fetcher-wow-cqrs git:20260527.808710cA

Immutable. This exact content is served forever at /api/v1/blob/73290f59127ef14c.

---
name: fetcher-wow-cqrs
description: >
  Use when creating Wow DDD and CQRS clients with Fetcher, including CommandClient, SnapshotQueryClient, EventStreamQueryClient, aggregate load clients, QueryClientFactory, command stages and headers, query DSL conditions, generated clients, and pagination types.
---

# fetcher-wow-cqrs

## Use This Skill When

- The task mentions Wow, CQRS, DDD, commands, queries, aggregates, snapshots, or event streams.
- The task needs command sending, command stage waiting, or command headers.
- The task needs snapshot queries, event-stream queries, aggregate state loading, or query factories.
- The task needs the Wow query DSL, pagination, projections, sorting, or generated client patterns.

## Workflow

1. Start from aggregate metadata: service, bounded context, aggregate name, tenant, and owner attribution.
2. Use `CommandClient` for command writes and query clients for read-side access; keep those flows separate.
3. Use `QueryClientFactory` when multiple query clients share the same metadata and attribution path spec.
4. Build query conditions with the DSL instead of ad hoc JSON objects.
5. Load `references/api.md` for constructors, client methods, command stages, query DSL operators, key types, generated clients, and complete flows.

## Key Practices

- Keep command requests explicit about aggregate identity and expected command result behavior.
- Use generated clients when OpenAPI metadata is the source of truth.
- Route generation-time questions to `fetcher-openapi-generator`; keep this skill focused on runtime Wow clients and DSL usage.

## References

- `references/api.md`: Detailed package API, examples, and edge-case guidance. Load it only when the task needs imports, constructors, command APIs, query clients, aggregate load clients, factory setup, query DSL operators, key types, generated clients, and end-to-end examples.

## Related Skills

- $fetcher-openapi-generator: Use to generate Wow CQRS clients from OpenAPI specs.
- $fetcher-viewer-components: Use for table and filter UIs backed by Wow queries.
- $fetcher-react-hooks: Use for React Wow query hooks.