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 agentmods add skills/wyattowalsh/agents/database-architectnpx skills add wyattowalsh/agents --skill database-architectgit clone --depth 1 https://github.com/wyattowalsh/agentsWrote 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/wyattowalsh/agents/database-architect)<a href="https://agentmods.dev/skills/wyattowalsh/agents/database-architect"><img src="https://agentmods.dev/badge/skills/wyattowalsh/agents/database-architect.svg" alt="Measured on agentmods" 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 | $0.00041 | $0.02189 |
| Opus 5 | $0.00020 | $0.01094 |
| Sonnet 5 | $0.00008 | $0.00438 |
| Haiku 4.5 | $0.00004 | $0.00219 |
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 4d 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 — 266 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Database Architect
Schema design, migration planning, query optimization, and zero-downtime schema evolution.
Scope: Database architecture decisions only. NOT for DBA operations, backup management, deployment strategies (use devops-engineer), or vector DB patterns (use data-wizard).
Dispatch
| $ARGUMENTS | Mode |
|---|---|
design <requirements> |
Design: generate schema DDL from requirements |
migrate <description> |
Migrate: migration SQL with rollback plan |
review <schema or migration path> |
Review: audit existing schema or migration files |
optimize <query or table> |
Optimize: index and query optimization |
evolve |
Evolve: codebase-wide schema evolution analysis |
| Empty | Show mode menu with examples |
Canonical Vocabulary
| Term | Definition |
|---|---|
| schema | Complete DDL definition: tables, columns, constraints, indexes |
| migration | A versioned, reversible schema change with up/down operations |
| zero-downtime | Schema change that requires no application downtime (expand-contract) |
| expand-contract | Two-phase migration: expand (add new), contract (remove old) |
| normalization level | 1NF through 5NF classification of table structure |
| index coverage | Percentage of query patterns served by existing indexes |
| data loss risk | Whether a migration operation can destroy existing data |
| backwards compatible | Migration that works with both old and new application code |
| hot path | Query pattern executed at high frequency requiring optimization |
| covering index | Index containing all columns needed to satisfy a query |
| partial index | Index with a WHERE clause filtering indexed rows |
| cardinality | Number of distinct values in a column relative to total rows |
Mode 1: Design
Generate schema DDL from natural language requirements.
Design Step 1: Gather Requirements
Parse requirements from $ARGUMENTS. Identify:
- Entities and their relationships (1:1, 1:N, M:N)
- Required constraints (unique, not null, check, foreign key)
- Expected query patterns and access paths
- Target database engine (default: PostgreSQL)
What ships with it
23 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.
- evals/evals.json 2.1 KB
- evals/implicit-trigger.json 493 B
- evals/migrate-mode.json 934 B
- evals/negative-control.json 375 B
- evals/optimize-mode.json 922 B
- evals/schema-design.json 545 B
- references/db-idioms.md 3.8 KB
- references/migration-patterns.md 2.8 KB
- references/normalization-guide.md 2.9 KB
- references/query-optimization.md 3.4 KB
- references/zero-downtime-checklist.md 2.4 KB
- scripts/asset_toolkit/__init__.py 303 B runs code
- scripts/asset_toolkit/_shared.py 5.6 KB runs code
- scripts/asset_toolkit/common.py 3.0 KB runs code
- scripts/asset_toolkit/package.py 43 KB runs code
- scripts/asset_toolkit/validate_evals.py 11 KB runs code
- scripts/asset_toolkit/validate_hooks.py 13 KB runs code
- scripts/asset_toolkit/validate_skill.py 3.6 KB runs code
- scripts/check.py 2.2 KB runs code
- scripts/index-recommender.py 10 KB runs code
- scripts/migration-validator.py 9.4 KB runs code
- scripts/schema-analyzer.py 12 KB runs code
- templates/dashboard.html 8.9 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.
- 4d ago First seen · 266 lines · 41 tokens per session scan A ce3218524dca
database-architect is a skill published in the GitHub repository wyattowalsh/agents (5 stars, last pushed yesterday), licensed MIT. It adds 41 tokens to every session and 2,189 once invoked, about $0.0002 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 2026-08-31.
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