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 package-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/package-design)<a href="https://agentmods.dev/skills/amadeus-dlc/amadeus/package-design"><img src="https://agentmods.dev/badge/skills/amadeus-dlc/amadeus/package-design.svg" alt="Measured on agentmods" 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 | $0.00062 | $0.00309 |
| Opus 5 | $0.00031 | $0.00154 |
| Sonnet 5 | $0.00012 | $0.00062 |
| Haiku 4.5 | $0.00006 | $0.00031 |
Grade A, and why
package-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 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.
What it actually says
Package Design
Package design is about controlling change, not arranging files aesthetically.
Workflow
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Identify change reasons: what decisions are likely to vary independently?
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Map current dependencies and cycles.
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Group code by stable domain or technical decisions, not by temporary implementation steps.
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Define public APIs that hide volatile internals.
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Make dependency direction explicit and acyclic.
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Plan migration in small, behavior-preserving moves.
Design Rules
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Put volatile details behind stable interfaces.
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Keep high-level policy independent from low-level mechanisms.
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Prefer feature/domain packages when change reasons are domain-shaped.
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Split large modules only when the split reduces change coupling.
References
Read references/principles.md for design principles and references/rust-patterns.md for Rust-specific layouts.
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 current problems, target package tree, dependency rules, migration steps, and verification commands.
What ships with it
3 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.
- 6d ago First seen · 46 lines · 62 tokens per session scan A 7c7b21d8b69a
package-design is a skill published in the GitHub repository amadeus-dlc/amadeus (8 stars, last pushed 16d ago), licensed Apache-2.0. It adds 62 tokens to every session and 309 once invoked, about $0.0003 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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