Cratis.Arc.Core 22.14.0

Prefix Reserved

dotnet add package Cratis.Arc.Core --version 22.14.0

NuGet\Install-Package Cratis.Arc.Core -Version 22.14.0

This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.

<PackageReference Include="Cratis.Arc.Core" Version="22.14.0" />

For projects that support PackageReference, copy this XML node into the project file to reference the package.

<PackageVersion Include="Cratis.Arc.Core" Version="22.14.0" />
                    

                            Directory.Packages.props

<PackageReference Include="Cratis.Arc.Core" />
                    

                            Project file

For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package.

paket add Cratis.Arc.Core --version 22.14.0

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

#r "nuget: Cratis.Arc.Core, 22.14.0"

#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.

#:package Cratis.Arc.Core@22.14.0

#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package.

#addin nuget:?package=Cratis.Arc.Core&version=22.14.0
                    

                            Install as a Cake Addin

#tool nuget:?package=Cratis.Arc.Core&version=22.14.0
                    

                            Install as a Cake Tool

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Cratis Arc

Arc is an open-source (MIT) opinionated CQRS application framework for ASP.NET Core with commands, queries, validation, authorization, and TypeScript proxy generation. It works without event sourcing, with optional Chronicle integration.

Arc hosts application behavior, executes command and query pipelines, exposes recognized contracts over HTTP, and generates TypeScript clients for them. Its packages also cover observable queries, validation, identity and tenancy, React integration, current-state persistence, OpenAPI, analyzers, and testing. Chronicle event sourcing and Cratis Components are optional integrations.

Arc reflects a broader Cratis conviction: application plumbing should not be the hard part. Commands, queries, validation, and authorization are written as plain, idiomatic .NET code, designed to reduce friction and boilerplate in service of productivity, quality, and reliability. Arc is part of one deliberately simple ecosystem — AI-friendly by design, with free AI skills for building with the stack.

Start here

Browse the Arc documentation
Read why Arc exists
Map familiar concepts when coming from MediatR and MVC
Try runnable samples — including Idea Loom and Library
Choose a documented application path
Understand Arc's independent boundary
Start an Arc host
Inspect packages and repository layout

What Arc owns

Boundary	Arc provides
Hosting	ASP.NET Core hosting plus an Arc.Core HTTP host for workers, consoles, and custom services
Commands	Model-bound and controller-based execution, validation, authorization, filters, scopes, typed results, and generated endpoints
Queries	Model-bound and controller-based reads, paging and sorting, observable updates, WebSocket or Server-Sent Events transport, and query diagnostics
Validation	Data annotations, FluentValidation, concept/command/query validators, generated client rules, and optional server preflight from React forms
Identity and tenancy	Pluggable authentication, identity details, role-based authorization, and header, query, claim, subdomain, fixed, or development tenant resolution
Generated contracts	TypeScript proxies, referenced types, validation metadata, identity details, incremental output cleanup, and package/type mapping
Frontend packages	TypeScript command/query runtimes, React hooks and forms, dialogs, observable-query composition, and optional React/MVVM integration
Persistence integration	MongoDB and Entity Framework Core current-state adapters plus optional Chronicle-backed event-sourced behavior
Evaluation and tooling	OpenAPI, runtime introspection, analyzers, source generators, command scenarios, proxy-generation checks, Vite helpers, and ESLint rules

Each row is a documented capability area, not a promise of compatibility with every package, host, provider, browser, or product version.

Choose a path

Arc documentation is organized around the job you need to complete:

Execute commands — model-bound or controller-based changes, pipelines, validation, authorization, filters, and response handling.
Separate command decisions from inline side effects — preferred for already-decided work in model-bound commands, with optional best-effort compensation. Direct service calls remain supported; operations require neither Chronicle nor frontend recovery code.
Expose queries and observable results — request/response reads, paging, sorting, streaming updates, diagnostics, and generated clients.
Build the frontend — TypeScript runtimes, React hooks and forms, dialogs, identity, messaging, and optional MVVM packages.
Configure identity and access — authentication, identity details, authorization, roles, and frontend visibility boundaries.