Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add jnPiyush/AgentX --skill csharpgit clone --depth 1 https://github.com/jnPiyush/AgentXWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/jnpiyush/agentx/csharp)<a href="https://agentmods.dev/skills/jnpiyush/agentx/csharp"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/csharp/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/jnpiyush/agentx/csharp"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/csharp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00050 | $0.01598 |
| Opus 5.5 | $0.00020 | $0.00639 |
| Sonnet 5.5 | $0.00010 | $0.00320 |
| Haiku 4.5 | $0.00005 | $0.00160 |
Grade A, and why
csharp scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 174 lines — stays where its author put it; the contents beside it link to each section on GitHub.
C# / .NET Development
Purpose: Production-ready C# and .NET development standards for building secure, performant, maintainable applications. Audience: Engineers building .NET applications with C#, ASP.NET Core, Entity Framework Core. Standard: Follows github/awesome-copilot .NET development patterns.
When to Use This Skill
- Building .NET applications with C#
- Writing async/await code patterns
- Using Entity Framework Core for data access
- Implementing dependency injection
- Configuring nullable reference types
Decision Tree
C# Project Decision
+-- Building a web API?
| +-- REST API? -> ASP.NET Core Minimal API or Controllers
| +-- gRPC service? -> ASP.NET Core gRPC
+-- Data access needed?
| +-- Relational DB? -> Entity Framework Core
| +-- NoSQL / document? -> Azure Cosmos DB SDK
| +-- Simple queries? -> Dapper
+-- Background processing?
| +-- Scheduled jobs? -> IHostedService / BackgroundService
| +-- Message-driven? -> Azure Service Bus + Worker Service
+-- Desktop / cross-platform UI?
| +-- Cross-platform? -> .NET MAUI
| +-- Windows only? -> WPF or WinForms
+-- Library / shared code? -> .NET Class Library with NuGet packaging
Prerequisites
- .NET 8+ SDK installed
- C# 12+ language features
- IDE with C# support
Quick Reference
| Need | Solution | Pattern |
|---|---|---|
| Async code | Use async/await everywhere |
async Task<T> GetDataAsync() |
| Null safety | Enable nullable reference types | <Nullable>enable</Nullable> |
| Error handling | Use Result types or exceptions | try-catch with specific types |
| DI | Constructor injection with interfaces | IServiceCollection |
| Testing | xUnit, NUnit, or TUnit | [Fact], [Test] |
| Logging | ILogger<T> with structured logging |
_logger.LogInformation("User {UserId}", id) |
C# Language Version
Current: C# 14 (.NET 10+) Minimum: C# 8 (.NET Core 3.1+)
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago Changed 9ca724f3bc7a
- 1mo ago First seen · 174 lines · 50 tokens per session scan A 2501b00478f1
csharp is a skill published in the GitHub repository jnPiyush/AgentX (16 stars, last pushed 3d ago), licensed Apache-2.0. It adds 50 tokens to every session and 1,598 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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