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name reactor-dev
description Builds WinUI 3 desktop apps with Microsoft.UI.Reactor — a React-style declarative C# projection (no XAML, no data binding, no ViewModels). The concepts are React's; the spelling is C#. Use for creating new Reactor apps, adding features, converting from XAML/MVVM to Reactor, fixing bugs, or any Microsoft.UI.Reactor / functional WinUI task.
user-invocable true

Process

You build Reactor apps in this rhythm:

  1. Understand the task. Note what the app needs to do and what shape (single-file vs. .csproj). Don't guess at requirements.
  2. Draft. Sketch the component tree, identify state, decide where each piece lives. If you know how you'd build the equivalent in React, you already know the shape — just translate to the C# spelling.
  3. Write the files in a batch. Create the csproj, models, app root, and child components together in one stretch. Don't stop and rebuild after each file — build once at the end.
  4. Build and read the output. dotnet build (or dotnet run). Read errors and analyzer warnings; fix them in another batch; rebuild.

You generally do not need to load anything beyond reactor-getting-started — it carries the hooks table, the most-used factories, the React-to-Reactor mapping, theme tokens, and the critical gotchas. The full signatures index lives in reactor-dsl/references/reactor.api.txt if you need a less-common control.

When to load each skill

Skill Trigger
reactor-getting-started Any new Reactor work. Always first, almost always sufficient.
reactor-dsl Only when reactor-getting-started doesn't list the factory/modifier you need — points to the full api index.
reactor-build-and-check Build fails, you see a REACTOR_* analyzer warning, or you want one-line diagnostic output.
reactor-async Fetching data, caching, pagination, optimistic writes. UseResource, UseMutation, UseInfiniteResource.
reactor-design Visual styling — theme tokens beyond the basics, High Contrast, typography, 4px grid, accessibility audit.
reactor-forms Data-entry screens, validation, masked input. UseValidationContext, FormField.
reactor-navigation Multi-page apps, sidebar/tab navigation, routes, deep linking.
reactor-input Gestures, drag-drop, focus management.
reactor-charts Data visualization.
reactor-commanding Actions in multiple surfaces, keyboard shortcuts, CanExecute.
reactor-devtools Driving a running app via mur devtools for screenshots / inspection.
reactor-recipes You need a paste-ready snippet for a common pattern.

Loading every skill up front is the failure mode that bloats context. Load topical skills when the task hits them, not preemptively.

If the plugin isn't installed, fall back to mur --skill / mur --api / cache-map file reads. Those fallbacks cost a tool call per fetch and the content lands in conversation rather than the cacheable system prompt — prefer the in-plugin skills whenever they're available.

Best practices

  • Trust your React intuition for shape. Reactor's component model, hook semantics, key-based reconciliation, and "lift state up" pattern are all React. The C# spelling is the only thing new — verify exact names against the table in reactor-getting-started or the api index.
  • Batch your edits. A single turn that creates five related files is much cheaper than five turns that each create one. Same for fix-ups: read the build output, plan all the fixes, apply them together, then rebuild.
  • Build at the end, not after every file. One green build at the end is the goal, not a green build at every step.
  • Hooks must be called unconditionally. Same order every render. Conditionally use the result, not the call.
  • Single-file #:package is the default for new apps. Use a .csproj only when the app needs multiple files, analyzers (which only run with .csproj), or shared project references.
  • Don't grep src/Reactor/. The bundled api index is the source of truth for public API. Source-code grep is slower and includes private/internal noise.
  • Don't add features beyond what's asked. Reactor's DSL composes; resist building elaborate scaffolding for simple tasks.