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.
npx skills add mickeyyaya/refactoring-skills --skill domain-driven-design-patternsgit clone --depth 1 https://github.com/mickeyyaya/refactoring-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/mickeyyaya/refactoring-skills/domain-driven-design-patterns)<a href="https://agentmods.dev/skills/mickeyyaya/refactoring-skills/domain-driven-design-patterns"><img src="https://agentmods.dev/badge/skills/mickeyyaya/refactoring-skills/domain-driven-design-patterns/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mickeyyaya/refactoring-skills/domain-driven-design-patterns"><img src="https://agentmods.dev/badge/skills/mickeyyaya/refactoring-skills/domain-driven-design-patterns.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00075 | $0.05263 |
| Opus 5 | $0.00037 | $0.02632 |
| Sonnet 5 | $0.00015 | $0.01053 |
| Haiku 4.5 | $0.00007 | $0.00526 |
Grade A, and why
domain-driven-design-patterns 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 604 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Domain-Driven Design Patterns
Overview
Domain-Driven Design (DDD) aligns the software model with the business domain. The goal is code that domain experts can read, invariants enforced at the model boundary, and explicit seams between subsystems that evolve independently.
When to use: Designing a new bounded context; reviewing a domain model for anemia or leaking invariants; evaluating how two services should integrate; any time business rules are scattered across service layers instead of living in the domain.
Quick Reference
| Pattern | Core Idea | Primary Red Flag |
|---|---|---|
| Bounded Context | Explicit boundary around a coherent domain model | Same concept named differently in two subsystems with no translation layer |
| Context Mapping | Named relationship between bounded contexts | Direct DB joins across context boundaries; shared mutable tables |
| Aggregate Root | Cluster of objects treated as one unit for writes | Direct mutation of child entities bypassing the root |
| Value Object | Immutable, identity-free; equality by attributes | Mutable DTO used as a domain concept; comparing Money by reference |
| Entity | Mutable over time; identity by ID | Equality checked by comparing all fields instead of ID |
| Domain Event | Fact that something happened in the domain | Calling another context's service directly; tight coupling across contexts |
| Ubiquitous Language | Single shared vocabulary between devs and domain experts | Code uses user where the domain says member; translation scattered everywhere |
| Repository (DDD) | Collection-oriented abstraction over persistence | UserRepository.findActiveByEmailSortedByLoginDesc — query leaks into domain |
| Domain Service | Stateless operation that does not belong to one entity | Business logic living in application/controller layers |
| Application Service | Orchestrates use cases; no domain logic | Domain invariants enforced in a controller or middleware |
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.
- 9d ago First seen · 604 lines · 75 tokens per session scan A 051217169d26
domain-driven-design-patterns is a skill published in the GitHub repository mickeyyaya/refactoring-skills (6 stars, last pushed 5mo ago), licensed MIT. It adds 75 tokens to every session and 5,263 once invoked, about $0.0004 per session on Opus 5. 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.
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