command-repo-spec-schema-writer

command-repo-spec-schema-writer is an agent for Claude Code from voro6yov/spec-driven-development. It costs 46 tokens per session (4,365 once invoked), scanned A, original, Apache-2.0.

A schema-documentation agent that derives SQL tables, columns, indexes, and an entity-relationship diagram from a domain class diagram, then writes them into Section 3 of a persistence specification.

In plain words
What is it for?
Use it to generate or refresh the SQL schema section for an aggregate, including its parent table, child tables, and indexes.
Why use it?
It keeps the database design in the specification aligned with the domain model and can replace outdated schema details after changes.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the persistence-spec plugin — 2 skills, 23 agents shipped together

Good fit Use it to generate or refresh the SQL schema section for an aggregate, including its parent table, child tables, and indexes.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/voro6yov/spec-driven-development/command-repo-spec-schema-writer
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.

Clone the repo
git clone --depth 1 https://github.com/voro6yov/spec-driven-development

Made for: Claude Code.

Or install persistence-spec, the plugin that ships this one along with the rest of its 2 skills, 23 agents.

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 command-repo-spec-schema-writer

README.md
[![agentmods](https://agentmods.dev/badge/agents/voro6yov/spec-driven-development/command-repo-spec-schema-writer/github.svg)](https://agentmods.dev/agents/voro6yov/spec-driven-development/command-repo-spec-schema-writer)
Your own site
<a href="https://agentmods.dev/agents/voro6yov/spec-driven-development/command-repo-spec-schema-writer"><img src="https://agentmods.dev/badge/agents/voro6yov/spec-driven-development/command-repo-spec-schema-writer/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 command-repo-spec-schema-writer

Your own site · 80×15
<a href="https://agentmods.dev/agents/voro6yov/spec-driven-development/command-repo-spec-schema-writer"><img src="https://agentmods.dev/badge/agents/voro6yov/spec-driven-development/command-repo-spec-schema-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 46 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 4,365 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.
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 $0.00046 $0.04365
Opus 5.5 $0.00018 $0.01746
Sonnet 5.5 $0.00009 $0.00873
Haiku 4.5 $0.00005 $0.00436

Measured 12d ago against content hash e295f2f51725, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

command-repo-spec-schema-writer 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 12d 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.

plugins/persistence-spec/agents/command-repo-spec-schema-writer.md · 118 lines

How it starts

The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a persistence schema writer. Your job is to fill — or, on a re-run, refresh — Section 3 of a command repository spec — do not ask the user for confirmation before writing.

This agent is safe to re-run on an already-filled spec (the persistence-spec /update-specs orchestrator invokes it that way to regenerate §3 after a domain change). On every run it replaces the entire body of ## 3. Schema Specification — the ER diagram, the parent-table block, every child-table block, and the ### Indexes table — with a freshly-derived version. Sections 1 and 2 are never touched. On a freshly scaffolded file the replaced body is the template placeholders; on a re-run it is the prior output (including any child-table blocks the prior run appended).

Inputs

  • <domain_diagram> (first argument) — the source Mermaid class diagram. Contains aggregate fields, value-object/entity composition, and repository method signatures.
  • <dir> = directory containing <domain_diagram>.
  • <stem> = filename of <domain_diagram> without the .md suffix.
  • <spec_file> = <dir>/<stem>.persistence/command-repo-spec.md (must already exist; produced by @command-repo-spec-scaffolder and filled through Section 2 by @command-repo-spec-pattern-selector). Path derivation follows spec-core:naming-conventions.

If <spec_file> does not exist, stop and tell the user to run @command-repo-spec-scaffolder <domain_diagram> first.

Placeholder-detection rule (same as @command-repo-spec-migrations-writer and @table-implementer): a cell is a placeholder iff its raw text contains { or } (escaped as \{ / \} in the scaffolded template, but the braces themselves are still present). If any data row of §2 ### Tables, ### Mappers, ### Repository, or ### Context Integration carries a placeholder cell, or §1 Aggregate Summary's Multi-tenant? row still reads Yes / No, stop and tell the user to run @command-repo-spec-pattern-selector <domain_diagram> first — Section 3 is derived from those choices.

Read the full file on GitHub · 118 lines

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. 12d ago First seen · 118 lines · 46 tokens per session scan A e295f2f51725

Subscribe to this mod's changes

command-repo-spec-schema-writer is an agent published in the GitHub repository voro6yov/spec-driven-development (5 stars, last pushed 12d ago), licensed Apache-2.0. It adds 46 tokens to every session and 4,365 once invoked, about $0.0002 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 2026-10-04.

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