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 instructions/willibrandon/netcontextserver/claude-mdgit clone --depth 1 https://github.com/willibrandon/NetContextServerWhat 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 | $0.00776 | $0.00776 |
| Opus 5 | $0.00388 | $0.00388 |
| Sonnet 5 | $0.00155 | $0.00155 |
| Haiku 4.5 | $0.00078 | $0.00078 |
Grade A, and why
NetContextServer CLAUDE.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 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 — 97 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Project Overview
NetContextServer is a .NET 9.0 Model Context Protocol (MCP) server that provides AI coding assistants with deep understanding of .NET codebases. It consists of three main projects:
NetContextServer: MCP server implementationNetContextClient: CLI interface for server interactionNetContextServer.Tests: Comprehensive test suite
Essential Commands
Development
# Build the solution
dotnet build
# Run tests
dotnet test
# Run the server
dotnet run --project src/NetContextServer/NetContextServer.csproj
# Run the client with a command
dotnet run --project src/NetContextClient/NetContextClient.csproj -- [command]
# Run a specific test
dotnet test --filter "FullyQualifiedName~TestName"
# Run tests with coverage
dotnet test --collect:"XPlat Code Coverage"
Publishing
# Publish for Windows
dotnet publish -c Release -r win-x64 --self-contained
# Publish for Linux
dotnet publish -c Release -r linux-x64 --self-contained
# Publish for macOS
dotnet publish -c Release -r osx-x64 --self-contained
Architecture Overview
Service Layer Pattern
The codebase follows a clean service-based architecture where business logic is encapsulated in services under src/NetContextServer/Services/. Each service has a corresponding interface and handles a specific domain concern.
MCP Tool Implementation
Tools are organized under src/NetContextServer/Tools/ and grouped by functionality:
- FileTools: Project/file operations (
ListProjects,ListSourceFiles,ReadFile) - SearchTools: Text and semantic search (
SearchCode,SemanticSearch) - PackageTools: NuGet package analysis (
AnalyzePackages) - CoverageTools: Test coverage analysis (
GetCoverage) - ThinkTools: Structured reasoning (
Think)
Each tool class inherits from ModelContextTool<TArgs, TResult> and implements the MCP protocol.
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 · 97 lines · 776 tokens per session scan A a0b0b2ae7e35
NetContextServer CLAUDE.md is an instructions file published in the GitHub repository willibrandon/NetContextServer (32 stars, last pushed 1y ago), licensed MIT. It adds 776 tokens to every session, about $0.0039 per session on Opus 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.
Other instructions, from other repositories
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
buildNext
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
spec-kit AGENTS.md
Instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
langchain AGENTS.md
Instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.