A database query helper for listing schemas and tables, checking a table's columns, or running SQL. It works with databases such as PostgreSQL, MySQL, SQLite, and MongoDB.

Use it to find database objects, understand table structure, count or retrieve records, and investigate project data. It also helps locate the correct SQLite database file from project configuration.

It lets an agent inspect stored data without opening an interactive database session. It also adds safeguards against destructive SQL and exposing credentials.

db — Skill for Claude Code by brain-bootstrap

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 brain-bootstrap/claude-code-brain-bootstrap --skill db

Clone the repo

git clone --depth 1 https://github.com/brain-bootstrap/claude-code-brain-bootstrap

Made for: Claude Code.

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/brain-bootstrap/claude-code-brain-bootstrap/db/github.svg)](https://agentmods.dev/skills/brain-bootstrap/claude-code-brain-bootstrap/db)

Your own site

<a href="https://agentmods.dev/skills/brain-bootstrap/claude-code-brain-bootstrap/db"><img src="https://agentmods.dev/badge/skills/brain-bootstrap/claude-code-brain-bootstrap/db/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/brain-bootstrap/claude-code-brain-bootstrap/db"><img src="https://agentmods.dev/badge/skills/brain-bootstrap/claude-code-brain-bootstrap/db.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 327 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. 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	$0.00035	$0.00327
Opus 5.5	$0.00014	$0.00131
Sonnet 5.5	$0.00007	$0.00065
Haiku 4.5	$0.00003	$0.00033

Measured 1mo ago against content hash 07958d6ef1f7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

db scanned grade A with 0 findings 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 1mo 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/db/SKILL.md · 41 lines

What it actually says

DB Skill

Query the database in non-interactive mode.

Usage

/db schemas              # List available schemas
/db tables               # List all tables
/db describe users       # Describe the users table
/db SELECT COUNT(*) FROM orders  # Run raw SQL

Instructions

Determine action from $ARGUMENTS:

Argument	Action
`schemas`	`{{DB_LIST_SCHEMAS_CMD}}`
`tables`	`{{DB_LIST_TABLES_CMD}}`
`describe <table>`	`{{DB_DESCRIBE_CMD}} <table>`
`<raw-sql>`	`{{DB_QUERY_CMD}} "<sql>"`

⚠️ Always use non-interactive mode:

PostgreSQL: psql -c "SQL" | cat
MySQL: mysql -e "SQL" | cat
SQLite: sqlite3 db.sqlite "SQL"
MongoDB: mongosh --eval "db.collection.find()" --quiet

Rules:

Read claude/build.md for the DB connection string and credentials
NEVER run destructive SQL (DROP, TRUNCATE, DELETE without WHERE) without explicit user confirmation
NEVER commit credentials — always use env var references
For $DB_PATH (SQLite): check project config files for the actual path

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.

1mo ago First seen · 41 lines · 35 tokens per session scan A 07958d6ef1f7

Subscribe to this mod's changes

db is a skill published in the GitHub repository brain-bootstrap/claude-code-brain-bootstrap (11 stars, last pushed 5mo ago), licensed MIT. It adds 35 tokens to every session and 327 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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