Use this skill when asked to add a validation rule, business rule, or uniqueness constraint to an existing command in a Cratis-based project.

Use this skill when asked to create a strongly-typed domain identifier or value (such as ProjectId, AuthorName, InvoiceNumber) in a Cratis-based project. Produces a ConceptAs<T> record with the correct conversions and sentinel values.

Use this skill when asked to add a database table, column, relationship, or other schema change via Entity Framework Core in a Cratis-based project.

Use this skill when asked to add a Chronicle projection to a Cratis-based project. Enforces the AutoMap-first rule and Chronicle-specific join semantics.

This skill covers the full auth and identity stack in a Cratis Arc application. Read the relevant reference files below for detailed API usage.

A command represents a user action that changes state. In Cratis Arc the path is:

A read model is derived state built from events. The path is:

Use this skill when asked to check for performance issues, inefficiencies, or scalability problems in a Cratis-based project. Covers Chronicle projections, MongoDB query patterns, .NET allocations, and React render overhead.

Use this skill when asked to create a new feature, section, or page that does not yet exist in a Cratis-based project. Sets up the folder, composition page, routing, and navigation entry before any slices are added.

Step-by-step guidance for building a multi-step wizard dialog (StepperCommandDialog) in a Cratis Arc application. Use whenever a command requires gathering information across multiple steps, implementing a wizard flow, breaking a complex form into named stages, or using StepperCommandDialog, StepperPanel, validateOnInit, or wizard-style navigation.

Use this skill when asked to add or build a canvas-style icon toolbar using the @cratis/components Toolbar component. Covers Toolbar, ToolbarButton, ToolbarSeparator, ToolbarSection, ToolbarContext, and ToolbarFanOutItem. Use whenever building tool panels, drawing tool selectors, zoom controls, or any icon-button group with active states, context switching, or fan-out sub-panels.

Diátaxis Documentation Expert for Cratis projects. Writes high-quality DocFX documentation guided by the Diátaxis framework — classifying every page as a Tutorial, How-to Guide, Reference, or Explanation.

Use this skill when asked to write tests, specs, or test coverage for a command, query, or slice in a Cratis-based project. Produces BDD-style integration specs using xUnit and Cratis.Specifications.