read-db SKILL.md skillA
read-db from toongri/oh-my-toong-playground is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add toongri/oh-my-toong-playground/read-db@git:20261006.dbc8f12Pins git:20261006.dbc8f12 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- toongri/oh-my-toong-playground
- Path
skills/read-db/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261006.dbc8f12, committed Oct 6, 2026
- First version recorded
- Sep 21, 2026
- Size
- 3,916 bytes
- Repository stars
- 25
- License
- MIT
Use when a task needs real rows, counts, or column facts from a PostgreSQL database — checking data before a migration, debugging one user's stored values, answering "how many / which / is there any" about live data — triggers include "DB 조회", "운영 데이터 확인", "prd에서 확인", "psql", "SELECT", "row count", "NULL 있는지", "query the database". Not for writes, migrations, or schema changes.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Read DB
## Overview
Every lookup goes through one wrapper, `read-db.ts`, addressed by a **named read-only service**. The wrapper owns the safety settings, so a lookup is one short command and the connection string never appears anywhere.
**Core principle:** the command names its target. `app-prd-ro` in the command line says which database was read; `"$DATABASE_URI"` says nothing and puts the password in the process list.
## The Lookup
1. **Schema from code first.** Column names, types, and nullability come from the repo's schema files (Drizzle, Django models, migrations). Query the database for data, not for structure you can read.
2. **Pick the service.** `bun ${CLAUDE_SKILL_DIR}/scripts/read-db.ts --list` prints the services available on this machine. The name states environment and access (`…-prd-ro`, `…-stg-ro`). State in your reply which one you read.
3. **Run one statement.**
```bash
bun ${CLAUDE_SKILL_DIR}/scripts/read-db.ts app-prd-ro \
"select count(*) filter (where supplement_code is null) as nulls, count(*) as total from bottles"
```
…Read the whole file at its exact version.
How to install
mdr add toongri/oh-my-toong-playground/read-db@sha256:392576e472f7e30dThe line at the top of this page pins the label git:20261006.dbc8f12, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ssyocewhbfww4nwm)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Sep 21, 2026 and Oct 6, 2026, about one every 15 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261006.dbc8f12 latest | 2026-10-06 | dbc8f12 | 3,916 B | A | view · diff |
| git:20260921.a835df7 | 2026-09-21 | a835df7 | 3,326 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3916 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
toongri/oh-my-toong-playground · 25 stars · license MIT · pushed 2026-10-22 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ssyocewhbfww4nwm GET https://markdownregistry.com/api/v1/resolve?ref=toongri/oh-my-toong-playground/read-db GET https://markdownregistry.com/api/v1/blob/392576e472f7e30d600a0e1d77475129857b15ae0d5a139bcb47ab10f3516c81
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.