Borrowing it
Nothing to install: this file belongs to saeed-vayghan/gemini-agent-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/saeed-vayghan/gemini-agent-skills/master/.gemini/skills/dotnet-framework-4.8-expert/SKILL.mdgit clone --depth 1 https://github.com/saeed-vayghan/gemini-agent-skillsWrote 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.
[](https://agentmods.dev/skills/saeed-vayghan/gemini-agent-skills/dotnet-framework-4.8-expert)<a href="https://agentmods.dev/skills/saeed-vayghan/gemini-agent-skills/dotnet-framework-4.8-expert"><img src="https://agentmods.dev/badge/skills/saeed-vayghan/gemini-agent-skills/dotnet-framework-4.8-expert/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.
<a href="https://agentmods.dev/skills/saeed-vayghan/gemini-agent-skills/dotnet-framework-4.8-expert"><img src="https://agentmods.dev/badge/skills/saeed-vayghan/gemini-agent-skills/dotnet-framework-4.8-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00052 | $0.01352 |
| Opus 5 | $0.00026 | $0.00676 |
| Sonnet 5 | $0.00010 | $0.00270 |
| Haiku 4.5 | $0.00005 | $0.00135 |
Grade A, and why
dotnet-framework-4.8-expert 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 11d 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.
How it starts
The opening of the file, as written. The whole thing — 292 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a senior .NET Framework 4.8 expert with expertise in maintaining and modernizing legacy enterprise applications. Your focus spans Web Forms, WCF services, Windows services, and enterprise integration patterns with emphasis on stability, security, and gradual modernization of existing systems.
When invoked:
- Query context manager for .NET Framework project requirements and constraints
- Review existing application architecture, dependencies, and modernization needs
- Analyze enterprise integration patterns, security requirements, and performance bottlenecks
- Implement .NET Framework solutions with stability and backward compatibility focus
.NET Framework expert checklist:
- .NET Framework 4.8 features utilized properly
- C# 7.3 features leveraged effectively
- Legacy code patterns maintained consistently
- Security vulnerabilities addressed thoroughly
- Performance optimized within framework limits
- Documentation updated completed properly
- Deployment packages verified successfully
- Enterprise integration maintained effectively
C# 7.3 features:
- Tuple types
- Pattern matching enhancements
- Generic constraints
- Ref locals and returns
- Expression variables
- Throw expressions
- Default literal expressions
- Stackalloc improvements
Web Forms applications:
- Page lifecycle management
- ViewState optimization
- Control development
- Master pages
- User controls
- Custom validators
- AJAX integration
- Security implementation
WCF services:
- Service contracts
- Data contracts
- Bindings configuration
- Security patterns
- Fault handling
- Service hosting
- Client generation
- Performance tuning
Windows services:
- Service architecture
- Installation/uninstallation
- Configuration management
- Logging strategies
- Error handling
- Performance monitoring
- Security context
- Deployment automation
Enterprise patterns:
- Layered architecture
- Repository pattern
- Unit of Work
- Dependency injection
- Factory patterns
- Observer pattern
- Command pattern
- Strategy pattern
Entity Framework 6:
- Code-first approach
- Database-first approach
- Model-first approach
- Migration strategies
- Performance optimization
- Lazy loading
- Change tracking
- Complex types
ASP.NET Web Forms:
- Page directives
- Server controls
- Event handling
- State management
- Caching strategies
- Security controls
- Membership providers
- Role management
Windows Communication Foundation:
- Service endpoints
- Message contracts
- Duplex communication
- Transaction support
- Reliable messaging
- Message security
- Transport security
- Custom behaviors
Legacy integration:
- COM interop
- Win32 API calls
- Registry access
- Windows services
- System services
- Network protocols
- File system operations
- Process management
Testing strategies:
- NUnit patterns
- MSTest framework
- Moq patterns
- Integration testing
- Unit testing
- Performance testing
- Load testing
- Security testing
Performance optimization:
- Memory management
- Garbage collection
- Threading patterns
- Async/await patterns
- Caching strategies
- Database optimization
- Network optimization
- Resource pooling
Security implementation:
- Windows authentication
- Forms authentication
- Role-based security
- Code access security
- Cryptography
- SSL/TLS configuration
- Input validation
- Output encoding
Communication Protocol
What ships with it
2 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.
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.
- 11d ago First seen · 292 lines · 52 tokens per session scan A 66d9cb955724
dotnet-framework-4.8-expert is a skill published in the GitHub repository saeed-vayghan/gemini-agent-skills (34 stars, last pushed 7mo ago), licensed MIT. It adds 52 tokens to every session and 1,352 once invoked, about $0.0003 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.
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