Implement, review, or improve data persistence using SwiftData.

Custom licenceAuto-check passedMobile

Install Swiftdata

skills CLI
$ npx skills add dpearson2699/swift-ios-skills --skill swiftdata -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install dpearson2699/swift-ios-skills swiftdata --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/dpearson2699/swift-ios-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/swiftdata .claude/skills/swiftdata && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
swiftdata
GitHub stars
1.2k
Token cost
~3.9k tokens
SKILL.md length
823 words
Files
7 (incl. references)
Skills in repo
86
Repo updated
First seen
Licence
Custom licence

At a glance

Implement, review, or improve data persistence using SwiftData.

  • Defining @Model classes with @Attribute
  • SKILL.md covers Contents, Model Definition, ModelContainer Setup and CloudKit Sync, plus 11 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Querying with @Query

What it does

Swiftdata is an agent skill from dpearson2699/swift-ios-skills. Implement, review, or improve data persistence using SwiftData. Use when defining @Model classes with @Attribute, @Relationship, @Transient, Unique, or Index; when querying with @Query, Predicate, FetchDescriptor, or SortDescriptor; when configuring ModelContainer and ModelContext for SwiftUI or background work with @ModelActor; when planning schema migrations with VersionedSchema and SchemaMigrationPlan; when setting up CloudKit sync with ModelConfiguration; or when coexisting with or migrating from Core Data.

Its SKILL.md is about 3.9k tokens, which your agent loads only when the skill is triggered. The skill folder holds 8 other files, including reference files (for example `evals/evals.json`, `references/core-data-coexistence.md` and `references/indexing.md`).

It sits in Mobile, covering iOS development and Database migrations. It works with SwiftUI and iOS. The repository describes itself as: Agent Skills for iOS 26+, Swift 6.3, SwiftUI, and modern Apple frameworks.

When your agent uses it

  • Defining @Model classes with @Attribute
  • Querying with @Query
  • FetchDescriptor
  • Configuring ModelContainer and ModelContext for SwiftUI

Example prompts

  • “/swiftdata”

What it can do on your machine

Read from SKILL.md and the folder at commit 8d90fd1. 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 loads about 3.9k tokens when it runs, and up to ~19k if it reads all its reference files. Until then it costs about 132 tokens; SKILL.md has 823 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~132
When it runs · the whole SKILL.md, loaded when a task matches
~3.9k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~19k

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

Auto-check passed

The automated check found no risky patterns in SKILL.md.

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 823 words (~3,933 tokens).

“Persist, query, and manage structured data in iOS 26+ apps using SwiftData with Swift 6.3.”

— opening of SKILL.md by dpearson2699, Custom licence
name
swiftdata

Read the full SKILL.md on GitHub

Files

SKILL.md and 6 other files (references) in skills/swiftdata of dpearson2699/swift-ios-skills.

  • SKILL.md
  • evals/evals.json
  • references/core-data-coexistence.md
  • references/indexing.md
  • references/predicate-pitfalls.md
  • references/swiftdata-advanced.md
  • references/swiftdata-queries.md

Open the folder on GitHubat commit 8d90fd1

Compare with similar skills

Swiftdata next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Swiftdata compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Swiftdata this skilldpearson2699/swift-ios-skills1.2k—~3.9kAutomated safety check: PassCustom licence
Swiftui Expert SkillAvdLee/SwiftUI-Agent-Skill3.7k—~2.9kAutomated safety check: PassMIT
Swiftui Expert SkillEslzzyl/Pixiv-SwiftUI1115 repos~3.1kAutomated safety check: PassAGPL-3.0
Swiftui Liquid Glassharperreed/dotfiles3348 repos~941Automated safety check: PassNone
Update Swiftui APIsAvdLee/SwiftUI-Agent-Skill3.7k—~1.2kAutomated safety check: PassMIT
Hig Project Contextraintree-technology/hig-doctor1425 repos~1.2kAutomated safety check: PassMIT

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Works with

Categories

Questions about Swiftdata

What does Swiftdata do?

Implement, review, or improve data persistence using SwiftData. Swiftdata is an agent skill from dpearson2699/swift-ios-skills. Implement, review, or improve data persistence using SwiftData.

When should I use Swiftdata?

Swiftdata fits situations like: defining @Model classes with @Attribute; querying with @Query; fetchDescriptor; configuring ModelContainer and ModelContext for SwiftUI.

How do I install Swiftdata in Claude Code?

Run `npx skills add dpearson2699/swift-ios-skills --skill swiftdata -a claude-code`. Or copy the skill folder (skills/swiftdata in dpearson2699/swift-ios-skills) into .claude/skills/swiftdata in your project. Claude Code loads it when a task matches its description.

How do I install Swiftdata in Codex?

Run `npx skills add dpearson2699/swift-ios-skills --skill swiftdata -a codex`. Or copy the skill folder (skills/swiftdata in dpearson2699/swift-ios-skills) into .agents/skills/swiftdata in your project. Codex loads it when a task matches its description.

Can I use Swiftdata in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add dpearson2699/swift-ios-skills --skill swiftdata -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/swiftdata, .gemini/skills/swiftdata, .github/skills/swiftdata and .opencode/skills/swiftdata in your project.

What does Swiftdata need to run?

SKILL.md names no scripts, command-line tools or credentials: Swiftdata is instructions for the agent only.

Does Swiftdata access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Swiftdata safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Swiftdata use?

Swiftdata has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Swiftdata use?

About 3.9k tokens (SKILL.md is roughly 16k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 15k tokens, read only when the agent opens those files.

What are the alternatives to Swiftdata?

Skills that share tags, products or a category with Swiftdata: Swiftui Expert Skill (AvdLee/SwiftUI-Agent-Skill, 3.7k stars), Swiftui Expert Skill (Eslzzyl/Pixiv-SwiftUI, 111 stars), Swiftui Liquid Glass (harperreed/dotfiles, 334 stars) and Update Swiftui APIs (AvdLee/SwiftUI-Agent-Skill, 3.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Swiftdata?

dpearson2699 (a GitHub user) maintains it in dpearson2699/swift-ios-skills, which has 1,173 GitHub stars. The repository holds 86 skills in this directory. The repository was last updated on July 31, 2026.

Source: dpearson2699/swift-ios-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.