MCP Open Library

A Model Context Protocol (MCP) server for the Open Library API that enables AI assistants to search for book information.

Overview

This project implements an MCP server that provides a tool for AI assistants to search the Open Library for book information by title. The server returns structured data about the most relevant book match, including title, authors, publication year, and other metadata.

Features

• Book Search by Title: Search for books using their title and get detailed information
• Structured Response Format: Returns book information in a consistent JSON structure
• Error Handling: Proper validation and error reporting
• Testing: Comprehensive test coverage with Vitest

Installation

# Clone the repository
git clone https://github.com/your-username/mcp-open-library.git
cd mcp-open-library

# Install dependencies
npm install

# Build the project
npm run build

Usage

Running the Server

You can use the MCP Inspector to test the server:

npm run inspector

Access the MCP Inspector and then test the tool e.g.

Using with an MCP Client

This server implements the Model Context Protocol, which means it can be used by any MCP-compatible AI assistant or client e.g. Claude Desktop. The server exposes the following tool:

• get_book_by_title: Search for book information by title

Example input:

{
  "title": "The Hobbit"
}

Example output:

{
  "title": "The Hobbit",
  "authors": ["J.R.R. Tolkien"],
  "first_publish_year": 1937,
  "open_library_work_key": "/works/OL45883W",
  "edition_count": 120
}

An example of this tool being used in Claude Desktop can be see here:

<img width="1132" alt="image" src="https://github.com/user-attachments/assets/0865904a-f984-4f7b-a27d-6397ac59d6d2" />

Development

Project Structure

• src/index.ts - Main server implementation
• src/types.ts - TypeScript type definitions
• src/index.test.ts - Test suite

Available Scripts

• npm run build - Build the TypeScript code
• npm run watch - Watch for changes and rebuild
• npm test - Run the test suite
• npm run format - Format code with Prettier
• npm run inspector - Run the MCP Inspector against the server

Running Tests

npm test

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Acknowledgments

• Open Library API
• Model Context Protocol