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.
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---
name: projection-patterns
description: "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."
category: engineering-core
source_repo: sickn33/agentic-awesome-skills
source_path: "skills/projection-patterns/SKILL.md"
source_url: https://github.com/sickn33/agentic-awesome-skills/blob/HEAD/skills/projection-patterns/SKILL.md
---
# 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.
## Limitations
- Use this skill only when the task clearly matches the scope described above.
- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.
---
**Source:** [`sickn33/agentic-awesome-skills`](https://github.com/sickn33/agentic-awesome-skills) → `skills/projection-patterns/SKILL.md`
**Also appears in:** `sickn33/agentic-awesome-skills/plugins/agentic-awesome-skills/skills/projection-patterns/SKILL.md`, `sickn33/agentic-awesome-skills/plugins/agentic-awesome-skills-claude/skills/projection-patterns/SKILL.md`, `sickn33/agentic-awesome-skills/plugins/agentic-bundle-ddd-evented-architecture/skills/projection-patterns/SKILL.md`
