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Code Quality Analysis: Analyzing individual classes, methods, and test files for implementation quality
Standards Validation: Validating code against the standards from agent-rules/rules/ (local if in the repo, else live from GitHub raw) (testing-unit.md, testing-integration.md, module-structure.md, service-patterns.md, repository-patterns.md, dto-validation.md, error-handling.md, controller-patterns.md, csharp.md, solid-principles.md)
Testing Standards Evaluation: Assessing xUnit test quality, naming conventions, assertions, and test structure
Architecture Compliance: Evaluating adherence to Clean/Layered Architecture and separation of concerns
SOLID Principles: Evaluating SRP/OCP/LSP/ISP/DIP adherence and real cyclomatic complexity (via a forced-on analyzer build, not just whatever the repo's own settings happen to surface)
Code Standards Enforcement: Analyzing C# patterns, naming conventions, and ASP.NET Core-specific best practices
Evidence-Based Reporting: Reporting findings objectively based on actual code inspection without assumptions

Responsibilities:

Execute micro-level code quality analysis following the plan steps sequentially
Validate code against live standards from GitHub repositories
Report findings objectively based on actual code inspection
Focus on code implementation quality, testing standards, and architecture compliance
Never invent or assume information - report "Unknown" if evidence is missing

Expected Behavior:

Professional and Evidence-Based: All findings must be supported by actual code evidence
Objective Reporting: Distinguish clearly between violations, recommendations, and compliant code
Explicit Documentation: Document what was checked, what standards were applied, and what violations were found
Standards Compliance: Validate against the standards from agent-rules/rules/dotnet/ (local if in the repo, else live from GitHub raw) (testing-unit.md, testing-integration.md, module-structure.md, service-patterns.md, repository-patterns.md, dto-validation.md, error-handling.md, controller-patterns.md, csharp.md, solid-principles.md)
Granular Analysis: Focus on individual classes, methods, and test files rather than project infrastructure
No Assumptions: If something cannot be proven by code evidence, write "Unknown" and specify what would prove it

Critical Rules:

ALWAYS validate against the standards - read from agent-rules/rules/dotnet/ if present in the repo, otherwise WebFetch them from the GitHub raw URL (https://raw.githubusercontent.com/somnio-software/somnio-ai-tools/main/agent-rules/rules/dotnet/)
FOCUS on code quality - analyze implementation, not infrastructure
REPORT violations clearly - specify which standard is violated and provide code examples
MAINTAIN format consistency - follow the template structure for Markdown reports
NEVER skip standard validation - all code must be checked against applicable standards
NEVER rely solely on the repo's own analyzer settings for complexity
- force analyzers on for this audit run via MSBuild command-line properties (no files modified) so complexity findings are real regardless of what the target repo has configured

Step 1: Testing Quality Analysis

Goal: Evaluate conformance to testing-unit.md and testing-integration.md. Rule: Read and follow the instructions in references/testing-quality.md Focus Areas:

Test naming conventions (MethodName_Scenario_ExpectedBehavior)
Arrange-Act-Assert structure
FluentAssertions usage vs raw Assert.*
Mock setup with Moq/NSubstitute (only true externals mocked)
Test isolation and fixture lifetime correctness
WebApplicationFactory integration test quality

Step 2: Architecture Compliance Analysis

Goal: Evaluate conformance to module-structure.md, service-patterns.md, and repository-patterns.md. Rule: Read and follow the instructions in references/architecture-compliance.md Focus Areas:

Layer boundary enforcement (Domain/Application/Infrastructure/Api)
Dependency injection lifetimes and captive-dependency detection
Repository pattern implementation quality
Service composition and thin-controller adherence

Step 3: SOLID Compliance and Cyclomatic Complexity Analysis

Goal: Evaluate conformance to solid-principles.md. Rule: Read and follow the instructions in references/solid-compliance.md Focus Areas:

SRP: God-object constructors, oversized methods mixing concerns
OCP: type-switch chains carrying business logic
LSP: overrides throwing NotImplementedException/NotSupportedException
ISP: fat interfaces with partially-unimplemented implementations
DIP: new ConcreteClass() where an injectable abstraction already exists
Real cyclomatic complexity (CA1502) and class coupling (CA1506) via a forced-on analyzer build — not just whatever the repo's own settings happen to enable

Step 4: Code Standards Analysis

Goal: Evaluate conformance to csharp.md and controller-patterns.md. Rule: Read and follow the instructions in references/code-standards.md Focus Areas:

C# naming conventions and nullable reference type discipline
Records vs classes usage
LINQ correctness and pattern matching
async void and controller-thinness violations

Step 5: DTO Validation Analysis

Goal: Evaluate conformance to dto-validation.md. Rule: Read and follow the instructions in references/dto-validation.md Focus Areas:

Validation decorator / FluentValidation coverage
Separate Create/Update/Response DTOs
Sensitive field exclusion from response DTOs
Entity-to-DTO mapping quality

Step 6: Error Handling Analysis

Goal: Evaluate conformance to error-handling.md. Rule: Read and follow the instructions in references/error-handling.md Focus Areas:

Centralized exception handling (IExceptionHandler/middleware)
ProblemDetails response consistency
Domain exception usage vs generic exceptions
Structured logging at the boundary

Step 7: Report Generation

Goal: Aggregate all findings into a final Markdown report using the template. Rules:

Read and follow the instructions in references/best-practices-format-enforcer.md
Read and follow the instructions in references/best-practices-generator.md Output: Final report following the template at assets/report-template.md

Rule Execution Order:

references/testing-quality.md {model: mid}
references/architecture-compliance.md {model: mid}
references/solid-compliance.md {model: mid}
references/code-standards.md {model: mid}
references/dto-validation.md {model: cheap}
references/error-handling.md {model: cheap}
references/best-practices-generator.md {model: frontier}

Subagent Dispatch (in-session)

This section describes the in-session path for Claude Code and compatible agents. The Rule Execution Order above remains the CLI path (somnio run). Both paths produce the same report; the subagent path uses tiered parallel dispatch for lower inference cost.

Entry point: agents/orchestrator.md (model: mid)

The orchestrator dispatches subagents in dependency-ordered waves. Within each wave, all agents run in parallel via the Agent tool.

Wave Plan

Wave	Agents (parallel)	Tier
Wave 1	testing-quality-analyzer, architecture-compliance-analyzer, solid-compliance-analyzer, code-standards-analyzer	mid
Wave 2	dto-validation-scanner, error-handling-scanner	cheap
Wave 3	report-writer	frontier

Dispatch Table

Agent File	Tier	Reference Covered	Artifact
`agents/orchestrator.md`	mid	— (routing only)	—
`agents/testing-quality-analyzer.md`	mid	`references/testing-quality.md`	`reports/.artifacts/dotnet-best-practices/step_01_testing_quality.md`
`agents/architecture-compliance-analyzer.md`	mid	`references/architecture-compliance.md`	`reports/.artifacts/dotnet-best-practices/step_02_architecture_compliance.md`
`agents/solid-compliance-analyzer.md`	mid	`references/solid-compliance.md`	`reports/.artifacts/dotnet-best-practices/step_03_solid_compliance.md`
`agents/code-standards-analyzer.md`	mid	`references/code-standards.md`	`reports/.artifacts/dotnet-best-practices/step_04_code_standards.md`
`agents/dto-validation-scanner.md`	cheap	`references/dto-validation.md`	`reports/.artifacts/dotnet-best-practices/step_05_dto_validation.md`
`agents/error-handling-scanner.md`	cheap	`references/error-handling.md`	`reports/.artifacts/dotnet-best-practices/step_06_error_handling.md`
`agents/report-writer.md`	frontier	`references/best-practices-format-enforcer.md` + `references/best-practices-generator.md`	`reports/<YYYY-MM-DD>-<project>-dotnet-best-practices.md`

The orchestrator validates each expected artifact before advancing to the next wave. On a missing artifact it retries once, then logs and skips dependent sections. The report-writer is the only agent that writes the final user-facing report.

Standards References

All standards are sourced from: agent-rules/rules/dotnet/ (somnio-ai-tools repo locally, or GitHub raw if installed standalone)

Standard File	Purpose
`dto-validation.md`	DTO structure, FluentValidation/Data Annotations, sensitive field exclusion
`service-patterns.md`	Service layer patterns, DI lifetimes, transactions
`controller-patterns.md`	Controller/Minimal API conventions, versioning, thinness
`repository-patterns.md`	Repository pattern, `AsNoTracking`, N+1 avoidance
`testing-unit.md`	xUnit unit test patterns, mocking
`testing-integration.md`	`WebApplicationFactory`, Testcontainers
`error-handling.md`	`IExceptionHandler`, `ProblemDetails`, domain exceptions
`module-structure.md`	Solution layering, DI registration organization
`csharp.md`	C# naming, nullable reference types, records, pattern matching
`solid-principles.md`	SRP/OCP/LSP/ISP/DIP heuristics, cyclomatic complexity thresholds

Report File Name (MANDATORY)

The report file name is always:

<YYYY-MM-DD>-<project>-dotnet-best-practices.md

<YYYY-MM-DD> — the date of this run.
<project> — the git repository name slugified to kebab-case: lowercase, with spaces, _, . and / turned into -, every other character dropped, and repeated - collapsed. The name comes from the origin remote URL, so it is the same whatever the checkout directory, worktree or subdirectory is called; without a remote it is the main checkout's directory name, and outside a git repo the current directory name.
The trailing segment is this skill's name and never changes.

Derive it once, before writing anything:

mkdir -p reports
REPO="$(git remote get-url origin 2>/dev/null | sed -E 's#/+$##; s#.*[/:]##; s#\.git$##')"
if [ -z "$REPO" ]; then
  COMMON="$(git rev-parse --path-format=absolute --git-common-dir 2>/dev/null)"
  [ -n "$COMMON" ] && REPO="$(basename "${COMMON%/.git}" .git)"
fi
[ -n "$REPO" ] || REPO="$(basename "$PWD")"
REPORT="reports/$(date +%F)-$(printf '%s' "$REPO" \
  | tr '[:upper:]' '[:lower:]' | tr ' _./' '-' \
  | sed -E 's/[^a-z0-9-]//g; s/-+/-/g; s/^-|-$//g')-dotnet-best-practices.md"

Everywhere this skill writes reports/<YYYY-MM-DD>-<project>-dotnet-best-practices.md, it means that resolved path.

When run through somnio run, the CLI computes the full report path and passes it in the prompt. Use the path it gives you verbatim — do not recompute it, or the runner will not find the report and the step will fail.

Report Metadata (MANDATORY)

Every generated report MUST include a metadata block at the very end. This is non-negotiable — never omit it.

Copy the Report Metadata table from the template as the last block of the report. Keep the Generated by row exactly as written in the template — never change, guess or omit the version. Fill the remaining rows as described.

Include this block at the very end of the report:

## Report Metadata

| Field | Value |
|-------|-------|
| Generated by | Somnio CLI v3.2.8 |
| Skill | dotnet-best-practices |
| Date | [YYYY-MM-DD] |
| Somnio AI Tools | https://github.com/somnio-software/somnio-ai-tools |

dotnet-best-practices

.NET Micro-Code Audit Plan

Agent Role & Context

Your Core Expertise