Skies.Framework.Mail 4.1.4

<p align="center"> <img src="assets/logo.png" alt="Skies albatross engineer mascot" width="400"> </p>

<h1 align="center">Skies</h1>

<p align="center"><strong>Convention over configuration for AI-built .NET, Node.js, and React applications.</strong></p>

<p align="center"> <a href="#quick-install-with-your-agent">Quick Install</a> | <a href="#getting-started">Getting Started</a> | <a href="#the-convention-model">Conventions</a> | <a href="#the-doctor-and-the-gate">Verification</a> | <a href="#architecture">Architecture</a> | <a href="https://skies.build">Website</a> </p>

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AI coding agents are good at producing locally plausible code. They are less reliable at preserving a system's architecture, proving unhappy paths, keeping frontend and backend contracts aligned, and carrying hard-won repository knowledge through a long task or a different agent.

Skies reduces that decision space. It gives ordinary applications one visible shape for each operation, generators that begin in that shape, and removable doctors that reject structural drift. The result is not a new language or a runtime hidden behind magic. It is plain C#, TypeScript, Express, and React that a developer who has never heard of Skies can maintain.

Skies applies the Rails mindset — convention over configuration, an omakase front door, and strong quality control — without importing Rails' runtime mechanism.

<table> <tr><td><b>One operation shape</b></td><td>A slice keeps its input, output, handler, transport mapping, contract, and co-located proofs together.</td></tr> <tr><td><b>Explicit architecture</b></td><td>Modules, routes, dependencies, contracts, and registries remain visible in normal application code. There is no reflection discovery or hidden behavior.</td></tr> <tr><td><b>Removable enforcement</b></td><td>Roslyn, ESLint, topology doctors, and proof gates enforce the convention without owning runtime behavior.</td></tr> <tr><td><b>Closed verification</b></td><td>Declared acceptance criteria, tests, journeys, and product flows form one inventory. Missing or unavailable proof cannot become green.</td></tr> <tr><td><b>Repository-owned context</b></td><td>Decisions, proven ways, corrected failures, and conditional obligations live in Git and are retrieved before editing.</td></tr> <tr><td><b>Package-first framework</b></td><td>Applications consume versioned NuGet, npm, and Dart packages. Framework rules never hide as private copies inside a pilot.</td></tr> </table>

The established implementation targets .NET 10 and ASP.NET Core. The Node.js peer targets Node 24, strict TypeScript, and Express 5 while it advances through the explicit parity ledger. The frontend convention is plain React and React Native with a shared, render-agnostic TypeScript core. Flutter carries the complete frontend contract in idiomatic Dart: pinned dart-dio, ChangeNotifier MVVM, the app-owned design vocabulary, all 35 SKYFL rules, and real-backend integration_test evidence.

Quick install with your agent

Copy this prompt into a coding agent with terminal access:

Set up Skies in this repository.

Read https://github.com/lucasrgt/skies and inspect the existing application
before changing it. Use the native backend that matches the repository:

- .NET 10 / ASP.NET Core: install the latest stable skies-framework-cli as a
  user-local or repository-local dotnet tool, then use the `skies` command.
- Node 24 / TypeScript / Express 5: install the latest stable @skiesjs/cli,
  then use its `skies-node` command.
- Flutter stable: install `skies_flutter` plus the latest stable
  `skies-flutter`, then use its client and feature scaffolders.

For a new application, use the matching `new` generator. For an existing
application, preserve its behavior and migrate incrementally; do not replace
working application code wholesale. Keep all generated runtime behavior plain,
explicit, and doctor-removable.

Read the generated AGENTS.md and the applicable convention documents. Run the
repository's context command before implementation. Run the focused tests while
working, then the staged Skies check. Do not suppress a doctor rule to make the
result green and do not treat skipped, unavailable, or empty proof as passing.

Do not commit, push, or modify unrelated files. Report the selected runtime,
installed versions, generated or changed files, verification commands, and any
remaining action.

Manual installation

For a new .NET application:

dotnet tool install -g skies-framework-cli
skies new Billing
cd Billing
dotnet restore
dotnet tool run skies context --task "Verify the new application" --path src
dotnet tool run skies doctor

The global tool command is skies; generated repositories pin their own tool for repeatable team and CI execution through dotnet tool run skies.

For a new Node.js application:

npm install --global @skiesjs/cli
skies-node new billing-api
cd billing-api
npm install
npm run hooks:install
npm run gate:full

The two backends are native peers, not wrappers around one another. Choose the one that matches the application; both implement the same laws with their own language's ordinary mechanisms.

Getting started

.NET and ASP.NET Core

The Skies.Framework meta-package is the omakase front door: it brings the runtime convention and the Roslyn doctor in one reference.

dotnet add package Skies.Framework

The composition root stays a short index:

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddSkies();
builder.Services.AddPlatform(builder.Configuration);
builder.Services.AddModules(builder.Configuration);

var app = builder.Build();

app.UseSkies();
app.UsePlatform();
app.MapModules();

app.Run();

A feature is one static slice. Its handler is HTTP-agnostic; its map is the thin transport boundary:

[Slice]
public static class CreateInvoice
{
    public sealed record Input(Guid CustomerId, decimal Amount);
    public sealed record Output(Guid InvoiceId);

    public static async Task<Result<Output>> Handle(
        Input input,
        AppDb db,
        CancellationToken cancellationToken)
    {
        var amount = Money.From(input.Amount);
        var validation = new Validation()
            .Require(input.CustomerId, "customerId", BillingErrorCodes.CustomerRequired)
            .Collect("amount", amount);

        if (validation.Failed)
            return validation.ToError();

        var invoice = Invoice.Create(input.CustomerId, amount.Value);
        db.Invoices.Add(invoice);
        await db.SaveChangesAsync(cancellationToken);

        return new Output(invoice.Id);
    }

    public static void Map(IEndpointRouteBuilder app) =>
        app.MapPost("/invoices", async (Input input, AppDb db, CancellationToken ct) =>
                (await Handle(input, db, ct)).ToHttp())
            .RequireAuthorization()
            .WithName(nameof(CreateInvoice));
}

Generate the standard shapes instead of rebuilding them from memory:

skies g module Billing
skies g slice Billing CreateInvoice --verify request-idempotency
skies g entity Billing Invoice
skies g vo Money
skies g crud Billing Invoice
skies g auth
skies g hub Billing InvoiceUpdates
skies doctor

Node.js and Express 5

@skiesjs/framework is a dependency-only omakase package. Application code continues to import the focused packages directly; the meta-package exports no runtime facade and generates no behavior.

npm install @skiesjs/framework
npm install --save-dev @skiesjs/cli @skiesjs/foundation

A Node slice carries an executable Zod/OpenAPI contract beside the same visible Input / Output / handle / map spine:

export const contract = defineContract({
  operationId: "Billing.CreateInvoice",
  method: "post",
  path: "/invoices",
  auth: "required",
  kind: "app",
  request: { body: z.object({ customerId: z.uuid(), amount: z.number().positive() }) },
  success: { status: 201, output: z.object({ invoiceId: z.uuid() }) },
});

export async function handle(input: Input): Promise<Result<Output>> {
  return Result.ok(await createInvoice(input));
}

export function map(router: Router, openApi: OpenApiRegistry): void {
  mapSlice(router, openApi, contract, { toInput, handle });
}

The transactional generator updates the owning module explicitly and refuses collisions or partial writes:

skies-node g module Billing
skies-node g slice Billing CreateInvoice --method post --route /invoices
skies-node g value-object Billing InvoiceId
skies-node g crud Billing Invoice
skies-node g auth --issuer billing --audience billing-api
skies-node g hub Billing InvoiceUpdates

Drizzle/PostgreSQL, Socket.IO, and test helpers are opt-in satellites. They do not enter every application through the meta-package.

React and React Native

The frontend keeps the same locality without inventing a component framework:

features/billing/create-invoice/
  CreateInvoice.view.tsx
  CreateInvoice.viewModel.ts
  CreateInvoice.test.tsx
  create-invoice.i18n.ts

The ViewModel is a normal render-agnostic hook. It is the only data door and composes generated query hooks; the View remains a pure rendering function. @skiesjs/react provides the small shared spine (AsyncState, Resource, session, paging, and form helpers), while @skiesjs/eslint-plugin enforces the SKYFE### rules.

npm install @skiesjs/react
npm install --save-dev @skiesjs/eslint-plugin @skiesjs/frontend-sdk

The design layer follows the same rule: Skies standardizes semantic token names and the kit shape, while the application owns token values, components, and styling technology.

Flutter

Flutter keeps the generated wire and hand-owned behavior separate:

lib/features/account/wallets/
  wallets_view.dart
  wallets_view_model.dart
test/features/account/wallets/
  wallets_view_test.dart
  wallets_view_model_test.dart
  wallets.assay_test.dart
lib/l10n/features/
  wallets_{pt_BR,en,es}.arb
integration_test/
  wallets_happy_test.dart
  wallets_sad_test.dart

skies-flutter wraps stock OpenAPI Generator dart-dio, projects the app-client audience, scaffolds the mirrored MVVM unit, and runs the removable SKYFL001–035 doctor. The skies_flutter Dart package supplies the matching runtime spine: async composition, session, guards, routing, form and mutation defaults, localized errors, pagination, injected auth, and the E2E backend ledger.

npx --yes --package skies-flutter skies-flutter-app .
npm install
flutter pub add skies_flutter

Skies.toml needs no Flutter-only topology key: a declared frontend package with pubspec.yaml is gated through Flutter analysis, flutter_test, SKYFL, and official integration_test; React Native keeps its Vitest/Assay/Maestro path.

The convention model

Two laws

1. Stranger-maintainable. Generated and framework-guided output is ordinary, idiomatic application code. A developer does not need Skies knowledge to read, debug, or extend it.
2. Doctor-removable. Remove the analyzers, ESLint plugins, and foundation gate and the application still compiles and behaves the same. Only enforcement disappears.

These laws exclude hidden source generation of behavior, DSLs, base-controller runtimes, reflection discovery, generated UI behavior, and framework-owned business logic.

One feature, one readable unit

The convention favors direct dependencies and rich domain types. Handlers use the application's DbContext or explicit Node dependencies directly; there is no repository-per-entity or unit-of-work facade. Expected failures travel as a typed Result<T> with stable, namespaced error codes. Modules own their routes, services, errors, context, and writes.

Explicit composition

Skies makes registrations and topology boring on purpose:

• Program.cs / app.ts is a readable index, not a service-registration dump;
• modules are explicitly imported and registered, never discovered by scanning;
• a module writes only its own entities and refers to another module by id;
• HTTP contracts expose domain vocabulary, not client routes or translated copy;
• realtime is opt-in through skies g hub, never ambient infrastructure;
• vendor adapters and product rules belong to the application.

Repository-local context

Every generated application carries AVP plus the four Codebase Semantic Memory foundations. The primary coding agent operates them as one workflow:

The stores are readable, versioned team knowledge. Personal judge settings, credentials, caches, and SQLite indexes remain local and unversioned.

The doctor and the gate

The doctor turns the written convention into a build contract:

The gate closes proof around that structure. It inventories the complete workspace, maps the selected Git delta to its transitive proof closure, and emits an honest verification matrix.

Exit code 0 means every selected leg held. Exit code 1 means findings remain. Exit code 2 or greater means validation was incomplete. Skies does not translate a missing runner, malformed manifest, skipped proof, or empty receipt into success.

skies doctor, focused tests, linters, and individual foundation commands are useful during implementation; none replaces the scoped skies check receipt.

Packages

NuGet

npm

pub.dev

Use the meta-packages as the front doors and focused packages when the application needs an à-la-carte dependency graph.

Architecture

src/                         .NET runtime packages and CLI
analyzers/
  Skies.Framework.Doctor/    shipped SKY#### analyzer
  Skies.Framework.SelfHarness/ framework-development-only SKYSELF#### analyzer
node-sdk/
  packages/                  Node runtime, doctor, foundation, and CLI packages
  examples/                  minimal sample and proof-bearing pilot
frontend-sdk/
  packages/skies-react/      render-agnostic React spine
  packages/eslint-plugin/    SKYFE### rules
  tools/                     workspace and product-flow doctors
flutter-sdk/
  packages/skies_flutter/    Flutter runtime spine and integration-test ledger
  tools/                     dart-dio, MVVM/design scaffolds, SKYFL and full-stack gates
  parity/                    executable Flutter↔React capability contract
examples/sample-app/         canonical .NET backend and frontend
templates/skies-app/         source for `skies new`
parity/                      cross-runtime capability contract
docs/                        constitutions, architecture, and migration guides

The runtime and enforcement dependency directions stay one-way: application code uses normal packages; doctors inspect it but do not provide behavior; framework-development checks never enter published artifacts. The monorepo architecture defines package ownership, proof inventory, and the package-first release path.

Scope

Skies ships conventions, focused primitives, generators, and enforcement that are generic across applications and proven by real use.

It deliberately does not ship:

• source-generated behavior, a proprietary language, or a runtime applications must inherit from;
• reflection-based module or route discovery;
• vendor-specific adapters in core packages;
• business rules that belong to one product;
• generated frontend behavior or a styling-system runtime;
• realtime infrastructure unless an application explicitly generates it;
• abstractions whose only purpose is to hide ordinary framework code.

Removing the doctors must always leave a compiling, running, understandable application. A proposal that breaks that property is outside the framework.

Documentation

• .NET conventions and complete SKY#### catalog
• Node.js conventions and SKYN#### catalog
• Node.js parity ledger
• Frontend conventions and SKYFE### catalog
• Flutter conventions and SKYFL### structural band
• Design conventions and token/kit contract
• Monorepo architecture
• Migration to Skies 4
• .NET sample application
• Node.js package guide

Build and contribute

Requirements: .NET 10 SDK, Node.js 24, npm, Flutter stable, Java 21 for OpenAPI Generator, and Docker for the PostgreSQL integration proofs.

dotnet build Skies.Framework.slnx
dotnet test Skies.Framework.slnx

npm --prefix frontend-sdk ci
npm --prefix frontend-sdk run check

npm --prefix flutter-sdk ci
npm --prefix flutter-sdk run check

npm --prefix node-sdk ci
npm --prefix node-sdk run check
npm --prefix node-sdk run test:integration
npm --prefix node-sdk run package-smoke

npm run test:parity
npm run check:parity -- --ci

The repository's own self-harness treats missing public XML documentation, oversized framework files, and materialized agent notes as build failures. Fix the code or documentation; do not suppress the rule.

License

MIT © 2026 Lucas Tinoco.