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 skills/managedcode/prompterone/dotnet-microsoft-extensionsnpx skills add managedcode/PrompterOne --skill dotnet-microsoft-extensionsgit clone --depth 1 https://github.com/managedcode/PrompterOneWhat 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 | $0.00036 | $0.00390 |
| Opus 5 | $0.00018 | $0.00195 |
| Sonnet 5 | $0.00007 | $0.00078 |
| Haiku 4.5 | $0.00004 | $0.00039 |
Grade A, and why
dotnet-microsoft-extensions 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 2d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- dotnet-microsoft-extensions — 91% identical, 2 lines differ
What it actually says
Microsoft.Extensions for .NET
Trigger On
- wiring dependency injection, configuration, logging, or options
- introducing Generic Host patterns into non-web .NET apps
- cleaning up service registration, typed HTTP clients, or shared infrastructure code
Workflow
- Prefer the Generic Host for apps that need configuration, DI, logging, hosted services, or coordinated startup.
- Keep service registration predictable: composition at the edge, concrete implementations hidden behind interfaces only where that abstraction buys flexibility.
- Use options binding for structured configuration and validate configuration at startup when bad settings would fail later at runtime.
- Prefer
IHttpClientFactoryand typed or named clients for outbound HTTP instead of ad-hoc singleton or per-callHttpClientusage. - Use logging categories and config-driven log levels rather than scattered ad-hoc logging behavior.
- Avoid building mini-frameworks over Microsoft.Extensions unless the repo genuinely needs reusable composition primitives.
Deliver
- clean host wiring and service registration
- configuration and logging that are observable and testable
- infrastructure code that fits naturally with the .NET stack
Validate
- service lifetimes are correct
- configuration is strongly typed where it matters
- host setup remains easy to debug and reason about
References
- patterns.md - DI patterns, Configuration patterns, Options pattern, Logging patterns, HttpClientFactory patterns, Hosted Service patterns
- anti-patterns.md - Common mistakes with DI, configuration, options, logging, HttpClient, and hosted services
What ships with it
3 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.
- 2d ago First seen · 40 lines · 36 tokens per session scan A a18f8b53ae2e
dotnet-microsoft-extensions is a skill published in the GitHub repository managedcode/PrompterOne (42 stars, last pushed 3mo ago), licensed MIT. It adds 36 tokens to every session and 390 once invoked, about $0.0002 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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