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Build forms, validate data, and react to user input in Blazor. USE FOR adding forms, search boxes, filter panels, inline editing, data-entry UI, file uploads, validation (annotations or custom), handling form submissions, and binding input controls. Covers EditForm, built-in input components, DataAnnotationsValidator, custom validation, SSR form patterns (SupplyParameterFromForm, FormName, AntiforgeryToken, Enhance), and @bind for simple interactive controls. DO NOT USE for project scaffolding (
Passed 21 of 22 test cases with the skill, and 20 of 22 without it.
1 fixed20 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
A test case the skill fixed. Same model, same prompt, with and without the skill.
Please create a C# validator component and an EditForm example for a Blazor registration page. The form needs to validate model data annotations inline and support adding custom server-side validation messages returned from a backend API call on submission, clearing previous errors when fields change.
| Checked | Without skill | With skill |
|---|---|---|
| Uses ValidationMessageStore to manage custom server validation messages. | Passed | Passed |
| Includes a FormName attribute on the EditForm component. | Missed | Passed |
| Initializes the model property with null-coalescing assignment inside OnInitialized. | Missed | Passed |
The instructions your model reads when the skill loads.
Check AGENTS.md for Interactivity Mode and Interactivity Scope. This determines which form patterns apply:
| Mode | Form mechanism |
|---|---|
| None (Static SSR) | EditForm with FormName + [SupplyParameterFromForm]. No @bind, no @onchange. |
| Server | EditForm with @bind-Value. Full interactivity — real-time validation, dynamic UI. |
| WebAssembly | Same as Server, but validators needing server data must call APIs. |
| Auto | Same as WebAssembly — code must work in both browser and server. |
| Scope | Impact |
|---|---|
| Global | All forms are interactive. FormName only needed when explicitly opting a page to static SSR. |
| Per-page | Forms in static pages use FormName + [SupplyParameterFromForm]. Forms in @rendermode pages use @bind-Value. |
EditForm requires either Model or EditContext — never both.
<EditForm Model="Employee" OnValidSubmit="HandleSubmit" FormName="employee">
<DataAnnotationsValidator />
<ValidationSummary />
<label>
Name: <InputText @bind-Value="Employee!.Name" />
<ValidationMessage For="() => Employee!.Name" />
</label>
<button type="submit">Save</button>
</EditForm>
@code {
[SupplyParameterFromForm]
private EmployeeModel? Employee { get; set; }
test cases passed, vs 20 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.