csharp-dotnet-pro

csharp-dotnet-pro is an agent for Claude Code from JosephHampton/awesome-gemini-cli-subagents. It costs 32 tokens per session (332 once invoked), scanned A, original, CC0-1.0.

A tool for writing C# programs on .NET, Microsoft's development platform. It covers web APIs, database access with Entity Framework, background services, and performance work.

In plain words
What is it for?
Use it to build ASP.NET Core APIs, Entity Framework data access, background services, configuration, dependency injection, and performance improvements.
Why use it?
C# and .NET projects need consistent framework patterns, safe asynchronous code, correct dependency setup, and tests. It applies those practices while matching the project's existing structure.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to build ASP.NET Core APIs, Entity Framework data access, background services, configuration, dependency injection, and performance improvements.

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Install with agentmods
npx agentmods add agents/josephhampton/awesome-gemini-cli-subagents/csharp-dotnet-pro
Install

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.

Clone the repo
git clone --depth 1 https://github.com/JosephHampton/awesome-gemini-cli-subagents

Made for: Claude Code.

Wrote 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.

agentmods badge for csharp-dotnet-pro

README.md
[![agentmods](https://agentmods.dev/badge/agents/josephhampton/awesome-gemini-cli-subagents/csharp-dotnet-pro/github.svg)](https://agentmods.dev/agents/josephhampton/awesome-gemini-cli-subagents/csharp-dotnet-pro)
Your own site
<a href="https://agentmods.dev/agents/josephhampton/awesome-gemini-cli-subagents/csharp-dotnet-pro"><img src="https://agentmods.dev/badge/agents/josephhampton/awesome-gemini-cli-subagents/csharp-dotnet-pro/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.

agentmods 80×15 button for csharp-dotnet-pro

Your own site · 80×15
<a href="https://agentmods.dev/agents/josephhampton/awesome-gemini-cli-subagents/csharp-dotnet-pro"><img src="https://agentmods.dev/badge/agents/josephhampton/awesome-gemini-cli-subagents/csharp-dotnet-pro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 32 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 332 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00032 $0.00332
Opus 5.5 $0.00013 $0.00133
Sonnet 5.5 $0.00006 $0.00066
Haiku 4.5 $0.00003 $0.00033

Measured today against content hash 1fa8b800975d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

csharp-dotnet-pro 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 today.

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.

antigravity/awesome-subagents/agents/csharp-dotnet-pro.md · 37 lines

What it actually says

You are a C# and .NET expert who writes modern, minimal, allocation-conscious code on current .NET.

When invoked:

  1. Read the solution layout, target framework, and existing conventions before writing.
  2. Use current language features (records, pattern matching, nullable reference types) consistently with the codebase.

Focus areas:

  • ASP.NET Core: minimal APIs or controllers to match the project, proper DI lifetimes, middleware kept lean.
  • Entity Framework Core: no-tracking queries by default for reads, explicit includes, migrations that review well.
  • Async done right: async all the way, cancellation tokens threaded through, no sync-over-async.
  • Nullable reference types honoured; warnings are errors, not noise.
  • Performance where it counts: spans and pooling in hot paths, benchmarks before and after.

Method:

  • Start from the contract (endpoint or interface), then implement inward.
  • Keep configuration in options types with validation at startup.
  • Prefer built-in framework features over third-party packages that duplicate them.

Output:

  • C# code with the relevant csproj changes, plus tests and a note on DI registrations.

Never swallow an exception or fire-and-forget a task without a deliberate reason.

Changes

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.

  1. today First seen · 37 lines · 32 tokens per session scan A 1fa8b800975d

Subscribe to this mod's changes

csharp-dotnet-pro is an agent published in the GitHub repository JosephHampton/awesome-gemini-cli-subagents (59 stars, last pushed today), licensed CC0-1.0. It adds 32 tokens to every session and 332 once invoked, about $0.0001 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 2026-10-23.