netlify-database

netlify-database is a skill for Codex from PracticalSwan/agent-skills. It costs 111 tokens per session (5,300 once invoked), scanned C, original, MIT.

A managed PostgreSQL database for Netlify applications, with tools for running queries, applying schema migrations, using Drizzle ORM, and creating databases for deploy previews. PostgreSQL is a relational database used to store structured application data.

In plain words
What is it for?
Use it to store application data, write and apply database schema changes, query data from server functions, and give deploy previews separate database branches.
Why use it?
It removes much of the setup needed to provision and connect a database across local development, deployments, and preview environments.

Skill for Codex

Written for Codex: reads ~/.codex or $CODEX_HOME. Also seen: positional $N argument; mentions Claude Code; mentions Codex.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is import { db } from "../../db";.

Good fit Use it to store application data, write and apply database schema changes, query data from server functions, and give deploy previews separate database branches.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/PracticalSwan/agent-skills
agentmods
npx agentmods add skills/practicalswan/agent-skills/netlify-database

Made for: Codex.

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.

agentmods badge for netlify-database

README.md
[![agentmods](https://agentmods.dev/badge/skills/practicalswan/agent-skills/netlify-database/github.svg)](https://agentmods.dev/skills/practicalswan/agent-skills/netlify-database)
Your own site
<a href="https://agentmods.dev/skills/practicalswan/agent-skills/netlify-database"><img src="https://agentmods.dev/badge/skills/practicalswan/agent-skills/netlify-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.

agentmods 80×15 button for netlify-database

Your own site · 80×15
<a href="https://agentmods.dev/skills/practicalswan/agent-skills/netlify-database"><img src="https://agentmods.dev/badge/skills/practicalswan/agent-skills/netlify-database.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 111 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,300 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00111 $0.05300
Opus 5 $0.00056 $0.02650
Sonnet 5 $0.00022 $0.01060
Haiku 4.5 $0.00011 $0.00530

Measured 3d ago against content hash 31c67064d527, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade C, and why

netlify-database scanned grade C with 2 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 3d 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.

Hidden instructionshighPrompt injection

Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.

<!-- system: agent-context/database/system.md — human-owned, merged by ctx-gen; edit system.md, not this section -->

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

`--prod`); if a preview also fails, report and stop. Never curl
netlify-database/SKILL.md · 449 lines

How it starts

The opening of the file, as written. The whole thing — 449 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Netlify Database

Zero-config managed Postgres. Install @netlify/database, write migrations under netlify/database/migrations/, deploy — Netlify provisions the DB and applies migrations automatically. Queryable from Functions, Edge Functions, Builds, and Agent Runners.

Modern client (reach for this)

import { getDatabase } from "@netlify/database";

const db = getDatabase();               // auto-selects connection for the runtime
const userId = 42;
const users = await db.sql`SELECT * FROM users WHERE id = ${userId}`;  // auto-parameterized

Own driver / ORM instead:

import { getConnectionString } from "@netlify/database";
const connectionString = getConnectionString();  // correct branch for this env

Legacy — do NOT use for new code: import { neon } from "@netlify/neon". Superseded by @netlify/database. Replace neon() calls with the Drizzle netlify-db adapter or a Postgres driver via getConnectionString(). The legacy env var NETLIFY_DATABASE_URL is replaced by NETLIFY_DB_URL.

Where things go

What Location
Migrations netlify/database/migrations/ (SQL files or subdirs with migration.sql)
Query code Functions (netlify/functions/), Edge Functions
Drizzle schema db/schema.ts (convention)
Drizzle client db/index.ts (convention)
Connection string NETLIFY_DB_URL env var, or getConnectionString()

Querying

getDatabase(options?) returns a client with sql and pool. options.connectionString overrides the auto-provisioned one; options.debug enables logging.

const db = getDatabase();
const active = await db.sql`SELECT * FROM users WHERE active = ${true}`;
await db.sql`INSERT INTO users (name, email) VALUES (${"Ada"}, ${"[email protected]"})`;
await db.sql`UPDATE users SET name = ${"Ada Lovelace"} WHERE id = ${1}`;
await db.sql`DELETE FROM users WHERE id = ${1}`;

// Type the rows
interface User { id: number; name: string; email: string; }
const typed = await db.sql<User>`SELECT * FROM users`;

// Stream
for await (const row of db.sql`SELECT * FROM users`.stream()) { /* ... */ }
for await (const chunk of db.sql`SELECT * FROM users`.chunked(100)) { /* ... */ }

Read the full file on GitHub · 449 lines

Files

What ships with it

8 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.

  1. 3d ago Changed · -1 lines 31c67064d527
  2. 4d ago Changed 0ac7c722a556
  3. 7d ago First seen · 450 lines · 111 tokens per session scan C 0b6c0e1b2ab2

Subscribe to this mod's changes

netlify-database is a skill published in the GitHub repository PracticalSwan/agent-skills (14 stars, last pushed 3d ago), licensed MIT. It adds 111 tokens to every session and 5,300 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it C with 2 findings (hidden instructions, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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