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schema-design SKILL.md skillA

schema-design from nahid-sparktales/agent-dispatcher is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add nahid-sparktales/agent-dispatcher/schema-design@git:20260919.a0d4f55

Pins git:20260919.a0d4f55 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: nahid-sparktales/agent-dispatcher
Path: skills/database/schema-design/SKILL.md
Versions recorded: 1
Latest version: git:20260919.a0d4f55, committed Sep 19, 2026
Size: 7,357 bytes
Repository stars: 58
License: MIT

Turn what a system must guarantee into tables, keys and constraints — normalization judgement, nullability, foreign key behaviour, and naming that survives. Use when designing new tables, reviewing ORM models or a migration's DDL, or when a bug reduces to "the database allowed a row that should be impossible". Not for tuning a slow query, not for engine-specific syntax and features, and not for writing or running the migration that ships the change.

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

# Schema design

The schema is the last place a rule is still enforced. Application code, a background job, a psql
session and next year's import script all write to the same tables; only the constraints apply to
all of them.

## When this fires

Designing new tables, adding columns to existing ones, reviewing ORM models or DDL in a migration,
or when a defect traces back to the data model permitting an impossible state. It does not fire
for a query that is merely slow — that is a plan problem, not a modelling one.

## Procedure

1. **Read the existing schema before proposing anything.** Get the real DDL, constraints and
   indexes for the tables involved — `\d+` in psql, `information_schema`, or the migration files
   if that is all the access you have. Note the conventions already in use: plural or singular
   table names, key style, timestamp columns. You are joining a schema, not starting one.
2. **Write each invariant as one sentence.** "An order belongs to exactly one customer." "A
   subscription has at most one active period at a time." "An email identifies at most one
   account." Derive these from behaviour and from what breaks when they are violated, not from the
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add nahid-sparktales/agent-dispatcher/schema-design@sha256:0dd675a6e2f031ba

The line at the top of this page pins the label git:20260919.a0d4f55, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_lkpwrhdoigrrhfpo.svg)](https://markdownregistry.com/a/art_lkpwrhdoigrrhfpo)

6 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Sep 19, 2026.

version	committed	commit	size	audit
git:20260919.a0d4f55 latest	2026-09-19	a0d4f55	7,357 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (7357 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

GitHub

nahid-sparktales/agent-dispatcher · 58 stars · license MIT · pushed 2026-10-24 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_lkpwrhdoigrrhfpo
GET https://markdownregistry.com/api/v1/resolve?ref=nahid-sparktales/agent-dispatcher/schema-design
GET https://markdownregistry.com/api/v1/blob/0dd675a6e2f031ba8fd943040eb547a8ff3f4c2399a79da17803d86fdd558fbb

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.

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