swift-concurrency SKILL.md skillA
swift-concurrency from patrickserrano/lacquer is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add patrickserrano/lacquer/swift-concurrency@git:20260725.3f0d943Pins git:20260725.3f0d943 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- patrickserrano/lacquer
- Path
profiles/ios/skills/swift-concurrency/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260725.3f0d943, committed Jul 25, 2026
- First version recorded
- Jun 17, 2026
- Size
- 10,974 bytes
- Repository stars
- 5
- License
- MIT
Diagnose data races, convert callback-based code to async/await, implement actor isolation patterns, resolve Sendable conformance issues, and guide Swift 6 migration. Use when developers mention: (1) Swift Concurrency, async/await, actors, or tasks, (2) "use Swift Concurrency" or "modern concurrency patterns", (3) migrating to Swift 6, (4) data races or thread safety issues, (5) refactoring closures to async/await, (6) @MainActor, Sendable, or actor isolation, (7) concurrent code architecture…
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 Concurrency
## Fast Path
Before proposing a fix:
1. Analyze `Package.swift` or `.pbxproj` to determine Swift language mode, strict concurrency level, default isolation, and upcoming features. Do this always, not only for migration work.
2. Capture the exact diagnostic and offending symbol.
3. Determine the isolation boundary: `@MainActor`, custom actor, actor instance isolation, or `nonisolated`.
4. Confirm whether the code is UI-bound or intended to run off the main actor. For delayed retries, timers, and backoff tasks, separate the waiting from the UI mutation. The sleep often belongs off the main actor even when the final state update belongs on it.
Project settings that change concurrency behavior:
| Setting | SwiftPM (`Package.swift`) | Xcode (`.pbxproj`) |
|---|---|---|
| Language mode | `swiftLanguageVersions` or `-swift-version` (`// swift-tools-version:` is not a reliable proxy) | Swift Language Version |
| Strict concurrency | `.enableExperimentalFeature("StrictConcurrency=targeted")` | `SWIFT_STRICT_CONCURRENCY` |
| Default isolation | `.defaultIsolation(MainActor.self)` | `SWIFT_DEFAULT_ACTOR_ISOLATION` |
…Read the whole file at its exact version.
How to install
mdr add patrickserrano/lacquer/swift-concurrency@sha256:f20c62bdbbf2e715The line at the top of this page pins the label git:20260725.3f0d943, 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_fwtng7xucuj2hqqy)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jun 17, 2026 and Jul 25, 2026, about one every 19 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260725.3f0d943 latest | 2026-07-25 | 3f0d943 | 10,974 B | A | view · diff |
| git:20260617.a228d79 | 2026-06-17 | a228d79 | 10,342 B | A | view · diff |
| git:20260617.2b85357 | 2026-06-17 | 2b85357 | 10,465 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 (10974 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
patrickserrano/lacquer · 5 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_fwtng7xucuj2hqqy GET https://markdownregistry.com/api/v1/resolve?ref=patrickserrano/lacquer/swift-concurrency GET https://markdownregistry.com/api/v1/blob/f20c62bdbbf2e715815b12f1c5c277562fda7239c9cf85d73aedc843a0ee4989
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.
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