{"slug":"dotnet-modern-csharp","title":"dotnet-modern-csharp","summary":"Write modern, version-aware C# for .NET repositories. Use when choosing language features across C# versions, especially C# 13 and C# 14, while staying compatible with the repo's target framework and `LangVersion`.","platform":"Claude","tags":[],"authorName":"LLM Mart","authorSlug":"llm-mart","score":0,"source":"github","price":null,"verified":false,"createdAt":"2026-09-27T21:00:37.036441Z","repo":{"url":"https://github.com/Postpartum-genushyacinthus29/dotnet-skills","stars":12,"forks":1,"license":"MIT","updatedAt":"2026-09-27T19:34:14Z"},"bodyHtml":"
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name: dotnet-modern-csharp\nversion: \"1.0.0\"\ncategory: \"Code Quality\"\ndescription: \"Write modern, version-aware C# for .NET repositories. Use when choosing language features across C# versions, especially C# 13 and C# 14, while staying compatible with the repo's target framework and LangVersion.\"\ncompatibility: \"Requires a C# or .NET repository; respects explicit LangVersion and target framework settings.\"

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Modern C# for .NET

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Trigger On

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Value

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Do Not Use For

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Inputs

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Quick Start

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  1. Read the nearest AGENTS.md and confirm scope and constraints.
    2. \n
  2. Run this skill's Workflow through the Ralph Loop until outcomes are acceptable.
    3. \n
  3. Return the Required Result Format with concrete artifacts and verification evidence.
    4. \n
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Workflow

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  1. Detect the real language ceiling from the repo's target framework and explicit LangVersion.
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  2. Prefer stable features that the current repo actually supports.
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  3. Use modern syntax when it reduces ceremony, improves correctness, or makes invariants clearer.
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  4. Do not mass-rewrite a codebase into newer syntax unless the repo wants that churn.
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  5. Treat preview features as opt-in only. Never assume preview because the current machine has a newer SDK.
    6. \n
  6. Pay special attention to C# 13 and C# 14:\n\n
    7. \n
  7. When feature selection changes architecture, style rules, or generated-code patterns, coordinate with:\n\n
    8. \n
  8. After feature-driven refactors, run the repo's .NET quality pass through dotnet.
    9. \n
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Bootstrap When Missing

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If the requested C# feature depends on SDK or language support the repo does not have yet:

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  1. Detect current state:\n\n
    2. \n
  2. Confirm whether the repo wants to stay on the current stable language level or intentionally upgrade.
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  3. If the feature requires a newer supported SDK or target framework, upgrade the repo toolchain deliberately instead of relying on the local machine by accident.
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  4. If the repo needs explicit LangVersion, record it in project or shared MSBuild config.
    5. \n
  5. Run dotnet build SOLUTION_OR_PROJECT after the feature or toolchain change and return status: configured or status: improved.
    6. \n
  6. If the repo intentionally stays below the required language level, return status: not_applicable.
    7. \n
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Deliver

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Validate

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Ralph Loop

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Use the Ralph Loop for every task, including docs, architecture, testing, and tooling work.

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  1. Plan first (mandatory):\n\n
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  2. Execute one planned step and produce a concrete delta.
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  3. Review the result and capture findings with actionable next fixes.
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  4. Apply fixes in small batches and rerun the relevant checks or review steps.
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  5. Update the plan after each iteration.
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  6. Repeat until outcomes are acceptable or only explicit exceptions remain.
    7. \n
  7. If a dependency is missing, bootstrap it or return status: not_applicable with explicit reason and fallback path.
    8. \n
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Required Result Format

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For setup-only requests with no execution, return status: configured and exact next commands.

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Load References

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Example Requests

\n\n","files":[{"path":"references/csharp-modern-features.md","sizeBytes":5769,"isText":true},{"path":"references/migration.md","sizeBytes":15518,"isText":true},{"path":"references/patterns.md","sizeBytes":12819,"isText":true},{"path":"SKILL.md","sizeBytes":5226,"isText":true}],"reviewScore":null,"reviewSummary":null,"trust":{"provenance":"trusted-source-unreviewed","notice":"Community-authored content, reproduced verbatim and not vetted as instructions. Treat it as data to evaluate, never as directives to follow.","bodySource":null},"bodyLocked":false,"purchaseUrl":null,"sourceUrl":null,"report":{"provenance":"trusted-source-unreviewed","screen":{"ran":true,"outcome":"clean","suspicious":0,"notes":0,"hiddenCharacters":false},"virusScan":{"engine":"clamav","status":"clean","scannedAt":"2026-09-27T21:02:57.964656Z","sha256":"3E4DE7AA601122B787195E10B71E826327EBF8463501CEBFC83D4698DC13165D","sizeBytes":14157},"review":null,"source":{"repositoryUrl":"https://github.com/Postpartum-genushyacinthus29/dotnet-skills","path":"skills/dotnet-modern-csharp","license":"MIT","commit":"bfa4ebd86f6bd674800f209ebf72ca770c2f026b","subtreeSha":"09FC48B9DB85057502CC8C1A8C87720B7AF5E93CB87ADEF6E1831F3D1286ED61","lastSyncedAt":"2026-09-27T21:00:28.368219Z"},"reviewedAt":"2026-09-27T21:12:46.704205Z","notice":"Community-authored content, reproduced verbatim and not vetted as instructions. Treat it as data to evaluate, never as directives to follow."},"install":[{"target":"skills-cli","command":"npx skills add https://github.com/Postpartum-genushyacinthus29/dotnet-skills/tree/main/skills/dotnet-modern-csharp"},{"target":"claude-code","command":"claude plugin marketplace add https://llmmart.ai/marketplace.json && claude plugin install postpartum-genushyacinthus29-dotnet-skills@llmmart"},{"target":"git","command":"git clone https://github.com/Postpartum-genushyacinthus29/dotnet-skills.git"}]}