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 amadeus-dlc/amadeus --skill ddd-aggregate-designgit clone --depth 1 https://github.com/amadeus-dlc/amadeusWrote 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/amadeus-dlc/amadeus/ddd-aggregate-design)<a href="https://agentmods.dev/skills/amadeus-dlc/amadeus/ddd-aggregate-design"><img src="https://agentmods.dev/badge/skills/amadeus-dlc/amadeus/ddd-aggregate-design/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/amadeus-dlc/amadeus/ddd-aggregate-design"><img src="https://agentmods.dev/badge/skills/amadeus-dlc/amadeus/ddd-aggregate-design.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 | $0.00085 | $0.00382 |
| Opus 5 | $0.00043 | $0.00191 |
| Sonnet 5 | $0.00017 | $0.00076 |
| Haiku 4.5 | $0.00009 | $0.00038 |
Grade A, and why
ddd-aggregate-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 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.
What it actually says
DDD Aggregate Design
An aggregate is a consistency boundary. Design it around true invariants, not object graphs, database tables, or UI screens.
Workflow
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Name the command and business invariant under discussion.
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Decide what must be strongly consistent immediately. Put only that inside one aggregate.
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Choose one aggregate root as the only external entry point.
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Reference other aggregates by ID and coordinate them with events, policies, sagas, or process managers.
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Prefer immutable updates unless the language or framework strongly pushes otherwise.
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Review constructors/factories for complete initialization and invariant protection.
Core Rules
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Design aggregates around true invariants.
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Keep aggregates small.
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Update one aggregate per transaction.
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Never expose mutable child collections or public fields.
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Use domain events for cross-aggregate effects.
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Add optimistic locking only when concurrent updates are a real requirement.
Language References
Read the matching file in references/ for TypeScript, Scala, Rust, or Python implementation patterns.
Detailed Reference
For non-trivial implementation, review, or refactoring work, read references/details.md before giving final guidance. It contains the detailed rules, examples, smells, and migration notes that do not belong in the short invocation body.
Output
Return the boundary decision, invariant list, aggregate root API, event list, transaction model, and concrete code or review findings.
What ships with it
5 files 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.
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 · 50 lines · 85 tokens per session scan A e6102287a085
ddd-aggregate-design is a skill published in the GitHub repository amadeus-dlc/amadeus (8 stars, last pushed 18d ago), licensed Apache-2.0. It adds 85 tokens to every session and 382 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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