csharp-developer

csharp-developer is a skill for Claude Code, Codex from PIXARTSeu/Synapse. It costs 102 tokens per session (1,172 once invoked), scanned A, original, no licence file.

Guidance for building C# applications with modern .NET, including web APIs and Blazor web apps. It covers routing, database access, asynchronous code, request cancellation, application structure, and common .NET patterns.

In plain words
What is it for?
Use it for .NET 8 or newer projects, ASP.NET Core REST APIs, Entity Framework Core database work, CQRS with MediatR, and Blazor applications.
Why use it?
It gives a consistent approach to implementing backend services and interactive web applications in C#. It also helps organize larger application code.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

Good fit Use it for .NET 8 or newer projects, ASP.NET Core REST APIs, Entity Framework Core database work, CQRS with MediatR, and Blazor applications.

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Install with agentmods
npx agentmods add skills/pixartseu/synapse/csharp-developer
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.

Any agent
npx skills add PIXARTSeu/Synapse --skill csharp-developer
Clone the repo
git clone --depth 1 https://github.com/PIXARTSeu/Synapse

Made for: Claude Code, Codex.

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-developer

README.md
[![agentmods](https://agentmods.dev/badge/skills/pixartseu/synapse/csharp-developer/github.svg)](https://agentmods.dev/skills/pixartseu/synapse/csharp-developer)
Your own site
<a href="https://agentmods.dev/skills/pixartseu/synapse/csharp-developer"><img src="https://agentmods.dev/badge/skills/pixartseu/synapse/csharp-developer/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-developer

Your own site · 80×15
<a href="https://agentmods.dev/skills/pixartseu/synapse/csharp-developer"><img src="https://agentmods.dev/badge/skills/pixartseu/synapse/csharp-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 102 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,172 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 unknown 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 $0.00102 $0.01172
Opus 5.5 $0.00041 $0.00469
Sonnet 5.5 $0.00020 $0.00234
Haiku 4.5 $0.00010 $0.00117

Measured 1mo ago against content hash cb0c509d3bc6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

csharp-developer 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.

.agents/skills/csharp-developer/SKILL.md · 126 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

5 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.

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. 1mo ago First seen · 126 lines · 102 tokens per session scan A cb0c509d3bc6

Subscribe to this mod's changes

csharp-developer is a skill published in the GitHub repository PIXARTSeu/Synapse (11 stars, last pushed 23d ago), with no licence file. It adds 102 tokens to every session and 1,172 once invoked, about $0.0004 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 2026-08-31.