trogonstack/trogonstack-eventmodeling

Step 6 of Event Modeling - Apply Conway's Law with swimlanes. Organize events into autonomous system parts that different teams can independently own. Use after defining inputs/outputs. Do not use for: planning feature slice implementation order (use eventmodeling-slicing-event-models) or defining command/read model boundaries (use eventmodeling-designing-event-models).

Step 1 of Event Modeling - Brainstorm all domain events from requirements. Extract every state-changing event the system could have. Use when starting event modeling from requirements or a new domain. Do not use for: arranging events in sequence (use eventmodeling-plotting-events), designing commands or read models (use eventmodeling-designing-event-models), or when a complete event list already exists.

Step 8 of Event Modeling - Completeness Check. Verify every field has origin and destination. Ensure complete event model before code generation. Use after all scenarios defined. Do not use for: architectural validation against event sourcing principles (use eventmodeling-validating-event-models) or elaborating Given-When-Then specs (use eventmodeling-elaborating-scenarios).

Designs event-sourced domain models. Maps business processes to immutable events and state projections. Events are the source of truth; state is derived from events for command validation. Use when designing event streaming architectures from domain analysis. Do not use for: brainstorming events from scratch (use eventmodeling-brainstorming-events), optimizing stream sizing or snapshotting (use eventmodeling-optimizing-stream-design), or translating external system events (use eventmodeling-translating-external-events).

Step 7 of Event Modeling - Elaborate scenarios using Given-When-Then format. Specify behavior of commands and views. Each spec tied to exactly one command or view. Use after defining systems and boundaries. Do not use for: architectural validation (use eventmodeling-validating-event-models) or verifying field completeness across the model (use eventmodeling-checking-completeness).

Step 4 of Event Modeling - Identify Commands/Inputs from UI and Processor actions. Map user actions to commands and data. Use after storyboarding UI. Do not use for: identifying read models or outputs (use eventmodeling-identifying-outputs) or elaborating behavior specifications (use eventmodeling-elaborating-scenarios).

Step 5 of Event Modeling - Identify Outputs/Read Models from events. Show what data flows back to UI and Processors. Use after defining inputs. Do not use for: identifying commands or inputs (use eventmodeling-identifying-inputs) or verifying field completeness (use eventmodeling-checking-completeness).

Apply Event Modeling to legacy systems using side-car pattern. Freeze old system, extract events, build new features without rewriting. Use when modernizing legacy applications. Do not use for: greenfield systems without existing legacy constraints (use eventmodeling-orchestrating-event-modeling) or translating inbound events from external APIs (use eventmodeling-translating-external-events).

Design event streams with proper stream identity to keep streams appropriately sized, avoid unnecessary snapshotting, and balance performance with simplicity. Use when concerned about stream length, planning performance, or validating stream design before implementation. Do not use for: designing the initial event model structure (use eventmodeling-designing-event-models) or general architectural validation (use eventmodeling-validating-event-models).

Orchestrates complete event modeling workflow from requirements to code generation. Models architecture as UI/Processor → Command → Event → Read Model. Use when modeling a domain end-to-end from requirements. Do not use for: executing a single step in isolation (invoke the named step skill directly, e.g., eventmodeling-brainstorming-events for Step 1 or eventmodeling-elaborating-scenarios for Step 7), validating an already-completed model (use eventmodeling-validating-event-models), or modernizing legacy systems (use eventmodeling-integrating-legacy-systems).

Step 2 of Event Modeling - Arrange events chronologically in logical narrative sequence. Create timeline showing event flow and dependencies. Use after brainstorming events. Do not use for: brainstorming new events (use eventmodeling-brainstorming-events) or designing command/read model architecture (use eventmodeling-designing-event-models).

Break down complete event models into independently implementable feature slices, identify dependencies, and plan parallel implementation across teams. Use when planning team allocation, identifying MVP scope, or establishing implementation order after completing event modeling. Do not use for: organizational team structure based on Conway's Law (use eventmodeling-applying-conways-law) or planning before the event model is complete (complete the full model first using eventmodeling-orchestrating-event-modeling).

Step 3 of Event Modeling - Create UI storyboards/mockups showing what users see at each step. Capture all data fields needed from user perspective. Use after sequencing events. Do not use for: identifying commands or processor actions (use eventmodeling-identifying-inputs) or designing read models (use eventmodeling-identifying-outputs).

Translate external system events (webhooks, APIs, IoT) into domain events. Map technical data to business concepts. Use when integrating with external systems that emit events your domain needs to react to. Do not use for: modernizing legacy systems using the side-car pattern (use eventmodeling-integrating-legacy-systems) or designing command handlers for the translated events (use eventmodeling-designing-event-models).

Step 9 of Event Modeling - Validate event-sourced models for completeness, consistency, and event sourcing principles. Ensures events are immutable facts, state projections are deterministic, and commands are pure. Identifies gaps and suggests improvements before code generation. Use when reviewing models before code generation. Do not use for: the structured 23-check production checklist (use eventmodeling-validating-event-models-checklist) or field-level completeness verification (use eventmodeling-checking-completeness).

Validate event-sourced CQRS models against 16 architectural checks across 7 phases. Identifies anti-patterns and confirms compliance with event sourcing principles. Use when reviewing event models for production readiness or after completing event modeling steps. Do not use for: reviewing incomplete or in-progress models (use eventmodeling-validating-event-models), or for elaborating new scenarios (use eventmodeling-elaborating-scenarios).