Skill Claude CodeCodex
Step-by-step guidance for building a React page in a Cratis Arc application — DataPage lists, CommandDialog toolbar actions, row selection, details components, observable queries, and MVVM. Use when building or modifying a page that lists/displays data, adding a table, wiring Add/Edit/Delete, or connecting a component…
Skill Claude CodeCodex
Step-by-step guidance for creating a Cratis Chronicle read model from scratch — defining events, choosing between projection and reducer, [ReadModel] record with static query methods, and the generated TypeScript proxy in React. Use when creating a read model, working with [EventType], [ReadModel], IProjectionFor…
Skill Claude CodeCodex
Step-by-step guidance for writing C# specs in Cratis with BDD Specification by Example — the Establish/Because/should pattern, for/when/and folder hierarchy, reusable given/ contexts, NSubstitute mocking, and the in-process scenario family. Use when writing C# unit or integration specs or structuring the for/when/and…
Skill Claude CodeCodex
Step-by-step guidance for writing TypeScript specs in Cratis using BDD-style Specification by Example — the given()/describe/it pattern, for/when/ folder hierarchy, reusable context classes, Sinon mocking, and Chai assertions. Use whenever writing TypeScript specs or tests, creating spec files/folders, using the…
Skill Claude CodeCodex
Explains how vertical feature slices are structured in a Cratis Chronicle + Arc application — folder layout, the single backend .cs file, the four slice types (State Change/View/Automation/Translation), and how features compose slices. Use when asking how slices work, where files go, or which slice type to choose. To…
Skill Claude CodeCodex
Create and maintain Mermaid eventmodeling diagrams (EventModel.md) for a Cratis module or feature. Use when adding, renaming, moving, or deleting modules/features/slices, commands, events, read models, automations, translations, or cross-module event flows — to keep the diagram in sync with the code.
Skill Claude CodeCodex
Attach audit/correlation metadata to every appended Cratis event without polluting event types — via ICanProvideAdditionalEventInformation, plus event tags and the built-in EventContext fields. Use for correlation IDs, tenant/actor context, and other cross-cutting concerns that should travel with events but are not…
Skill Claude CodeCodex
Use this skill to diagnose why a Cratis slice misbehaves — read model not updating, TypeScript proxy missing, command rejected unexpectedly, projection/observer quarantined, AutoMap mismatch, reactor side effects not appended, or specs flaking. Symptom → likely cause → the rule/skill that owns the fix. Use when…
Skill Claude CodeCodex
Use this skill when asked to wire up a type that needs to enumerate every implementation of an interface (handlers, strategies, filters, validators, formatters, providers) in a Cratis-based C# project. Enforces IInstancesOf over IEnumerable and removes hand-maintained DI registrations.
Skill Claude CodeCodex
Use this skill to change, fix, or improve Cratis documentation whose source is under Documentation/ in a product or contributing repo. Docs are split across repos (each product owns its Documentation/ folder; the Documentation repo aggregates), so it finds the real source file, edits, syncs, and verifies. Trigger on…
Skill Claude CodeCodex
Design a Cratis event model before writing code — decide stream boundaries, commands, events, read models, automations/translations, compliance subjects, and the spec outline. Use this when behavior, event vocabulary, stream boundaries, or a multi-slice flow is not yet settled, before implementing a slice.
Skill Claude CodeCodex
Evolve a Cratis Chronicle event schema without breaking replay — add a new generation and an EventTypeMigration so old stored events upcast into the new shape. Use when an event needs a new required property, a renamed property, or a structural change after events of the prior shape already exist.
Skill Claude CodeCodex
Inspect or operate a running Chronicle server with the cratis CLI - list failed partitions, read why an observer is stuck, replay a partition, browse events, event types, read models, projections and jobs. Use when a question is about the state of a live store rather than the source code, when a projection will not…
Skill Claude CodeCodex
Isolate tenants in a Cratis application with Chronicle namespaces — Arc maps the current tenant to a namespace (TenantNamespaceResolver), and each namespace has its own events, projections, reducers, and read models. Use when one deployment must serve multiple tenants with data isolation. Keep it product-neutral — not…
Skill Claude CodeCodex
Use this skill when asked to implement a new feature, command, query, slice, or screen in a Cratis-based project. Guides the full end-to-end workflow: C# backend → Debug+Release build → specs → React frontend → quality gates.
Skill Claude CodeCodex
Practical guidance for debugging and exploring Cratis Arc observable queries with cURL or other plain HTTP clients. Use this whenever the user mentions observable queries together with cURL, curl, HTTP GET debugging, waiting for the first payload, Server-Sent Events, SSE, streaming JSON, or long polling. Also use it…
Skill Claude CodeCodex
Use this skill to visually QA rendered Cratis docs pages after changes under Documentation/ — screenshot headless in light AND dark, check diagrams/tables/code blocks render, and diagnose layout-shift ("flicker"/"jump"/"pop") bugs. Trigger on screenshot the docs, check how a page looks, review the docs visually…
Skill Claude CodeCodex
Add server-side paging and sorting to a Cratis read-model query — return IQueryable for one-shot paging, ISubject > for observable + paged results, and consume them from React with useWithPaging. Use when a list query can grow large enough that returning all rows is wasteful, or needs server-side sorting.
Skill Claude CodeCodex
Use this skill when asked to review, check, or validate code in a Cratis-based project. Produces a structured review report with blocking issues and suggestions, checked against all project architecture and style standards.
Skill Claude CodeCodex
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.
Skill Claude CodeCodex
Use this skill when asked to perform a security review or security audit of code in a Cratis-based project. Checks for injection, auth/authz, data exposure, secrets, and event-sourcing-specific vulnerabilities.
Skill Claude CodeCodex
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.
Skill Claude CodeCodex
Ship staged or unstaged local changes: create a branch, make logical commits, push to origin, open a PR with the correct description and label, merge it, prepare no-effect dispositions for related issues, and delete the branch locally and on origin. Use whenever the user asks to commit, push, create a PR, ship, or…
Skill Claude CodeCodex
Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, update or optimize an existing skill, run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill's description for better triggering accuracy.