Next.js best practices - file conventions, RSC boundaries, data patterns, async APIs, metadata, error handling, route handlers, image/font optimization, bundling
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Next.js best practices - file conventions, RSC boundaries, data patterns, async APIs, metadata, error handling, route handlers, image/font optimization, bundling
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Systematically find and fix performance problems in applications, frontend and backend, by measuring first. Use this skill whenever the user reports slow endpoints, high latency, poor throughput, memory leaks, large bundles, or slow page loads; wants to profile with cProfile, py-spy, Chrome DevTools, Node --cpu-prof, or perf; run load tests with locust or k6; set performance budgets or SLOs; optimize database queries (EXPLAIN, indexes, N+1); add caching (Redis); improve frontend performance (code splitting, lazy loading, image optimization, memoization, virtualization); or tune the network (CDNs, gzip/br, HTTP/2/3). Also trigger for p50/p95/p99 latency, throughput, error rate, connection pooling, async vs threads, GIL, and memory leak investigations.
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Use when writing or refactoring modern C# with maintainability and performance standards. Keywords: coding standards, C# best practices, refactor C#, records, pattern matching, async best practices.
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Re-audit code changes to identify side effects, regression risks, and unhandled edge cases before merging or deploying. Use after a change is complete and before merging to a shared branch, before deploying a hotfix, after complex multi-module refactoring, or when a previous review may have missed side effects in async, state-mutating, or security-sensitive code paths.
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Escreva código C# moderno com recursos avançados como records, pattern matching e async/await. Otimiza aplicações .NET, implementa padrões empresariais e garante testes abrangentes.
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Design, review, and diagnose tests and fixtures that can fail nondeterministically under CI concurrency, shared host resources, clocks, process-global state, subprocesses, network listeners, or asynchronous teardown. Use when adding or changing tests with those risks, investigating flaky CI, or reviewing test isolation; use pre-push-checks separately to select outgoing commands.
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The `ollama` Python package used properly - chat and generate with streaming, embeddings, tool calling, structured outputs with a JSON Schema, the async client, keep_alive, timeouts and cancellation - and a project shape whose benchmark arithmetic is unit-tested against a fake transport while the live half skips loudly when no daemon answers.
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Reviews and fixes Swift concurrency: Swift 6 strict-concurrency compiler errors, Sendable conformance, actor isolation, @MainActor, and data-race safety. Use when migrating async code to Swift 6 or resolving concurrency diagnostics.
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Also use for async Python patterns, Pydantic schemas for LLM structured outputs, retry strategies for LLM calls, background AI jobs, or any service combining FastAPI and LLMs. If Python + AI backend is in scope — use this skill
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Appwrite Swift SDK skill. Use when building native iOS, macOS, watchOS, or tvOS apps, or server-side Swift applications with Appwrite. Covers client-side auth (email, OAuth), database queries, file uploads, real-time subscriptions with async/await, and server-side admin via API keys for user management, database administration, storage, and functions.
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Appwrite Rust SDK skill. Use when building server-side Rust applications with Appwrite. Covers async client setup with API keys, user management, TablesDB database/table/row operations, file storage, function executions, permissions, queries, and error handling. Uses the crates.io `appwrite` package and Tokio.
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Idiomatic programming style, patterns, and conventions for Python development. Trigger when: - Writing, refactoring, reviewing, or debugging Python code. - Files matching the pattern **/*.py (including requirements.txt, pyproject.toml, setup.py) are in the workspace or referenced. - Tasks involve: python, pytest, pip, uv, virtualenv, flake8, black, mypy. - Prompt contains keywords: python, py, pep8, typing, list comprehension, decorator, generator, asyncio, yield, poetry.
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Idiomatic programming style, patterns, and conventions for TypeScript and JavaScript development. Trigger when: - Writing, refactoring, reviewing, or debugging TypeScript or JavaScript code. - Files matching the patterns **/*.ts, **/*.tsx, **/*.js, **/*.jsx, package.json are in the workspace or referenced. - Tasks involve: tsc, npm, yarn, pnpm, bun, eslint, prettier, vite, next.js. - Prompt contains keywords: typescript, ts, js, javascript, interface, type, async, await, promise, es6, node, deno.
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Reusable skill for coding agents (Claude, GPT, etc.) to build, optimize, debug, and productionize AI agents and coding agents in Rust. Embeds Rig/ADK patterns, Tokio async architecture, tracing observability, performance techniques, erro...
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Azure Cosmos DB SDK for Java. NoSQL database operations with global distribution, multi-model support, and reactive patterns. Triggers: "CosmosClient java", "CosmosAsyncClient", "cosmos database java", "cosmosdb java", "document database java".
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Modern Angular UI patterns for loading states, error handling, and data display. Use when building UI components, handling async data, or managing component states.
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Educational single-threaded TypeScript vanity address generator for Solana using @solana/web3.js with async iteration, event-loop yielding, streaming generator API, and best-effort memory zeroization.
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Use for AI SDK for Python async-generator tools, streaming tool output, subagent tools, PartialToolCallResult events, and custom tool aggregation.
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Turn a brief, script, shot list, or approved reference into asynchronous text-to-video, image-to-video, or reference-driven clips.
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Generate Atlas Cloud images and videos through its asynchronous media API with schema-first model selection and credential-safe polling.
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Modern Angular UI patterns for loading states, error handling, and data display. Use when building UI components, handling async data, or managing component states.
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Trigger.dev expert for background jobs, AI workflows, and reliable async execution with excellent developer experience and TypeScript-first design.
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Scans .NET code for ~50 performance anti-patterns across async, memory, strings, collections, LINQ, regex, serialization, and I/O with tiered severity classification. Use when analyzing .NET code for optimization opportunities, reviewing hot paths, or auditing allocation-heavy patterns.
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Functional error handling in Dart using the fpdart package with Either, Option, TaskEither, and Do notation. Use when replacing try-catch with type-safe error handling or composing async operations functionally.
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