read-only-postgres

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

1installs

Sourcejawwadfirdousi/agent-skills

Added on2026-02-20

NPX Install

npx skill4agent add jawwadfirdousi/agent-skills read-only-postgres

SKILL.md Content

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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/read-only-postgres-connections.json

.

Security: Set file permissions to

since it contains credentials:

bash

chmod 600 connections.json

json

{
  "databases": [
    {
      "name": "app-db-dev",
      "description": "Primary app database (public schema: users, organizations, orders, order_items, events)",
      "host": "localhost",
      "port": 5432,
      "database": "app_dev",
      "user": "app_user",
      "password": "app_password",
      "sslmode": "disable"
    },
    {
      "name": "app-db-staging",
      "description": "Staging database (same schema as primary app)",
      "host": "localhost",
      "port": 5432,
      "database": "app_staging",
      "user": "app_user",
      "password": "app_password",
      "sslmode": "disable"
    }
  ]
}

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

bash

python3 scripts/query.py --list

Query a database

bash

python3 scripts/query.py --db app-db-dev --query "SELECT id, email, created_at FROM users LIMIT 10"

List tables

bash

python3 scripts/query.py --db app-db-dev --tables

Show schema

bash

python3 scripts/query.py --db app-db-dev --schema

Limit results

bash

python3 scripts/query.py --db app-db-dev --query "SELECT id, status, total_amount FROM orders" --limit 100

Database Selection

Match user intent to database

description

:

User asks about	Look for description containing
users, accounts	users, accounts
organizations, teams	organizations, teams
orders, payments	orders, payments
events, audit logs	events, audit, logs
analytics or reporting	analytics, reporting
background jobs or queues	jobs, queue, outbox

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 (comments/literals stripped; DDL/DML keywords, data-modifying CTEs, SELECT INTO, and sequence mutation functions blocked)
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

read-only-postgres

NPX Install

Tags

SKILL.md Content

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