1# Reference Index
2 
3Quick navigation for the Swift Concurrency skill.
4 
5## Foundations
6 
7| File | Use it for |
8|---|---|
9| `async-await-basics.md` | closure-to-async bridges and foundational async/await usage |
10| `tasks.md` | `Task`, cancellation, task groups, structured vs unstructured work |
11| `actors.md` | actor isolation, `@MainActor`, reentrancy, isolated conformances |
12| `sendable.md` | `Sendable`, `@Sendable`, region isolation, escape hatches |
13| `threading.md` | execution model, suspension points, Swift 6.2 isolation behavior |
14 
15## Streams
16 
17| File | Use it for |
18|---|---|
19| `async-sequences.md` | deciding between `AsyncSequence`, `AsyncStream`, and one-shot async APIs |
20| `async-algorithms.md` | debounce, throttle, merge, `combineLatest`, channels, timers |
21 
22## Applied Topics
23 
24| File | Use it for |
25|---|---|
26| `testing.md` | Swift Testing first, XCTest fallback, leak checks |
27| `performance.md` | Instruments workflow, actor hops, suspension cost |
28| `memory-management.md` | retain cycles, long-lived tasks, cleanup |
29| `core-data.md` | `NSManagedObjectID`, `perform`, default isolation conflicts |
30 
31## Migration and Tooling
32 
33| File | Use it for |
34|---|---|
35| `migration.md` | rollout order, build settings, migration guardrails |
36| `linting.md` | concurrency-focused lint rules |
37| `glossary.md` | quick definitions |
38 
39## Problem Router
40 
41- "I need to fix a compiler error quickly" → `../SKILL.md`
42- "I need to replace a callback with async/await" → `async-await-basics.md`
43- "I need to protect shared mutable state" → `actors.md`
44- "I need to pass data safely across boundaries" → `sendable.md`
45- "I need stream operators" → `async-algorithms.md`
46- "I need to understand why code runs where it runs" → `threading.md`
47- "I need to stop a leak or lifetime issue" → `memory-management.md`
48- "I need to migrate to Swift 6" → `migration.md`
49- "I need to test async code" → `testing.md`
50- "I need to optimize slow async code" → `performance.md`
51