Claude Database Tools MCP Server

claude-database-tools

SQL Server CLI and MCP server for Claude Code.

Why This Tool?

This project is an alternative to Microsoft's official mssql MCP server with some key advantages:

• SQL Server Authentication: Supports SQL Server authentication (username/password), not just Windows/Entra authentication. Ideal for development environments, Docker containers, or scenarios where integrated auth isn't available.

• CLI-First Design: The CLI tools can be used directly from a Claude Code skill, giving you database access without requiring MCP server setup. This is useful when you want simpler configuration or need to work in environments where MCP servers are problematic.

• MCP Server Included: Also provides an MCP server if you prefer that integration approach.

Features

• CLI Tool: Command-line interface for SQL Server operations
• MCP Server: Model Context Protocol server for Claude integration (experimental)
• Security: Built-in SQL injection prevention and query validation
• Operations: List tables, describe schemas, query data, insert/update/delete records, DDL generation

Installation

git clone https://github.com/cyronius/claude-database-tools.git
cd claude-database-tools
npm install
npm run build

Configuration

Copy .env.example to .env and configure your database connection:

cp .env.example .env

Edit .env with your SQL Server credentials:

SQL_SERVER=localhost
SQL_DATABASE=your_database
SQL_USER=your_username
SQL_PASSWORD=your_password
SQL_PORT=1433
SQL_ENCRYPT=false
SQL_TRUST_SERVER_CERTIFICATE=true

CLI Usage

After building, run commands with:

node dist/cli/index.js <command> [options]

Or install globally:

npm install -g .
sql-cli <command> [options]

Commands

Examples

# List all tables
sql-cli list-tables

# List tables in specific schemas
sql-cli list-tables dbo sales

# Describe a table
sql-cli describe-table dbo.Users

# Query data
sql-cli read-data "SELECT TOP 10 * FROM dbo.Users"

# Insert data
sql-cli insert-data dbo.Users '{"name": "John", "email": "john@example.com"}'

# Update data
sql-cli update-data dbo.Users '{"name": "Jane"}' "id = 1"

# Delete data (requires --confirm flag)
sql-cli delete-data dbo.Users "id = 1" --confirm

# Get table DDL
sql-cli get-ddl dbo.Users

MCP Server (Experimental)

Note: The MCP server integration has not been fully tested. Use at your own risk.

The MCP server allows Claude Code to interact with your SQL Server database directly.

Setup

Add to your ~/.claude/mcp.json:

{
  "mcpServers": {
    "mssql": {
      "command": "node",
      "args": ["/path/to/claude-database-tools/dist/index.js"],
      "env": {
        "SQL_SERVER": "your-server",
        "SQL_DATABASE": "your-database",
        "SQL_USER": "your-username",
        "SQL_PASSWORD": "your-password",
        "SQL_ENCRYPT": "true",
        "READONLY": "true"
      }
    }
  }
}

Restart Claude Code to load the MCP server.

Available MCP Tools

Read-Only (available when READONLY=true):

• list_tables - List tables
• describe_table - Get table schema
• read_data - Execute SELECT queries
• get_table_ddl - Generate CREATE TABLE DDL
• get_table_alter_ddl - Generate ALTER TABLE DDL

Write (requires READONLY=false):

• insert_data - Insert records
• update_data - Update records
• delete_data - Delete records
• create_table - Create tables
• create_index - Create indexes
• drop_table - Drop tables
• execute_stored_proc - Execute stored procedures

Security

• SQL Injection Prevention: SELECT queries are validated against dangerous keywords and patterns
• Parameterized Queries: All INSERT/UPDATE/DELETE operations use parameterized queries
• WHERE Clause Required: UPDATE and DELETE operations require WHERE clauses
• Query Limits: Maximum query length of 10,000 characters, result sets limited to 10,000 records
• Read-Only Mode: Set READONLY=true to disable write operations