MCP PostgreSQL Explorer
Enables AI clients to explore a PostgreSQL database schema and run read-only queries, including listing tables, describing columns, executing SELECT queries, and retrieving foreign key relationships.
README
MCP PostgreSQL Explorer
MCP PostgreSQL Explorer is a TypeScript MCP server that lets AI clients explore a PostgreSQL database schema and run read-only queries.
This is my first project of this kind. I am a computer science student building it to learn how MCP servers, TypeScript, PostgreSQL introspection, and database tooling work together.
Features
- Lists base tables in a PostgreSQL schema.
- Describes table columns, data types, defaults, nullability, and constraints.
- Runs
SELECT-only queries. - Lists foreign key relationships between tables.
- Uses
publicas the default schema, with an optional schema override.
Tools
list_tables
Lists base tables in a schema.
Default:
{
"schema": "public"
}
describe_table
Describes a table in a schema.
{
"schema": "public",
"table": "users"
}
execute_query
Runs a read-only PostgreSQL query.
{
"query": "SELECT * FROM users LIMIT 10",
"params": []
}
The tool rejects mutations, semicolons, and non-SELECT statements.
get_relationships
Lists foreign key relationships for tables in a schema.
{
"schema": "public"
}
Tech Stack
- TypeScript
- Node.js
@modelcontextprotocol/sdkpg- PostgreSQL system catalogs and
information_schema
Setup
Install dependencies:
npm install
Set your database connection string:
export DATABASE_URL="postgres://user:password@localhost:5432/database_name"
On Windows PowerShell:
$env:DATABASE_URL="postgres://user:password@localhost:5432/database_name"
Run
npx tsx src/index.ts
Type Check
npx tsc --noEmit
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