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You MUST use this before any creative work - creating features, building components, adding functionality, modifying behavior, designing systems, or making architectural decisions. Enters plan mode, reads all available docs, explores the codebase deeply, then interviews the user relentlessly with ultrathink-level reasoning on every decision until a shared understanding is reached. Produces a validated design spec before any implementation begins. Triggers on feature requests, design discussions, refactors, new projects, component creation, system changes, and any task requiring design decisions.

Code quality patterns and guidelines for ToolUniverse tool development. Apply when writing, fixing, or refactoring tool Python code in the ToolUniverse project. Encodes lessons from 80+ debug rounds. Use alongside devtu-fix-tool and devtu-self-evolve. Triggers: implementing tool fixes, writing new tool classes, reviewing tool code quality, checking schema correctness, looking up API-specific bug fixes.

Authoring MSW scripts (.mlua) plus integrated playtest and debugging. Covers mlua syntax, annotations (@Component/@Logic/@ExecSpace/@Sync), lifecycle, exec…

Technical analysis with 130+ indicators using pandas-ta for crypto market data

Provide systematic methodologies for leveraging Shodan as a reconnaissance tool during penetration testing engagements.

TanStack Query (React Query) best practices for data fetching, caching, mutations, and server state management. Activate when building data-driven React…

Expert in creating clear, comprehensive technical documentation with Nextra (Next.js-based docs framework), MDX, and modern documentation patterns. Use for…

Automate QA regression testing with reusable test skills. Create login flows, dashboard checks, user creation, and other common test scenarios that run…

Diagnose and fix React codebase health issues. Use when reviewing React code, fixing performance problems, auditing security, or improving code quality.

React Native Reanimated 4.x animation patterns. Use when adding animations, transitions, entering/exiting effects, or gesture-driven animations to React Native…

Implements comprehensive observability with OpenTelemetry tracing, Prometheus metrics, and structured logging. Includes instrumentation plans, sample…

Implements accessible modals and drawers with focus trap, ESC to close, scroll lock, portal rendering, and ARIA attributes. Includes sample implementations for…

Route performance work from the artifact people already have into one measurement-led tuning brief. Use when the main job is locating the tightest latency, throughput, memory, bundle-size, or frame-budget bottleneck; choosing the right trace, query plan, load-test result, profiler capture, or CWV report; naming one bottleneck; and recommending one or two bounded optimizations with before/after verification. Route telemetry rollout to monitoring-observability, correctness diagnosis to debugging, structural cleanup to code-refactoring, validation-policy design to testing-strategies, and engine-specific capture interpretation to game-performance-profiler.

Build, validate, and publish Obsidian plugins following official community submission standards. Use when developing an Obsidian plugin from scratch, reviewing existing plugin code, fixing ESLint violations from eslint-plugin-obsidianmd, preparing a plugin for community directory submission, or applying Obsidian-specific best practices (memory management, type safety, accessibility, CSS variables, vault API). Triggers on: obsidian plugin, obsidian development, obsidian-plugin, create obsidian plugin, obsidian eslint, obsidian submission, obsidian community plugin, obsidian API, plugin boilerplate, obsidian typescript, obsidian vault, obsidian settings, obsidian commands.

Build React animations with Motion (formerly Framer Motion) - gestures (drag, hover, tap), scroll effects, spring physics, layout animations, SVG, exit animations, and motion values. Use when: building React animations, adding hover/tap/drag interactions, scroll-triggered effects, layout transitions, shared element animations, exit animations with AnimatePresence, or working with motion values and springs. Triggers: "animate", "motion component", "framer motion", "gesture", "drag", "scroll animation", "layout animation", "exit animation", "spring", "whileHover", "whileTap", "whileInView", "AnimatePresence", "layoutId", "useScroll", "useSpring", "useAnimate", "motion value", "reorder", "parallax".

Comprehensive guide for implementing Syncfusion Blazor dropdown components including AutoComplete, ComboBox, DropDown List, MultiSelect Dropdown, and ListBox.…

Routing-first responsive layout strategy and verification for web interfaces. Use when the main job is classifying whether the failure is page-shell adaptation, reusable component/container behavior, dense-data or toolbar pressure, responsive media, or reflow verification — then turning vague “breaks on mobile” requests into one concrete strategy packet. Route component API design to `ui-component-patterns`, accessibility remediation to `web-accessibility`, system-wide breakpoint/token governance to `design-system`, and broad UI audit work to `web-design-guidelines`.

Hooks for managing, caching and syncing asynchronous and remote data in Vue. ALWAYS use when writing code importing \"@tanstack/vue-query\". Consult for…

Backend development specialist covering API design, database integration, microservices architecture, and modern backend patterns. Use when designing APIs, implementing server logic, authentication, or authorization.

Expert-level livestock management, animal health monitoring, breeding programs, and ranch management