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Read-Only Postgres MCP Server with Guardrails

Let an AI assistant query your database safely with read-only, row-limited access.

Intermediate14h1–2 people16/20 fit
TL;DR

Build Read-Only Postgres MCP Server with Guardrails for developers and data teams in ~14h with 1–2 people. Stack: MCP SDK + Postgres + Node.js.

Why it wins: Security-aware agent tooling stands out.

Build flow

01 · Problem
Giving assistants database access is useful but one bad query can leak or delete data.
02 · Solution
Expose schema and query tools over MCP using a read-only role, statement timeouts, row limits and a column deny-list for sensitive fields.
03 · Build
  1. 1Create a read-only Postgres role
  2. 2Implement MCP tools
  3. 3Add limits and deny-list checks
  4. 4Log every query
04 · Demo
Ask the assistant a business question and show a blocked query for a sensitive column.

MVP checklist

  • Schema tool
  • Read-only query tool
  • Sensitive column blocking
  • Query audit log

Tech stack

TechRole
MCP SDKModel Context Protocol tools
PostgresRelational database
Node.jsBackend runtime

Reference repos

Open-source projects you can build on. Links checked 2026-10-31.

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