worktrees

Swift language features beyond concurrency: attributes (@available, @backDeployed, @discardableResult, @inlinable, @frozen, @resultBuilder, @propertyWrapper) and macro usage (#Preview, custom macros). Use when working with availability, library evolution, result builders, property wrappers, or Swift macros.

Diagnose data races, implement actor isolation, resolve Sendable issues, fix @Observable + @MainActor interaction problems, and guide Swift 6 migration. Use when developers work with Swift Concurrency, async/await, actors, tasks, @MainActor, Sendable, or @Observable in concurrent contexts.

Go development with toolchain-first verification workflow - writing, testing, debugging, profiling, and dependency management.

Azure DevOps operations -- PRs, pipelines, policies, builds, variable groups, environments, feeds, branches, work items, comments. This skill should be used when the user asks to "create a PR", "list pipelines", "run a pipeline", "check build status", "debug failed pipeline", "create a policy", "add reviewers", "create a work item", "update a task", "list environments", "approve a pipeline", "manage variable groups", "delete a branch", "comment on a PR", "review PR comments", "comment on work items", "resolve PR thread", "code suggestion", or mentions Azure DevOps, ADO, or az devops CLI. Uses az CLI with PAT auth.