Domain Service Standard

Executive Summary

Domain services hold domain behavior that does not naturally belong to one aggregate, entity, or value object.

Responsibilities

Responsibility	Requirement
Domain behavior	Encapsulates business logic using Domain language.
Policy support	Supports domain policies, eligibility, scoring, or decision rules.
Invariant protection	Helps enforce invariants across related objects owned by the module.
Event production	May produce domain events when a business fact happens.

Rules

Rule	Requirement
Stay module-local	Domain services are not shared across modules.
Do not orchestrate workflows	Workflow orchestration belongs to application services or process components.
Do not access other repositories	Domain services cannot read or write another module's persistence.
Use Domain language	Service names and methods should reflect business language, not technical tasks.

Examples

Module	Domain Service Example Area
organization	Organization eligibility or tenant activation rules.
compliance	Compliance readiness scoring or evidence validation rules.
opportunity	Opportunity matching and qualification rules.
bid	Bid readiness and submission risk rules.
intelligence	AI reasoning acceptance and memory eligibility rules.