chatgpt-app:add-database

A guide for adding PostgreSQL to a ChatGPT app through Supabase. PostgreSQL is a database for storing app data, and Supabase provides it as an online service.

In plain words
What is it for?
Use it to set up a PostgreSQL database and connect it to a ChatGPT app.
Why use it?
It helps configure persistent storage so app data can be saved and used later.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/hollaugo/tutorials/add-database
Any agent
npx skills add hollaugo/tutorials --skill add-database
Clone the repo
git clone --depth 1 https://github.com/hollaugo/tutorials

Made for: Claude Code, Codex.

Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 409 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. Scan, not verified.
Origin unknown 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 $0.00025 $0.00409
Opus 5 $0.00013 $0.00204
Sonnet 5 $0.00005 $0.00082
Haiku 4.5 $0.00003 $0.00041

Measured yesterday against content hash b11552ad5faf, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

chatgpt-app:add-database scanned grade C 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 yesterday.

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.

Harvests environment variableshighData exfiltration

Enumerating or grepping the environment for keys collects credentials unrelated to what the mod says it does.

2. **Gather Credentials**
chatgpt-apps-plugin/skills/add-database/SKILL.md · 74 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. yesterday First seen · 74 lines · 25 tokens per session scan C b11552ad5faf

Subscribe to this mod's changes

chatgpt-app:add-database is a skill published in the GitHub repository hollaugo/tutorials (22 stars, last pushed 6mo ago), with no licence file. It adds 25 tokens to every session and 409 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it C with 1 finding (harvests environment variables). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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