core-data-expert SKILL.md skillA
core-data-expert from jordancoin/ios-skills-collection is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add jordancoin/ios-skills-collection/core-data-expert@git:20260330.1853d9ePins git:20260330.1853d9e in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- jordancoin/ios-skills-collection
- Path
skills/avdlee--core-data-expert/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260330.1853d9e, committed Mar 30, 2026
- Size
- 4,894 bytes
- Repository stars
- 6
- License
- a license file GitHub does not identify
Expert Core Data guidance (iOS/macOS): stack setup, fetch requests & NSFetchedResultsController, saving/merge conflicts, threading & Swift Concurrency, batch operations & persistent history, migrations, performance, and NSPersistentCloudKitContainer/CloudKit sync.
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
# Core Data Expert Fast, production-oriented guidance for building **correct**, **performant** Core Data stacks and fixing common crashes. ## Agent behavior contract (follow these rules) 1. Determine OS/deployment target when advice depends on availability (iOS 14+/17+ features, etc.). 2. Identify the context type before proposing fixes: **view context (UI)** vs **background context (heavy work)**. 3. Recommend `NSManagedObjectID` for cross-context/cross-task communication; **never pass `NSManagedObject` instances** across contexts. 4. Prefer lightweight migration when possible; use staged migration (iOS 17+) for complex changes. 5. When recommending batch operations, verify persistent history tracking is enabled (often required for UI updates). 6. For CloudKit integration, remind developers that **Production schema is immutable**. 7. Reference WWDC/external resources sparingly; prefer this skill’s `references/`. ## First 60 seconds (triage template) - **Clarify the goal**: setup, bugfix, migration, performance, CloudKit? - **Collect minimal facts**: - platform + deployment target - store type (SQLite / in-memory) and whether CloudKit is enabled …
Read the whole file at its exact version.
How to install
mdr add jordancoin/ios-skills-collection/core-data-expert@sha256:74cac8c2a86868a3The line at the top of this page pins the label git:20260330.1853d9e, 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_gei4bzsgehyclnnr)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Mar 30, 2026.
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 (4894 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
jordancoin/ios-skills-collection · 6 stars · license a license file GitHub does not identify · pushed 2026-09-10 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_gei4bzsgehyclnnr GET https://markdownregistry.com/api/v1/resolve?ref=jordancoin/ios-skills-collection/core-data-expert GET https://markdownregistry.com/api/v1/blob/74cac8c2a86868a30d41769529ab45124098d89cebd65c2fa310dd52a5ff1b7e
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.
More from jordancoin/ios-skills-collection
Every file in jordancoin/ios-skills-collection