Skills cqs-patterns
📦

cqs-patterns

Content revision r1 Safe ⚙️ External commands

Apply CQS and CQRS Patterns in .NET

Teams often mix state changes and data reads, which makes code harder to test and reason about. This skill guides clear CQS and CQRS designs for .NET methods, handlers, and controllers.

Supports: Claude Codex Code(CC)
🥉 77 Bronze

Install with my Agent

Copy this request to your Agent. It includes the canonical Skill page and manifest.

Agent request
Review the Skillstore skill "cqs-patterns" from https://skillstore.io/skills/doubleslashse-cqs-patterns.md and its manifest at https://skillstore.io/api/skills/doubleslashse-cqs-patterns/manifest. Verify the artifact. You may proceed after verification, subject to the environment's own policy.

Your Agent should still show its plan and request any confirmation required by the security policy.

Agent-readable resources

Use these links when an AI agent, crawler, or script needs clean context instead of reading the full page.

Markdown detail GET /skills/doubleslashse-cqs-patterns.md Signed manifest GET /api/skills/doubleslashse-cqs-patterns/manifest Signed lockfile GET /api/skills/doubleslashse-cqs-patterns/lockfile

Test it

Using "cqs-patterns". A stack class has one method that removes and returns the top item.

Expected outcome:

  • The method mixes a command and a query.
  • Use one operation to inspect the top item and a separate operation to remove it.
  • This keeps repeated reads safe and makes state changes explicit.

Using "cqs-patterns". An order feature needs create, cancel, lookup, and customer order list operations.

Expected outcome:

  • Create and cancel are commands because they change state.
  • Lookup and list operations are queries because they return data without side effects.
  • Separate handlers make validation, persistence, and read optimization easier to test.

Using "cqs-patterns". A small CRUD admin page is being considered for CQRS.

Expected outcome:

  • CQRS may add unnecessary complexity for a simple admin workflow.
  • Use it only if read and write models have meaningfully different needs.
  • A standard service or controller may be enough.

Security Audit

Safe
v9 • 7/6/2026 Open versioned report

All static findings appear to be false positives caused by Markdown code fences, ASCII diagrams, and C# examples in documentation. I found no prompt injection, data exfiltration intent, executable scripts, network behavior, or real system reconnaissance in SKILL.md.

1
Files scanned
532
Lines analyzed
0
Review items
0
False positives ignored

Risk Factors

⚙️ External commands (25)
SKILL.md:13-26 SKILL.md:26-33 SKILL.md:33-66 SKILL.md:66-69 SKILL.md:69-122 SKILL.md:122-131 SKILL.md:131-143 SKILL.md:143-146 SKILL.md:146-162 SKILL.md:162-165 SKILL.md:165-176 SKILL.md:176-184 SKILL.md:184-213 SKILL.md:213-217 SKILL.md:217-254 SKILL.md:254-258 SKILL.md:258-330 SKILL.md:330-334 SKILL.md:334-398 SKILL.md:398-402 SKILL.md:402-440 SKILL.md:440-444 SKILL.md:444-482 SKILL.md:482-518 SKILL.md:518-531
No confirmed security findings were detected by the latest completed static and semantic audit. This does not prove the skill has no side effects.
Audited by: codex View Audit History →
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Open versioned report
Security Assessment

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Academic citations (APA · BibTeX · CFF)

APA citation

DoubleslashSE. (2026). cqs-patterns security audit report (audit version 9) [Author version unspecified]. Skillstore. https://skillstore.io/skills/doubleslashse-cqs-patterns/audits/9

BibTeX citation

@techreport{doubleslashse-doubleslashse-cqs-patterns-2026, author = {DoubleslashSE}, title = {cqs-patterns security audit report (audit version 9)}, institution = {Skillstore}, year = {2026}, number = {9}, url = {https://skillstore.io/skills/doubleslashse-cqs-patterns/audits/9}, note = {Author version unspecified} }

CITATION.cff

cff-version: 1.2.0 message: "If you use this Skill, cite its author and this versioned security audit report." title: "cqs-patterns security audit report (audit version 9)" version: "unspecified" type: report authors: - name: "DoubleslashSE" date-released: "2026-07-06" url: "https://skillstore.io/skills/doubleslashse-cqs-patterns/audits/9" identifiers: - type: other value: "skillstore:doubleslashse-cqs-patterns:audit:9" description: "Skillstore immutable audit report identifier"

Skillstore Score

Why this score Evidence Confidence: High
55
Architecture
85
Maintainability
87
Content
70
Community
78
Spec Compliance

What You Can Build

Separate Service Methods

Review service methods that both modify state and return domain data, then split them into clearer commands and queries.

Design CQRS Handlers

Create command and query records with matching handlers for a .NET application layer.

Review Architecture Complexity

Decide whether a feature needs CQRS or whether simpler CRUD patterns are more appropriate.

Try These Prompts

Identify CQS Violations 
Review this .NET class for CQS violations. Identify methods that both change state and return data, then suggest simpler names and responsibilities.
Refactor to Commands and Queries 
Refactor this service API into separate command and query operations. Keep behavior equivalent and explain each new responsibility.
Design a CQRS Application Layer 
Design a CQRS application layer for this feature. Include command records, query records, handler responsibilities, and controller flow.
Evaluate CQRS Tradeoffs 
Assess whether CQRS fits this system. Compare benefits, added complexity, testing impact, read model needs, and alternatives.

Best Practices

  • Name commands with imperative verbs and queries with read-oriented names.
  • Keep queries free of side effects so they are safe to repeat.
  • Use CQRS when read and write paths have different models, scale, or rules.

Avoid

  • Returning full domain objects from methods that also persist changes.
  • Adding CQRS to simple CRUD screens without a clear need.
  • Hiding state changes inside getters, calculated properties, or query handlers.

Frequently Asked Questions

What problem does this skill solve?
It helps teams separate state-changing operations from read operations in .NET code.
Does it generate production-ready code?
It provides design guidance and examples that users must adapt to their application.
Is CQS the same as CQRS?
No. CQS is a method-level principle, while CQRS separates read and write models at the architecture level.
When should I avoid CQRS?
Avoid CQRS for simple CRUD workflows where separate read and write models do not add value.
Can commands return identifiers?
Yes. The skill treats returning an identifier from a command as an acceptable practical exception.
Which tools can use this skill?
The report lists support for Claude, Codex, and Claude Code.

Developer Details

License

MIT

Skillstore revision

r1

Version notice

The author did not declare a version.

Repository

https://github.com/DoubleslashSE/claude-workflows/tree/main/Plugins/dotnet-tdd/skills/cqs-patterns

Ref

72d5025b022c77f7a51bdf5c1637c689c80e89d1

Maintenance freshness

7/21/2026

Usage

5 downloads · 194 views

File structure

📄 SKILL.md