
    },
    {
      "id": "ed5cb8a7-381d-430d-a30f-15d04f60b35b",
      "name": "付箋1",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        240,
        -544
      ],
      "parameters": {
        "color": 7,
        "width": 800,
        "height": 448,
        "content": "## 2. Download Paper and Split Into Pages\n[Read more about the HTTP node](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.httprequest)\n\nA common way to extract from a PDF is to use the \"Extract from File\" node. This will return the file's metadata as well as the text split into pages - which is exactly what we need for this particular flow. Note however, if charts and images are also required to be searchable then you may need to use a vision model to properly parse these elements."
      },
      "typeVersion": 1
    },
    {
      "id": "72a31986-7c5e-4600-8c97-63e5cd92a2c1",
      "name": "付箋2",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        1072,
        -544
      ],
      "parameters": {
        "color": 7,
        "width": 832,
        "height": 448,
        "content": "## 3. For Large Documents, Use Subworkflows for Better Performance\n[Learn more about Subworkflows](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.executeworkflow)\n\nFor practical applications, smaller executions are generally preferred to help reduce out-of-memory issues in n8n. This is especially so when working with sizable documents and embedding vectors. In this particular setup, we'll process each page separately and in sequence. Though this will take longer, it can ensure our instance's stability for other workflows."
      },
      "typeVersion": 1
    },
    {
      "id": "0918ad0c-7c8e-473f-900f-194c617132c0",
      "name": "付箋3",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        1968,
        -544
      ],
      "parameters": {
        "color": 7,
        "width": 736,
        "height": 640,
        "content": "## 4. Contextual Embeddings Using Voyage-Context-3\n[Learn more about Voyage-Context-3](https://blog.voyageai.com/2025/07/23/voyage-context-3/)\n\nVoyage-Context-3 is a new contextual chunk embedding model which allows you to include document context to improve retrieval accuracy. Whereas previously you may have had to manually augment incoming chunks, Voyage-Context-3 does this automatically by allowing your to bulk upload chunks and encoding context from the aggregate of all.\n\nFor this demonstration, we won't use the full document - that's a lot of data! - but rather, we'll embed sets of 3 sequential pages. This should be enough to cover at least \"chapter\"-level context. "
      },
      "typeVersion": 1
    },
    {
      "id": "89b50026-e35d-40cb-9c16-9094d36f7ae3",
      "name": "付箋4",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        2736,
        -544
      ],
      "parameters": {
        "color": 7,
        "width": 1024,
        "height": 768,
        "content": "## 5. Store Vectors and Full Page Text for Advanced RAG Search\n[Learn about MongoDB node](https://docs.n8n.io/integrations/builtin/app-nodes/n8n-nodes-base.mongodb)\n\nWe'll insert these context-aware embedding chunks into our MongoDB Atlas Vector Store along with their equivalent text content and metadata. Additionally, we can also store the full page text in Mongo as well - as we're able to later filter by page number, this can be a handy way of expanding on chunks later on in our searches."
      },
      "typeVersion": 1
    },
    {
      "id": "f7c73904-bf8a-4b7f-bd07-17e43e1bd51d",
      "name": "文書ベクトルを挿入",
      "type": "n8n-nodes-base.mongoDb",
      "position": [
        3360,
        -208
      ],
      "parameters": {
        "fields": "text,embeddings,metadata",
        "options": {},
        "operation": "insert",
        "collection": "documents"
      },
      "credentials": {
        "mongoDb": {
          "id": "OUucWo4Fut06mJ1J",
          "name": "MongoDB account"
        }
      },
      "typeVersion": 1.2
    },
    {
      "id": "f43c511b-b0fc-43a0-b870-dc74175469fa",
      "name": "付箋5",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -144,
        272
      ],
      "parameters": {
        "color": 7,
        "width": 1328,
        "height": 640,
        "content": "## 6. Asking Clarifying Questions For Contextual Search\n[Read more about Respond To Chat](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-langchain.chat)\n\n**Respond to Chat** is a new Human-in-the-loop node where by the \"Human\" isn't an external source but the active user instead! This can make for really interesting multi-turn chat interactions which can feel more personalised and thus improving the user experience.\n\nFor this demonstration, we'll implement a \"clarifying questions\" loop where a set of questions are presented to the user to answer. These questions can help refine the context of the user's query and produce better search results so it's a really useful technique to know. Once the questions are answered, we can again use the \"respond to chat\" node to give a quick acknowledgement but this time with the \"wait for reply\" toggled off - this essentially becomes a \"send message\" operation."
      },
      "typeVersion": 1
    },
    {
      "id": "43848d5f-2b2c-4698-8aef-940b9b968ade",
      "name": "付箋6",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        1216,
        272
      ],
      "parameters": {
        "color": 7,
        "width": 880,
        "height": 640,
        "content": "## 2. MongoDB Atlas Vector Search Using Voyage-Context-3\n[Learn more about MongoDB $vectorSearch queries](https://www.mongodb.com/docs/atlas/atlas-vector-search/vector-search-stage/)\n\nThere's not an official MongoDB vector store node support so we'll have to write raw queries using the MongoDB node. Good thing that they're not really that hard to write once you get over the initial learning curve. Again we'll use Voyage-Context-3 on our query to match the embeddings in our vector store.\n\nOnce the documents are matched, we can use the \"respond to chat\" node to send a quick progress message to the user. These micro-updates can help break up long pauses between user questions and agent responses and provide a feeling of responsiveness.\n"
      },
      "typeVersion": 1
    },
    {
      "id": "72773183-6b21-4726-88aa-4c5dc09fd8b6",
      "name": "付箋7",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        2128,
        272
      ],
      "parameters": {
        "color": 7,
        "width": 784,
        "height": 640,
        "content": "## 3. Q&A Agent using OpenAI GPT-4.1-Mini\n[Read more about the OpenAI node](https://docs.n8n.io/integrations/builtin/app-nodes/n8n-nodes-langchain.openai)\n\nUsing the retrieved documents with our AI agent completes our Q&A agent flow and let's us respond to the user's query with unmatched relevancy and accuracy - or so we've been promised! Of course, you can't really tell unless you try it out for yourself.\n\nIn testing this workflow, I did find the ranking of retrieved documents to be better than naive document chunking. I could definitely recommend this contextual embeddings approach for the more demanding RAG requirements."
      },
      "typeVersion": 1
    },
    {
      "id": "ce5101b3-4ec0-4dcf-804e-1cc9f72a8b6e",
      "name": "コレクションをクリア",
      "type": "n8n-nodes-base.mongoDb",
      "position": [
        32,
        -336
      ],
      "parameters": {
        "query": "={ \"metadata.url\": \"{{ $json.url }}\" }",
        "operation": "delete",
        "collection": "documents"
      },
      "credentials": {
        "mongoDb": {
          "id": "OUucWo4Fut06mJ1J",
          "name": "MongoDB account"
        }
      },
      "typeVersion": 1.2
    },
    {
      "id": "f9ed9fd9-d85a-43fd-b87c-4e30c9fdab72",
      "name": "グループごとに処理",
      "type": "n8n-nodes-base.splitInBatches",
      "position": [
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      ],
      "parameters": {
        "options": {
          "reset": "={{ $('For Each Group').context.done }}"
        }
      },
      "typeVersion": 3
    },
    {
      "id": "edb8c7d0-d909-42b9-bfd3-17e0c3c59efe",
      "name": "何も実行しない",
      "type": "n8n-nodes-base.noOp",
      "position": [
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      "parameters": {},
      "typeVersion": 1
    },
    {
      "id": "027cca87-9697-4923-88d4-23df75ae4d0e",
      "name": "分割出力1",
      "type": "n8n-nodes-base.splitOut",
      "position": [
        3008,
        -208
      ],
      "parameters": {
        "options": {},
        "fieldToSplitOut": "data"
      },
      "typeVersion": 1
    },
    {
      "id": "5fbf397a-9054-42e0-890b-28b514e20c99",
      "name": "集計1",
      "type": "n8n-nodes-base.aggregate",
      "position": [
        3536,
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      "parameters": {
        "options": {},
        "aggregate": "aggregateAllItemData"
      },
      "typeVersion": 1
    },
    {
      "id": "2a706685-6ed5-4760-9127-db8608dc542d",
      "name": "付箋9",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
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      "parameters": {
        "width": 608,
        "height": 944,
        "content": "## Contextual Chunk Embeddings Using Voyage-Context-3 and Mongo Atlas\n\n**On my never-ending quest to find the best embeddings model, I was intrigued to come across [Voyage-Context-3](https://blog.voyageai.com/2025/07/23/voyage-context-3/) by MongoDB and was excited to give it a try.**\n\nThis template implements the embedding model on a Arxiv research paper and stores the results in a Vector store. It was only fitting to use Mongo Atlas from the same parent company. This template also includes a RAG-based Q&A agent which taps into the vector store as a test to helps qualify if the embeddings are any good and if this is even noticeable.\n\n\n### How it works\nThis template is split into 2 parts. The first part being the import of a research document which is then chunked and embedded into our vector store. The second part builds a RAG-based Q&A agent to test the vector store retrieval on the research paper.\n\nRead the steps for more details.\n\n### How to use\n* First ensure you create a Voyage account [voyageai.com](https://voyageai.com) and a MongoDB database ready.\n* Start with Step 1 and fill in the \"Set Variables\" node and Click on the Manual Execute Trigger. This will take care of populating the vector store with the research paper.\n* To use the Q&A agent, it is required to publish the workflow to access the public chat interface. This is because \"Respond to Chat\" works best in this mode and not in editor mode.\n* To use for your own document, edit the \"Set Variables\" node to define the URL to your own document.\n* This embeddings approach should work best on larger documents.\n\n### Requirements\n* [Voyageai.com](https://voyageai.com) account for embeddings. You may need to add credit to get a reasonable RPM for this workflow.\n* MongoDB database either self-hosted or online at [https://www.mongodb.com](https://www.mongodb.com).\n* OpenAI account for RAG Q&A agent.\n\n### Need Help?\nJoin the [Discord](https://discord.com/invite/XPKeKXeB7d) or ask in the [Forum](https://community.n8n.io/)!\n\nHappy Hacking!"
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      "name": "付箋10",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
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      ],
      "parameters": {
        "width": 608,
        "height": 336,
        "content": "![](https://cdn.subworkflow.ai/n8n-templates/banner_595x311.png#full-width)"
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