swift-concurrency-expert
Review and fix Swift concurrency issues such as actor isolation and Sendable violations.
Best for Swift 6.2+ codebasesWorks with GitHubLow risk
⌘source
- author
@sickn33- language
- Python
★34kstars
5.6kforks
Apr 18, 2026
✦overview.md
Key Features
- ·Reviews and fixes Swift concurrency compiler diagnostics
- ·Applies actor isolation and Sendable safety
- ·Focuses on minimal behavior changes
- ·Handles UI-bound types with @MainActor
- ·Supports Swift 6.2+ codebases
- ·Works with modern concurrency patterns
Use Cases
- →Reviewing Swift concurrency usage when asked by a developer
- →Fixing compiler diagnostics related to actor isolation or Sendable violations
- →Getting guidance on @MainActor usage or async migration
Best for
- ✓Swift 6.2+ codebases
- ✓Teams adopting modern Swift concurrency
- ✓Projects with strict concurrency checking enabled
Not ideal for
- !Swift versions below 6.2
- !Non-concurrency related code issues
FAQs
name
swift-concurrency-expert
description
Review and fix Swift concurrency issues such as actor isolation and Sendable violations.
risk:safe
source:Dimillian/Skills (MIT)
date_added:2026-03-25
Swift Concurrency Expert
Overview
Review and fix Swift Concurrency issues in Swift 6.2+ codebases by applying actor isolation, Sendable safety, and modern concurrency patterns with minimal behavior changes.
When to Use
- When the user asks to review Swift concurrency usage or fix compiler diagnostics.
- When you need guidance on actor isolation,
Sendable,@MainActor, or async migration.
Workflow
1. Triage the issue
- Capture the exact compiler diagnostics and the offending symbol(s).
- Check project concurrency settings: Swift language version (6.2+), strict concurrency level, and whether approachable concurrency (default actor isolation / main-actor-by-default) is enabled.
- Identify the current actor context (
@MainActor,actor,nonisolated) and whether a default actor isolation mode is enabled. - Confirm whether the code is UI-bound or intended to run off the main actor.
2. Apply the smallest safe fix
Prefer edits that preserve existing behavior while satisfying data-race safety.
Common fixes:
- UI-bound types: annotate the type or relevant members with
@MainActor.
$install
1-click copynpx skills add sickn33/antigravity-awesome-skills --skill swift-concurrency-expertSafety assessment
★
Clarity score
How clear and easy to understand the SKILL.md instructions are, rated from 1 to 5.
5/ 5
excellentVery clear and well structured, with almost no room for misunderstanding.
◎
Actionability score
How directly an agent can act on the SKILL.md instructions, rated from 1 to 5.
5/ 5
very highHighly actionable with clear, concrete steps that an agent can follow directly.