ddd-analysis

ddd-analysis is a skill for Claude Code from testdouble/han. It costs 154 tokens per session (6,800 once invoked), scanned A, original, MIT.

A codebase analysis for Domain-Driven Design (DDD), an approach that models software around the business problems it solves. It identifies business terms, related areas of responsibility, and where the code structure differs from those areas.

In plain words
What is it for?
Use it to map business areas, clarify shared language, find conflicting meanings, and document proposed boundaries between parts of an existing system.
Why use it?
It helps reveal when the same word means different things in different parts of a system, or when code boundaries do not match business boundaries. The result is based on evidence from the repository.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions CLAUDE.md.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the han-ddd plugin — 1 skill, 6 agents shipped together

Good fit Use it to map business areas, clarify shared language, find conflicting meanings, and document proposed boundaries between parts of an existing system.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add testdouble/han
Claude Code
/plugin install han-ddd

Made for: Claude Code.

Or install han-ddd, the plugin that ships this one along with the rest of its 1 skill, 6 agents.

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-analysis

README.md
[![agentmods](https://agentmods.dev/badge/skills/testdouble/han/ddd-analysis/github.svg)](https://agentmods.dev/skills/testdouble/han/ddd-analysis)
Your own site
<a href="https://agentmods.dev/skills/testdouble/han/ddd-analysis"><img src="https://agentmods.dev/badge/skills/testdouble/han/ddd-analysis/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.

agentmods 80×15 button for ddd-analysis

Your own site · 80×15
<a href="https://agentmods.dev/skills/testdouble/han/ddd-analysis"><img src="https://agentmods.dev/badge/skills/testdouble/han/ddd-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 154 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,800 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 $0.00154 $0.06800
Opus 5.5 $0.00062 $0.02720
Sonnet 5.5 $0.00031 $0.01360
Haiku 4.5 $0.00015 $0.00680

Measured 1mo ago against content hash 009400943c2c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ddd-analysis 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 1mo 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.

han-ddd/skills/ddd-analysis/SKILL.md · 461 lines

How it starts

The opening of the file, as written. The whole thing — 461 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Project Context

  • git installed: !which git 2>/dev/null || echo "not installed"
  • CLAUDE.md: !find . -maxdepth 1 -name "CLAUDE.md" -type f
  • project-discovery.md: !find . -maxdepth 3 -name "project-discovery.md" -type f
  • personal config directory: !bash "${CLAUDE_PLUGIN_ROOT}/scripts/han-config-dir.sh" 2>/dev/null || echo "$HOME/.claude"
  • project .han/config.md: !cat .han/config.md 2>/dev/null || echo ""

As your first action, use the Read tool on .han/config.md inside the personal config directory path above. A read that returns no file is no personal configuration: continue silently. When that file or the project .han/config.md probe supplies content, apply it per config-rule.md, which governs precedence between the two files, relative-path resolution, and what to do with a file that reads but cannot be used.

Operating Principles

Read these before dispatching anything. They constrain every step below.

  • The entire repository is a valid scope. No focus area is required. If the user names a module or directory, restrict the analysis to it; otherwise, scope is the full repository. Do not ask for a focus area when none was given.
  • Discovery and context model only. No migration plans. This skill characterizes what the domain structure is. It does not produce recommendations for service splits, migration steps, or refactoring work. When the context model surfaces a decision the team wants to act on, the right next step is han-planning:plan-a-feature (to specify a change) or han-coding:architectural-analysis (for a code-level view of a specific module). The context model informs those steps; it does not replace them.
  • Analysis surface partitions organize agent work, not context proposals. The inventory step identifies tractable areas for structural and behavioral analysis. These partitions are analytical conveniences — they must never be mentioned in any agent brief as context candidates or suggested boundaries.
  • The agents own the judgment; the skill orchestrates. The skill resolves scope, surveys the surface, classifies depth, briefs the agents, collects their output, and renders the report. It does not produce DL#, CAP#, OWN#, S#, B#, or BCM# findings itself.
  • Negative results are valuable. A module with no domain events and only CRUD operations is evidence, not a gap. Agents must not fabricate findings to fill sections.
  • Exactly one revision loop. The skill dispatches bounded-context-modeler, then bounded-context-critic, then bounded-context-modeler once more with the critique. The loop is closed after the revision pass. The skill does not self-escalate or repeat this cycle.
  • The report template lives at references/ddd-analysis-report-template.md. The skill renders that template by synthesizing agent output into each section following the template's placeholder instructions. It does not invent a structure inline.
  • The synthesized prose is written for a named reader. As the skill writes each section, it invokes han-communication:readability-guidance and applies the shared standard, holding one audience above the writing: the engineer or product manager reading the context model and deciding what to do next.

Read the full file on GitHub · 461 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. 1mo ago First seen · 461 lines · 154 tokens per session scan A 009400943c2c

Subscribe to this mod's changes

ddd-analysis is a skill published in the GitHub repository testdouble/han (304 stars, last pushed today), licensed MIT. It adds 154 tokens to every session and 6,800 once invoked, about $0.0006 per session on Opus 5.5. 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 2026-09-16.

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