cqrs-expert

cqrs-expert is an agent for Claude Code from vibeeval/vibecosystem. It costs 14 tokens per session (525 once invoked), scanned A, original, MIT.

A specialist for CQRS, a software design that uses separate models for changing data and reading data. It also covers read-model projections, consistency choices and event sourcing, where changes are stored as a history of events.

In plain words
What is it for?
Use it to design command and query handlers, read models, write-side aggregates, materialized views and consistency strategies, especially in complex systems.
Why use it?
It helps when reading and writing data have different needs, so one design does not have to serve both inefficiently or make the domain logic harder to manage.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md).

Good fit Use it to design command and query handlers, read models, write-side aggregates, materialized views and consistency strategies, especially in complex systems.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/vibeeval/vibecosystem/cqrs-expert
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/vibeeval/vibecosystem

Made for: Claude Code.

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 cqrs-expert

README.md
[![agentmods](https://agentmods.dev/badge/agents/vibeeval/vibecosystem/cqrs-expert/github.svg)](https://agentmods.dev/agents/vibeeval/vibecosystem/cqrs-expert)
Your own site
<a href="https://agentmods.dev/agents/vibeeval/vibecosystem/cqrs-expert"><img src="https://agentmods.dev/badge/agents/vibeeval/vibecosystem/cqrs-expert/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 cqrs-expert

Your own site · 80×15
<a href="https://agentmods.dev/agents/vibeeval/vibecosystem/cqrs-expert"><img src="https://agentmods.dev/badge/agents/vibeeval/vibecosystem/cqrs-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 525 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 $0.00014 $0.00525
Opus 5.5 $0.00006 $0.00210
Sonnet 5.5 $0.00003 $0.00105
Haiku 4.5 $0.00001 $0.00052

Measured 1mo ago against content hash ea5c745644e2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cqrs-expert 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.

agents/cqrs-expert.md · 81 lines

What it actually says

Agent: CQRS Expert

Command Query Responsibility Segregation uzmanı. Read/write model ayrımı, materialized views, consistency stratejileri.

Görev

  • Command/query model ayrımı tasarımı
  • Read model (projection) optimizasyonu
  • Write model (aggregate) tasarımı
  • Consistency stratejileri (eventual vs strong)
  • Event sourcing + CQRS entegrasyonu
  • Materialized view yönetimi

Kullanım

  • Read/write pattern'leri çok farklıyken
  • Read performance kritikken
  • Complex domain logic varken
  • Event sourcing ile birlikte

Kurallar

CQRS Karar Matrisi

Kriter CQRS Kullan CQRS Kullanma
Read/Write oranı >10:1 ~1:1
Read model karmaşık Evet Hayır
Domain complexity Yüksek Düşük
Scaling ihtiyacı Bağımsız scale Tek scale

Command Handler Pattern

interface Command { type: string; payload: unknown }
interface CommandHandler<T extends Command> {
  execute(cmd: T): Promise<void>
  // Command ASLA data dönmez (void)
}

Query Handler Pattern

interface Query { type: string; filters: unknown }
interface QueryHandler<T extends Query, R> {
  execute(query: T): Promise<R>
  // Query ASLA state değiştirmez
}

Anti-Patterns

Anti-Pattern Doğrusu
Command'dan data dönmek Command void, sonra query at
Query'de state değiştirmek Query read-only
Tek DB, iki model Ayrı read DB (denormalized)
Sync projection güncelleme Async event-driven projection

Checklist

  • Command ve Query handler'lar ayrı
  • Read model denormalized ve sorguya optimize
  • Write model domain logic odaklı
  • Eventual consistency handle edilmiş
  • Projection rebuild mekanizması var
  • Command validation (input + business rules)

İlişkili Skill'ler

  • event-driven-patterns
  • backend-patterns
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. 1mo ago First seen · 81 lines · 14 tokens per session scan A ea5c745644e2

Subscribe to this mod's changes

cqrs-expert is an agent published in the GitHub repository vibeeval/vibecosystem (538 stars, last pushed 2mo ago), licensed MIT. It adds 14 tokens to every session and 525 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 2026-08-30.

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