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Strategies for managing AI agent context windows including optimization, summarization, retrieval-augmented generation, progressive disclosure, and pruning. Use when the user is hitting context limits, building long-running agents, implementing RAG, optimizing token usage, or designing systems that need to manage large amounts of information within limited context windows.

Python backend development expertise for FastAPI, security patterns, database operations, Upstash integrations, and code quality. Use when: (1) Building REST APIs with FastAPI, (2) Implementing JWT/OAuth2 authentication, (3) Setting up SQLAlchemy/async databases, (4) Integrating Redis/Upstash caching, (5) Refactoring AI-generated Python code (deslopification), (6) Designing API patterns, or (7) Op

Mocks vs stubs vs spies, dependency injection for testing, jest.mock/unittest.mock/gomock, and when NOT to mock. Use when the user needs to isolate dependencies in tests, asks about mocking external services, or has tests tightly coupled to implementation details.

Customize Django admin: ModelAdmin, inline models, custom actions, list_display, list_filter, search, admin site customization, and custom views. Use when the user configures Django admin, asks about admin customization, registers models, or needs admin-side data management features. Trigger when you see bare admin.site.register() calls without ModelAdmin classes.

Use when you want a thorough code review of files, changes, or the entire project before shipping.

Referência para a interface de linha de comando (`fused`) do Fused Python SDK. Utilize para gerenciar UDFs, canvases, arquivos ou segredos via Fused CLI, ou ao criar comandos shell que invocam `fused`.

Create professional Excalidraw diagrams by generating JSON directly. This skill provides the Excalidraw JSON schema reference and professional icon libraries for AI agents to autonomously create diagrams without templates.

Systematic code review checklist with severity classification. Activate whenever the user asks for a code review, wants feedback on their code, submits a PR for review, or asks what to look for when reviewing code. Also activate when writing review comments or discussing code quality standards.

Implement lazy loading and code splitting to reduce initial bundle size and improve load times. Activate whenever the user works on bundle optimization, asks about code splitting, implements dynamic imports, uses React.lazy or Suspense, sets up route-based splitting, or optimizes image loading with intersection observer.

Patterns for inter-agent communication including message passing, shared state, event-driven architectures, pub/sub, inbox/outbox, and structured vs freeform messages. Use when the user is building systems where multiple agents need to communicate, share information, coordinate work, or pass data between processing stages.

Patterns for structuring MEMORY.md and topic-based memory files for Claude Code persistent memory. Use when the user asks about remembering things across sessions, wants to organize project knowledge, or needs guidance on what to save vs not save.

Implement idiomatic Rust error handling with Result, Option, and the ? operator. Use when the user handles errors in Rust, creates custom error types, uses thiserror or anyhow, implements the From trait for error conversion, or asks about Result/Option patterns and error composition strategies.