A command-line guide for safely accessing MySQL, PostgreSQL, SQLite, and Redis databases. It requires checking the database structure before querying unfamiliar data.

Use it to inspect database tables and columns, run verified queries, and manage data through the appropriate database command-line client.

It helps prevent mistakes caused by guessing table or column names and by querying a database without understanding its schema.

database — Skill for Claude Code by husniadil/ekstend

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add husniadil/ekstend --skill database

Clone the repo

git clone --depth 1 https://github.com/husniadil/ekstend

Made for: Claude Code.

Or install database, the plugin that ships this one along with the rest of its 1 skill.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/husniadil/ekstend/database/github.svg)](https://agentmods.dev/skills/husniadil/ekstend/database)

Your own site

<a href="https://agentmods.dev/skills/husniadil/ekstend/database"><img src="https://agentmods.dev/badge/skills/husniadil/ekstend/database/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/husniadil/ekstend/database"><img src="https://agentmods.dev/badge/skills/husniadil/ekstend/database.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,910 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00026	$0.02910
Opus 5.5	$0.00010	$0.01164
Sonnet 5.5	$0.00005	$0.00582
Haiku 4.5	$0.00003	$0.00291

Measured 2mo ago against content hash 3588afb26179, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

database scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

plugins/database/skills/database/SKILL.md · 322 lines

How it starts

The opening of the file, as written. The whole thing — 322 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Database CLI

Access and manage MySQL, PostgreSQL, SQLite databases, and Redis key-value stores using their respective command-line clients.

Critical Rules

NEVER do the following:

NEVER guess or assume table names - always list tables first with SHOW TABLES, \dt, or .tables
NEVER guess or assume column names - always describe the table first with DESCRIBE, \d, or PRAGMA table_info
NEVER run SELECT queries on an unfamiliar database without exploring the schema first
NEVER assume ORM naming conventions (e.g., Order vs orders, userId vs user_id) - verify with schema

ALWAYS follow the Query Workflow below when querying data the user asks for.

Database Type Detection

Determine the database type from context:

Signal	Database Type
User says "MySQL", "mysql"	MySQL
User says "PostgreSQL", "Postgres", "psql"	PostgreSQL
User says "SQLite", "sqlite3"	SQLite
File path ends in `.db`, `.sqlite`, `.sqlite3`	SQLite
Connection string starts with `mysql://`	MySQL
Connection string starts with `postgresql://`	PostgreSQL
Connection string starts with `postgres://`	PostgreSQL
Connection string starts with `sqlite:///`	SQLite
Config has `MYSQL_*` variables	MySQL
Config has `PG` or `POSTGRES_` variables	PostgreSQL
Config has `SQLITE_*` or `DATABASE_PATH`	SQLite
User says "Redis", "redis-cli"	Redis
Connection string starts with `redis://`	Redis
Connection string starts with `rediss://`	Redis
Config has `REDIS_*` variables	Redis
Port 3306 mentioned	MySQL
Port 5432 mentioned	PostgreSQL
Port 6379 mentioned	Redis

Read the full file on GitHub · 322 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 322 lines · 26 tokens per session scan B 3588afb26179

Subscribe to this mod's changes

database is a skill published in the GitHub repository husniadil/ekstend (1 stars, last pushed 7d ago), licensed MIT. It adds 26 tokens to every session and 2,910 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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