ragjson-zvec

ragjson-zvec

MCP server for semantic search over local knowledge bases, powered by zvec vector database. It consumes change files (.mushroom) and provides a 'query' tool for retrieval.

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README

ragjson-zvec

基于 zvec 向量数据库的 RAG MCP Server。消费 .mushroom 变更文件,通过 MCP 协议提供语义检索服务。

架构

rag update -r              ragjson-zvec                    MCP Client
─────────────              ────────────                    ──────────
解析 → 切片 → 嵌入    →    定时采蘑菇 → zvec         →    query(text, topn)
写 .ragjson                启动时立即同步一轮               返回 content + source + score
写 .mushroom               之后每 N 秒扫描一次
                           消费后删除蘑菇

三个环节通过文件解耦,进程间无直接依赖。

快速开始

前置条件

  • ~/.rag.config 配置文件(embedding API)
  • 知识库已由 rag update 处理过(存在 .ragjson.mushroom 文件)

配置

~/.rag.config

{
  "embedding_model": {
    "base_url": "https://dashscope.aliyuncs.com/compatible-mode/v1",
    "api_key": "sk-...",
    "model_name": "text-embedding-v4",
    "dimension": 768
  }
}

安装

uv sync

使用

stdio 模式(推荐,client 自动启动 server 子进程):

uv run ragjson-zvec-client \
  --kb-root ~/knowledge-base \
  --db-path ~/vector-db

HTTP 模式(需要先手动启动 server):

# 终端 1:启动 server
uv run ragjson-zvec \
  --kb-root ~/knowledge-base \
  --db-path ~/vector-db \
  --transport sse --host 0.0.0.0 --port 8000

# 终端 2:client 连接
uv run ragjson-zvec-client \
  --transport sse \
  --url http://localhost:8000/sse

接入 Claude Desktop

{
  "mcpServers": {
    "ragjson-zvec": {
      "command": "uv",
      "args": [
        "run", "--directory", "/path/to/ragjson-zvec",
        "ragjson-zvec",
        "--kb-root", "/path/to/knowledge-base",
        "--db-path", "/path/to/vector-db"
      ]
    }
  }
}

CLI 参考

ragjson-zvec (server)

usage: ragjson-zvec [options]

必选参数:
  --kb-root PATH          知识库根目录
  --db-path PATH          向量数据库存储目录

可选参数:
  --index-type TYPE       索引类型: flat | hnsw(默认 flat,仅新建库时生效)
  --sync-interval INT     蘑菇同步间隔秒数(默认 60)
  --config PATH           配置文件路径(默认 ~/.rag.config)
  --transport MODE        传输模式: stdio | sse | streamable-http(默认 stdio)
  --host HOST             HTTP 监听地址(默认 127.0.0.1)
  --port INT              HTTP 监听端口(默认 8000)

ragjson-zvec-client (调试客户端)

usage: ragjson-zvec-client [options]

传输模式:
  --transport MODE        stdio | sse | streamable-http(默认 stdio)

stdio 模式参数(自动启动 server):
  --kb-root PATH          知识库根目录
  --db-path PATH          向量数据库存储目录
  --index-type TYPE       索引类型: flat | hnsw(默认 flat)
  --sync-interval INT     同步间隔秒数(默认 60)
  --config PATH           配置文件路径

HTTP 模式参数(连接已运行的 server):
  --url URL               Server URL(如 http://localhost:8000/sse)
  --host HOST             Server 地址(默认 127.0.0.1)
  --port INT              Server 端口(默认 8000)

交互式命令:
  /tools                  列出可用 tools
  /topn N                 设置返回条数(默认 5)
  /quit                   退出
  (任意文本)              搜索知识库

MCP Tool: query

query(text: str, topn: int = 5) -> str
参数 类型 默认值 说明
text str (必填) 查询文本
topn int 5 返回最相似的前 N 条结果

返回 JSON 数组,每条包含:

[
  {
    "content": "chunk 原文内容",
    "source": "docs/readme.md",
    "score": 0.123456
  }
]
  • score:余弦距离,越小越相似(0 = 完全匹配)
  • source:源文件相对知识库根目录的路径

知识库目录结构

server 期望知识库包含 .rag/ 目录,其中有 .ragjson.mushroom 文件(由 rag update 生成):

~/knowledge-base/
├── docs/
│   ├── .rag/
│   │   ├── readme.md.ragjson              ← 切片 + 向量数据
│   │   └── 20260715T120000Z.mushroom      ← 变更通知(会被消费并删除)
│   └── readme.md                          ← 源文件
└── src/
    ├── .rag/
    │   └── app.js.ragjson
    └── app.js

工作原理

  1. 启动时:立即执行一轮蘑菇同步,然后启动定时任务
  2. 定时同步:每 N 秒扫描 **/.rag/*.mushroom,按时间戳顺序处理
    • upsert 事件:删除旧 chunks → 读 .ragjson → 解码 base64 向量 → 写入 zvec
    • delete 事件:删除该 source 的所有 chunks
    • 成功后删除蘑菇文件;失败则保留,下次重试(幂等操作)
  3. 查询时:embedding 查询文本 → zvec 向量检索 → 返回 topn 结果

项目结构

src/ragjson_zvec/
├── __init__.py
├── __main__.py          # Server CLI 入口
├── config.py            # ~/.rag.config 加载
├── embedding.py         # QwenDenseEmbedding 封装
├── collection.py        # zvec collection 管理
├── indexer.py           # 蘑菇扫描 + zvec 同步
├── server.py            # MCP server + query tool
└── client.py            # MCP 调试客户端

依赖

  • zvec — 阿里巴巴开源的进程内向量数据库
  • mcp — Model Context Protocol SDK

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