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 cnfeat/top-pm-skills --skill database-schema-designgit clone --depth 1 https://github.com/cnfeat/top-pm-skillsWrote 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/cnfeat/top-pm-skills/database-schema-design)<a href="https://agentmods.dev/skills/cnfeat/top-pm-skills/database-schema-design"><img src="https://agentmods.dev/badge/skills/cnfeat/top-pm-skills/database-schema-design/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/cnfeat/top-pm-skills/database-schema-design"><img src="https://agentmods.dev/badge/skills/cnfeat/top-pm-skills/database-schema-design.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 | $0.00090 | $0.03754 |
| Opus 5 | $0.00045 | $0.01877 |
| Sonnet 5 | $0.00018 | $0.00751 |
| Haiku 4.5 | $0.00009 | $0.00375 |
Grade A, and why
database-schema-design 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 5d 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 — 365 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Database Schema Design Skill
Produce a complete database schema design document for a given domain. A schema document is not just a list of tables — it is a record of decisions: what was modelled, how entities relate, which queries the schema is optimised for, and what trade-offs were made.
A good schema design document lets an engineer understand the data model, query it correctly, extend it safely, and write migrations without breaking things.
Required Inputs
Ask for these if not already provided:
- Domain description — what the system does; what business objects are being modelled
- Entities and relationships — the main things in the domain and how they relate (e.g. "a User has many Orders; an Order has many OrderItems; an OrderItem references a Product")
- Expected query patterns — the most important read and write queries (e.g. "fetch all orders for a user, sorted by date"; "look up a product by SKU")
- Database engine — PostgreSQL, MySQL, SQLite, CockroachDB, etc. — this affects DDL syntax and available types
- Expected data volume — approximate row counts, growth rate, and any partitioning needs
- Constraints — any existing conventions, naming standards, or migration constraints to respect
Output Format
Database Schema Design: [Domain / Service Name]
Service: [Name] | Team: [Team name] Author: [Name] | Reviewed by: [Name] Date: [Date] | Database engine: [PostgreSQL X.X / MySQL X.X / etc.] Status: [Draft / Reviewed / Approved]
1. Overview
[2–3 sentences describing the domain being modelled, the scope of this schema, and any key design philosophy (e.g. "this schema prioritises read performance for the customer-facing API over write simplicity", or "designed for eventual migration to multi-tenancy")]
In scope:
- [Entity or subsystem]
- [Entity or subsystem]
Out of scope:
- [e.g. Analytics / reporting tables — separate schema]
- [e.g. Audit log tables — covered in separate design doc]
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.
- 5d ago First seen · 365 lines · 90 tokens per session scan A 64ddeb8462b9
database-schema-design is a skill published in the GitHub repository cnfeat/top-pm-skills (48 stars, last pushed 2mo ago), licensed MIT. It adds 90 tokens to every session and 3,754 once invoked, about $0.0005 per session on Opus 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 2026-09-03.
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