projection-patterns – Other skill for AI agents
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.
Install the projection-patterns skill with one command
Pick the tool you use, copy the command and paste it in your terminal. The skill lands in that tool's skills folder and is ready in your next session.
Claude Code
mkdir -p ~/.claude/skills && curl -fsSL https://skill.dn1nguoi.com/z/projection-patterns-ddec1.tgz | tar xz -C ~/.claude/skills
Call it in Claude Code: /projection-patterns – then describe the task you want done.
Codex
mkdir -p ~/.codex/skills && curl -fsSL https://skill.dn1nguoi.com/z/projection-patterns-ddec1.tgz | tar xz -C ~/.codex/skills
Call it in Codex: $projection-patterns – then describe the task you want done.
Hermes Agent
mkdir -p ~/.hermes/skills && curl -fsSL https://skill.dn1nguoi.com/z/projection-patterns-ddec1.tgz | tar xz -C ~/.hermes/skills
Call it in Hermes Agent: /projection-patterns – then describe the task you want done.
DeepSeek
mkdir -p ~/.deepcode/skills && curl -fsSL https://skill.dn1nguoi.com/z/projection-patterns-ddec1.tgz | tar xz -C ~/.deepcode/skills
Call it in DeepSeek: /projection-patterns – then describe the task you want done.
SKILL.md content
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.mdfor 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.
Example
For OrderItemAdded at position 42, apply the increment and persist checkpoint 42
in one transaction. Replay position 42 and verify no second increment; crash
before commit and verify both the row update and checkpoint roll back together.
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