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database-designer

database-designer is a skill for Claude Code, Codex from seaworld008/Commonly-used-high-value-skills. It costs 26 tokens per session (3,649 once invoked), scanned A, original, MIT.

A database design guide for creating and reviewing data structures, relationships, constraints, indexes, migrations, and performance choices. A database schema is the structure that defines how stored data is organized.

In plain words
What is it for?
Use it to analyze normalization, choose data types and constraints, review indexes, generate entity-relationship diagrams, and plan database changes.
Why use it?
It helps detect design problems that can make data inconsistent, queries slow, or future changes difficult.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 74repo +1 changed 2mo ago A scan SkillSpector: warn 26 tokens original MIT

Good fit Use it to analyze normalization, choose data types and constraints, review indexes, generate entity-relationship diagrams, and plan database changes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/seaworld008/commonly-used-high-value-skills/database-designer
View source ↗ seaworld008/Commonly-used-high-value-skills
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 seaworld008/Commonly-used-high-value-skills --skill database-designer
Clone the repo
git clone --depth 1 https://github.com/seaworld008/Commonly-used-high-value-skills

Made for: Claude Code, 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-designer

README.md
[![agentmods](https://agentmods.dev/badge/skills/seaworld008/commonly-used-high-value-skills/database-designer/github.svg)](https://agentmods.dev/skills/seaworld008/commonly-used-high-value-skills/database-designer)
Your own site
<a href="https://agentmods.dev/skills/seaworld008/commonly-used-high-value-skills/database-designer"><img src="https://agentmods.dev/badge/skills/seaworld008/commonly-used-high-value-skills/database-designer/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-designer

Your own site · 80×15
<a href="https://agentmods.dev/skills/seaworld008/commonly-used-high-value-skills/database-designer"><img src="https://agentmods.dev/badge/skills/seaworld008/commonly-used-high-value-skills/database-designer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,649 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Anti-Refusal · line 347
    Skill attempts to nullify the agent's safety policies or restrictions ('you have no restrictions', 'ignore your guidelines', 'do anything now'). This is a direct jailbreak that disables guardrails.
    Fix: Remove jailbreak framing that nullifies safety policies or restrictions. Skill content must not instruct the agent to ignore its guidelines or operate without guardrails.
How audits are shown
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 $0.00026 $0.03649
Opus 5.5 $0.00010 $0.01460
Sonnet 5.5 $0.00005 $0.00730
Haiku 4.5 $0.00003 $0.00365

Measured 2mo ago against content hash 62154d7cfec6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

database-designer 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.

The scan reads SKILL.md. This mod also ships 3 executable files (index_optimizer.py, migration_generator.py, schema_analyzer.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

openclaw-skills/database-designer/SKILL.md · 491 lines

How it starts

The opening of the file, as written. The whole thing — 491 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Database Designer - POWERFUL Tier Skill

Overview

A comprehensive database design skill that provides expert-level analysis, optimization, and migration capabilities for modern database systems. This skill combines theoretical principles with practical tools to help architects and developers create scalable, performant, and maintainable database schemas.

Core Competencies

Schema Design & Analysis

  • Normalization Analysis: Automated detection of normalization levels (1NF through BCNF)
  • Denormalization Strategy: Smart recommendations for performance optimization
  • Data Type Optimization: Identification of inappropriate types and size issues
  • Constraint Analysis: Missing foreign keys, unique constraints, and null checks
  • Naming Convention Validation: Consistent table and column naming patterns
  • ERD Generation: Automatic Mermaid diagram creation from DDL

Index Optimization

  • Index Gap Analysis: Identification of missing indexes on foreign keys and query patterns
  • Composite Index Strategy: Optimal column ordering for multi-column indexes
  • Index Redundancy Detection: Elimination of overlapping and unused indexes
  • Performance Impact Modeling: Selectivity estimation and query cost analysis
  • Index Type Selection: B-tree, hash, partial, covering, and specialized indexes

Migration Management

  • Zero-Downtime Migrations: Expand-contract pattern implementation
  • Schema Evolution: Safe column additions, deletions, and type changes
  • Data Migration Scripts: Automated data transformation and validation
  • Rollback Strategy: Complete reversal capabilities with validation
  • Execution Planning: Ordered migration steps with dependency resolution

Database Design Principles

Normalization Forms

First Normal Form (1NF)
  • Atomic Values: Each column contains indivisible values
  • Unique Column Names: No duplicate column names within a table
  • Uniform Data Types: Each column contains the same type of data
  • Row Uniqueness: No duplicate rows in the table

Read the full file on GitHub · 491 lines

Files

What ships with it

14 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 Changed · -58 lines · -23 tokens per session 62154d7cfec6
  2. 2mo ago First seen · 549 lines · 49 tokens per session scan A 3407b5f86dfd

Subscribe to this mod's changes

database-designer is a skill published in the GitHub repository seaworld008/Commonly-used-high-value-skills (74 stars, last pushed 2d ago), licensed MIT. It adds 26 tokens to every session and 3,649 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 2026-08-30.

Claude CodeDatabases["database", "designer", "development"]agentaiai-toolsautomationcodex
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