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MCP-Plugin-dotnet: Instructions file for GitHub Copilot

.github/copilot-instructions.md

MCP-Plugin-dotnet copilot-instructions.md is an instructions file for GitHub Copilot from IvanMurzak/MCP-Plugin-dotnet. It costs 604 tokens per session, scanned A, original, Apache-2.0.

Repository instructions for an MCP plugin written in C#, covering naming, formatting, architecture, logging, testing, and project-specific libraries. MCP is a standard for exposing tools and resources to AI agents.

In plain words
What is it for?
Use them when modifying the plugin library, its ASP.NET Core server integration, shared utilities, or related tests.
Why use it?
They keep contributions consistent with the project's unusual conventions and its expected server integration patterns.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file.

This is IvanMurzak/MCP-Plugin-dotnet's own configuration. It tells GitHub Copilot how to work on MCP-Plugin-dotnet itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything MCP-Plugin-dotnet configures →

not rated 20repo today A scan 604 tokens original Apache-2.0
View source ↗ IvanMurzak/MCP-Plugin-dotnet
Reuse

Borrowing it

Nothing to install: this file belongs to IvanMurzak/MCP-Plugin-dotnet. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/IvanMurzak/MCP-Plugin-dotnet/main/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/IvanMurzak/MCP-Plugin-dotnet

Made for: GitHub Copilot.

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 MCP-Plugin-dotnet copilot-instructions.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/ivanmurzak/mcp-plugin-dotnet/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/ivanmurzak/mcp-plugin-dotnet/copilot-instructions/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 MCP-Plugin-dotnet copilot-instructions.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/ivanmurzak/mcp-plugin-dotnet/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/ivanmurzak/mcp-plugin-dotnet/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 604 This file is loaded in full into every session.
When invoked 604 The same file — it is already loaded in full.
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 $0.00604 $0.00604
Opus 5.5 $0.00242 $0.00242
Sonnet 5.5 $0.00121 $0.00121
Haiku 4.5 $0.00060 $0.00060

Measured 1mo ago against content hash a82a16a545ae, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

MCP-Plugin-dotnet copilot-instructions.md 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.

.github/copilot-instructions.md · 47 lines

How it starts

The opening of the file, as written. The whole thing — 47 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Project Guidelines

Code Style

  • Namespaces: Use Java-style reverse domain namespaces (e.g., com.IvanMurzak.McpPlugin). This is mandatory and overrides standard C# conventions.
  • File Headers: ALL C# files MUST start with the specific ASCII art header containing author, repo, and license info. Copy an existing header exactly.
  • Formatting:
    • Use Allman style (braces on new lines).
    • _camelCase for private fields.
    • PascalCase for public members.
  • Reactive Programming: Prefer R3 (Reactive Extensions) for event handling (Subject<Unit>, Observable<T>).
  • Data Inspection: Use com.IvanMurzak.ReflectorNet for runtime metadata inspection over standard Reflection where applicable.
  • Logging: Use Microsoft.Extensions.Configuration abstractions backed by NLog.

Architecture

  • Core Library (McpPlugin): Implements McpToolManager, McpResourceManager, McpPromptManager.
  • Server Integration (McpPlugin.Server): ASP.NET Core integration.
    • Register: builder.Services.WithMcpServer(...)
    • Middleware: app.UseMcpPluginServer(...)
  • Common (McpPlugin.Common): Shared utilities like IDisposableAsync and Version info.
  • Transports: Supports stdio (local process) and streamableHttp (SSE/HTTP).

Build and Test

  • Build: dotnet build McpPlugin.sln
  • Test: dotnet test (Runs McpPlugin.Tests and McpPlugin.Server.Tests)
    • Testing uses xUnit, Shouldly, and Moq.
  • Automation: Check commands/ for PowerShell scripts (e.g., bump-version.ps1, update-reflectornet.ps1).

Project Conventions

  • CLI Arguments: Use DataArguments class for parsing command-line arguments and transport settings, not just IConfiguration.
  • Disposal: Implement IDisposableAsync for asynchronous cleanup resources.
  • Attributes: Heavy use of attributes for tool definitions (from ReflectorNet or internal MCP attributes).

Integration Points

  • ASP.NET Core: See DemoWebApp for reference implementation. Use IDependencyInjection to resolve services.
  • Console Apps: See DemoConsoleApp for stdio transport examples.
  • SignalR: Used internally in McpPlugin.Server for some communication aspects.

Read the full file on GitHub · 47 lines

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 · 47 lines · 604 tokens per session scan A a82a16a545ae

Subscribe to this mod's changes

MCP-Plugin-dotnet copilot-instructions.md is an instructions file published in the GitHub repository IvanMurzak/MCP-Plugin-dotnet (20 stars, last pushed today), licensed Apache-2.0. It adds 604 tokens to every session, about $0.0024 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 2026-08-30.

LLMaidotnethttp-mcpmcpmodel-context-protocol
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