find-a-book-mcp

An MCP (Model Context Protocol) server for searching and downloading books from Library Genesis. Works with Claude Code, Claude Desktop, and any MCP-compatible AI agent.

Tools

get_formats

Search for a book and return all available formats grouped by unique title + author. Instead of many duplicate rows, each book appears once with a list of all available formats (EPUB / MOBI / PDF / AZW3, etc.) and their MD5s. Fetches up to 75 results in parallel for comprehensive coverage.

Parameters:

• query (string, required) — Book title, author, or keywords

Returns:

[
  {
    "title": "Harry Potter and the Philosopher's Stone",
    "author": "J.K. Rowling",
    "publisher": "Bloomsbury",
    "year": "2015",
    "language": "English",
    "formats": [
      { "extension": "EPUB", "size": "920 kB", "size_bytes": 942080, "md5": "D7FF6458..." },
      { "extension": "MOBI", "size": "1.1 MB", "size_bytes": 1153433, "md5": "A3CC9012..." }
    ]
  }
]

search_books

Search for books by title, author, or keywords. Returns 5 results per page with pagination support.

Parameters:

• query (string, required) — Book title, author, or keywords

• page (number, optional, default 1) — Display page number (5 results per page)

• extensions (string[], optional) — Filter by format, e.g. ["epub", "pdf", "mobi"]

Returns:

{
  "books": [
    {
      "title": "...",
      "author": "...",
      "publisher": "...",
      "year": "2021",
      "language": "Chinese",
      "extension": "EPUB",
      "size": "920 kB",
      "size_bytes": 942080,
      "md5": "D7FF6458..."
    }
  ],
  "displayPage": 1,
  "totalDisplayPages": 10,
  "totalCount": 50,
  "hasMore": true,
  "hasPrev": false
}

download_book

Download a book by its MD5 hash. Automatically tries multiple mirrors in order: libgen.li → libgen.rs → libgen.st → library.lol.

Parameters:

• md5 (string, required) — MD5 hash from search results

• title (string, optional) — Book title, used for the filename

Returns: Local file path, filename, size in bytes, and format extension.

Related MCP server: Lyceum

Installation

Claude Code / Claude Desktop

Add to your settings.json:

{
  "mcpServers": {
    "find-a-book": {
      "command": "npx",
      "args": ["-y", "github:Xiaochengzi2048/find-a-book-mcp"]
    }
  }
}

Manual

git clone https://github.com/Xiaochengzi2048/find-a-book-mcp
cd find-a-book-mcp
npm install
node server.js

How It Works

1. Search — Scrapes LibGen HTML (no API key or account required); tries libgen.li → libgen.rs → libgen.st automatically

2. Paginate — LibGen returns 25 results per server page; this server presents 5 per display page with hasMore/hasPrev flags for navigation

3. Download — Two-step: fetch a one-time key from ads.php, then download via get.php; falls back through all mirrors then library.lol on failure

4. Save — File saved to system temp directory (/tmp/) with a timestamped filename to avoid collisions

Notes

• No account or API key required

• Supports EPUB, MOBI, PDF, AZW3, FB2, DJVU, and more

• size_bytes field lets callers decide delivery method (e.g. direct send vs. link for large files)

• Downloaded files are saved to /tmp/ — move them as needed

• Mirror failures are logged to stderr for easy debugging

find-a-book-mcp（中文说明）

基于 Library Genesis 的 MCP 工具服务，支持搜索和下载电子书。兼容 Claude Code、Claude Desktop 及所有支持 MCP 协议的 AI Agent。

工具说明

get_formats — 按格式汇总

搜索一本书，将所有重复条目按「书名 + 作者」归并，每本书只出现一次，并列出所有可用格式（EPUB / MOBI / PDF / AZW3 等）及其 MD5。并行抓取最多 75 条结果，覆盖更全面。

参数：

• query（必填）— 书名、作者或关键词

返回示例：

[
  {
    "title": "置身事内",
    "author": "兰小欢",
    "year": "2021",
    "language": "Chinese",
    "formats": [
      { "extension": "EPUB", "size": "2.3 MB", "size_bytes": 2411724, "md5": "..." },
      { "extension": "PDF",  "size": "8.1 MB", "size_bytes": 8493466, "md5": "..." }
    ]
  }
]

search_books — 搜索书籍

按书名、作者或关键词搜索，每页返回 5 条结果，支持翻页。

参数：

• query（必填）— 书名、作者或关键词

• page（可选，默认 1）— 显示页码，每页 5 条

• extensions（可选）— 按格式过滤，如 ["epub", "mobi", "pdf"]

返回字段说明：

• books — 当前页书籍列表，含书名、作者、出版社、年份、语言、格式、大小、size_bytes（字节数）、MD5

• totalCount — 总结果数（单页时精确，多页时为估算值）

• totalDisplayPages — 总显示页数

• hasMore / hasPrev — 是否有下一页 / 上一页

download_book — 下载书籍

通过 MD5 下载书籍，自动按顺序尝试多个镜像：libgen.li → libgen.rs → libgen.st → library.lol。

参数：

• md5（必填）— 搜索结果中的 MD5

• title（可选）— 书名，用于文件命名

返回： 本地文件路径、文件名、字节大小、格式。

安装方式

Claude Code / Claude Desktop

在 settings.json 中添加：

{
  "mcpServers": {
    "find-a-book": {
      "command": "npx",
      "args": ["-y", "github:Xiaochengzi2048/find-a-book-mcp"]
    }
  }
}

手动安装

git clone https://github.com/Xiaochengzi2048/find-a-book-mcp
cd find-a-book-mcp
npm install
node server.js

工作原理

1. 搜索 — 抓取 LibGen 页面，无需账号或 API Key；自动尝试 libgen.li → libgen.rs → libgen.st

2. 分页 — LibGen 每次返回 25 条，本服务每显示页展示 5 条，通过 hasMore/hasPrev 驱动翻页

3. 下载 — 两步流程：从 ads.php 获取一次性 key，再通过 get.php 下载；所有镜像失败后自动切换到 library.lol

4. 保存 — 文件存入 /tmp/，文件名含时间戳防冲突

注意事项

• 无需账号或 API Key

• 支持 EPUB、MOBI、PDF、AZW3、FB2、DJVU 等格式

• size_bytes 字段方便调用方判断发送方式（如小文件直发，大文件给链接）

• 文件默认保存在 /tmp/，请自行移至目标位置

• 镜像失败时会写入 stderr，便于排查问题