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Python type checking expertise using ty - the extremely fast type checker by Astral. Use when: (1) Adding type annotations to Python code, (2) Fixing type errors reported by ty, (3) Migrating from mypy/pyright to ty, (4) Configuring ty for projects, (5) Understanding advanced type patterns (generics, protocols, intersection types), (6) Setting up ty in editors (VS Code, Cursor, Neovim, PyCharm).

Build async FastAPI applications with async/await endpoints, background tasks, middleware, lifespan events, WebSockets, and streaming responses. Use when the user builds a FastAPI app, asks about async patterns, implements real-time features, or needs non-blocking I/O. Trigger when you see synchronous code in FastAPI that should be async.

Patterns for Claude tool use including tool definition schemas, multi-tool orchestration, parallel tool calls, error handling, and result formatting. Use when the user is defining tools for Claude, building agentic workflows with tool calling, handling tool errors, or implementing multi-step tool pipelines.

Python code style enforcement

Patterns for multi-agent systems including orchestrator, pipeline, consensus, delegation, supervisor, and swarm patterns. Use when the user is building multi-agent workflows, coordinating multiple AI agents, implementing agent delegation or supervision, or designing systems where agents collaborate on complex tasks.

Apply safe, idiomatic Go concurrency patterns with goroutines and channels. Use when the user works with goroutines, channels, sync primitives, context cancellation, worker pools, fan-in/fan-out, select statements, or asks about concurrent Go programming and avoiding race conditions.

Guide pull request creation, review process, CI gates, and merge strategies. Use when the user creates a PR, asks about PR templates, review workflows, CODEOWNERS setup, or merge strategies. Apply when running gh pr create.

Configura permissões do Claude Code via linguagem natural para ferramentas CLI (git, gcloud, aws, kubectl, maven, gradle, npm, docker), tipos de projeto (Rust, Java, TypeScript, Python) e padrões de arquivo, detectando automaticamente tipos de projeto e pesquisando os desconhecidos. Use quando solicitado a configurar permissões, habilitar git, permitir docker, configurar permissões de projeto, aplicar perfil de permissão ou tornar arquivos editáveis.

Test organization, fixtures, factories (factory_boy/faker), test isolation, database cleanup, and test configuration. Use when the user is setting up a test suite, organizing test files, creating test fixtures, or dealing with test isolation issues.

创建高质量 MCP（模型上下文协议）服务器的指南，使 LLM 能够通过精心设计的工具与外部服务交互。在构建 MCP 服务器以集成外部 API 或服务时使用，无论是 Python（FastMCP）还是 Node/TypeScript（MCP SDK）。

Guide for writing Docker Compose files with services, networks, volumes, health checks, and environment management. Use when the user creates or modifies docker-compose.yml, asks about multi-container setups, local development environments, or service orchestration. Trigger whenever Docker Compose, multi-container, or local dev environment is mentioned.

Patterns for running independent tasks in parallel using multiple tool calls and Agent invocations. Use when the user has multiple independent operations, asks about fan-out/fan-in, or wants to speed up multi-step workflows.