Postgres

by sanjay3290281d88df199357e3091a3be5c743a0fca9a9ae1bApache-2.0Listed Oct 9, 2026Updated Oct 9, 2026

Execute read-only SQL queries against multiple PostgreSQL databases. Use when: (1) querying PostgreSQL databases, (2) exploring database schemas/tables, (3) running SELECT queries for data analysis, (4) checking database contents. Supports multiple database connections with descriptions for intelligent auto-selection. Blocks all write operations (INSERT, UPDATE, DELETE, DROP, etc.) for safety.

Includes scriptsData & Analytics

AI-generated overview

Runs read-only SQL queries against configured PostgreSQL databases, with schema exploration and multi-database selection.

What it does: Executes safe, read-only SQL against one or more configured PostgreSQL databases through a Python script. It can list configured connections, list tables, show schema, and run SELECT, SHOW, EXPLAIN or WITH queries with a row limit. Write operations are blocked, and results are returned as readable text output.
When to use it: Use it when you need to query PostgreSQL data, explore database schemas or tables, or check database contents for analysis. It fits read-only investigation across several databases where the right connection must be chosen from descriptions.
Requirements: Python 3.8+ and the psycopg2-binary package from requirements.txt. A connections.json file with host, database, user and password credentials is needed, plus network access to the database hosts. The skill ships an executable script, scripts/query.py.

PostgreSQL Read-Only Query Skill

Execute safe, read-only queries against configured PostgreSQL databases.

Requirements

Python 3.8+
psycopg2-binary: pip install -r requirements.txt

Setup

Create connections.json in the skill directory or ~/.config/claude/postgres-connections.json.

Security: Set file permissions to 600 since it contains credentials:

json

{  "databases": [    {      "name": "production",      "description": "Main app database - users, orders, transactions",      "host": "db.example.com",      "port": 5432,      "database": "app_prod",      "user": "readonly_user",      "password": "your-password",      "sslmode": "require"    }  ]}

{  "databases": [    {      "name": "production",      "description": "Main app database - users, orders, transactions",      "host": "db.example.com",      "port": 5432,      "database": "app_prod",      "user": "readonly_user",      "password": "your-password",      "sslmode": "require"    }  ]}

Config Fields

Field	Required	Description
name	Yes	Identifier for the database (case-insensitive)
description	Yes	What data this database contains (used for auto-selection)
host	Yes	Database hostname
port	No	Port number (default: 5432)
database	Yes	Database name
user	Yes	Username
password	Yes	Password
sslmode	No	SSL mode: disable, allow, prefer (default), require, verify-ca, verify-full

Usage

List configured databases

Query a database

List tables

Show schema

Limit results

Database Selection

Match user intent to database description:

User asks about	Look for description containing
users, accounts	users, accounts, customers
orders, sales	orders, transactions, sales
analytics, metrics	analytics, metrics, reports
logs, events	logs, events, audit

If unclear, run --list and ask user which database.

Safety Features

Read-only session: Connection uses PostgreSQL readonly=True mode (primary protection)
Query validation: Only SELECT, SHOW, EXPLAIN, WITH queries allowed
Single statement: Multiple statements per query rejected
SSL support: Configurable SSL mode for encrypted connections
Query timeout: 30-second statement timeout enforced
Memory protection: Max 10,000 rows per query to prevent OOM
Column width cap: 100 char max per column for readable output
Credential sanitization: Error messages don't leak passwords

Troubleshooting

Error	Solution
Config not found	Create `connections.json` in skill directory
Authentication failed	Check username/password in config
Connection timeout	Verify host/port, check firewall/VPN
SSL error	Try `"sslmode": "disable"` for local databases
Permission warning	Run `chmod 600 connections.json`

Exit Codes

0: Success
1: Error (config missing, auth failed, invalid query, database error)

Workflow

Run --list to show available databases
Match user intent to database description
Run --tables or --schema to explore structure
Execute query with appropriate LIMIT

Source and attribution

Source:sanjay3290/ai-skillsinskills/postgresat commit281d88d

License: Apache-2.0

Content belongs to its original authors. SourceWeft indexes it from a public repository.

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Postgres

PostgreSQL Read-Only Query Skill

Requirements

Setup

Config Fields

Usage

List configured databases

Query a database

List tables

Show schema

Limit results

Database Selection

Safety Features

Troubleshooting

Exit Codes

Workflow

Source and attribution

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