{"slug":"prisma-labs-dev-guide-swift-concurrency","name":"guide-swift-concurrency","description":"Swift concurrency patterns — actors, structured concurrency, cancellation, async streams, GCD migration, strict-concurrency diagnostics, common bug patterns. Use when writing, reviewing, or debugging concurrent Swift code.","long_description":"---\nname: guide-swift-concurrency\ndescription: Swift concurrency patterns — actors, structured concurrency, cancellation, async streams, GCD migration, strict-concurrency diagnostics, common bug patterns. Use when writing, reviewing, or debugging concurrent Swift code.\ntype: guide\norigin: https://github.com/twostraws/Swift-Concurrency-Agent-Skill\nlicense: MIT\n---\n\n> **Guide Skill** — This is an expert workflow/pattern guide, not API reference documentation.\n> Originally from [twostraws/Swift-Concurrency-Agent-Skill](https://github.com/twostraws/Swift-Concurrency-Agent-Skill) by Paul Hudson. MIT License.\n\n# Swift Concurrency Patterns\n\nReview and write Swift concurrency code for correctness, modern API usage, and adherence to project conventions. Report only genuine problems — do not nitpick or invent issues.\n\n## Core Instructions\n\n- Target Swift 6.2 or later with strict concurrency checking.\n- Prefer structured concurrency (task groups) over unstructured (`Task {}`).\n- Prefer Swift concurrency over GCD for new code. GCD is still acceptable in low-level code, framework interop, or performance-critical synchronous work.\n- Do not suggest `@unchecked Sendable` to fix compiler errors — prefer actors, value types, or `sending` parameters.\n\n## Review Process\n\n1. Scan for known-dangerous patterns using `references/hotspots.md`.\n2. Check for Swift 6.2 concurrency behavior using `references/new-features.md`.\n3. Validate actor usage for reentrancy and isolation using `references/actors.md`.\n4. Ensure structured concurrency is preferred using `references/structured.md`.\n5. Check unstructured task usage using `references/unstructured.md`.\n6. Verify cancellation handling using `references/cancellation.md`.\n7. Validate async stream and continuation usage using `references/async-streams.md`.\n8. Check bridging code between sync and async using `references/bridging.md`.\n9. Review legacy concurrency migrations using `references/interop.md`.\n10. Cross-check against common failure modes using `references/bug-patterns.md`.\n11. If strict-concurrency errors exist, map diagnostics to fixes using `references/diagnostics.md`.\n12. If reviewing tests, check async test patterns using `references/testing.md`.\n\nIf doing partial work, load only the relevant reference files.\n\n## References\n\n| Topic | Reference |\n|-------|-----------|\n| Grep targets for code review — known-dangerous patterns | `references/hotspots.md` |\n| Swift 6.2: default isolation, `@concurrent`, `Task.immediate`, isolated deinit | `references/new-features.md` |\n| Actor reentrancy, global actor inference, isolation patterns | `references/actors.md` |\n| Task groups, `async let`, `withDiscardingTaskGroup`, concurrency limits | `references/structured.md` |\n| `Task` vs `Task.detached`, when `Task {}` is a code smell | `references/unstructured.md` |\n| Cooperative cancellation, `withTaskCancellationHandler`, broken patterns | `references/cancellation.md` |\n| `AsyncStream.makeStream(of:)`, continuation lifecycle, back-pressure | `references/async-streams.md` |\n| Checked continuations, wrapping delegates, `@unchecked Sendable` | `references/bridging.md` |\n| GCD migration, Combine to AsyncSequence, completion handlers, locks | `references/interop.md` |\n| Common concurrency failure modes LLMs produce and their fixes | `references/bug-patterns.md` |\n| Strict-concurrency compiler errors mapped to likely fixes | `references/diagnostics.md` |\n| Async test patterns, race detection, avoiding timing-based tests | `references/testing.md` |\n","tagline":"Swift concurrency patterns — actors, structured concurrency, cancellation, async streams, GCD migration, strict-concurrency diagnostics, common bug patterns. 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issue activity unavailable in current metadata"]},"coverageTags":["Coding","Coding agents","design-creative","agent-skill"]},"audit":{"audit_score":82,"risk_level":"safe_to_try","risk_label":"Safe to try","quality_score":72,"trust_score":79,"maintenance_score":100,"security_score":84,"install_score":92,"warnings":["Quality score needs review","Stars/forks activity: 324 stars, 18 forks; issue activity unavailable in current metadata"]},"quality_signals":{"model":"v2","star_score":17.58,"usage_score":0,"review_score":5.7,"metadata_score":3,"freshness_score":15},"platforms":["Claude Code"],"use_cases":[{"slug":"coding-agents","title":"Coding agents","url":"https://www.openagentskill.com/use-cases/coding-agents"},{"slug":"github-automation","title":"GitHub automation","url":"https://www.openagentskill.com/use-cases/github-automation"},{"slug":"browser-automation","title":"Browser automation","url":"https://www.openagentskill.com/use-cases/browser-automation"},{"slug":"workflow-automation","title":"Workflow automation","url":"https://www.openagentskill.com/use-cases/workflow-automation"}],"stacks":[{"slug":"coding-review-agent","title":"Coding review agent","url":"https://www.openagentskill.com/collections/coding-review-agent"},{"slug":"browser-qa-agent","title":"Browser QA agent","url":"https://www.openagentskill.com/collections/browser-qa-agent"},{"slug":"frontend-product-ui","title":"Frontend and UI","url":"https://www.openagentskill.com/collections/frontend-product-ui"}],"install":"npx skills add Prisma-Labs-Dev/apple-skills --skill guide-swift-concurrency","install_targets":[{"id":"openagentskill-cli","label":"CLI","title":"OpenAgentSkill CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.3.0/openagentskill-0.3.0.tgz add prisma-labs-dev-guide-swift-concurrency","description":"Resolve policy, run the source installer safely, and report a verified install receipt.","copyLabel":"Copy command"},{"id":"codex","label":"Codex","title":"Codex install prompt","kind":"agent-prompt","value":"Install the \"guide-swift-concurrency\" agent skill from https://github.com/Prisma-Labs-Dev/apple-skills/tree/main/skills/guide-swift-concurrency. Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: Swift concurrency patterns — actors, structured concurrency, cancellation, async streams, GCD migration, strict-concurrency diagnostics, common bug patterns. Use when writing, reviewing, or debugging concurrent Swift code. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"prisma-labs-dev-guide-swift-concurrency\",\"task\":\"Install guide-swift-concurrency\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Give Codex a repo-aware install prompt when the skill is not available through a local CLI.","copyLabel":"Copy prompt"},{"id":"claude-code","label":"Claude Code","title":"Claude Code skill prompt","kind":"agent-prompt","value":"Add \"guide-swift-concurrency\" as a Claude Code skill from https://github.com/Prisma-Labs-Dev/apple-skills/tree/main/skills/guide-swift-concurrency. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: Swift concurrency patterns — actors, structured concurrency, cancellation, async streams, GCD migration, strict-concurrency diagnostics, common bug patterns. Use when writing, reviewing, or debugging concurrent Swift code. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"prisma-labs-dev-guide-swift-concurrency\",\"task\":\"Install guide-swift-concurrency\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this prompt to ask Claude Code to add the skill and explain the local activation steps.","copyLabel":"Copy prompt"},{"id":"cursor","label":"Cursor","title":"Cursor rule prompt","kind":"agent-prompt","value":"Turn \"guide-swift-concurrency\" from https://github.com/Prisma-Labs-Dev/apple-skills/tree/main/skills/guide-swift-concurrency into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: Swift concurrency patterns — actors, structured concurrency, cancellation, async streams, GCD migration, strict-concurrency diagnostics, common bug patterns. Use when writing, reviewing, or debugging concurrent Swift code. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"prisma-labs-dev-guide-swift-concurrency\",\"task\":\"Install guide-swift-concurrency\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this when installing as Cursor project rules or reusable agent instructions.","copyLabel":"Copy prompt"}],"repository":"https://github.com/Prisma-Labs-Dev/apple-skills/tree/main/skills/guide-swift-concurrency","github_repo":"Prisma-Labs-Dev/apple-skills","version":"1.0.0","license":"MIT","urls":{"web":"https://www.openagentskill.com/skills/prisma-labs-dev-guide-swift-concurrency","repository":"https://github.com/Prisma-Labs-Dev/apple-skills/tree/main/skills/guide-swift-concurrency","api":"/api/agent/skills/prisma-labs-dev-guide-swift-concurrency","install_api":"/api/skills/prisma-labs-dev-guide-swift-concurrency/install"},"meta":{"created_at":"2026-09-05T23:40:59.846441+00:00","updated_at":"2026-09-05T23:40:59.968284+00:00","agent_friendly":true}}