# Projection Patterns

> Build read models and projections from event streams. Use when implementing CQRS read sides, building materialized views, or optimizing query performance in event-sourced systems.

- Skill: `nimoqup046-collab/projection-patterns` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add nimoqup046-collab/projection-patterns`
- Raw SKILL.md: https://api.skillmd.com/api/skills/nimoqup046-collab/projection-patterns/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: nimoqup046-collab (https://skillmd.com/u/nimoqup046-collab)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/nimoqup046-collab/projection-patterns

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# Projection Patterns

Comprehensive guide to building projections and read models for event-sourced systems.

## Use this skill when

- Building CQRS read models
- Creating materialized views from events
- Optimizing query performance
- Implementing real-time dashboards
- Building search indexes from events
- Aggregating data across streams

## Do not use this skill when

- The task is unrelated to projection patterns
- You need a different domain or tool outside this scope

## Instructions

- Clarify goals, constraints, and required inputs.
- Apply relevant best practices and validate outcomes.
- Provide actionable steps and verification.
- If detailed examples are required, open `resources/implementation-playbook.md`.

## Resources

- `resources/implementation-playbook.md` for detailed patterns and examples.