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 The-Artificer-of-Ciphers-LLC/skills-from-the-artificer --skill swiftdatagit clone --depth 1 https://github.com/The-Artificer-of-Ciphers-LLC/skills-from-the-artificerWrote 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/the-artificer-of-ciphers-llc/skills-from-the-artificer/swiftdata)<a href="https://agentmods.dev/skills/the-artificer-of-ciphers-llc/skills-from-the-artificer/swiftdata"><img src="https://agentmods.dev/badge/skills/the-artificer-of-ciphers-llc/skills-from-the-artificer/swiftdata/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/the-artificer-of-ciphers-llc/skills-from-the-artificer/swiftdata"><img src="https://agentmods.dev/badge/skills/the-artificer-of-ciphers-llc/skills-from-the-artificer/swiftdata.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 | $0.00106 | $0.03496 |
| Opus 5.5 | $0.00042 | $0.01398 |
| Sonnet 5.5 | $0.00021 | $0.00699 |
| Haiku 4.5 | $0.00011 | $0.00350 |
Grade A, and why
swiftdata scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
let trips = try modelContext.fetch(FetchDescriptor<Trip>( How it starts
The opening of the file, as written. The whole thing — 356 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SwiftData
Persist, query, and manage structured data in iOS 26+ apps using SwiftData with Swift 6.3.
Contents
- Model Definition
- ModelContainer Setup
- CloudKit Sync
- CRUD Operations
@Query in SwiftUI- #Predicate
- FetchDescriptor
- Schema Versioning and Migration
- Concurrency (
@ModelActor) - SwiftUI Integration
- Common Mistakes
- Review Checklist
- References
Model Definition
Apply @Model to a class (not struct). Generates PersistentModel, Observable, Sendable.
@Model
class Trip {
var name: String
var destination: String
var startDate: Date
var endDate: Date
var isFavorite: Bool = false
@Attribute(.externalStorage) var imageData: Data?
@Relationship(deleteRule: .cascade, inverse: \LivingAccommodation.trip)
var accommodation: LivingAccommodation?
@Transient var isSelected: Bool = false // Always provide default
init(name: String, destination: String, startDate: Date, endDate: Date) {
self.name = name; self.destination = destination
self.startDate = startDate; self.endDate = endDate
}
}
@Attribute options: .externalStorage, .unique, .spotlight, .allowsCloudEncryption, .preserveValueOnDeletion (iOS 18+), .ephemeral, .transformable(by:). Rename: @Attribute(originalName: "old_name").
@Relationship: deleteRule: .cascade/.nullify(default)/.deny/.noAction. Specify inverse: for reliable behavior. Unidirectional (iOS 18+): inverse: nil.
#Unique (iOS 18+): #Unique<Person>([\.firstName, \.lastName]) -- compound uniqueness.
Inheritance (iOS 26+): @Model class BusinessTrip: Trip { var company: String }.
Supported types: Bool, Int/UInt variants, Float, Double, String, Date, Data, URL, UUID, Decimal, Array, Dictionary, Set, Codable enums, Codable structs and other compatible Codable value types, and relationships to @Model classes.
What ships with it
6 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 · 356 lines · 106 tokens per session scan A 396a896951aa
swiftdata is a skill published in the GitHub repository The-Artificer-of-Ciphers-LLC/skills-from-the-artificer (6 stars, last pushed 7d ago), licensed MIT. It adds 106 tokens to every session and 3,496 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-15.
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