Swiftdata Pro

What it does

When your agent uses it

• Reviewing projects that use SwiftData
• Tasks that involve iOS development

Example prompts

• “/swiftdata-pro”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Check for core SwiftData issues using references/core-rules.md.
2. 2Check that predicates are safe and supported using references/predicates.md.
3. 3If the project uses CloudKit, check for CloudKit-specific constraints using references/cloudkit.md.
4. 4If the project targets iOS 18+, check for indexing opportunities using references/indexing.md.
5. 5If the project targets iOS 26+, check for class inheritance patterns using references/class-inheritance.md.

What it can do on your machine

Read from SKILL.md and the folder at commit b141304. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are swift).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Swiftdata Pro loads about 930 tokens when it runs, and up to ~3.9k if it reads all its reference files. Until then it costs about 41 tokens; SKILL.md has 385 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~41

When it runs · the whole SKILL.md, loaded when a task matches

~930

With references · SKILL.md plus every file in references/, read only if the agent opens them

~3.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from n0an/VivaDicta at commit b141304, republished under its MIT licence (© n0an). 385 words, ~930 tokens.

name

swiftdata-pro

description

Writes, reviews, and improves SwiftData code using modern APIs and best practices. Use when reading, writing, or reviewing projects that use SwiftData.

license

MIT

metadata.author

Paul Hudson

metadata.version

1.0

// Before
var sights: [Sight]

// After
@Relationship(deleteRule: .cascade, inverse: \Sight.destination) var sights: [Sight]

// Before
#Predicate<Destination> { $0.sights.isEmpty == false }

// After
#Predicate<Destination> { !$0.sights.isEmpty }

// Before
class DestinationStore {
    @Query var destinations: [Destination]
}

// After
class DestinationStore {
    var modelContext: ModelContext

    func fetchDestinations() throws -> [Destination] {
        try modelContext.fetch(FetchDescriptor<Destination>())
    }
}

© n0an, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 8 other files (references, assets) in .agents/skills/swiftdata-pro of n0an/VivaDicta.

• SKILL.md
• agents/openai.yaml
• assets/swiftdata-pro-icon.png
• assets/swiftdata-pro-icon.svg
• references/class-inheritance.md
• references/cloudkit.md
• references/core-rules.md
• references/indexing.md
• references/predicates.md

Open the folder on GitHubat commit b141304

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in n0an/VivaDicta, which our catalogue first saw on October 7, 2026.

• twostraws/SwiftData-Agent-Skillswiftdata-pro