Ktanaka101 MCP Server Duckdb

An MCP server implementation based on DuckDB, providing the ability to interact with the database through MCP tools, supporting operations such as queries, table creation, and schema inspection, and can be configured in read-only mode to ensure data security.

Database Developer tools #Database interaction #Local analysis #Read-only mode #MCP protocol .Python

rating : 2 points

downloads : 15

update time : 2025-04-29

What is the DuckDB MCP Server?

This is a service that allows you to interact with the DuckDB database through natural language. As an intermediate layer, it converts your requests into database operations, making it particularly suitable for users unfamiliar with SQL to conduct local data analysis.

How to use the DuckDB MCP Server?

You can use this service through Claude Desktop or by direct installation. After installation, configure the database path to start querying and analyzing data.

Use cases

It is suitable for scenarios that require rapid analysis of local data, such as CSV file analysis, small dataset processing, and prototype development. It is especially suitable for data scientists and developers to conduct exploratory data analysis.

Main features

Data queryExecute SELECT queries to read data from the database, supporting various conditional filtering and aggregation operations

Data modificationExecute INSERT, UPDATE, or DELETE operations to modify the database content (can be disabled)

Table managementCreate new tables and define table structures to facilitate data organization

Schema viewingView which tables are in the database and the structure information of the tables

Advantages and limitations

Advantages

Lightweight: DuckDB is an embedded database designed for analytical workloads, consuming few resources

Ease of use: You can operate the database through natural language without being proficient in SQL

Security: It provides a read-only mode to prevent accidental data modification

Local operation: Data is processed entirely locally without the need for a network connection

Limitations

Not suitable for large-scale production environments: It is mainly used for local analysis and development

Limited functionality: Compared with a full-fledged relational database, the functionality is simplified

Concurrency limitation: DuckDB has limited concurrency capabilities during write operations

How to use

Install the service

Automatically install through Smithery or manually configure

Configure the database path

Specify the location of the DuckDB database file in the Claude Desktop configuration file

Start using

Directly enter natural language instructions in Claude to interact with the database

Usage examples

Sales data analysisAnalyze monthly sales data to find the best-selling products and sales trends

User data managementCreate a new table to store user information and query specific users

Data explorationQuickly view which tables are in the database and their structures

Frequently Asked Questions

What happens if the database file does not exist?

How to ensure data security?

Which SQL operations are supported?

Is there a limit to the database size?

Related resources

DuckDB official documentation

Complete documentation for the DuckDB database

MCP protocol specification

Technical specification for the Model Context Protocol

MCP Inspector tool

A visualization tool for debugging MCP servers

Smithery installation platform

A platform for one-click installation of MCP servers

🚀 mcp-server-duckdb

An implementation of the Model Context Protocol (MCP) server for DuckDB, enabling database interaction through MCP tools. DuckDB is well - suited for local analysis.

🚀 Quick Start

This server interacts with the DuckDB database through the Model Context Protocol (MCP), supporting operations such as executing queries, creating tables, and viewing table structures.

✨ Features

Resources

Currently, there is no custom resource implementation.

Prompts

Currently, there is no custom prompt implementation.

Tools

The server implements the following database interaction tools:

read-query: Execute a SELECT query to read data
- Input: query (string) - Must be a SELECT statement
- Output: Query result text
write-query: Execute an INSERT, UPDATE, or DELETE query to modify data
- Input: query (string) - Must be a non - SELECT statement
- Output: Query result text
create-table: Create a new table
- Input: query (string) - Must be a CREATE TABLE statement
- Output: Success confirmation message
list-tables: List all tables in the database
- Input: None
- Output: A list of tables obtained from information_schema
describe-table: Get the schema information of a specific table
- Input: table_name (string) - The name of the table to describe
- Output: Table schema information

⚠️ Important Note

When the server runs in read - only mode, the following tools are disabled to prevent any write operations:

write-query

create-table

This ensures that the Large Language Model (LLM) cannot perform any database modification operations, thus maintaining data integrity and preventing accidental changes.

🔧 Technical Details

Required Parameters

db-path (string): The path to the DuckDB database file
- The server will automatically create the database file and its parent directory if they do not exist.

Optional Parameters

--readonly: Run the server in read - only mode
- Description: When this flag is set, the server will run in read - only mode. This means:
  - The DuckDB database will be opened with read_only=True, preventing any write operations.
  - If the specified database file does not exist, it will not be created.
  - Security Advantage: It prevents the Large Language Model (LLM) from performing any write operations, ensuring that the database remains unchanged.
- Note: read_only is the correct term in DuckDB.