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Generate wrapper interfaces and DI registration for hard-to-test static dependencies in C#, when the abstraction does NOT exist yet. Produces IFileSystem, IEnvironmentProvider, IConsole, IProcessRunner wrappers, or guides first-time adoption of TimeProvider and IHttpClientFactory and registering them in DI. USE FOR: generate wrapper for static, create IFileSystem wrapper, wrap DateTime.Now, make static testable, make class testable, create abstraction for File.*, generate DI registration, set up
Passed 20 of 23 test cases with the skill, and 17 of 23 without it.
and 3 more in the full report
4 fixed16 passed either way2 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
Our background service reads Environment.MachineName and Environment.GetEnvironmentVariable("APP_ENV"). Generate the custom C# interface, implementation class under namespace App.Core, and the Microsoft DI registration line.
| Checked | Without skill | With skill |
|---|---|---|
| Defines an interface containing only MachineName and GetEnvironmentVariable members. | Missed | Passed |
| Registers the environment wrapper with AddSingleton in Microsoft DI. | Passed | Passed |
The instructions your model reads when the skill loads.
Generate wrapper interfaces, default implementations, and DI service registration code for untestable static dependencies. For statics that already have .NET built-in abstractions (TimeProvider, IHttpClientFactory), guide adoption of the built-in. For statics without built-in alternatives, generate custom minimal wrappers.
detect-static-dependencies and identifying which statics to wrapTimeProvider (.NET 8+) or System.IO.AbstractionsEnvironment.*, Console.*, or Process.*detect-static-dependencies)migrate-static-to-wrapper)| Input | Required | Description |
|---|---|---|
| Static category | Yes | Which category: time, filesystem, environment, network, console, process |
| Target framework | Yes | The TargetFramework from .csproj (affects which built-in abstractions exist) |
| DI container | No | Which DI framework: microsoft (default), autofac, none (ambient context) |
| Namespace | No | Target namespace for generated wrapper code |
Based on the category and target framework:
| Category | .NET 8+ | .NET 6-7 | .NET Framework |
|---|---|---|---|
| Time | TimeProvider (built-in) | TimeProvider via Microsoft.Bcl.TimeProvider NuGet | Custom ISystemClock |
| File system | System.IO.Abstractions (NuGet) | Same | Same |
| HTTP | IHttpClientFactory (built-in) | Same | Same |
| Environment | Custom IEnvironmentProvider | Same | Same |
| Console | Custom IConsole | Same | Same |
test cases passed, vs 17 / 23 without
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