IBM DB2 for i MCP server

mcp-server-db2i

A Model Context Protocol (MCP) server for IBM DB2 for i (DB2i). This server enables AI assistants like Claude and Cursor to query and inspect IBM i databases using the JT400 JDBC driver.

Listed in the MCP Registry as io.github.Strom-Capital/mcp-server-db2i.

Architecture

AI clients connect to the MCP Server via stdio (IDEs) or HTTP (agents), which executes read-only queries against DB2 for i using the JT400 JDBC driver.

graph LR
    subgraph clients ["AI Clients"]
        claude("Claude")
        cursor("Cursor IDE")
        agents("Custom Agents")
    end

    subgraph server ["MCP Server"]
        stdio["stdio"]
        http["HTTP + Auth"]
        tools[["MCP Tools"]]
        jdbc["JT400 JDBC"]
    end

    subgraph ibmi ["IBM i"]
        db2[("DB2 for i")]
    end

    claude & cursor -->|MCP Protocol| stdio
    agents -->|REST API| http
    stdio & http --> tools
    tools --> jdbc
    jdbc -->|JDBC| db2

Features

• Read-only SQL queries - Execute SELECT statements safely with automatic result limiting
• Schema inspection - List all schemas/libraries with optional filtering
• Table metadata - List tables, describe columns, view indexes and constraints
• View inspection - List and explore database views
• Secure by design - Only SELECT queries allowed, credentials via environment variables
• Docker support - Run as a container for easy deployment
• HTTP Transport - REST API with token authentication for web/agent integration
• Current MCP spec - Speaks 2026-07-28 and still serves stateless 2025-era clients
• Dual Transport - Run stdio and HTTP simultaneously
• Tool selection - Enable or disable individual tools, e.g. a metadata-only mode without execute_query
• Business SQL tools - Load read-only ERP queries and table notes from YAML. See Business SQL tools
• Compact responses - Compact JSON by default, or markdown tables to save tokens

Quick Start

Installation

npm install -g mcp-server-db2i

Or with Docker:

docker build -t mcp-server-db2i .

Configuration

Create a .env file with your IBM i credentials:

DB2I_HOSTNAME=your-ibm-i-host.com
DB2I_USERNAME=your-username
DB2I_PASSWORD=your-password
DB2I_SCHEMA=your-default-schema  # Optional

Shortened. The full README is on GitHub.