Borrowing it
Nothing to install: this file belongs to kelvinkosbab/AppBootstrapAI. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/kelvinkosbab/AppBootstrapAI/main/.claude/skills/coredata-swift6-pro/SKILL.mdgit clone --depth 1 https://github.com/kelvinkosbab/AppBootstrapAIWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/kelvinkosbab/appbootstrapai/coredata-swift6-pro)<a href="https://agentmods.dev/skills/kelvinkosbab/appbootstrapai/coredata-swift6-pro"><img src="https://agentmods.dev/badge/skills/kelvinkosbab/appbootstrapai/coredata-swift6-pro/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/kelvinkosbab/appbootstrapai/coredata-swift6-pro"><img src="https://agentmods.dev/badge/skills/kelvinkosbab/appbootstrapai/coredata-swift6-pro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00044 | $0.01015 |
| Opus 5 | $0.00022 | $0.00508 |
| Sonnet 5 | $0.00009 | $0.00203 |
| Haiku 4.5 | $0.00004 | $0.00102 |
Grade A, and why
coredata-swift6-pro scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Review Core Data code for Swift 6 concurrency correctness, modern API usage, and SPM compatibility. Report only genuine problems - do not nitpick or invent issues.
Review process:
- Validate
viewContextaccess is@MainActor-isolated usingreferences/main-actor.md. - Check background context usage with
perform/performAndWaitusingreferences/background-contexts.md. - Verify SPM compatibility for
.xcdatamodeldbundling usingreferences/spm-limitations.md. - Check for modern persistent container patterns and fetch result types using
references/modern-patterns.md. - Flag direct cross-context object passing (must pass
NSManagedObjectIDinstead).
If doing a partial review, load only the relevant reference files.
Core Instructions
- Target Swift 6 with strict concurrency. Core Data + Swift 6 has specific rules that must be followed.
viewContextis bound to the main queue — all synchronous access must be@MainActoror wrapped inMainActor.run.NSManagedObjectsubclasses are NOTSendable. Never pass them across isolation boundaries — useNSManagedObjectIDinstead.- All background context work goes through
context.perform { }(async) orcontext.performAndWait { }(sync). - For SPM packages,
.xcdatamodeldcannot be compiled to.momdbyswift build— only Xcode can. Tests run viaswift testmust buildNSManagedObjectModelprogrammatically. - Use
NSPersistentContainer(orNSPersistentCloudKitContainer), not the deprecatedNSPersistentStoreCoordinatordirectly. - Prefer
.viewContext.automaticallyMergesChangesFromParent = trueso background changes propagate. - For tests, use
NSInMemoryStoreTypeso each test has an isolated store.
Output Format
Organize findings by file. For each issue:
- State the file and relevant line(s).
- Name the rule being violated.
- Show a brief before/after code fix.
Skip files with no issues. End with a prioritized summary of the most impactful changes to make first.
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 111 lines · 44 tokens per session scan A ab0426c900e8
coredata-swift6-pro is a skill published in the GitHub repository kelvinkosbab/AppBootstrapAI (6 stars, last pushed yesterday), licensed MIT. It adds 44 tokens to every session and 1,015 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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