Free, MIT-licensed AI skills, rules, and agent guidance for building event-sourced and CQRS applications with the Cratis ecosystem (preview).
This repository also configures its own agents. See what AI tells them →
Skill Claude CodeCodex
Create strongly typed Cratis domain values with ConceptAs and Chronicle event-source identities with EventSourceId . Use when a C# domain value has meaning beyond its primitive or when an identity is actually used as a Chronicle event-source/stream ID. Do not use for enums, DTO-only transport values, arbitrary…
Skill Claude CodeCodex
Classify Studio MCP requests and interpret already-redacted output without discovering or invoking operations. Use whenever a user asks an agent to inspect, query, change, navigate, or automate Studio through MCP, or asks whether a Studio MCP operation is safe. No Studio MCP implementation authority is admitted, so…
Skill Claude CodeCodex
Add OpenTelemetry tracing to a class in the Chronicle repository using the Cratis.Traces [Span] source generator, keyed IActivitySource injection, and the Chronicle tag extensions. Use when instrumenting Chronicle kernel or client internals; this is contributor guidance for the Chronicle repository itself, not for an…
Skill Claude CodeCodex
Apply the Cratis C# house conventions when writing or reviewing C# in a Cratis repository - formatting, naming, records and primary constructors, nullable handling, XML documentation, custom exceptions, structured logging, dependency injection, and service lifetimes. Use for any "how should this be written" C# style…
Skill Claude CodeCodex needs its repo
Write specifications for the React and TypeScript surface of a Cratis application slice — view models, helpers, command orchestration, and narrow component behavior — using Vitest with Mocha-style describe/it, Sinon, and the Chai should interface. Use when adding or changing frontend behavior in an application that…
Skill Claude CodeCodex
Wire authentication, authorization and identity in a Cratis Arc application — IProvideIdentityDetails and the /.cratis/me endpoint, the [Authorize]/[Roles]/[AllowAnonymous] attributes Arc actually evaluates, IAuthenticationHandler, the Microsoft Identity Platform header contract, tenant resolution, and the React…
Skill Claude CodeCodex
Execute an existing Cratis Arc command from backend code through ICommandPipeline — the scopeless and scoped overloads, the typed Execute , the pre-flight Validate, validation severity filtering, and how to read CommandResult. Use when a reactor, background job, scheduled task, or backend service must run a command…
Skill Claude CodeCodex
Define a Cratis Arc command — the [Command] record, its Handle() method and return shape, the optional Provide() step, and the generated TypeScript proxy. Use when adding a command, choosing what Handle() should return, deciding which values may reach the causation chain, or wiring a form or button to an Arc backend.…
Skill Claude CodeCodex
Change an Entity Framework Core schema in a Cratis Arc application — the DbContext base types Arc provides, the cross-database column helpers, JSON columns, how a migration is created and applied, and how an EF Core read model becomes injectable into a command. Use when adding or changing a table, column…
Skill Claude CodeCodex
Inspect a Cratis Arc observable query from a terminal with curl or another plain HTTP client — snapshot GET, waiting for the first result, Server-Sent Events streaming, and long polling, plus the exact query-string keys, status codes, and payload shape. Use when debugging or exploring an observable query without…
Skill Claude CodeCodex
Add server-side paging and sorting to a Cratis Arc read-model query — which return shapes Arc pages, the exact query-string keys, sorting pitfalls per storage provider, and the paged frontend hooks. Use when a list query can grow large enough that returning every row is wasteful, or needs server-side sorting. Do not…
Skill Claude CodeCodex
Build a React page in a Cratis Arc application with Cratis Components — DataPage lists, columns, toolbar menu items, command dialogs, confirmation and busy-indicator dialogs, row selection, details panes, snapshot and observable queries, paging, and MVVM view models. Use when building or changing a page that lists or…
Skill Claude CodeCodex
Inspect and operate a running Chronicle server with the cratis CLI - contexts and connection resolution, machine-readable output, failed partitions, observers, event sequences, read models, projections and jobs, and the authorization discipline for replay, retry, quarantine clearing and other mutations. Use when the…
Skill Claude CodeCodex
Talk to a Chronicle server from a standalone .NET application with the Cratis.Chronicle client - connection strings, ChronicleClient construction outside any host, AddCratisChronicle for a worker or ASP.NET host, [EventType] records, IEventSequence.Append, reactors and reducers found by assembly scanning, the…
Skill Claude CodeCodex
Talk to a Chronicle server from an Elixir application with the cratischronicle Hex package - putting Chronicle.Client in a supervision tree, connection strings, use Chronicle.Events.EventType structs, Chronicle.append returning ok or error tuples, reactors with the @handles attribute and a handle/2 callback…
Skill Claude CodeCodex
Talk to a Chronicle server from a Kotlin or Java application with the io.cratis:chronicle client - connection strings, ChronicleClient and the Spring Boot starter, @EventType classes, suspending append, reactors and reducers dispatched by first-parameter type, model-bound read models, classpath artifact discovery, and…
Skill Claude CodeCodex
Talk to a Chronicle server from a Node.js or TypeScript application with @cratis/chronicle - reflect-metadata and decorator compiler settings, ChronicleClient and connection strings, @eventType classes, eventLog.append, reactors and reducers dispatched by camelCase method name, model-bound and declarative projections…
Skill Claude CodeCodex
Model personal data in Chronicle with [PII] and [Subject], and erase it through crypto-shredding with IPIIManager. Use when an event or read model carries data about a natural person, when a subject must be identified for erasure, when a right-to-erasure request must be executed, or when redacting a stored event. Do…
Skill Claude CodeCodex
Design a Chronicle event model before writing code - stream boundaries and event-source identities, commands, past-tense events, read models, automations and translations, compliance subjects, and the specification outline. Use when behavior, event vocabulary, stream boundaries, or a multi-slice flow is not yet…
Skill Claude CodeCodex
Evolve a Chronicle event schema without breaking replay - add a generation and an EventTypeMigration so stored events upcast into the new shape. Use when an event needs a new required property, a renamed or split property, a structural change, or a changed enum value after events of the prior shape already exist. Do…
Skill Claude CodeCodex
Isolate tenants in Chronicle with namespaces - what a namespace actually isolates, how a namespace is selected and resolved through IEventStoreNamespaceResolver, how namespaces come into existence, and the code rules that let a single-tenant deployment grow a second tenant. Use when setting up tenancy, when writing…
Skill Claude CodeCodex
Add Chronicle projection behavior to an existing read model - model-bound attributes first, the fluent IProjectionFor builder when they cannot express the shape. Covers AutoMap, keys, children and nested types, counters, event-sequence selection, and the startup-crash traps. Use when populating a read model from…
Skill Claude CodeCodex
Implement a Chronicle IReactor - an automation that causes an external side effect, or a translation that appends follow-up events. Covers handler dispatch and parameter resolution, every supported return type, targeting another event source, replay handling with [OnceOnly] and [Replay], event filtering, failure and…
Skill Claude CodeCodex
Create a Chronicle read model and its query surface - past-tense event types, the read-model record and its key, choosing a projection or a reducer to build it, snapshot versus observable queries, and reading an instance directly through IReadModels. Use when creating a read model from scratch; for changing how an…
At most 3 mods per repository are shown here, and a mod shipped inside a plugin is left to that plugin's page — the rest are on their repository pages: