C# and .NET for Codex

894 mods tagged C# and .NET that install into Codex, measured the same four ways as everything else here: what each costs in tokens on every session, what a security scan found and why, whether it is the original, and what changed.

Also for Codex: anthropic · Git and workflow · Python · Web3 and blockchain · React · TypeScript · Go · openai · android · docker · Rust · bun

generate-code-cs

01

Azure/azure-sdk-for-net

Skill Claude CodeCodex needs its repo ✓ vendor

Generate the code from typespec for C#. Parameter: C# SDK repository root location .

not rated 6.1k +1 today A SkillSpector: pass 26 tokens original MIT

git-workflow

02

modelcontextprotocol/csharp-sdk

Skill Claude CodeCodex ✓ vendor

Follow this team's Git conventions for branching, commit messages, and pull requests.

not rated 4.6k +11 yesterday A 19 tokens

nuget

03

NuGet/Home

MCP server Claude CodeCodexCursor +2

MCP server "nuget" as configured in NuGet/Home. Launched with NuGet.Mcp.Server.

not rated 1.6k +1 17d ago A tokens not measured

fantasy-net

04

qq362946/Fantasy

Skill Claude CodeCodex

This guide applies to development and code review for Fantasy / Fantasy.Net / Fantasy.Unity written in C#. Use it when a task involves Fantasy server code or Unity client code using Fantasy, ECS entities/components/systems, scenes and subscenes, FTask, network handlers/messages/protocols, Address or Roaming routing…

not rated 1.5k +9 18d ago A SkillSpector: pass 157 tokens

aws/aws-graviton-getting-started

Skill Claude CodeCodex

Validates .NET application compatibility with AWS Graviton (ARM64) architecture by checking, by content, that every resolved NuGet package (including transitive) ships an aarch64 native file for each target runtime identifier and the target's C library, glibc, libstdc++ and page size, and by checking committed native…

not rated 1.1k +1 changed 2d ago A 224 tokens

pure-di

06

DevTeam/Pure.DI

Skill Claude CodeCodex

Implement or fix dependency injection with Pure.DI in a .NET project, including bindings, roots, lifetimes, tags, factories, scopes, and Pure.DI generator diagnostics. Use when the project references Pure.DI or the user asks to add it.

not rated 848 +2 yesterday A 55 tokens original MIT

clawdotnet/openclaw.net

Skill Claude CodeCodex

Extract structured insight briefs from community research transcripts or notes. Produces pain points, stakeholder needs, opportunity maps, risks, and follow-up questions. Requires human review before publication.

not rated 532 +3 yesterday A SkillSpector: pass 41 tokens original MIT

managedcode/dotnet-skills

Skill Claude CodeCodex

Use this skill before answering, planning, or editing any MSTest 3.x-to-4.x upgrade or post-upgrade failure. Triggers include "MSTest v4 breaking changes"; CS0507/CS0103/CS1061/CS1615; ExecuteAsync, CallerInfo, DisplayName, or custom TestMethodAttribute; ClassCleanupBehavior; ContainsKey; ThrowsExactly or…

not rated 508 +9 changed 2mo ago A SkillSpector: warn 179 tokens original MIT

mcp

09

xberg-io/tree-sitter-language-pack

Skill Claude CodeCodex

Use tree-sitter-language-pack mcp reference documentation.

not rated 482 +3 changed 1mo ago A SkillSpector: pass 14 tokens original MIT

bwfc-migration

10

FritzAndFriends/BlazorWebFormsComponents

Skill Claude CodeCodex needs its repo

Migrate ASP.NET Web Forms applications to Blazor Server using the webforms-to-blazor CLI tool and BlazorWebFormsComponents (BWFC). Orchestrates L1 automated transforms via CLI, then guides L2 contextual transforms. WHEN: "migrate aspx", "convert web forms", "web forms to blazor", "run migration". INVOKES…

not rated 455 +1 4mo ago A SkillSpector: warn 115 tokens original MIT

isuzu-unity-cli

11

isuzu-shiranui/UnityMCP

Skill Claude CodeCodex

Drive the open Unity Editor from the shell with the isuzu-unity-cli command: console errors, compiling and tests, scenes, GameObjects and components, prefabs, play mode, uGUI clicks, and C# run inside the Editor. SKILL.md gives a command for each common task, so no tool list is needed.

not rated 340 +2 changed 1mo ago A SkillSpector: warn 73 tokens original MIT

SebastienDegodez/copilot-instructions

Skill Claude CodeCodex

Use when domain logic leaks into API/Infrastructure, project references violate layer boundaries, or you need to decide between CQS (always), CQRS bus (complex domains), and DDD patterns (invariants and events).

not rated 199 1mo ago A SkillSpector: pass 50 tokens original Apache-2.0

dev-cycle

13

xberg-io/crawlberg

Skill Claude CodeCodex

Crawlberg mise task loops for alef regeneration, core and binding builds, e2e generate/build/test and cleanup, plus known e2e gotchas. Use when unsure which task to run, or when a crawlberg build, alef regen or e2e run misbehaves.

not rated 195 +1 changed 6d ago A SkillSpector: pass 60 tokens original MIT

Hex1b.McpServer

14

mitchdenny/hex1b

Skill Claude CodeCodex

This skill provides guidance for AI agents working with the Hex1b TUI (Terminal User Interface) library and its MCP diagnostic tools.

not rated 181 3d ago A SkillSpector: pass 0 tokens original MIT

dotnet-inspect

15

AgentEvalHQ/AgentEval

Skill Claude CodeCodex

Query .NET APIs across NuGet packages, platform libraries, and local files. Search for types, list API surfaces, compare and diff versions, find extension methods and implementors. Use whenever you need to answer questions about .NET library contents.

not rated 158 +1 today A SkillSpector: warn 54 tokens original MIT

roslynk

16

mrpmorris/Roslynk

Skill Claude CodeCodex

Use Roslynk for semantic inspection and edits of .cs, .razor and .cshtml solution files.

not rated 152 changed 23d ago A SkillSpector: pass 27 tokens original MIT

Aiko-IT-Systems/DisCatSharp

Skill Codex

Review, modify, test, document, or release the DisCatSharp repository. Use for DisCatSharp source changes, API additions and migrations, Discord payload models, serialization, command synchronization, Gateway dispatch, REST behavior, analyzer work, multi-target testing, DocFX generation, release notes, and repository…

not rated 140 yesterday A 69 tokens

rsid-sdk

18

realsenseai/RealSenseID

Skill Claude CodeCodex

RealSenseID face authentication SDK reference. Use when writing code for face enrollment, authentication, host-mode faceprint extraction/matching, device configuration, user management, device discovery, camera preview, logging, or serial connection. Covers C++ (RealSenseID namespace), Python (rsidpy), and C# (rsid).

not rated 122 1mo ago A 70 tokens original Apache-2.0

tw-nuru

19

TimeWarpEngineering/timewarp-nuru

Skill Claude CodeCodex needs its repo

Build CLI applications with TimeWarp.Nuru - a .NET route-based CLI framework with web-style routing, source generators, and AOT support. Use when creating CLI tools, defining commands/queries, adding parameters or options, testing CLI output, or working with TimeWarp.Nuru.

not rated 121 changed 4d ago A SkillSpector: warn 61 tokens original Unlicense

ara3d-sdk

20

znlgis/opengis-skills

Skill Claude CodeCodex

Use when processing AEC/BIM 3D data in .NET 8 — mesh generation and transformation, SIMD-accelerated math, IFC/STEP/PLY to glTF/GLB/VIM conversion, plugin development. Ara3D-SDK: high-performance .NET 3D geometry and BIM library suite.

not rated 76 changed 9d ago A SkillSpector: warn 70 tokens original MIT

carquiza/RoslynMCP

MCP server Claude CodeCodexCursor +2

MCP server "roslyn-code-navigator" as configured in carquiza/RoslynMCP. Launched with dotnet run --project D:\Source\RoslynMCP\RoslynMcpServer. Needs 2 environment variables to run.

not rated 67 1y ago A tokens not measured

RudyCity/superagent

Skill Claude CodeCodex

Master C#/.NET backend development patterns for building robust APIs, MCP servers, and enterprise applications. Covers async/await, dependency injection, Entity Framework Core, Dapper, configuration, caching, and testing with xUnit. Use when developing .NET backends, reviewing C# code, or designing API architectures.

not rated 64 +3 today A SkillSpector: pass 70 tokens original MIT

workshop-testing

23

dotnet-presentations/ai-workshop

Skill Claude CodeCodex

Walk through the .NET AI Workshop as an attendee to validate that the READMEs, commands, and code snapshots still work. USE FOR: testing the workshop, testing a specific Part, dry-running the labs, verifying a README against its snapshot, reconciling or refreshing code snapshots, producing a workshop test report. DO…

not rated 62 +2 changed 1mo ago A SkillSpector: warn 95 tokens original MIT

syncfusion/maui-ui-components-skills

Skill Claude CodeCodex

Sets up and validates Syncfusion .NET MAUI licensing, including license key registration, generation, and error resolution. Use when encountering trial license warnings ("This application was built using a trial version"), licensing errors, license key registration, unlock key vs license key confusion, build server or…

not rated 61 10d ago A 83 tokens

At most 3 mods per repository are shown here, and a mod shipped inside a plugin is left to that plugin's page — the rest are on their repository pages: