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pg-mcp

by NeuroviaLabs
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neurovia-labs-pg-mcp

A lightweight MCP server for read-only PostgreSQL access. Maintains a persistent connection pool and exposes query tools for use with Claude Code or any MCP client.

Tools

Tool

Description

query

Run a read-only SQL query (SELECT, WITH, EXPLAIN)

list_tables

List all tables in a schema

describe_table

Show columns and types for a table

Related MCP server: PostgreSQL MCP Server

Usage

With npx (no install)

Add to your .mcp.json:

{
  "mcpServers": {
    "db": {
      "command": "npx",
      "args": ["github:NeuroviaLabs/pg-mcp"],
      "env": {
        "DATABASE_URL": "postgresql://user:pass@host:5432/dbname"
      }
    }
  }
}

Local

git clone git@github.com:NeuroviaLabs/pg-mcp.git
cd pg-mcp
npm install

Add to your .mcp.json:

{
  "mcpServers": {
    "db": {
      "command": "node",
      "args": ["db-server.js"],
      "env": {
        "DATABASE_URL": "postgresql://user:pass@host:5432/dbname"
      }
    }
  }
}

The connection URL can also be passed as a CLI argument:

node db-server.js postgresql://user:pass@host:5432/dbname

Features

  • Persistent connection pool (max 5 connections)

  • Read-only enforcement (SELECT/WITH/EXPLAIN only + read-only transactions)

  • 30s query timeout

  • SSL support

License

ISC

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