PostgreSQL MCP Server

What is PostgreSQL MCP Server?

PostgreSQL MCP Server is a Go-based MCP (Model Context Protocol) server that lets AI assistants interact with PostgreSQL databases through a standardized interface. It provides three main capabilities: executing SELECT queries, managing database schema with DDL, and modifying data with INSERT/UPDATE/DELETE — all with built-in security validation to prevent dangerous operations.

How to use PostgreSQL MCP Server?

Install by building the Go binary from source (requires Go 1.19+). Update the database connection string in main.go or use environment variables for credentials. Run the binary as a stdio transport server. Connect any MCP client (e.g., Claude Desktop) by adding the server to its configuration file, specifying the path to the binary. Use the three tools — execute_query, ddl_query, modify_query — for respective operations.

Key features of PostgreSQL MCP Server

• Three validated SQL tools: query, DDL, and modify.
• Blocks dangerous commands like TRUNCATE and GRANT.
• Uses GORM for input sanitization and SQL injection protection.
• Supports SSL for database connection security.
• Compatible with all MCP clients using stdio transport.

Use cases of PostgreSQL MCP Server

• Let an AI assistant answer business intelligence queries from a PostgreSQL database.
• Enable AI to create and modify database tables for schema management.
• Allow AI to insert, update, or delete records with validation.
• Give AI read-only access to user analytics or inventory data.

FAQ from PostgreSQL MCP Server

How do I install the PostgreSQL MCP Server?

Create a Go project, add dependencies (mcp-golang, gorm, Postgres driver), copy the server code into main.go, update the connection string, then build and run the binary.

What types of database operations are supported?

Three operations: execute_query for SELECT queries, ddl_query for CREATE/ALTER/DROP statements, and modify_query for INSERT/UPDATE/DELETE commands.

How does PostgreSQL MCP Server ensure security?

Every query is validated before execution; only specific SQL types are allowed per tool. Commands like TRUNCATE and GRANT are blocked. All queries are sanitized through GORM's SQL injection protections.

How do I configure the database connection?

Set the connection string in the dbConn constant (e.g., host=localhost user=postgres password=yourpassword dbname=yourdb port=5432 sslmode=require) or read it from environment variables.

How do I connect PostgreSQL MCP Server to an MCP client like Claude Desktop?

Add an entry to the client’s configuration file (e.g., claude_desktop_config.json) with the command set to the path of the built binary. The server communicates over stdio.