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 codebygarv/Ai-skills --skill cqrs-event-sourcing-designergit clone --depth 1 https://github.com/codebygarv/Ai-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/codebygarv/ai-skills/cqrs-event-sourcing-designer)<a href="https://agentmods.dev/skills/codebygarv/ai-skills/cqrs-event-sourcing-designer"><img src="https://agentmods.dev/badge/skills/codebygarv/ai-skills/cqrs-event-sourcing-designer/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/codebygarv/ai-skills/cqrs-event-sourcing-designer"><img src="https://agentmods.dev/badge/skills/codebygarv/ai-skills/cqrs-event-sourcing-designer.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 | $0.00030 | $0.00362 |
| Opus 5 | $0.00015 | $0.00181 |
| Sonnet 5 | $0.00006 | $0.00072 |
| Haiku 4.5 | $0.00003 | $0.00036 |
Grade A, and why
cqrs-event-sourcing-designer 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 11d 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.
What it actually says
Purpose
Architect Command Query Responsibility Segregation (CQRS) and Event Sourcing (ES) systems, separating write-side domain command handling from read-side materialized view projections with full auditability.
When to Use
- High-compliance domains requiring immutable audit logs (Fintech, Healthcare, Legal, Supply Chain).
- Systems with asymmetric read/write ratios and complex reporting queries.
- Designing collaborative workspaces with branch/merge or time-travel history.
What to Analyze
- Command vs Query Separation: Command handlers (validate and emit events) vs Query handlers (read denormalized projections).
- Event Store Architecture: Append-only immutable log (
aggregate_id,version,event_type,payload) with optimistic concurrency control. - Projection & Read Model Synchronization: Asynchronous event handlers building denormalized views in Postgres/Elastic/Redis.
- Snapshotting Strategy: Periodic aggregate state snapshots to prevent slow replays on aggregates with 10,000+ events.
- Rebuilding & Migration: Ability to replay event streams from scratch to generate new projection tables.
Output Format
- CQRS / ES Architecture Blueprint: Command, Event Store, Projection, and Query read path diagram.
- Event Store DDL & Aggregate Class: Append-only schema with version-checking optimistic locks.
- Projection Worker Code: Consumer updating materialized read models.
Avoid
- Applying CQRS and Event Sourcing to simple CRUD applications (unnecessary operational complexity).
- Mutating historical events in the event store.
What ships with it
2 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.
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.
- 11d ago First seen · 34 lines · 30 tokens per session scan A 3dab38c37e30
cqrs-event-sourcing-designer is a skill published in the GitHub repository codebygarv/Ai-skills (25 stars, last pushed 22d ago), licensed MIT. It adds 30 tokens to every session and 362 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
bun-api
Bun runtime API reference for TypeScript scripts. Covers Bun.serve() HTTP/HTTP/2 server with routes and WebSockets, fetch() transport options, Bun.file(), Bun.write(), Bun.$() shell, Bun.spawn(), Bun.Glob, Bun.env, bun:sqlite, Bun.sql() for PostgreSQL/MySQL via DATABASEURL, Bun.s3 for S3-compatible storage, Bun.redis…
ds-backend
Backend architecture — API design, database schema, authentication, data pipelines. Use when designing or reviewing a backend, REST/GraphQL APIs, data models, auth flows, or ingest/ETL pipelines.
persistence-patterns
Use this skill when implementing database persistence, choosing a data source pattern, managing repository interfaces, writing mappers, or splitting large repositories. Assumes the decision between a rich domain model and a lean ORM model has already been made by the domain-modeling skill.
supabase-node
Express/Hono with Supabase and Drizzle ORM.
nodejs-backend
Node.js backend patterns with Express/Fastify, repositories.
django-patterns
Django architecture patterns, REST API design with DRF, ORM best practices, caching, signals, middleware, and production-grade Django apps.