swift-actor-persistence SKILL.md skillA
swift-actor-persistence from affaan-m/ecc is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add affaan-m/ecc/swift-actor-persistence@git:20260607.4ad5756Pins git:20260607.4ad5756 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- affaan-m/ecc
- Path
.kiro/skills/swift-actor-persistence/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260607.4ad5756, committed Jun 7, 2026
- Size
- 4,840 bytes
- Repository stars
- 299,696
- License
- MIT
Thread-safe data persistence in Swift using actors — in-memory cache with file-backed storage, eliminating data races by design.
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
# Swift Actors for Thread-Safe Persistence
Patterns for building thread-safe data persistence layers using Swift actors. Combines in-memory caching with file-backed storage, leveraging the actor model to eliminate data races at compile time.
## When to Activate
- Building a data persistence layer in Swift 5.9+ (iOS 17+, macOS 14+)
- Need thread-safe access to shared mutable state
- Want to eliminate manual synchronization (locks, DispatchQueues)
- Building offline-first apps with local storage
## Core Pattern
### Actor-Based Repository
The actor model guarantees serialized access — no data races, enforced by the compiler.
```swift
public actor LocalRepository<T: Codable & Identifiable> where T.ID == String {
private var cache: [String: T] = [:]
private let fileURL: URL
public init(directory: URL = .documentsDirectory, filename: String = "data.json") {
self.fileURL = directory.appendingPathComponent(filename)
// Synchronous load during init (actor isolation not yet active)
self.cache = Self.loadSynchronously(from: fileURL)
}
// MARK: - Public API
public func save(_ item: T) throws {
cache[item.id] = item
…Read the whole file at its exact version.
How to install
mdr add affaan-m/ecc/swift-actor-persistence@sha256:f83d03866a684de4The line at the top of this page pins the label git:20260607.4ad5756, 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_tclpflyp34qvtx5m)
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Versions
The registry has recorded 1 version of this file, committed on Jun 7, 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 (4840 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
affaan-m/ecc · 299,696 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_tclpflyp34qvtx5m GET https://markdownregistry.com/api/v1/resolve?ref=affaan-m/ecc/swift-actor-persistence GET https://markdownregistry.com/api/v1/blob/f83d03866a684de4ad4cb82f6b3d3ed42bc8d3e1568c65a39974b6e80dd3f0ed
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.