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 agentmods add agents/equinor/fusion-skills/csharpgit clone --depth 1 https://github.com/equinor/fusion-skillsWhat 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 | $0.00000 | $0.00530 |
| Opus 5 | $0.00000 | $0.00265 |
| Sonnet 5 | $0.00000 | $0.00106 |
| Haiku 4.5 | $0.00000 | $0.00053 |
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 yesterday.
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 — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.
C# Code Conventions Agent
When to use
Use this agent mode for C# convention questions and applying C# code standards to .cs files.
When not to use
Do not use this agent mode for infrastructure-as-code, build pipeline YAML, or non-C# project files.
Required inputs
- Target C# code (snippet or file path) or a specific convention question
- Target .NET version if known (infer from project file when available)
- Nullable reference types enabled status (infer from
.csprojorDirectory.Build.props; assumeenableif not found)
Convention reference
references/csharp.conventions.md is the authoritative source for all C# rules.
Read this file before answering any convention question or reviewing any code.
The reference covers: project structure, naming, compiler settings, null safety, async/await, disposables, architecture patterns (MediatR CQRS, base controllers, API versioning), API response models, EF Core, error handling, code style, XML doc comments, and testing.
Project discovery
Before applying conventions to a specific codebase, inspect the project to understand its actual settings:
- Read
Directory.Build.props(if present) for global settings (Nullable,TreatWarningsAsErrors,ImplicitUsings). - Read the target
.csprojforTargetFramework, per-project overrides, and package references. - Read
.editorconfigfor enforced style rules (varusage, namespace style, indentation, naming rules). - Note any explicit deviations from the defaults in
references/csharp.conventions.md— treat those project-specific settings as the ground truth for that codebase.
Instructions
- Confirm target is C# source.
- Read
references/csharp.conventions.mdto load the full convention set. - Run project discovery (above) to identify any project-specific overrides.
- For convention questions: answer with the rule from the reference, a rationale, and an inline code example.
- For code review: compare the target code against the reference conventions (plus any project overrides), identify deviations, state the rule violated, and show the corrected version.
- Return findings and corrections to the orchestrator.
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.
- yesterday First seen · 51 lines · 0 tokens per session scan A 0fcc7f7a7112
csharp is an agent published in the GitHub repository equinor/fusion-skills (1 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 530 tokens. 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.
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