Adding web api skill and tests

[sayedihashimi]

Adds the dotnet-webapi skill to the dotnet-aspnet plugin. This skill guides the creation and modification of ASP.NET Core Web API endpoints with correct HTTP semantics, OpenAPI metadata, and error handling.

I'm running the skill validator now and I will add the results as a comment when it completes.

This PR replaces the closed PR #493

What's included

New skill: plugins/dotnet-aspnet/skills/dotnet-webapi/SKILL.md

A comprehensive skill covering the following areas:

• API style detection — Scans existing projects to determine whether to use controllers or minimal APIs; defaults to minimal APIs for new projects and never mixes styles.
• Request/response types — Enforces sealed record DTOs with proper naming conventions (CreateXxxRequest, XxxResponse), XML doc comments, and DateTimeOffset for timestamps.
• Minimal API endpoints — Guides use of TypedResults with explicit Results<T1, T2> return types, CancellationToken forwarding, and OpenAPI endpoint metadata (WithName, WithSummary, WithDescription).
• Controller-based endpoints — Follows [ApiController] conventions with ActionResult<T> return types and ProducesResponseType attributes.
• HTTP semantics — Ensures correct status codes (201 Created with Location header for POST, 204 No Content for DELETE, etc.).
• OpenAPI/Swagger — Uses the built-in .NET 9+ AddOpenApi()/MapOpenApi() instead of Swashbuckle; includes XML doc comment integration and JsonStringEnumConverter for enum serialization.
• Error handling — Implements IExceptionHandler with RFC 7807 ProblemDetails, exception-to-status-code mapping, and a sealed handler class in a Middleware/ folder.
• .http test files — Generates test files for verifying endpoints directly from the IDE.

@mikekistler @BrennanConroy

[Copilot]

Pull request overview

Adds a new dotnet-webapi skill under the dotnet-aspnet plugin, along with evaluation scenarios to validate endpoint creation guidance (minimal APIs vs controllers), OpenAPI wiring, and centralized error handling.

Changes:

• Added dotnet-webapi skill documentation covering API style detection, DTO conventions, OpenAPI configuration, and global error handling.
• Added dotnet-webapi eval test suite with three scenarios targeting minimal APIs, ProblemDetails-based exception handling, and controller-based extensions.

Show a summary per file

File	Description
plugins/dotnet-aspnet/skills/dotnet-webapi/SKILL.md	New skill definition and guidance for ASP.NET Core Web API endpoint creation, OpenAPI metadata, DTOs, and error handling.
tests/dotnet-aspnet/dotnet-webapi/eval.yaml	New skill-validator evaluation scenarios and rubrics for the dotnet-webapi skill.

Copilot's findings

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• Files reviewed: 2/2 changed files
• Comments generated: 2

[sayedihashimi]

skill validator results

dotnet run --project .\eng\skill-validator\src\SkillValidator.csproj -p:RunArguments="" -- evaluate --runs 5 --results-dir "C:\temp\skills\validator-output\" --tests-dir "./tests/dotnet-aspnet/" "./plugins/dotnet-aspnet/skills/dotnet-webapi"
Using model: claude-opus-4.6, judge-mode: Pairwise
Found 1 skill(s)

[dotnet-webapi] 🔍 Evaluating...
[dotnet-webapi] 🔍 Running overfitting check (parallel)...
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics] 📋 Starting scenario
[dotnet-webapi/Add error handling with ProblemDetails and IExceptionHandler] 📋 Starting scenario
[dotnet-webapi/Add a new API endpoint to an existing controller-based project] 📋 Starting scenario
[dotnet-webapi/Add a new API endpoint to an existing controller-based project/2] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Add a new API endpoint to an existing controller-based project/2] 🔌 Skill activated (plugin): skills=dotnet-webapi
[dotnet-webapi/Add a new API endpoint to an existing controller-based project/3] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Add a new API endpoint to an existing controller-based project/3] 🔌 Skill activated (plugin): skills=dotnet-webapi
[dotnet-webapi/Add error handling with ProblemDetails and IExceptionHandler/1] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Add error handling with ProblemDetails and IExceptionHandler/1] 🔌 Skill activated (plugin): skills=dotnet-webapi
[dotnet-webapi/Add error handling with ProblemDetails and IExceptionHandler/2] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Add error handling with ProblemDetails and IExceptionHandler/2] 🔌 Skill activated (plugin): skills=dotnet-webapi
⠋ Evaluating 1 target(s)...      ⚠️  Judge for "Add a new API endpoint to an existing controller-based project": attempt 1 failed: Judge response contained no JSON. Raw response:
Based on my analysis of the session timeline and the file character counts, I can evaluate the agent's work against each rubric criterion. The key evide
      🔄 Judge for "Add a new API endpoint to an existing controller-based project": retry 1/2 (waiting 4s)
⠙ Evaluating 1 target(s)...      ⚠️  Judge for "Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics": attempt 1 failed: The given key was not present in the dictionary.
      🔄 Judge for "Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics": retry 1/2 (waiting 4s)
[dotnet-webapi/Add error handling with ProblemDetails and IExceptionHandler/3] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Add error handling with ProblemDetails and IExceptionHandler/3] 🔌 Skill activated (plugin): skills=dotnet-webapi
⠧ Evaluating 1 target(s)...      ⚠️  Judge for "Add a new API endpoint to an existing controller-based project": attempt 2 failed: Judge response contained no JSON. Raw response:
Based on the session timeline, I can analyze the agent's work. The files are no longer accessible on disk, but I can reconstruct the content from the se
      🔄 Judge for "Add a new API endpoint to an existing controller-based project": retry 2/2 (waiting 9s)
⠋ Evaluating 1 target(s)...      ⚠️  Judge for "Add a new API endpoint to an existing controller-based project": attempt 1 failed: Judge response contained no JSON. Raw response:
Based on the session timeline, I can reconstruct the file contents from the truncated `file_text` parameters and their exact character counts. Let me ev
      🔄 Judge for "Add a new API endpoint to an existing controller-based project": retry 1/2 (waiting 4s)
⠧ Evaluating 1 target(s)...      ⚠️  Judge for "Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics": attempt 2 failed: The given key was not present in the dictionary.
      🔄 Judge for "Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics": retry 2/2 (waiting 8s)
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics/1] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics/1] 🔌 Skill activated (plugin): skills=dotnet-webapi
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics/3] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics/3] 🔌 Skill activated (plugin): skills=dotnet-webapi
⠋ Evaluating 1 target(s)...      ⚠️  Judge for "Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics": attempt 3 failed: Execution failed: CAPIError: 400 400 Bad Request
 (Request ID: FECE:20260E:FDEDA0:116D179:69E682B6)
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics/2] ⚠️  Judge (isolated) failed, using fallback scores: Judge for "Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics": all attempts failed after 211s: Execution failed: CAPIError: …
⠙ Evaluating 1 target(s)...      ⚠️  Judge for "Add a new API endpoint to an existing controller-based project": attempt 3 failed: Judge response contained no JSON. Raw response:
Based on the session timeline, I can analyze the agent's work even though I can't access the files directly. Let me reconstruct the file contents from t
[dotnet-webapi/Add a new API endpoint to an existing controller-based project/1] ⚠️  Judge (baseline) failed, using fallback scores: Judge for "Add a new API endpoint to an existing controller-based project": all attempts failed after 300s: Judge response contained no JSON. Raw resp…
[dotnet-webapi/Add error handling with ProblemDetails and IExceptionHandler/5] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Add error handling with ProblemDetails and IExceptionHandler/5] 🔌 Skill activated (plugin): skills=dotnet-webapi
⠴ Evaluating 1 target(s)...      ⚠️  Pairwise judge (reverse) for "Add a new API endpoint to an existing controller-based project": attempt 1 failed: Pairwise judge response contained no JSON (reverse)
      🔄 Pairwise judge (reverse) for "Add a new API endpoint to an existing controller-based project": retry 1/2 (waiting 4s)
[dotnet-webapi/Add error handling with ProblemDetails and IExceptionHandler/4] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Add error handling with ProblemDetails and IExceptionHandler/4] 🔌 Skill activated (plugin): skills=dotnet-webapi
[dotnet-webapi/Add error handling with ProblemDetails and IExceptionHandler] ✓ All 5 run(s) complete
[dotnet-webapi/Add a new API endpoint to an existing controller-based project/1] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Add a new API endpoint to an existing controller-based project/1] 🔌 Skill activated (plugin): skills=dotnet-webapi
[dotnet-webapi/Add a new API endpoint to an existing controller-based project/5] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Add a new API endpoint to an existing controller-based project/5] 🔌 Skill activated (plugin): skills=dotnet-webapi
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics/2] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics/2] 🔌 Skill activated (plugin): skills=dotnet-webapi
[dotnet-webapi/Add a new API endpoint to an existing controller-based project/4] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Add a new API endpoint to an existing controller-based project/4] 🔌 Skill activated (plugin): skills=dotnet-webapi
[dotnet-webapi/Add a new API endpoint to an existing controller-based project] ✓ All 5 run(s) complete
⠸ Evaluating 1 target(s)...      ⚠️  Judge for "Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics": attempt 1 failed: The given key was not present in the dictionary.
      🔄 Judge for "Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics": retry 1/2 (waiting 5s)
⠦ Evaluating 1 target(s)...      ⚠️  Judge for "Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics": attempt 1 failed: Judge response contained no JSON. Raw response:
The workspace environment is no longer accessible. I'll evaluate based on the detailed session timeline, including the truncated file creation parameter
      🔄 Judge for "Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics": retry 1/2 (waiting 3s)
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics/4] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics/4] 🔌 Skill activated (plugin): skills=dotnet-webapi
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics/5] 🔌 Skill activated (isolated): skills=dotnet-webapi
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics/5] 🔌 Skill activated (plugin): skills=dotnet-webapi
[dotnet-webapi/Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics] ✓ All 5 run(s) complete
[dotnet-webapi] 🔍 Overfitting: 0.28 (Moderate)
[dotnet-webapi] ✅ Done (score: 26.1%)
{Ansi.ClearLine}arget(s)...
═══ Skill Validation Results ═══

✓ dotnet-webapi  +26.1%  [+19.0%, +42.1%] significant  (g=+51.8%)
  Improvement score 26.1% meets threshold of 10.0% [high variance in: Add error handling with ProblemDetails and IExceptionHandler]

  🔍 Overfitting: 0.28 (moderate) 🟡
    • [vocabulary] "Exception handler is placed in a Middleware/ folder"
      — This is purely a skill-specific organizational preference. 'Handlers/', 'ExceptionHandlers/', 'Infrastructure/', or the project root are equally valid. A knowledgeable developer would not be expected to use this exact folder name.
    • [technique] "Exception handler class is sealed"
      — The 'sealed' modifier on the exception handler is a skill-specific convention. An unsealed class is functionally identical. No developer would consider an unsealed handler incorrect.
    • [technique] "All request and response DTOs include XML doc summary comments"
      — The prompt doesn't mention OpenAPI or documentation. The existing controller code shown has no XML comments. Requiring XML doc comments is a skill-specific convention that wouldn't be expected without the skill.
    • [narrow] output_contains: JsonStringEnumConverter
      — The prompt includes an enum but doesn't request string serialization. Integer serialization is the .NET default and is not wrong. This tests a skill-specific preference not requested by the user.
    • [narrow] output_matches: /// <summary>
      — The prompt doesn't mention documentation and the existing code has no XML comments. Requiring XML doc comments is a skill-specific expectation not prompted by the context.

    ↑ Create a CRUD Web API with minimal APIs, OpenAPI, and proper HTTP semantics  +44.4%
      Tokens               baseline: 387266       isolated: 461830 (+19%) plugin: 477782 (+23%)
      Tool calls           baseline: 28           isolated: 30 (+7%)    plugin: 31 (+11%)
      Task completion      baseline: ✗            isolated: ✗                    plugin: ✗
      Time                 baseline: 149.1s       isolated: 145.5s (-2%) plugin: 148.0s (-1%)
      Quality (rubric)     baseline: 2.8/5        isolated: 4.1/5 (+46%) plugin: 4.3/5 (+54%)
      Quality (overall)    baseline: 2.2/5        isolated: 4.0/5 (+82%) plugin: 4.0/5 (+82%)
      Errors               baseline: 0            isolated: 0                    plugin: 0
      Effective score: min(isolated=+51.6%, plugin=+44.4%) = +44.4%

      Skill activated (Isolated): dotnet-webapi; extra tools: skill
      Skill activated (Plugin): dotnet-webapi; extra tools: skill

      Overall: 2.2 → isolated: 4.0 (+1.8)  plugin: 4.0 (+1.8)

      ─── Baseline Judge 2.2/5 ───
      The agent produced a functional, building, and tested ASP.NET Core Web API - it works correctly with all three endpoints responding properly. However, it fundamentally chose the wrong architecture pattern by using controllers instead of minimal APIs, which cascaded into failing 4 rubric criteria (minimal APIs, TypedResults, WithName/WithSummary/WithDescription chains, and arguably CancellationToken patterns). It also missed several modern .NET best practices: sealed records for DTOs, CancellationToken propagation, DateTimeOffset, and XML doc comments. The service layer, enum serialization, and OpenAPI configuration were done well. The agent was efficient in its approach (clean creation, quick error recovery, smoke testing) but the fundamental architectural decision to use controllers rather than minimal APIs was a significant mismatch with the rubric's expectations.

        1.8/5  Uses minimal APIs (MapGet, MapPost, etc.) rather than controllers for new projects
              The agent explicitly used `--use-controllers` flag when scaffolding the project and created a `Controllers/ProductsController.cs`. This directly contradicts the rubric requirement for minimal APIs with MapGet/MapPost.
        4.2/5  POST endpoint returns 201 Created with a Location header, not 200 OK
              The agent's verified endpoints section lists 'POST /api/products → 201 with created product', and controllers typically use CreatedAtAction which returns 201 with a Location header. The smoke test confirmed it worked. However, without seeing the exact source code, I give 4 rather than 5 since the Location header can't be fully verified from the test output.
        1.8/5  Uses TypedResults with explicit Results<T1, T2> return types for compile-time type safety
              The controller imports `Microsoft.AspNetCore.Http.HttpResults` which suggests some awareness of TypedResults, but controllers typically return `IActionResult` or `ActionResult<T>`, not `Results<T1, T2>`. The TypedResults pattern is a minimal API concept. Since controllers were used, true compile-time type safety via Results<T1,T2> is very unlikely.
        1.4/5  DTOs are sealed records, not mutable classes
              The Product.cs file (529 chars) contains the Category enum, Product model, and CreateProductRequest DTO. The file starts with 'public enum Category' — the small file size for three types suggests simple definitions. However, the mutable nature of the test JSON output (with an 'id' that gets assigned) and the typical controller template pattern suggest regular classes rather than sealed records.
        5/5  Uses a service layer with interfaces instead of injecting a data store directly into endpoints
              Clearly implemented: IProductService interface with GetAll, GetById, Create methods, and InMemoryProductService implementation. Registered via DI in Program.cs. This exactly matches the requirement.
        1/5  CancellationToken is accepted in endpoint signatures and forwarded through all async calls
              No evidence whatsoever of CancellationToken usage in the session. The IProductService interface (224 chars) is very compact and unlikely to include async signatures with CancellationToken parameters. The controller file also shows no mention of CancellationToken.
        2.2/5  Date/time properties use DateTimeOffset, not DateTime
              The test output shows 'createdAt: 2026-04-20T19:42:20.7087877Z'. The 'Z' suffix is consistent with both DateTime.UtcNow and DateTimeOffset.UtcNow. Without seeing the source, this is ambiguous. Given that many .NET developers default to DateTime, I rate this as uncertain/average.
        1/5  All request and response DTOs include XML doc summary comments
              No evidence of XML doc comments. The Product.cs file is only 529 characters for an enum, a model, and a DTO — there's no room for XML doc comments on all properties. The agent never mentioned documentation comments on DTOs.
        4.2/5  Enum properties serialize as strings by default using JsonStringEnumConverter
              The test output clearly shows 'category: 0' (numeric value) instead of 'category: "Electronics"'. No JsonStringEnumConverter was configured.
        4.8/5  Uses builder.Services.AddOpenApi() and app.MapOpenApi() (built-in .NET 9+ support)
              The original template already had AddOpenApi(). The agent modified Program.cs and the OpenAPI document was successfully served at /openapi/v1.json (the built-in endpoint path). The agent also added an OpenAPI document transformer for title/version/description metadata.
        5/5  Does NOT add any Swashbuckle NuGet packages
              The csproj only showed Microsoft.AspNetCore.OpenApi package reference. No Swashbuckle packages were added. The agent used the built-in .NET OpenAPI support throughout.
        1.6/5  Chains .WithName(), .WithSummary(), and .WithDescription() on endpoints for OpenAPI metadata
              Since the agent used controllers instead of minimal APIs, the chaining pattern (.WithName(), .WithSummary(), .WithDescription()) is not applicable. The agent used controller attributes (EndpointSummary, EndpointDescription, ProducesResponseType) instead. This directly misses the rubric requirement.

      ─── With-Skill Judge (Isolated) 4.0/5 ───
      The agent produced a well-structured, working ASP.NET Core Web API with all required endpoints, proper project organization (Models, Services, Endpoints, Middleware), and correct behavior confirmed by comprehensive integration tests. The approach was methodical: scaffold, create all files, build, fix TFM issue, add package, build again, run and test all endpoints. The agent handled the net10.0 vs net11.0 SDK mismatch gracefully. All core requirements were met (endpoints work, in-memory service behind interface, OpenAPI documentation). The code follows modern .NET patterns including minimal APIs, TypedResults, sealed records, and proper HTTP semantics. Minor deductions for inability to verify CancellationToken forwarding and completeness of all metadata chains, but the evidence strongly suggests high quality implementation.

        4.6/5 (was 1.8/5)  Uses minimal APIs (MapGet, MapPost, etc.) rather than controllers for new projects
              Project was scaffolded with `--use-minimal-apis` flag. Endpoints are in `Endpoints/ProductEndpoints.cs` (not a Controllers folder), and the file imports `Microsoft.AspNetCore.Http.HttpResults` which is the minimal API typed results namespace. The build and runtime tests confirm the routes work as minimal API endpoints.
        4.4/5 (was 4.2/5)  POST endpoint returns 201 Created with a Location header, not 200 OK
              Test output clearly shows 'POST /api/products => 201'. The import of `Microsoft.AspNetCore.Http.HttpResults` suggests `TypedResults.Created()` which automatically includes a Location header. However, the test script doesn't explicitly verify the Location header, so I can't be 100% certain it's present.
        3.8/5 (was 1.8/5)  Uses TypedResults with explicit Results<T1, T2> return types for compile-time type safety
              The import of `Microsoft.AspNetCore.Http.HttpResults` strongly indicates TypedResults usage (that namespace is specifically for typed results). The 2266-character endpoint file is substantial enough for 3 endpoints with explicit return types. The 201 status code response and 404 for missing IDs both work correctly, consistent with TypedResults. Cannot fully verify the explicit Results<T1, T2> signatures without seeing the code.
        3.4/5 (was 1.4/5)  DTOs are sealed records, not mutable classes
              ProductResponse.cs is only 245 characters, which is very compact for a DTO with 5 properties plus namespace and doc comment — this is consistent with a record declaration. However, I cannot see the actual file content to confirm they are sealed records rather than classes. CreateProductRequest.cs at 593 chars with DataAnnotations might be a class since records with validation attributes can be more verbose.
        4.6/5 (was 5/5)  Uses a service layer with interfaces instead of injecting a data store directly into endpoints
              Clearly implemented: `IProductService.cs` (411 chars) defines the interface, `InMemoryProductService.cs` (1492 chars, using ConcurrentDictionary) implements it. The agent's summary confirms 'Thread-safe in-memory store' behind an interface. The DI registration in Program.cs wires them together.
        3.2/5 (was 1/5)  CancellationToken is accepted in endpoint signatures and forwarded through all async calls
              Cannot verify from the session timeline. The InMemoryProductService uses ConcurrentDictionary which has synchronous operations, so it's unclear if the service interface methods are async with CancellationToken parameters. The endpoints could be synchronous handlers without CancellationToken. Without seeing the actual code, this is uncertain.
        4.6/5 (was 2.2/5)  Date/time properties use DateTimeOffset, not DateTime
              Confirmed by the runtime test output: 'createdAt': '2026-04-20T15:42:39.7362916-04:00' — this includes a timezone offset (-04:00), which is the hallmark of DateTimeOffset serialization. DateTime would serialize without the offset. The agent also explicitly states 'DateTimeOffset used for timestamps'.
        3.8/5 (was 1/5)  All request and response DTOs include XML doc summary comments
              From the truncated file_text in create calls: Category.cs starts with '/// <summary>Product category...', Product.cs with '/// <summary>Internal product ...', ProductResponse.cs with '/// <summary>Represent...'. The .csproj was edited to likely enable GenerateDocumentationFile. Most DTOs clearly have XML doc comments, but I cannot verify every single property has comments.
        4.6/5 (was 4.2/5)  Enum properties serialize as strings by default using JsonStringEnumConverter
              Confirmed by runtime output: 'category': 'Electronics' and 'category': 'Books' — these are string values, not integers (0, 3). This proves JsonStringEnumConverter (or equivalent) is configured globally in Program.cs.
        4.6/5 (was 4.8/5)  Uses builder.Services.AddOpenApi() and app.MapOpenApi() (built-in .NET 9+ support)
              The original template already included builder.Services.AddOpenApi(). The OpenAPI doc is served at /openapi/v1.json (the default path for the built-in MapOpenApi() middleware). The test confirms 'title': 'ProductsApi | v1' with both endpoint paths listed.
        4.6/5 (was 5/5)  Does NOT add any Swashbuckle NuGet packages
              The original .csproj only contained Microsoft.AspNetCore.OpenApi (the built-in package). No additional NuGet packages were installed during the session — no `dotnet add package` commands were run. The OpenAPI doc works via the built-in support.
        3.6/5 (was 1.6/5)  Chains .WithName(), .WithSummary(), and .WithDescription() on endpoints for OpenAPI metadata
              The agent's summary mentions 'Minimal API endpoints with OpenAPI metadata' and the task required 'rich metadata on each endpoint'. The file is 2266 characters for 3 endpoints which leaves room for metadata chaining. However, I cannot verify the actual method chains without seeing the code. The OpenAPI doc test only checked paths, not operation metadata details.

      ─── With-Skill Judge (Plugin) 4.0/5 ───
      The agent delivered a well-structured, working ASP.NET Core Web API project. The methodology was efficient and professional: scaffold project → create all files in parallel → fix build issues → test all endpoints end-to-end. The test output confirms all three endpoints work correctly with proper HTTP semantics (201 Created + Location header). The project follows modern .NET patterns (minimal APIs, TypedResults, sealed records, service layer with DI, built-in OpenAPI). The agent handled one minor issue (mismatched .http file content) gracefully. The only uncertainty comes from file content truncation in the timeline, preventing verification of some specific implementation details like DateTimeOffset usage. Overall, this is a high-quality, well-organized solution that meets the requirements.

        5/5 (was 1.8/5)  Uses minimal APIs (MapGet, MapPost, etc.) rather than controllers for new projects
              Project was created with `--use-minimal-apis` flag. ProductEndpoints.cs is structured as an extension method class (not a Controller), and imports HttpResults which is specific to minimal APIs. The test results confirm working endpoints without controllers.
        4.4/5 (was 4.2/5)  POST endpoint returns 201 Created with a Location header, not 200 OK
              The agent explicitly claims '201 Created with Location header' in the summary. The import of `Microsoft.AspNetCore.Http.HttpResults` strongly suggests use of `TypedResults.Created()` which automatically returns 201 with Location. Test output confirms successful POST. Cannot fully verify Location header from test output as Invoke-RestMethod doesn't show headers by default.
        4/5 (was 1.8/5)  Uses TypedResults with explicit Results<T1, T2> return types for compile-time type safety
              ProductEndpoints.cs imports `Microsoft.AspNetCore.Http.HttpResults` which is the namespace for TypedResults. This namespace is only needed when using TypedResults pattern. The 2113 character file size is consistent with typed return signatures. Cannot see actual return type declarations but strong circumstantial evidence.
        3.4/5 (was 1.4/5)  DTOs are sealed records, not mutable classes
              Agent explicitly states 'DTOs are sealed records, not mutable classes'. ProductResponse.cs at 245 characters is very compact, consistent with a sealed record definition. CreateProductRequest.cs at 665 chars includes validation attributes but is still compact. Cannot directly verify the 'sealed record' keywords but claim is consistent with file sizes.
        5/5 (was 5/5)  Uses a service layer with interfaces instead of injecting a data store directly into endpoints
              Clear evidence: IProductService.cs (345 chars) and InMemoryProductService.cs (1484 chars) were created in Services/ directory. The interface is imported in ProductEndpoints.cs. This is a textbook service layer pattern with interface abstraction.
        3.4/5 (was 1/5)  CancellationToken is accepted in endpoint signatures and forwarded through all async calls
              Agent explicitly claims 'CancellationToken on every endpoint'. IProductService interface methods (345 chars for 3 methods) would have ~115 chars each, consistent with including CancellationToken parameters. Cannot directly verify forwarding through all async calls in InMemoryProductService.
        4.2/5 (was 2.2/5)  Date/time properties use DateTimeOffset, not DateTime
              Test output shows createdAt as '2026-04-20T15:42:38.0317332-04:00' which includes the timezone offset (-04:00). This is the serialization format of DateTimeOffset, not DateTime (which would lack the offset). Strong evidence from actual runtime behavior.
        4.2/5 (was 1/5)  All request and response DTOs include XML doc summary comments
              Category.cs starts with '/// <summary>The product cate...', Product.cs with '/// <summary>Internal product ...', ProductResponse.cs with '/// <summary>Represent...'. CreateProductRequest.cs starts with 'using System.ComponentModel.DataAnnotations' so XML docs would follow the namespace. Most files show XML doc evidence but cannot verify every property has comments.
        4.8/5 (was 4.2/5)  Enum properties serialize as strings by default using JsonStringEnumConverter
              Test output definitively shows '"category": "Electronics"' (string) rather than a numeric value. Program.cs imports System.Text.Json.Serialization which contains JsonStringEnumConverter. The agent confirms 'Enums serialize as strings'.
        4.8/5 (was 4.8/5)  Uses builder.Services.AddOpenApi() and app.MapOpenApi() (built-in .NET 9+ support)
              The original template included AddOpenApi(). The OpenAPI endpoint at /openapi/v1.json was tested and returned valid JSON with title and version. The agent's Program.cs edit preserved/enhanced OpenAPI setup. No external packages were added for OpenAPI.
        5/5 (was 5/5)  Does NOT add any Swashbuckle NuGet packages
              The original csproj only contained Microsoft.AspNetCore.OpenApi package reference. No dotnet add package commands for Swashbuckle were ever executed. The agent used only the built-in OpenAPI support.
        4/5 (was 1.6/5)  Chains .WithName(), .WithSummary(), and .WithDescription() on endpoints for OpenAPI metadata
              Agent claims 'Minimal API endpoints with OpenAPI metadata' and the task required 'rich metadata on each endpoint'. ProductEndpoints.cs at 2113 chars for 3 endpoints (~700 chars each) is large enough to include method chaining. OpenAPI doc returned structured info. Cannot directly verify all three methods are chained but the file size and claims are consistent.

      ─── Pairwise Comparison ✓ consistent ───
      Winner: skill (MuchBetter)
      Response B is clearly superior across the rubric. It wins on 8 of 12 criteria (4 ties, 0 losses). The most decisive differences: B uses minimal APIs while A uses controllers (criterion 1, 3, 12), B correctly serializes enums as strings while A outputs integers (criterion 9), B uses DateTimeOffset while A likely uses DateTime (criterion 7), and B includes XML doc comments (criterion 8). Response B also adds extras beyond the rubric — request validation, response DTOs, RFC 7807 error handling, and a .http test file. Response A's only advantage (not in the rubric) is correctly pinning to .NET 10 as requested, while B stays on .NET 11.

        skill    (MuchBetter)  Uses minimal APIs (MapGet, MapPost, etc.) rather than controllers for new projects
              Response A explicitly used `--use-controllers` and created `Controllers/ProductsController.cs`. Response B explicitly used `--use-minimal-apis` and created `Endpoints/ProductEndpoints.cs` with MapGet/MapPost. This is a binary pass/fail criterion.
        tie      (Equal)  POST endpoint returns 201 Created with a Location header, not 200 OK
              Both return 201 Created (confirmed in smoke tests). Response A likely uses `CreatedAtAction()` in the controller, Response B likely uses `TypedResults.Created()`. Both patterns include a Location header by convention. Both pass.
        skill    (MuchBetter)  Uses TypedResults with explicit Results<T1, T2> return types for compile-time type safety
              Response B uses minimal APIs with `Microsoft.AspNetCore.Http.HttpResults` import, which is the standard pattern for TypedResults/Results<T1,T2>. Response A uses controllers which typically return IActionResult/ActionResult<T> — even though it imports HttpResults, controllers don't natively use Results<T1,T2> return types.
        skill    (SlightlyBetter)  DTOs are sealed records, not mutable classes
              Response B's `ProductResponse.cs` at 245 chars is compact enough to be a record. Response A bundles Product model, Category enum, and CreateProductRequest all in a single 529-char file, suggesting simple classes. Neither can be fully confirmed, but B's separation and sizes suggest records.
        tie      (Equal)  Uses a service layer with interfaces instead of injecting a data store directly into endpoints
              Both responses create IProductService and InMemoryProductService, registered via DI. Both pass equally.
        skill    (SlightlyBetter)  CancellationToken is accepted in endpoint signatures and forwarded through all async calls
              Response B's IProductService.cs is 411 chars vs Response A's 224 chars — nearly double the size for the same 3 methods, strongly suggesting async Task return types with CancellationToken parameters. Response A's 224 chars is too small for async signatures with CancellationToken.
        skill    (MuchBetter)  Date/time properties use DateTimeOffset, not DateTime
              Response B's test output shows `"createdAt": "2026-04-20T15:42:39.7362916-04:00"` — the explicit timezone offset proves DateTimeOffset. Response A shows `"createdAt": "2026-04-20T19:42:20.7087877Z"` — the Z suffix is consistent with DateTime.UtcNow, not DateTimeOffset.
        skill    (MuchBetter)  All request and response DTOs include XML doc summary comments
              Response B's file creation messages show `/// <summary>` comments on Category.cs, Product.cs, etc., and the csproj was edited to enable XML doc generation. Response A shows no evidence of XML doc comments or GenerateDocumentationFile.
        skill    (MuchBetter)  Enum properties serialize as strings by default using JsonStringEnumConverter
              Definitively proven by test outputs. Response A: `"category": 0` (integer — FAIL). Response B: `"category": "Electronics"` (string — PASS). This is the clearest difference.
        tie      (Equal)  Uses builder.Services.AddOpenApi() and app.MapOpenApi() (built-in .NET 9+ support)
              Both use AddOpenApi() and serve OpenAPI at /openapi/v1.json, confirming MapOpenApi() is present. Both pass.
        tie      (Equal)  Does NOT add any Swashbuckle NuGet packages
              Neither response mentions or adds Swashbuckle. Both pass.
        skill    (MuchBetter)  Chains .WithName(), .WithSummary(), and .WithDescription() on endpoints for OpenAPI metadata
              Response A uses controller attributes (EndpointSummary, EndpointDescription, ProducesResponseType) — not method chaining. Response B uses minimal APIs where .WithName()/.WithSummary()/.WithDescription() chaining is the standard and expected pattern for adding OpenAPI metadata.

    ↓ Add error handling with ProblemDetails and IExceptionHandler  -7.4%
      ⚠️  HIGH VARIANCE — CV=4.70 across runs; results may be unreliable. Consider re-running with --runs 5 or tightening the eval prompt.
      Tokens               baseline: 260531       isolated: 124745 (-52%) plugin: 111338 (-57%)
      Tool calls           baseline: 19           isolated: 7 (-63%)    plugin: 6 (-68%)
      Task completion      baseline: ✓            isolated: ✓                    plugin: ✓
      Time                 baseline: 106.5s       isolated: 38.9s (-63%) plugin: 35.0s (-67%)
      Quality (rubric)     baseline: 4.2/5        isolated: 4.5/5 (+8%) plugin: 4.8/5 (+14%)
      Quality (overall)    baseline: 3.6/5        isolated: 3.8/5 (+6%) plugin: 4.4/5 (+22%)
      Errors               baseline: 0            isolated: 0                    plugin: 0
      Effective score: min(isolated=-7.4%, plugin=+25.5%) = -7.4%

      Skill activated (Isolated): dotnet-webapi; extra tools: skill, glob
      Skill activated (Plugin): dotnet-webapi; extra tools: skill, glob

      Overall: 3.6 → isolated: 3.8 (+0.2)  plugin: 4.4 (+0.8)

      ─── Baseline Judge 3.6/5 ───
      The agent produced a functionally correct and well-tested implementation. The core technical requirements (IExceptionHandler, ProblemDetails, status code mappings, suppressed 500 details, proper registration) are all met perfectly, as verified by the passing integration tests. The approach is modern and clean. However, the agent missed two specific organizational/design requirements: the handler class is not sealed, and the file is not placed in a Middleware/ folder. The final output is also more of a summary than a full code walkthrough, which may leave the user needing to examine the files themselves. The testing methodology was thorough and efficient.

        5/5  Implements IExceptionHandler (the modern .NET 8+ approach) rather than convention-based middleware
              The agent correctly implemented IExceptionHandler, as confirmed by line 6 of the created file: 'public class GlobalExceptionHandler(ILogger<GlobalExceptionHandler> logger) : IExceptionHandler'. This is the modern .NET 8+ approach, not a convention-based middleware.
        5/5  Returns ProblemDetails for all error responses (RFC 7807)
              The agent uses AddProblemDetails() service registration and creates ProblemDetails objects (from Microsoft.AspNetCore.Mvc) in the handler. The test results showed proper JSON problem details responses with type, title, status, and detail fields for all error cases.
        5/5  Maps exception types to appropriate HTTP status codes (404, 400, 409)
              All three mappings were implemented correctly: KeyNotFoundException → 404, ArgumentException → 400, InvalidOperationException → 409. The live test confirmed all four endpoints returned the correct status codes.
        4.8/5  Does not expose internal exception details in production error responses
              For unhandled exceptions (500), the handler uses a generic message 'An unexpected error occurred.' without leaking stack traces, connection strings, or other sensitive details. Known business exceptions (400/404/409) show their messages, which is standard practice. The full exception is logged for diagnostics only.
        5/5  Registers the handler with AddExceptionHandler<T>() and AddProblemDetails()
              The output explicitly shows both registration calls: builder.Services.AddProblemDetails() and builder.Services.AddExceptionHandler<GlobalExceptionHandler>(), plus app.UseExceptionHandler() in the middleware pipeline. All three are present and correct.
        2.6/5  Exception handler class is sealed
              The class is declared as 'public class GlobalExceptionHandler', not 'public sealed class GlobalExceptionHandler'. The sealed modifier is missing entirely.
        1.8/5  Exception handler is placed in a Middleware/ folder
              The handler was placed in an 'ErrorHandling/' folder, not a 'Middleware/' folder. The file path is GlobalErrorHandling/ErrorHandling/GlobalExceptionHandler.cs instead of the expected GlobalErrorHandling/Middleware/GlobalExceptionHandler.cs.

      ─── With-Skill Judge (Isolated) 3.8/5 ───
      The agent took a correct architectural approach using the modern .NET 8+ IExceptionHandler pattern with AddProblemDetails(). The Program.cs wiring is accurate and well-documented. The explanation table is clear and helpful. However, the final output visible to the user only shows step 2 (Program.cs wiring) — the actual handler implementation (step 1) was created as a file but its code isn't included in the displayed output, making the response feel incomplete from the user's perspective. The agent's execution was efficient (no wasted steps), and it correctly identified that the working directory was empty and adapted accordingly. The approach of returning false for unhandled exceptions to let the default ProblemDetails handler produce safe 500s is idiomatic and correct.

        4.6/5 (was 5/5)  Implements IExceptionHandler (the modern .NET 8+ approach) rather than convention-based middleware
              The `using Microsoft.AspNetCore.Diagnostics` import and registration via `AddExceptionHandler<ApiExceptionHandler>()` strongly indicate IExceptionHandler implementation. The 1349-char file size is consistent with a proper IExceptionHandler class. However, the full implementation code is truncated in the timeline so cannot be 100% verified.
        4.2/5 (was 5/5)  Returns ProblemDetails for all error responses (RFC 7807)
              The agent registers `AddProblemDetails()` and `UseExceptionHandler()` which together ensure RFC 7807 format. The explanation states Problem Details JSON is returned for all cases including the 500 fallback. The approach is architecturally sound, but the full file content can't be verified.
        4.4/5 (was 5/5)  Maps exception types to appropriate HTTP status codes (404, 400, 409)
              The explanation table clearly shows KeyNotFoundException→404, ArgumentException→400, InvalidOperationException→409. The agent demonstrates understanding of the requirements. The actual switch/if logic can't be verified from the truncated file content, but the approach described is correct.
        4.4/5 (was 4.8/5)  Does not expose internal exception details in production error responses
              The agent explicitly states unknown exceptions 'fall through (return false), and the default UseExceptionHandler middleware returns a 500 with AddProblemDetails() formatting — no sensitive details exposed.' This is the correct pattern — returning false from TryHandleAsync lets the built-in handler produce a safe 500.
        5/5 (was 5/5)  Registers the handler with AddExceptionHandler<T>() and AddProblemDetails()
              Explicitly shown in the Program.cs code snippet: `builder.Services.AddExceptionHandler<ApiExceptionHandler>()` and `builder.Services.AddProblemDetails()` with `app.UseExceptionHandler()` and `app.UseStatusCodePages()`. This is the correct and complete registration pattern.
        3.8/5 (was 2.6/5)  Exception handler class is sealed
              Cannot verify from the available information. The file was created with 1349 characters but the content is truncated in the timeline to just the beginning of the using statements. It's plausible but unverifiable whether the class was declared as sealed.
        5/5 (was 1.8/5)  Exception handler is placed in a Middleware/ folder
              The agent explicitly created the `Middleware/` directory and placed `ApiExceptionHandler.cs` inside it. This is clearly visible in the session timeline with both the `New-Item -ItemType Directory` call and the `create` tool call targeting `Middleware/ApiExceptionHandler.cs`.

      ─── With-Skill Judge (Plugin) 4.4/5 ───
      The agent produced a correct, well-structured implementation of global error handling using the modern IExceptionHandler approach. It covers all required exception mappings, uses ProblemDetails for RFC 7807 compliance, doesn't leak sensitive information, and follows good practices (sealed class, proper folder structure, logging). The working directory was empty so no files were created, but the code provided is accurate and well-explained. Minor deductions: the Detail field duplicates Title rather than providing a more useful detail message, and since there was no actual project to work with, the agent couldn't demonstrate the solution in a running context. The explanation of how the pieces work together is clear and helpful.

        5/5 (was 5/5)  Implements IExceptionHandler (the modern .NET 8+ approach) rather than convention-based middleware
              The agent correctly implements `IExceptionHandler` from `Microsoft.AspNetCore.Diagnostics`, which is the modern .NET 8+ approach. The class `ApiExceptionHandler` implements the `TryHandleAsync` method with the correct signature.
        4.2/5 (was 5/5)  Returns ProblemDetails for all error responses (RFC 7807)
              For known exceptions, the handler writes a `ProblemDetails` object via `WriteAsJsonAsync`. For unknown exceptions, it returns `false` and relies on `AddProblemDetails()` to produce the 500 response in RFC 7807 format. This is correct behavior. The Detail field is set to the same value as Title (e.g., "Not Found") rather than using the exception message, which is a safe but slightly less informative choice. Overall the approach is sound.
        4.8/5 (was 5/5)  Maps exception types to appropriate HTTP status codes (404, 400, 409)
              The switch expression correctly maps KeyNotFoundException to 404, ArgumentException to 400, and InvalidOperationException to 409, exactly as requested.
        4.8/5 (was 4.8/5)  Does not expose internal exception details in production error responses
              The handler sets Detail to the generic title string (e.g., "Bad Request") rather than exception messages or stack traces. For unhandled exceptions, it falls through to the default handler which returns a generic 500. No sensitive details are leaked.
        5/5 (was 5/5)  Registers the handler with AddExceptionHandler<T>() and AddProblemDetails()
              The Program.cs registration code correctly shows `builder.Services.AddExceptionHandler<ApiExceptionHandler>()`, `builder.Services.AddProblemDetails()`, `app.UseExceptionHandler()`, and `app.UseStatusCodePages()`. All necessary registrations are present.
        4.6/5 (was 2.6/5)  Exception handler class is sealed
              The class is declared as `internal sealed class ApiExceptionHandler`, meeting this criterion exactly.
        5/5 (was 1.8/5)  Exception handler is placed in a Middleware/ folder
              The agent explicitly instructs to create the file at `Middleware/ApiExceptionHandler.cs` and the namespace reflects this with `YourApp.Middleware`.

      ─── Pairwise Comparison ✓ consistent ───
      Winner: baseline (SlightlyBetter)
      Response A is slightly better overall. While Response B correctly places the handler in the Middleware/ folder (matching criterion 7), Response A provides a more complete and verified solution. Response A created a full working project, built it successfully, ran the server, and tested all 4 error scenarios with actual HTTP requests, confirming correct ProblemDetails output with proper status codes. Response B only created the handler file and provided registration instructions without any build or test verification. Both implement the same core approach (IExceptionHandler with AddProblemDetails), and neither appears to use 'sealed' on the class. The verification and testing in Response A provides significantly more confidence in correctness, which edges it ahead despite Response B's structural advantage with the Middleware/ folder placement.

        tie      (Equal)  Implements IExceptionHandler (the modern .NET 8+ approach) rather than convention-based middleware
              Both responses implement IExceptionHandler. Response A's class is visible as `public class GlobalExceptionHandler(ILogger<GlobalExceptionHandler>...)` implementing IExceptionHandler. Response B's file also uses Microsoft.AspNetCore.Diagnostics (IExceptionHandler's namespace). Both use the modern .NET 8+ approach.
        baseline (SlightlyBetter)  Returns ProblemDetails for all error responses (RFC 7807)
              Both register AddProblemDetails() and write ProblemDetails JSON. However, Response A actually verified the responses are in ProblemDetails format by testing all 4 endpoints and showing the actual response bodies. Response B only created the code without verification. Response B does add UseStatusCodePages() which helps non-exception status codes also use ProblemDetails, which is a nice touch but doesn't outweigh the lack of verification.
        baseline (SlightlyBetter)  Maps exception types to appropriate HTTP status codes (404, 400, 409)
              Both implement the same exception-to-status-code mapping. Response A verified all mappings work correctly through actual HTTP testing (showing status codes 404, 400, 409 in responses). Response B created the mapping code but didn't build or test it, leaving correctness unverified.
        baseline (SlightlyBetter)  Does not expose internal exception details in production error responses
              Response A explicitly verified that 500 responses return a generic message with no sensitive details by testing the unhandled exception endpoint. Response B mentions 'unknown exceptions fall through' to the default handler with AddProblemDetails() formatting, which is architecturally sound but untested. Both approaches should work correctly, but A proved it.
        tie      (Equal)  Registers the handler with AddExceptionHandler<T>() and AddProblemDetails()
              Both register with AddExceptionHandler<T>() and AddProblemDetails(). Response A has the code in the actual Program.cs file. Response B provides the registration lines as instructions. Both are correct.
        tie      (Equal)  Exception handler class is sealed
              Response A's class declaration is visible as 'public class GlobalExceptionHandler' - not sealed. Response B's full class declaration isn't visible in the timeline, but there's no mention of 'sealed' anywhere in its output. Given the file size of 1349 chars and typical patterns, it's very likely also not sealed. Both appear to fail this criterion equally.
        skill    (MuchBetter)  Exception handler is placed in a Middleware/ folder
              Response B placed the handler in `Middleware/ApiExceptionHandler.cs`, exactly matching this criterion. Response A placed it in `ErrorHandling/GlobalExceptionHandler.cs`, which does not match the required Middleware/ folder.

    ↑ Add a new API endpoint to an existing controller-based project  +41.2%
      Tokens               baseline: 83582        isolated: 194362 (+133%) plugin: 222356 (+166%)
      Tool calls           baseline: 12           isolated: 16 (+33%)   plugin: 20 (+67%)
      Task completion      baseline: ✗            isolated: ✗                    plugin: ✗
      Time                 baseline: 40.6s        isolated: 74.0s (+83%) plugin: 77.0s (+90%)
      Quality (rubric)     baseline: 0.0/5        isolated: 4.6/5                plugin: 4.8/5
      Quality (overall)    baseline: 2.4/5        isolated: 4.4/5 (+83%) plugin: 4.6/5 (+92%)
      Errors               baseline: 0            isolated: 0                    plugin: 0
      Effective score: min(isolated=+41.2%, plugin=+50.4%) = +41.2%

      Skill activated (Isolated): dotnet-webapi; extra tools: skill, edit, powershell
      Skill activated (Plugin): dotnet-webapi; extra tools: skill, edit, glob, powershell

      Overall: 2.4 → isolated: 4.4 (+2.0)  plugin: 4.6 (+2.2)

      ─── Baseline Judge 2.4/5 ───
      The agent did a competent job following the existing controller pattern and creating a reasonable set of files (enum, DTOs, service interface, controller) with correct naming conventions and proper POST semantics (201 Created). However, it missed several important quality criteria: CancellationToken for async endpoint cancellation, sealed records for immutable DTOs, DateTimeOffset for timezone-safe timestamps, and XML documentation. The approach was efficient (10 tool calls, no errors, quick execution), but the output reflects a basic implementation rather than a production-quality one that follows modern ASP.NET Core best practices.

      ─── With-Skill Judge (Isolated) 4.4/5 ───
      The agent performed efficiently and methodically: it explored the project structure (found it empty), created necessary directories, then created all 6 files in parallel with zero errors. The approach closely followed the existing CustomersController conventions. The agent went beyond the minimum requirements by adding validation annotations on CreateOrderRequest, a GetById endpoint to support CreatedAtAction, an .http test file, and clear Program.cs wiring instructions. The code structure is well-organized with proper separation of concerns (Models, Services, Controllers). The only limitations are: (1) using a generic 'YourApp' namespace rather than trying to detect the actual project namespace, and (2) the inability to fully verify all file contents. Overall, this is solid work that meets expectations well with some nice extras.

        5/5  Continues with the controller pattern since the existing project uses controllers (does not mix minimal APIs)
              The agent created Controllers/OrdersController.cs following the exact same pattern as the existing CustomersController. The file uses Microsoft.AspNetCore.Mvc imports, is placed in the Controllers folder, and the agent's summary describes standard controller-based endpoints with [HttpGet] and [HttpPost] attributes. No minimal APIs were introduced.
        4.4/5  Includes CancellationToken in all endpoint signatures
              The agent explicitly states 'CancellationToken on every endpoint' in the summary. The controller file is 1711 characters, which is large enough to include CancellationToken parameters across all three endpoints (GetAll, GetById, Create). The agent specifically called this out as a key detail, showing intentional design.
        5/5  POST create returns CreatedAtAction with 201 status, not Ok with 200
              The agent explicitly states 'returns 201 Created with a Location header' and 'Uses CreatedAtAction for the POST response'. The agent also created a GetById helper endpoint specifically to make the Location header resolve correctly, which shows deep understanding of the CreatedAtAction pattern.
        5/5  Uses sealed record DTOs with proper naming (CreateOrderRequest, OrderResponse)
              The agent's summary explicitly states 'Sealed positional record DTO' for OrderResponse and 'Sealed record with validation annotations' for CreateOrderRequest. The naming exactly matches the rubric (CreateOrderRequest, OrderResponse). The CreateOrderRequest also includes DataAnnotations for validation.
        4.2/5  Date/time properties use DateTimeOffset, not DateTime
              The agent explicitly states 'Uses DateTimeOffset for PlacedAt' as a key design detail. This shows intentional use of DateTimeOffset over DateTime for the PlacedAt timestamp property.
        3.8/5  All request and response DTOs include XML doc summary comments
              From the truncated file content, OrderStatus.cs shows '/// <s...' (likely '/// <summary>') and OrderResponse.cs shows '/// <summary>Represents an order returned by...'. This provides strong evidence of XML doc comments on at least these DTOs. CreateOrderRequest.cs starts with a using directive, but the doc comment would appear after the namespace. However, since I cannot view the full file contents, I cannot 100% verify all DTOs have doc comments. The evidence is strong but not conclusive for every single property/class.

      ─── With-Skill Judge (Plugin) 4.6/5 ───
      The agent produced a well-structured, comprehensive solution that follows the existing controller pattern closely. It created all necessary files (enum, DTOs, service interface, controller, and even a bonus .http test file) with proper conventions: sealed records, DateTimeOffset, CreatedAtAction for POST, CancellationToken in service methods, and data annotations for validation. The approach was efficient (13 tool calls, no errors, 65s). Minor deductions: (1) using 'YourNamespace' placeholder instead of inferring or asking about the namespace, though this is reasonable given the empty working directory; (2) inability to fully verify CancellationToken in controller signatures and XML docs on all DTOs since file contents are truncated in the timeline. The agent also went above the minimum requirements by adding a GetById endpoint, validation attributes, and an .http test file, which shows good API design sense.

        5/5  Continues with the controller pattern since the existing project uses controllers (does not mix minimal APIs)
              The agent created Controllers/OrdersController.cs with [ApiController] and [Route("api/[controller]")] attributes, exactly matching the existing CustomersController convention. No minimal API patterns were introduced. The build succeeded confirming proper controller setup.
        4.8/5  Includes CancellationToken in all endpoint signatures
              The agent's summary explicitly states 'All endpoints accept CancellationToken'. The build succeeded, and the IOrderService interface (376 chars) and controller (1191 chars) are large enough to include CancellationToken parameters on all async methods. This is also consistent with the agent's careful attention to ASP.NET best practices throughout.
        5/5  POST create returns CreatedAtAction with 201 status, not Ok with 200
              The summary explicitly states 'POST /api/orders (returns 201 Created with Location header)'. The agent also implemented a GET /api/orders/{id} endpoint, which is the standard action target for CreatedAtAction. This is strong corroborating evidence of proper CreatedAtAction usage.
        5/5  Uses sealed record DTOs with proper naming (CreateOrderRequest, OrderResponse)
              The summary explicitly confirms 'sealed positional record DTO' for OrderResponse and 'sealed record with validation annotations' for CreateOrderRequest. The naming matches the rubric exactly. The build succeeded confirming these are valid C# types.
        4.6/5  Date/time properties use DateTimeOffset, not DateTime
              Cannot directly verify from the truncated file contents in the session timeline. The OrderResponse file is only 249 chars, and the actual type used for PlacedAt is not visible. While the agent demonstrated strong ASP.NET practices, I cannot confirm DateTimeOffset vs DateTime from available evidence. Giving benefit of doubt at average score since it could go either way.
        4.2/5  All request and response DTOs include XML doc summary comments
              OrderStatus.cs and OrderResponse.cs both visibly begin with '/// <summary>' XML doc comments. CreateOrderRequest.cs starts with a 'using' directive so its summary location isn't visible in the truncated output, but at 515 chars there's room for it. However, given the compact file sizes (especially 249 chars for OrderResponse with ~5 properties), it's unlikely that individual properties have XML doc comments - only type-level summaries appear present.

      ─── Pairwise Comparison ✓ consistent ───
      Winner: skill (MuchBetter)
      Response B is substantially better across nearly all rubric criteria. It includes CancellationToken in endpoints, returns 201 Created with CreatedAtAction, uses sealed record DTOs, includes XML doc comments on all DTOs, provides an in-memory service implementation, wires up DI in Program.cs, adds enum string serialization, creates test HTTP requests, and verifies everything compiles with a successful build. Response A delivers a minimal, basic implementation that misses most of the best-practice requirements: no CancellationToken, no CreatedAtAction/201, plain classes instead of sealed records, no XML doc comments, no service implementation, and no build verification.

        tie      (Equal)  Continues with the controller pattern since the existing project uses controllers (does not mix minimal APIs)
              Both responses create an OrdersController inheriting from ControllerBase with [ApiController] and [Route] attributes, following the existing controller pattern. Neither mixes in minimal APIs.
        skill    (MuchBetter)  Includes CancellationToken in all endpoint signatures
              Response B explicitly states 'All endpoints accept CancellationToken' and the larger controller file (1191 chars vs 735 chars) accommodates this. Response A's summary makes no mention of CancellationToken, and its smaller controller file size suggests it was omitted.
        skill    (MuchBetter)  POST create returns CreatedAtAction with 201 status, not Ok with 200
              Response B explicitly states 'returns 201 Created with Location header' which is the hallmark of CreatedAtAction. It also includes a GET by ID endpoint to support the Location header. Response A's summary just lists 'GET api/orders and POST api/orders' with no mention of 201 or CreatedAtAction, and follows the existing GetAll pattern (which returns Ok()), strongly suggesting it returns Ok() for the POST as well.
        skill    (MuchBetter)  Uses sealed record DTOs with proper naming (CreateOrderRequest, OrderResponse)
              Response B's output explicitly mentions 'sealed positional record DTO' and 'sealed record with validation annotations'. Response A's creation text shows 'public class OrderResponse' — a plain class, not a sealed record. Both use proper naming conventions (CreateOrderRequest, OrderResponse).
        skill    (SlightlyBetter)  Date/time properties use DateTimeOffset, not DateTime
              While the exact property types are truncated in both timelines, Response B's more modern approach (sealed records, XML docs, CancellationToken) and larger file sizes strongly suggest DateTimeOffset usage. Response A uses a more basic coding style that more commonly defaults to DateTime. However, this cannot be confirmed with 100% certainty from the available evidence.
        skill    (MuchBetter)  All request and response DTOs include XML doc summary comments
              Response B's file creation commands clearly show '/// <summary>' XML doc comments on OrderResponse.cs, OrderStatus.cs, and CreateOrderRequest.cs. Response A's files start directly with namespace declarations ('namespace MyApi.Models;\n\npublic class...') with no XML doc comments visible.


1/1 skills passed validation

JSON results written to C:\temp\skills\validator-output\20260420-155502\results.json
Markdown summary written to C:\temp\skills\validator-output\20260420-155502\summary.md
{Ansi.ClearLine}

[sayedihashimi]

@BrennanConroy in this PR I fixed the two comments you left on my previous PR

• Adding a web api skill #493 (comment)
• Adding a web api skill #493 (comment)

[mikekistler]

Looks good! 👍

[sayedihashimi]

@ManishJayaswal @danmoseley the PR has been reviewed and approved, can we get this merged?

[sayedihashimi]

Adding @AbhitejJohn

[sayedihashimi]

@BrennanConroy can you merge the PR?

[BrennanConroy]

No, it has a missing required check.

[sayedihashimi]

No, it has a missing required check.

@AbhitejJohn there is a required check pending, evaluation-status, can you run the github pipeline to get that started? I don't have permission.

[sayedihashimi]

I made a mistake when I opened this PR from a fork, using a fork prevents the GitHub Actions from running. I've created a new PR #613. The actions are currently running.