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Found 217 Skills
Deterministic audit of cron/scheduled job scripts for reliability, error handling, logging, cleanup, and concurrency safety. Use when user says "audit cron", "check cron script", "cron best practices", "scheduled job review", or "bash script audit". Do NOT use for crontab scheduling syntax, systemd timers, or general shell linting without a cron/scheduled-job context.
Build, review, or improve Core Data persistence in apps that have not adopted SwiftData. Use when working with NSManagedObject subclasses, NSFetchedResultsController for list-driven UI, NSBatchInsertRequest / NSBatchDeleteRequest / NSBatchUpdateRequest for bulk operations, NSPersistentHistoryChangeRequest for persistent history tracking and multi-target sync, NSStagedMigrationManager for staged schema migrations (iOS 17+), NSCompositeAttributeDescription for composite attributes (iOS 17+), or when integrating Core Data threading with Swift Concurrency. For Core Data + SwiftData coexistence or migration, see the swiftdata skill instead.
Concurrency safety patterns for distributed pueue + mise + systemd-run job pipelines. TRIGGERS - queue pueue jobs, deploy to remote host, concurrent job collisions, checkpoint races, resource guards, cgroup memory limits, systemd-run, autoscale, batch processing safety, job parameter isolation.
Idiomatic Go patterns for errors, interfaces, concurrency, and packages. Use when: - Writing or reviewing Go code - Designing interfaces or package structure - Implementing concurrency patterns - Handling errors and context propagation - Structuring Go projects Keywords: Go, golang, error wrapping, interface design, goroutine, channel, context, package design, dependency injection, race condition
Use when configuring or working with Solid Queue for background jobs. Applies Rails 8 conventions, database-backed job processing, concurrency settings, recurring jobs, and production deployment patterns.
Kotlin Coroutines and Flow patterns for structured concurrency, error handling, and async operations.
Kotlin coroutines - structured concurrency, Flows, exception handling
FastAPI production-grade best practices and guidelines for building scalable, high-performance web APIs. Covers project structure, async concurrency, Pydantic validation, dependency injection, and database patterns.
Effect-TS (Effect) guidance for TypeScript. Use when building, refactoring, reviewing, or explaining Effect code, especially for: typed error modeling (expected errors vs defects), Context/Layer/Effect.Service dependency wiring, Scope/resource lifecycles, runtime execution boundaries, schema-based decoding, concurrency/scheduling/streams, @effect/platform APIs, Effect AI workflows, and Promise/async migration.
Go programming language skill for writing idiomatic Go code, code review, error handling, testing, concurrency, security, and program design. Use when writing Go code, reviewing Go PRs, debugging Go tests, fixing Go errors, designing Go APIs, implementing security-sensitive code, handling user input, authentication, sessions, cryptography, or asking about Go best practices. Covers table-driven tests, error wrapping, goroutine patterns, interface design, generics, iterators, stdlib patterns up to Go 1.26, and OWASP security practices.
Consult this skill for async Python patterns and concurrency. Use when building async APIs, concurrent systems, I/O-bound applications, implementing rate limiting, async context managers. Do not use when CPU-bound optimization - use python-performance instead. DO NOT use when: testing async code - use python-testing async module.
Thread-safe data persistence in Swift using actors — in-memory cache with file-backed storage. Use when building local storage layers, offline-first patterns, or any shared mutable state that needs both concurrency safety and disk persistence.