ddd

ddd is a skill for Claude Code, Codex from bish-x/bx-dev-skill. It costs 124 tokens per session (12,234 once invoked), scanned A, original, no licence file.

A reference for Domain-Driven Design, a way to shape software around the real business area it serves. It covers dividing a system into clear parts, modeling business rules, and handling older code during gradual replacement.

In plain words
What is it for?
It supports planning bounded contexts, subdomains, aggregates, value objects, repositories, domain events, legacy migration, and translation layers across several technology stacks.
Why use it?
It helps coding agents discuss business boundaries and common design patterns consistently, instead of mixing unrelated rules and responsibilities together.

Skill for Claude CodeCodex

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 skills/bish-x/bx-dev-skill/ddd
Any agent
npx skills add bish-x/bx-dev-skill --skill ddd
Clone the repo
git clone --depth 1 https://github.com/bish-x/bx-dev-skill

Made for: Claude Code, Codex.

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/bish-x/bx-dev-skill/ddd.svg)](https://agentmods.dev/skills/bish-x/bx-dev-skill/ddd)
Your own site
<a href="https://agentmods.dev/skills/bish-x/bx-dev-skill/ddd"><img src="https://agentmods.dev/badge/skills/bish-x/bx-dev-skill/ddd.svg" alt="Measured on agentmods" height="20"></a>
Per session 124 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 12,234 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00124 $0.12234
Opus 5 $0.00062 $0.06117
Sonnet 5 $0.00025 $0.02447
Haiku 4.5 $0.00012 $0.01223

Measured 4d ago against content hash 78671738a4ca, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 4d 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.

skills/bx-dev/skill-library/architecture/ddd/SKILL.md · 848 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 4d ago First seen · 848 lines · 124 tokens per session scan A 78671738a4ca

Subscribe to this mod's changes

ddd is a skill published in the GitHub repository bish-x/bx-dev-skill (23 stars, last pushed 3mo ago), with no licence file. It adds 124 tokens to every session and 12,234 once invoked, about $0.0006 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 2026-08-30.

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