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.
npx skills add shining319/claude-code-single-person-workflow --skill database-designergit clone --depth 1 https://github.com/shining319/claude-code-single-person-workflowWrote 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.
[](https://agentmods.dev/skills/shining319/claude-code-single-person-workflow/database-designer)<a href="https://agentmods.dev/skills/shining319/claude-code-single-person-workflow/database-designer"><img src="https://agentmods.dev/badge/skills/shining319/claude-code-single-person-workflow/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.
<a href="https://agentmods.dev/skills/shining319/claude-code-single-person-workflow/database-designer"><img src="https://agentmods.dev/badge/skills/shining319/claude-code-single-person-workflow/database-designer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00112 | $0.03577 |
| Opus 5.5 | $0.00045 | $0.01431 |
| Sonnet 5.5 | $0.00022 | $0.00715 |
| Haiku 4.5 | $0.00011 | $0.00358 |
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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 457 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Database Designer
Design complete, production-ready database schemas based on user requirements. Generate comprehensive documentation, SQL scripts, and visual ER diagram files compatible with DrawDB.
Core Design Principles
Before starting any design, always read references/design-principles.md to understand:
- No physical foreign keys (logical relationships only)
- Realistic field sizes based on actual usage
- Minimal, strategic index design
- Mandatory comments on all tables and fields
- Default system fields (id, timestamps, soft delete)
- snake_case naming conventions
Workflow
Step 1: Understand Requirements
Gather information about the database design:
- Database type: MySQL 8.0 (default), PostgreSQL, SQL Server, etc.
- Business domain: E-commerce, blog, CRM, ERP, etc.
- Core entities: What are the main tables needed?
- Key features: What functionality should the database support?
- Special requirements: Any specific constraints or preferences?
If the user provides minimal information, intelligently infer missing details based on common business scenarios and best practices documented in references/design-examples.md.
Key inference scenarios:
- User says "design a user table" → Infer: username, password, email, phone, status
- User says "e-commerce system" → Infer: user, product, order, order_detail tables
- User says "blog system" → Infer: user, article, comment, tag, article_tag tables
Step 2: Load Reference Documentation
Based on the design requirements, load appropriate references:
- Always load:
references/design-principles.mdfor core design rules - For format generation:
references/drawdb-formats.mdfor JSON/DBML specifications - For examples:
references/design-examples.mdfor similar system designs
Step 3: Design Database Schema
Create complete table structures following these guidelines:
Table Design Checklist
For each table:
- ✅ Add default system fields (unless user specifies otherwise):
idBIGINT AUTO_INCREMENT PRIMARY KEYcreated_atDATETIME DEFAULT CURRENT_TIMESTAMPupdated_atDATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMPis_deletedTINYINT(1) DEFAULT 0
What ships with it
5 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.
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.
- 1mo ago First seen · 457 lines · 112 tokens per session scan A d729c6ff6f99
database-designer is a skill published in the GitHub repository shining319/claude-code-single-person-workflow (21 stars, last pushed 26d ago), licensed MIT. It adds 112 tokens to every session and 3,577 once invoked, about $0.0004 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.
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