# Event Store Design

Design and implement event stores for event-sourced systems.

- Repository: https://github.com/wshobson/agents (42077 stars)
- Category: Design
- License: MIT
- Last updated: 2026-10-30
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add wshobson/agents --skill event-store-design -g -a claude-code -y`
Codex: `npx skills add wshobson/agents --skill event-store-design -g -a codex -y`
Cursor: `npx skills add wshobson/agents --skill event-store-design -g -a cursor -y`
Gemini CLI: `npx skills add wshobson/agents --skill event-store-design -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add wshobson/agents`

## Description

Design and implement event stores for event-sourced systems. Use when building event sourcing infrastructure, choosing event store technologies, or implementing event persistence patterns.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Event Store Design

Comprehensive guide to designing event stores for event-sourced applications.

## When to Use This Skill

- Designing event sourcing infrastructure
- Choosing between event store technologies
- Implementing custom event stores
- Optimizing event storage and retrieval
- Setting up event store schemas
- Planning for event store scaling

## Core Concepts

### 1. Event Store Architecture

```
┌─────────────────────────────────────────────────────┐
│                    Event Store                       │
├─────────────────────────────────────────────────────┤
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐ │
│  │   Stream 1   │  │   Stream 2   │  │   Stream 3   │ │
│  │ (Aggregate)  │  │ (Aggregate)  │  │ (Aggregate)  │ │
│  ├─────────────┤  ├─────────────┤  ├─────────────┤ │
│  │ Event 1     │  │ Event 1     │  │ Event 1     │ │
│  │ Event 2     │  │ Event 2     │  │ Event 2     │ │
│  │ Event 3     │  │ ...         │  │ Event 3     │ │
│  │ ...         │  │             │  │ Event 4     │ │
│  └─────────────┘  └─────────────┘  └─────────────┘ │
├─────────────────────────────────────────────────────┤
│  Global Position: 1 → 2 → 3 → 4 → 5 → 6 → ...     │
└─────────────────────────────────────────────────────┘
```

### 2. Event Store Requirements

| Requirement       | Description                        |
| ----------------- | ---------------------------------- |
| **Append-only**   | Events are immutable, only appends |
| **Ordered**       | Per-stream and global ordering     |
| **Versioned**     | Optimistic concurrency control     |
| **Subscriptions** | Real-time event notifications      |
| **Idempotent**    | Handle duplicate writes safely     |

## Technology Comparison

The rest: https://github.com/wshobson/agents/blob/HEAD/plugins/backend-development/skills/event-store-design/SKILL.md