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 first-class-collectiongit 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/first-class-collection)<a href="https://agentmods.dev/skills/amadeus-dlc/amadeus/first-class-collection"><img src="https://agentmods.dev/badge/skills/amadeus-dlc/amadeus/first-class-collection.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 | $0.00054 | $0.00310 |
| Opus 5 | $0.00027 | $0.00155 |
| Sonnet 5 | $0.00011 | $0.00062 |
| Haiku 4.5 | $0.00005 | $0.00031 |
Grade A, and why
first-class-collection 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 8d 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
First Class Collection
A first-class collection gives a collection a domain name and keeps collection rules in one place.
Rule
The wrapper should own one collection field and behavior around that collection. Extra unrelated fields usually mean it is an entity or aggregate instead.
Workflow
-
Find repeated collection operations, filters, totals, limits, ordering, or validation.
-
Name the collection as a domain concept.
-
Move rules into methods on the wrapper.
-
Keep the internal collection immutable or defensively copied.
-
Expose intention-revealing operations instead of raw mutation.
Checks
-
Good:
OrderLines.totalAmount(),Members.hasQuorum(). -
Bad: exposing
itemsand expecting callers to remember invariants. -
Avoid wrapping a collection that has no domain behavior.
Reference
Read references/patterns.md for 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 wrapper candidates, APIs, invariants, and migration steps.
What ships with it
2 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.
- 8d ago First seen · 46 lines · 54 tokens per session scan A f0f08a9b868e
first-class-collection is a skill published in the GitHub repository amadeus-dlc/amadeus (8 stars, last pushed 17d ago), licensed Apache-2.0. It adds 54 tokens to every session and 310 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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