concurrency-patterns

SKILL.md

Expert decision frameworks for Swift concurrency choices. Claude knows async/await syntax — this skill provides judgment calls for pattern selection and isolation boundaries.

async let gotcha: All async let values MUST be awaited before scope ends. Forgetting to await silently cancels the task — no error, just missing data.

The trap: Task { } inside @MainActor runs on MainActor. For truly background work, use Task.detached(priority:).

Expert Swift concurrency decisions: async let vs TaskGroup selection, actor isolation boundaries, @MainActor placement strategies, Sendable conformance judgment calls, and structured vs unstructured task trade-offs. Use when designing concurrent code, debugging data races, or choosing between concurrency patterns. Trigger keywords: async, await, actor, Task, TaskGroup, @MainActor, Sendable, concurrency, data race, isolation, structured concurrency, continuation Source: kaakati/rails-enterprise-dev.

View raw