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database-architect

database-architect is a skill for Codex from lsantosweb/codex-agents-skills-kit. It costs 24 tokens per session (286 once invoked), scanned A, original, MIT.

A database design and review guide for data structures, changes to those structures, SQL queries, indexes, and database platform choices.

In plain words
What is it for?
Use it when designing schemas, planning reversible migrations, reviewing SQL, improving query speed, or choosing among PostgreSQL, SQLite, Supabase, Neon, Turso, and pgvector.
Why use it?
It helps catch broken data relationships, unsafe changes, and indexes that do not match the queries an application actually runs.

Skill for Codex

Written for Codex: installed under .codex/.

not rated 2repo 7mo ago A scan 24 tokens original MIT

Good fit Use it when designing schemas, planning reversible migrations, reviewing SQL, improving query speed, or choosing among PostgreSQL, SQLite, Supabase, Neon, Turso, and pgvector.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/lsantosweb/codex-agents-skills-kit/database-architect
View source ↗ lsantosweb/codex-agents-skills-kit
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.

Any agent
npx skills add lsantosweb/codex-agents-skills-kit --skill database-architect
Clone the repo
git clone --depth 1 https://github.com/lsantosweb/codex-agents-skills-kit

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 database-architect

README.md
[![agentmods](https://agentmods.dev/badge/skills/lsantosweb/codex-agents-skills-kit/database-architect/github.svg)](https://agentmods.dev/skills/lsantosweb/codex-agents-skills-kit/database-architect)
Your own site
<a href="https://agentmods.dev/skills/lsantosweb/codex-agents-skills-kit/database-architect"><img src="https://agentmods.dev/badge/skills/lsantosweb/codex-agents-skills-kit/database-architect/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 database-architect

Your own site · 80×15
<a href="https://agentmods.dev/skills/lsantosweb/codex-agents-skills-kit/database-architect"><img src="https://agentmods.dev/badge/skills/lsantosweb/codex-agents-skills-kit/database-architect.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 286 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 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 $0.00024 $0.00286
Opus 5.5 $0.00010 $0.00114
Sonnet 5.5 $0.00005 $0.00057
Haiku 4.5 $0.00002 $0.00029

Measured 2mo ago against content hash cd41b163fed4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

database-architect scanned grade A with 0 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 2mo 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.codex/skills/database-architect/SKILL.md · 49 lines

What it actually says

When to use

Use this skill for:

  • schema changes
  • migrations
  • SQL review
  • index strategy
  • query performance
  • normalization and data modeling
  • PostgreSQL, SQLite, Supabase, Neon, Turso, pgvector

Core operating rules

  • Start from entities, relationships, query patterns, and scale.
  • Design indexes from actual access patterns.
  • Use constraints to protect integrity.
  • Measure query performance before optimizing.
  • Prefer reversible, low-risk migrations.

Decision guidance

  • Full relational features: PostgreSQL/Neon.
  • Edge/local simplicity: SQLite/Turso.
  • Vector/AI retrieval: PostgreSQL + pgvector.
  • Edge ORM: Drizzle.
  • Schema-first DX: Prisma.

Execution workflow

  1. Restate entity and query requirements.
  2. Propose schema or migration approach.
  3. Define keys, constraints, and indexes.
  4. Review common query paths.
  5. Provide rollback or safety plan.

Mandatory checks

  • Primary and foreign keys are defined appropriately.
  • Constraints reflect business rules.
  • No SELECT * in performance-sensitive code.
  • Indexes map to real queries.
  • Migration path is reversible or explicitly documented as not reversible.
  • Query plan review is included when optimizing.
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. 2mo ago First seen · 49 lines · 24 tokens per session scan A cd41b163fed4

Subscribe to this mod's changes

database-architect is a skill published in the GitHub repository lsantosweb/codex-agents-skills-kit (2 stars, last pushed 7mo ago), licensed MIT. It adds 24 tokens to every session and 286 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Databases
Related

database-architect compared with skills from other repositories

database-architect next to 6 skills from other repositories
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database-architectlsantosweb/codex-agents-skills-kitSkill27mo agoMITA24Codex
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