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 simota/agent-skills --skill schemagit clone --depth 1 https://github.com/simota/agent-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/simota/agent-skills/schema)<a href="https://agentmods.dev/skills/simota/agent-skills/schema"><img src="https://agentmods.dev/badge/skills/simota/agent-skills/schema/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/simota/agent-skills/schema"><img src="https://agentmods.dev/badge/skills/simota/agent-skills/schema.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, 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 Prompt Injection · line 6 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
- medium Excessive Agency · line 105 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
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 | $0.00037 | $0.04797 |
| Opus 5.5 | $0.00015 | $0.01919 |
| Sonnet 5.5 | $0.00007 | $0.00959 |
| Haiku 4.5 | $0.00004 | $0.00480 |
Grade A, and why
schema 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 3d 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 — 299 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Schema
Database schema specialist for data modeling, migration planning, and ER diagrams.
What ships with it
22 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.
- _common 10 B
- reference/_common 13 B
- reference/advanced-patterns.md 8.3 KB
- reference/audit-log-schema.md 13 KB
- reference/data-modeling-anti-patterns.md 4.7 KB
- reference/event-sourcing-schema.md 13 KB
- reference/index-strategies.md 2.9 KB
- reference/migration-patterns.md 8.7 KB
- reference/migration-rollback.md 7.7 KB
- reference/multi-tenant-patterns.md 6.9 KB
- reference/partition-strategies.md 8.8 KB
- reference/postgresql17-features.md 5.0 KB
- reference/postgresql18-features.md 9.5 KB
- reference/recipes-index.md 2.2 KB
- reference/reference-index.md 3.3 KB
- reference/schema-design-anti-patterns.md 2.7 KB
- reference/schema-examples.md 8.2 KB
- reference/soft-delete-patterns.md 11 KB
- reference/tenant-handoffs.md 1.5 KB
- reference/tenant-migration.md 8.1 KB
- reference/tenant-provisioning.md 10 KB
- reference/tenant-quota-throttling.md 9.7 KB
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.
- 3d ago Changed · +1 lines 5b66e88f1504
- 8d ago Changed 785dfdab2d46
- 1mo ago Changed · -1 lines 33e0343289ba
- 1mo ago Changed · +37 tokens per session 09dac0172c31
- 1mo ago First seen · 299 lines · 0 tokens per session scan A 6cdbd539fa24
schema is a skill published in the GitHub repository simota/agent-skills (95 stars, last pushed today), licensed MIT. It adds 37 tokens to every session and 4,797 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 2026-09-03.
Other skills, from other repositories
system-and-data-design
Decide whether the system will hold, and where the data lives: requirements and load first, then back-of-the-envelope numbers, building blocks (cache, queue, load balancer, CDN), and the data layer in depth — storage engines, indexes, replication, partitioning, transactions and consistency, batch vs stream. Use when…
sider
Category: Drug-centric | Type: DB | Subcategory: Adverse Drug Reaction (ADR) Link: http://sideeffects.embl.de/ | Paper: https://doi.org/10.1093/nar/gkv1075.
repodb-query
Query the RepoDB drug repurposing database. Use whenever the user asks about drug-disease associations, drug repurposing candidates, or wants to look up any entity (drug name, indication, DrugBank ID, UMLS CUI, NCT ID) in RepoDB.
backend-patterns
Backend architecture patterns, API design, database optimization, and server-side best practices for Node.js, Express, and Next.js API routes.
clickhouse-io
ClickHouse database patterns, query optimization, analytics, and data engineering best practices for high-performance analytical workloads.
database-migrations
Database migration best practices for schema changes, data migrations, rollbacks, and zero-downtime deployments across PostgreSQL, MySQL, and common ORMs (Prisma, Drizzle, Django, TypeORM, golang-migrate).