ddd

ddd is a skill for Claude Code from P47Phoenix/Claude-Plugins. It costs 0 tokens per session (788 once invoked), scanned A, original, MIT.

A software-design guide based on Domain-Driven Design, a way to shape software around a business domain and its language. It helps identify business areas, boundaries, and the right level of investment for each one.

In plain words
What is it for?
Use it to break down a business domain, classify subdomains as core, supporting, or generic, discover bounded contexts, and design clearer system boundaries.
Why use it?
It reduces confusion when the same terms mean different things in different parts of a business. It also helps teams decide what deserves custom engineering and what can use an existing solution.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: model in frontmatter.

Part of the delivery-team plugin — 17 skills shipped together

Good fit Use it to break down a business domain, classify subdomains as core…

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/p47phoenix/claude-plugins/ddd
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.

Any agent
npx skills add P47Phoenix/Claude-Plugins --skill ddd
Clone the repo
git clone --depth 1 https://github.com/P47Phoenix/Claude-Plugins

Made for: Claude Code.

Or install delivery-team, the plugin that ships this one along with the rest of its 17 skills.

Wrote 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.

agentmods badge for ddd

README.md
[![agentmods](https://agentmods.dev/badge/skills/p47phoenix/claude-plugins/ddd.svg)](https://agentmods.dev/skills/p47phoenix/claude-plugins/ddd)
Your own site
<a href="https://agentmods.dev/skills/p47phoenix/claude-plugins/ddd"><img src="https://agentmods.dev/badge/skills/p47phoenix/claude-plugins/ddd.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 788 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00000 $0.00788
Opus 5 $0.00000 $0.00394
Sonnet 5 $0.00000 $0.00158
Haiku 4.5 $0.00000 $0.00079

Measured 6d ago against content hash 37d3bb1e8a45, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

ddd 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 6d 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.

delivery-team/skills/architect/paradigms/ddd/SKILL.md · 87 lines

How it starts

The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Strategic Domain-Driven Design

You are a Solution Architect specializing in Strategic DDD following Eric Evans' and Martin Fowler's process. Apply these principles to every decomposition and design task.

Core Principle

DDD is an iterative modeling process where deep domain understanding drives architectural decisions. The sequence matters -- never skip to context mapping without knowledge crunching first.

Subdomain Classification

Subdomain Definition Investment Build vs Buy
Core Competitive advantage -- what makes the business unique Invest heavily, best developers, deep modeling Always build
Supporting Necessary but not differentiating Moderate investment Build or configurable platform
Generic Commodity -- everyone does it the same Minimize investment Buy, SaaS, open source

Classification informs investment: core subdomains deserve full tactical DDD patterns; generic subdomains need no modeling at all.

Bounded Context Discovery

Boundaries appear where language and model change. Discovery signals:

  • Same word, different meaning -- "Account" in billing vs authentication
  • Different words, same concept -- Sales says "deal", Support says "ticket"
  • Awkward compound names -- "ShippingCustomer" vs "BillingCustomer" means you are crossing a boundary

Boundary Rules

  • If two concepts MUST be consistent in the same transaction -> same context
  • If they can be eventually consistent -> candidate for different contexts
  • Start broad: fewer, larger contexts. Split only when complexity demands it.

Context Mapping Patterns

Pattern When to Use
Shared Kernel Close collaboration, small well-defined overlap
Customer-Supplier Clear dependency, upstream prioritizes downstream
Conformist No leverage over upstream (external API)
Anti-Corruption Layer Incompatible models, need isolation from changes
Open Host Service Multiple consumers, stable versioned API
Published Language Industry standards (EDI, HL7, FHIR, OpenAPI)
Partnership Mutual dependency, coordinated releases
Separate Ways Integration cost exceeds benefit

Read the full file on GitHub · 87 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 6d ago First seen · 87 lines · 0 tokens per session scan A 37d3bb1e8a45

Subscribe to this mod's changes

ddd is a skill published in the GitHub repository P47Phoenix/Claude-Plugins (2 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 788 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.

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