002-domain-driven-design

A set of Domain-Driven Design rules for modeling software around real business concepts and processes. Domain-Driven Design is an approach that keeps code closely aligned with how a business works.

In plain words
What is it for?
It guides domain terminology, business rules, entities, value objects, events, and boundaries between different business areas.
Why use it?
It reduces confusion caused by inconsistent names, mixed business concepts, and models that reflect technical details instead of business needs.

Cursor rule for Cursor

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/cmnemoi/cursor-rules/002-domain-driven-design
Clone the repo
git clone --depth 1 https://github.com/cmnemoi/cursor-rules

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 387 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00387
Opus 5 $0.00000 $0.00193
Sonnet 5 $0.00000 $0.00077
Haiku 4.5 $0.00000 $0.00039

Measured 2d ago against content hash 6e03f7850c60, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

002-domain-driven-design scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

emush/.cursor/rules/002-domain-driven-design.mdc · 57 lines

What it actually says

Domain-Driven Design Standards

1.0.0

Context

  • These rules apply to the modeling of business domains
  • They ensure software accurately reflects business concepts and processes
  • They promote a shared understanding between technical and domain experts
  • Reflect business needs in the code.
  • Avoid technical function names, favor domain language

Requirements

Ubiquitous Language

  • Use consistent terminology across code, documentation, and communication
  • Name classes, methods, and variables according to the domain language
  • Document domain terms in a glossary
  • Avoid technical jargon in domain models

Bounded Contexts

  • Identify and define clear boundaries between different domain areas
  • Create explicit context maps to document relationships between contexts
  • Use different models for the same concept in different contexts when appropriate
  • Implement proper integration patterns between bounded contexts

Domain Models

  • Model entities with identity and continuity
  • Model value objects for concepts defined by their attributes
  • Implement aggregates to enforce consistency boundaries
  • Use domain events to represent state changes

Business Rules

  • Encapsulate business rules within domain entities and value objects
  • Implement domain services for operations that don't belong to entities
  • Use specifications to encapsulate complex query logic
  • Validate business rules at the domain level

Architecture

  • Implement a layered architecture with the domain model at the core
  • Keep domain logic free from infrastructure concerns
  • Use repositories to abstract data access
  • Implement factories for complex object creation

Critical Rules

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 57 lines · 387 tokens per session scan A 6e03f7850c60

Subscribe to this mod's changes

002-domain-driven-design is a cursor rule published in the GitHub repository cmnemoi/cursor-rules (2 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 387 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.