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-domain-primitives-and-always-validgit 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-domain-primitives-and-always-valid)<a href="https://agentmods.dev/skills/amadeus-dlc/amadeus/ddd-domain-primitives-and-always-valid"><img src="https://agentmods.dev/badge/skills/amadeus-dlc/amadeus/ddd-domain-primitives-and-always-valid/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-domain-primitives-and-always-valid"><img src="https://agentmods.dev/badge/skills/amadeus-dlc/amadeus/ddd-domain-primitives-and-always-valid.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 | $0.00329 |
| Opus 5 | $0.00037 | $0.00164 |
| Sonnet 5 | $0.00015 | $0.00066 |
| Haiku 4.5 | $0.00007 | $0.00033 |
Grade A, and why
ddd-domain-primitives-and-always-valid 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 11d 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
Domain Primitives And Always-Valid Models
Make illegal states unrepresentable when the domain rule is stable enough to deserve a type.
Workflow
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Identify primitives that carry domain meaning or repeated validation.
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Separate syntax checks from domain invariants.
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Add a domain primitive with a private constructor and smart constructor or parser.
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Store only valid values inside entities and aggregates.
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Keep formatting, localization, and transport parsing outside the core type unless they are domain rules.
Use A Domain Primitive When
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The value has a domain name.
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Validation appears in multiple places.
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Mixing two values of the same primitive type would be dangerous.
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Behavior belongs with the value.
Avoid Wrapping When
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The value is purely technical, temporary, or has no invariant.
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A wrapper would add ceremony without changing correctness.
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 primitive candidates, chosen wrappers, construction API, error type, and migration steps.
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.
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.
- 11d ago First seen · 46 lines · 75 tokens per session scan A 68f57c7c1fc9
ddd-domain-primitives-and-always-valid is a skill published in the GitHub repository amadeus-dlc/amadeus (8 stars, last pushed 20d ago), licensed Apache-2.0. It adds 75 tokens to every session and 329 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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