read-db skillA
read-db is agent-read markdown (skill) from toongri/oh-my-toong-playground: 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..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns 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@git:20260921.a835df7mdr add toongri/oh-my-toong-playground/read-db@sha256:496c63f04303c704Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_ssyocewhbfww4nwm)
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Versions
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 (3326 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 2026-09-22 · 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/496c63f04303c7042d2b60f31ce2093c4982eafc332b671b218e301e928c3bd6
Your agent 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.