Style Review Skill

Reviews C# changes for violations that dotnet format and .editorconfig cannot catch — behavioral patterns, naming conventions, and architectural rules.

What this skill does NOT check

.editorconfig + dotnet format already enforce (mechanically):

• var everywhere, no explicit types
• No this. qualifier
• Language keywords (string not String)
• Expression bodies
• Allman braces, newlines before {
• Null propagation (?., ??)
• Pattern matching over is/as casts
• Inlined variable declarations (out var x)
• Throw expressions, conditional delegate calls
• Modifier order
• File-scoped namespaces
• Object/collection initializers
• [] instead of new List<T>() / Array.Empty<T>()

Run dotnet format (or /lint) to fix those. Only continue with this skill for the behavioral checks below.

Steps

1. Get the diff

git diff          # unstaged changes
git diff --staged # staged changes
git diff main...HEAD  # full branch

2. Check behavioral rules

Async correctness (error-level):

• Public async methods must end in Async; private async methods must NOT
• Never .Result or .Wait() on an async call
• Library code must use .ConfigureAwait(false) on awaits
• All async methods should accept CancellationToken ct = default

Method design (error-level):

• Max 4 parameters — flag anything over that without a record/options object
• Boolean parameters must use named argument syntax at every call site
• Cyclomatic complexity > 7 branches in one method — flag and suggest extraction

Structural (error-level):

• No #region directives
• Class member order violated: fields → constructors → properties → methods (grouped by function, not visibility)

Return values (error-level):

• Methods returning collections must never return null — must return []
• Lookups should use the TryGet pattern, not null returns

Testing (style-level, in tests/ and tests-integration/):

• New test projects should use TUnit + AwesomeAssertions, not xUnit directly
• Test method naming: MethodName_Scenario_Expected
• No assertions without fluent style (Should().Be(...) not Assert.Equal(...))

Comments (style-level):

• Comments that describe what the code does (not why) — flag for removal
• Multi-paragraph docstrings on non-public members
• #region (already error-level above)

3. Report

Format violations as a numbered list with severity:

ERROR:
1. src/Elastic.Markdown/Foo.cs:42 — public async method `GetData` missing `Async` suffix
2. src/Elastic.Markdown/Foo.cs:67 — `.Result` blocks on async call; use `await`

STYLE:
3. tests/Elastic.Markdown.Tests/Bar.cs:15 — test name `TestGetUser` should follow `GetUser_ValidId_ReturnsUser` pattern

If no violations: "No behavioral style violations found."

4. Do NOT auto-fix

Report only. For formatting issues, run /lint. For logic violations (blocking async, null collections), the developer must fix manually.