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 rules/willibrandon/netcontextserver/dotnetgit 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 | $0.00000 | $0.00606 |
| Opus 5 | $0.00000 | $0.00303 |
| Sonnet 5 | $0.00000 | $0.00121 |
| Haiku 4.5 | $0.00000 | $0.00061 |
Grade A, and why
dotnet 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 — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.
.NET Codebase Context MCP Server Development Rules
This rule applies to all .NET code files in the project and provides guidance for implementing the MCP server with specific optimizations for Claude 3.7 Sonnet integration.
Code Documentation for AI Assistance
- Include comprehensive XML documentation for all public and protected members
- Add code examples within XML comments for complex functionality
- Document "why" behind implementation decisions, not just "what" the code does
- Use consistent terminology across all documentation
- Include parameter validation logic in method documentation
- Specify explicit return value descriptions and possible exceptions
- Add class/interface relationship diagrams in code comments for complex hierarchies
Code Organization
- Keep files under 300 lines when possible for better AI comprehension
- Use partial classes to logically organize larger components
- Follow consistent naming conventions for related patterns
- Group related functionality into clearly named namespaces
- Create dedicated classes for cross-cutting concerns
- Use explicit rather than implicit patterns to improve AI code understanding
- Prefer composition over inheritance for better AI reasoning
Implementation Guidelines
- Prioritize readability over clever or overly compact code
- Implement one complete feature at a time
- Use strongly typed models for all data exchanges
- Create dedicated DTOs for MCP protocol interactions
- Add comprehensive input validation with descriptive error messages
- Implement self-explanatory function and variable names
- Avoid magic numbers and strings; use constants with descriptive names
Testing Guidelines
- Write unit tests for all public APIs with descriptive test names
- Create integration tests for MCP protocol interactions
- Add performance tests for critical path operations
- Include contract tests for MCP protocol compliance
- Cover edge cases and failure scenarios in tests
- Document test coverage goals and gaps
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 · 69 lines · 606 tokens per session scan A 1dc7f659790e
dotnet is a cursor rule published in the GitHub repository willibrandon/NetContextServer (32 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 606 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 2026-08-30.
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