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/kouroshez/coding-os/aspnet-corenpx skills add kouroshez/coding-os --skill aspnet-coregit clone --depth 1 https://github.com/kouroshez/coding-osWrote 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/kouroshez/coding-os/aspnet-core)<a href="https://agentmods.dev/skills/kouroshez/coding-os/aspnet-core"><img src="https://agentmods.dev/badge/skills/kouroshez/coding-os/aspnet-core.svg" alt="Measured on agentmods" 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 | $0.00099 | $0.00850 |
| Opus 5 | $0.00049 | $0.00425 |
| Sonnet 5 | $0.00020 | $0.00170 |
| Haiku 4.5 | $0.00010 | $0.00085 |
Grade A, and why
aspnet-core 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.
How it starts
The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.
REQUIRED BACKGROUND: You MUST also follow the core clean-code and
backend-fundamentals skills. This skill adds ASP.NET Core-specific patterns
on top.
aspnet-core
Layer contract (matches structure.tree)
| Layer | May import | Never |
|---|---|---|
*Endpoints.cs / controllers |
the feature service, DTOs | repositories, other endpoints |
*Service.cs |
repositories, other services | HttpContext, IHttpContextAccessor, transport types |
Repositories/ |
the DbContext / DB client |
services, endpoints |
Common/ (middleware/filters) |
services (for auth lookups) | repositories |
Services stay transport-free — no HttpContext — so they are unit-testable and
a transport swap (minimal API → controllers → gRPC) is an endpoint-layer-only
change.
DI & wiring
- Register every service in
Program.cs(AddScoped/AddSingleton/AddTransient); resolve by constructor or endpoint-parameter injection — nevernewa service. Program.csowns wiring only, not business logic. OneWebApplication, middleware pipeline registered once, feature endpoints mapped via<Feature>Endpoints.Map(app).- Lifetimes:
Scopedfor per-request (the default for services touching the DB),Singletononly for stateless/thread-safe helpers,Transientfor cheap stateless objects. A captive dependency (Singleton holding a Scoped) is a bug. - Keep
Programreachable to tests (public partial class Program;) soWebApplicationFactory<Program>can build the app without binding a port.
Endpoints (thin)
- A handler binds/validates the DTO → calls ONE service method → returns the value (the host serializes). Do not build the response envelope by hand.
- No try/catch for error shaping in an endpoint — throw a typed exception and let the global middleware shape it.
- Flow
CancellationTokenfrom the handler into every downstream call.
Validation
- Every body/route/query input is a validated DTO (DataAnnotations or FluentValidation); reject fail-closed before the service runs. The service receives a typed, validated value and never reads the raw request.
What ships with it
1 file 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 · 81 lines · 99 tokens per session scan A c25246a9d246
aspnet-core is a skill published in the GitHub repository kouroshez/coding-os (6 stars, last pushed 4d ago), licensed Apache-2.0. It adds 99 tokens to every session and 850 once invoked, about $0.0005 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 2026-09-03.
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