swiftdata-core-data-migrations SKILL.md skillA
swiftdata-core-data-migrations from fal3/claude-skills-collection is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add fal3/claude-skills-collection/swiftdata-core-data-migrations@git:20260917.7201e74Pins git:20260917.7201e74 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- fal3/claude-skills-collection
- Path
skills/swiftdata-core-data-migrations/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260917.7201e74, committed Sep 17, 2026
- First version recorded
- Aug 14, 2026
- Size
- 9,230 bytes
- Repository stars
- 20
- License
- MIT
Design, implement, diagnose, and test production schema migrations for SwiftData and Core Data, including VersionedSchema snapshots, SchemaMigrationPlan stages, lightweight and custom Core Data mappings, gradual adoption, CloudKit constraints, and forward-recovery planning. Use when a persistent model changes, an existing store must upgrade without data loss, a team is choosing between SwiftData and Core Data for migration requirements, or copied production stores need validation. Do not use…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# SwiftData and Core Data Migrations Protect the user's existing store first. Select the persistence and migration mechanism from requirements and the installed base, not from framework novelty. ## Inspect before designing Identify every supported source version, store configuration, target, and sync mode before editing models. ```bash xcodebuild -version xcrun swiftc --version xcodebuild -showBuildSettings -project App.xcodeproj -target App \ | rg 'IPHONEOS_DEPLOYMENT_TARGET|MACOSX_DEPLOYMENT_TARGET|SWIFT_VERSION' rg --files | rg '\.(xcdatamodel|xcdatamodeld|mom|momd)$|\.entitlements$|\.storekit$' rg -n 'VersionedSchema|SchemaMigrationPlan|MigrationStage|ModelContainer|NSPersistent(Container|CloudKitContainer)|NSMigrationManager' ``` Record: - Current and historical SwiftData schemas or `.xcdatamodel` versions. - Persistent-store URLs, configurations, App Group use, and SQLite sidecars. - Minimum OS for the app, extensions, tests, and packages. - CloudKit container/environment and whether production schema is deployed. - Store size, relationship cardinality, uniqueness rules, and required invariants. - All released app versions that users can upgrade from. …
Read the whole file at its exact version.
How to install
mdr add fal3/claude-skills-collection/swiftdata-core-data-migrations@sha256:e4d0aeab1eb9865eThe line at the top of this page pins the label git:20260917.7201e74, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_uah2bqpslqw4kwtv)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Aug 14, 2026 and Sep 17, 2026, about one every 34 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260917.7201e74 latest | 2026-09-17 | 7201e74 | 9,230 B | A | view · diff |
| git:20260814.a9c26d7 | 2026-08-14 | a9c26d7 | 9,235 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9230 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
fal3/claude-skills-collection · 20 stars · license MIT · pushed 2026-10-28 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_uah2bqpslqw4kwtv GET https://markdownregistry.com/api/v1/resolve?ref=fal3/claude-skills-collection/swiftdata-core-data-migrations GET https://markdownregistry.com/api/v1/blob/e4d0aeab1eb9865e96ddf2c9ae85936b8cfcd7ca13ad392cd7c6fc838e2ff26a
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.