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Agent skill

Migration Patterns

by gustavscirulis in gustavscirulis/snapgrid

Migration guides for CoreData to SwiftData, UIKit to SwiftUI, ObservableObject to @Observable, XCTest to Swift Testing, Objective-C to Swift, and StoreKit 1 to StoreKit 2.

Custom licenceAuto-check passedMobile

Install Migration Patterns

skills CLI
$ npx skills add gustavscirulis/snapgrid --skill migration-patterns -a claude-code

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

GitHub CLI
$ gh skill install gustavscirulis/snapgrid migration-patterns --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/gustavscirulis/snapgrid.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/skills/ios/migration-patterns .claude/skills/migration-patterns && 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
migration-patterns
GitHub stars
117
Used in
1 other repo
Token cost
~1.7k tokens
SKILL.md length
563 words
Files
7
Skills in repo
120
Repo updated
First seen
Licence
Custom licence

At a glance

Migration guides for CoreData to SwiftData, UIKit to SwiftUI, ObservableObject to @Observable, XCTest to Swift Testing, Objective-C to Swift, and StoreKit 1 to StoreKit 2.

  • Works in 4 steps: Assess the Migration → Load Relevant Reference File → Review the User's Code → …
  • Migrating between Apple framework generations
  • SKILL.md covers When This Skill Activates, Decision Tree, Quick Reference and Process, plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Migration Patterns is an agent skill from gustavscirulis/snapgrid. Migration guides for CoreData to SwiftData, UIKit to SwiftUI, ObservableObject to @Observable, XCTest to Swift Testing, Objective-C to Swift, and StoreKit 1 to StoreKit 2. Use when migrating between Apple framework generations.

Its SKILL.md is about 1.7k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files (for example `coredata-to-swiftdata.md`, `objc-to-swift.md` and `observable-migration.md`).

It sits in Mobile, covering iOS development. It works with Objective-C, SwiftUI and iOS. The repository describes itself as: SnapGrid is an open-source Mac app for collecting, organizing, and analyzing UI screenshots. It uses AI to automatically detect UI components and patterns, making it a powerful…

When your agent uses it

  • Migrating between Apple framework generations
  • Tasks that involve iOS development

Example prompts

  • “/migration-patterns”

Requirements

  • Pre-approved tools (allowed-tools): Read, Glob, Grep

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Assess the Migration
  2. Load Relevant Reference File
  3. Review the User's Code
  4. Recommend a Migration Strategy

What it can do on your machine

Read from SKILL.md and the folder at commit eb7eaf4. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Glob
    • Grep

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

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

  • Network

    Links to these hosts (documentation or services it may open):

    • developer.apple.com

    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

Migration Patterns loads about 1.7k tokens when it runs. Until then it costs about 62 tokens; SKILL.md has 563 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~62
When it runs · the whole SKILL.md, loaded when a task matches
~1.7k

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 563 words (~1,653 tokens).

“Comprehensive guides for migrating between Apple framework generations. Each guide covers the full before/after mapping, coexistence strategies, and common pitfalls.”

— opening of SKILL.md by gustavscirulis, Custom licence
name
migration-patterns
allowed-tools
Read, Glob, Grep

Read the full SKILL.md on GitHub

Files

SKILL.md and 6 other files in .claude/skills/skills/ios/migration-patterns of gustavscirulis/snapgrid.

  • SKILL.md
  • coredata-to-swiftdata.md
  • objc-to-swift.md
  • observable-migration.md
  • storekit-migration.md
  • uikit-to-swiftui.md
  • xctest-to-swift-testing.md

Open the folder on GitHubat commit eb7eaf4

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 gustavscirulis/snapgrid, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Migration Patterns 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.

Migration Patterns compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Migration Patterns this skillgustavscirulis/snapgrid1171 repos~1.7kAutomated safety check: PassCustom licence
Audit Xcode Security Settingssuperagents-lab/xcode27-skills337—~4.6kAutomated safety check: PassNone
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

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Works with

Categories

Questions about Migration Patterns

What does Migration Patterns do?

Migration guides for CoreData to SwiftData, UIKit to SwiftUI, ObservableObject to @Observable, XCTest to Swift Testing, Objective-C to Swift, and StoreKit 1 to StoreKit 2. Migration Patterns is an agent skill from gustavscirulis/snapgrid. Migration guides for CoreData to SwiftData, UIKit to SwiftUI, ObservableObject to @Observable, XCTest to Swift Testing, Objective-C to Swift, and StoreKit 1 to StoreKit 2.

When should I use Migration Patterns?

Migration Patterns fits situations like: migrating between Apple framework generations; tasks that involve iOS development.

How do I install Migration Patterns in Claude Code?

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

How do I install Migration Patterns in Codex?

Run `npx skills add gustavscirulis/snapgrid --skill migration-patterns -a codex`. Or copy the skill folder (.claude/skills/skills/ios/migration-patterns in gustavscirulis/snapgrid) into .agents/skills/migration-patterns in your project. Codex loads it when a task matches its description.

Can I use Migration Patterns 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 gustavscirulis/snapgrid --skill migration-patterns -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/migration-patterns, .gemini/skills/migration-patterns, .github/skills/migration-patterns and .opencode/skills/migration-patterns in your project.

What does Migration Patterns need to run?

SKILL.md names no scripts, command-line tools or credentials: Migration Patterns is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Glob, Grep.

Does Migration Patterns access the network?

SKILL.md names 1 domain. As links in the text: developer.apple.com. This is read from the text; nothing was executed.

Is Migration Patterns 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 Migration Patterns use?

Migration Patterns 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 Migration Patterns use?

About 1.7k tokens (SKILL.md is roughly 6.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Migration Patterns?

Skills that share tags, products or a category with Migration Patterns: Audit Xcode Security Settings (superagents-lab/xcode27-skills, 337 stars), Swiftui Expert Skill (AvdLee/SwiftUI-Agent-Skill, 3.7k stars), Swiftui Expert Skill (Eslzzyl/Pixiv-SwiftUI, 111 stars) and Swiftui Liquid Glass (harperreed/dotfiles, 334 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Migration Patterns?

gustavscirulis (a GitHub user) maintains it in gustavscirulis/snapgrid, which has 117 GitHub stars. The repository holds 120 skills in this directory. The repository was last updated on April 30, 2026.

Source: gustavscirulis/snapgrid on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.