Use when designing new screens, redesigning existing UI, creating visual concepts, or improving interfaces in Nicolify. Executes a 7-phase creative Design Thinking workflow: defines user personas, frames problems, audits existing components (Shadcn UI + Tailwind CSS v4 + FSD architecture), researches SaaS UI patterns, proposes multiple distinct layout paradigms with ASCII wireframes and HTML mockups, iterates through dialogue, and delivers a complete UI-SPEC.md with component trees, data flow, responsive behavior, and interaction patterns — all following Nicolify's design tokens and codebase conventions. Triggers: 'diseña', 'rediseña', 'nueva pantalla', 'concepto visual', 'propuesta de diseño', 'UX', 'layout', 'prototipo', 'mejora la interfaz', 'wireframe', 'mockup', 'esquema de color', 'componentes de pantalla'.

UX agéntico Nicolify. Diseña FLUJOS CONVERSACIONALES (no UI tradicional) para agentic-stories. Toma 01-spec.md y produce 02-design-agentic.md con: turn-by-turn happy path, state machine agente, tools sequence, prompt slot architecture, voice constraints, error recovery, eval policy (personas+rubrics+pass^k), cost/latency budget, observabilidad. Carga skills sales-agent-expert, copilot-expert, tessl__langgraph, claude-api. Si descubre edge cases → delta-spec.md → /po ratifica. Activa cuando user dice: '/ux-agentico', 'diseñemos el flujo conversacional', 'cómo conversa el agente', 'flujo del copilot', 'turn-by-turn', 'experiencia agéntica'.

Use cuando reportes/investigues bug del copilot module: loops infinitos, cards faltantes, conversaciones vacías al refresh, extracción que falla, trazas que mienten, tools que no ejecutan, costos disparados, routing equivocado, prompt cache roto, mutaciones que no persisten, channel format ignorado, voseo en outputs. Activa también para extender (agregar provider, tool, workflow, channel, KB chunk) sin romper invariantes. Triggers: 'bug copilot', 'loop copilot', 'card no aparece', 'conversación vacía', 'documento no extrae', 'agente no responde', 'tool no ejecuta', 'trazas mienten', 'tokens burned', 'extract_document_to_fields falla', 'propose_field_updates no persiste', 'format_for_channel ignored', 'voseo en respuesta', 'cache hit rate', 'cuántos tokens', 'agregar provider', 'agregar workflow', 'agregar tool transversal', 'agregar canal'.

Frontend specialist for Next.js 16 App Router + React 19 + Tailwind + Shadcn UI using Feature-Sliced Design Lite (domain-grouped features/, not traditional layers). Use when: creating responsive layouts, building interactive forms/dashboards, implementing dynamic routes, integrating Shadcn UI components, refactoring UI architecture, configuring Tailwind theming, wiring React Query hooks to backend APIs, or solving Server/Client Component boundaries. Triggers: 'nueva funcionalidad', 'modifica el front', 'crea un componente', 'refactoriza la UI', 'implementa layout', 'configura rutas', 'integra con la API', 'arregla el estilo'.

URDF robot description generation and default generation-time validation. Use when creating, editing, regenerating, inspecting, or debugging `.urdf` files, Python `gen_urdf()` sources, robot links, joints, limits, inertials, visual/collision geometry, mesh references, frame conventions, or generated robot-description artifacts. Use the SRDF skill for MoveIt2 semantic groups and IK/path-planning semantics; use the Replicator artifact review pane for project artifact paths; use the CAD skill for STEP/STL/3MF/DXF/GLB outputs.

SDFormat/SDF model and world generation, validation, and simulator handoff. Use for `.sdf` files, SDFormat XML, Python `gen_sdf()` sources, models, worlds, links, joints, poses, frames, inertials, visual/collision geometry, mesh URIs, sensors, lights, physics, plugins, includes, Gazebo, static SDF review, or simulator-specific metadata. Do not use for signed-distance-field geometry.

Design PCBs as code with tscircuit (React/TSX) and the tsci CLI - schematic, layout, DRC, Gerber/BOM/CPL export for JLCPCB fabrication. Use after the BOM stage when the product needs a custom PCB.

Explicit advanced workflow for generating, inspecting, dry-running, and validating plain FDM `.gcode` with real slicer CLIs. Use only when the user asks Replicator to generate G-code, needs headless/reproducible slicing, or cannot use a slicer UI.

Patch the code so `scripts/local-checks.sh` passes, after /implement-mainspec — a narrow post-implement polish specialist. Reads the (remediation-rich) check failures, fixes the underlying cause, never silences a check, re-verifies, and commits. Invoked headless by the dispatcher's two-strike local-checks gate; the dispatcher owns the retry counter. Triggers - fix-local-checks, fix lint, fix local checks, fix typecheck, make checks pass, post-implement polish (project)

Work on the `snb-worktime-webui` project in the SNB repository: a Go application with an embedded web UI for calculating employee worktime from Windows session snapshots and workstation or network activity windows. Use when adding features, fixing bugs, adjusting parsing rules, changing calculation logic, refining the web UI, updating Windows build flow, or integrating new telemetry sources for this specific project.

Use this skill for Panda CSS work: setting up or migrating @pandacss/dev, editing panda.config.* files, integrating PostCSS or the Panda CLI, using generated styled-system imports, css/cva/recipes/patterns/jsx APIs, tokens and semantic tokens, staticCss or dynamic styling, and troubleshooting missing generated styles or extraction issues.

Integrate and use argon-router in React web applications with Effector. Use when tasks involve creating routes and routers, wiring RouterControls/history adapters, composing routes with chainRoute/group/createVirtualRoute, rendering views with RouterProvider/createRoutesView/Outlet, building links with Link/useLink, and managing URL query state with trackQuery and @argon-router/paths.

Test a client against a Prism mock server built from an OpenAPI spec. Use when the user wants to test against a mock API, drive a client or harness through an OpenAPI spec, verify request payloads or 422 behavior against a spec, or when a task needs a local fake of a REST API for fast, deterministic testing.

Review a Swift change for SwiftUI body complexity, state property wrapper misuse, closure retain cycles, Swift concurrency and Core Data or SwiftData threading hazards, missing accessibility, monetary value handling, and semantic Xcode project or data model changes. Use when reviewing Swift, SwiftUI, UIKit, or iOS app code.

Review a code change for breaking changes to public interfaces, breaking changes shipped without versioning or migration paths, inconsistent error shapes, undocumented behavior changes, overloaded sentinel values, and backward-incompatible type changes. Use when reviewing for API contract stability, backward compatibility, or consumer impact.

Review a code change for schema dump drift, swapped ID or enum mappings, irreversible migrations, missing backfills, deploy-window breaks, orphaned references, broken dual-writes, missing transactions, unsafe hot-table indexes, silent data loss, and missing post-deploy verification. Use when reviewing database migrations, schema changes, or data backfills.

Performs genomic interval overlap, nearest, merge, coverage, complement and subtraction on Polars DataFrames, and reads or writes BED, VCF, BCF, BAM, CRAM, GFF, GTF, FASTA and FASTQ data. Use for coordinate-aware genomic joins, read-depth analysis, lazy bioinformatics I/O, SQL queries or migration from bioframe.

Implements and debugs browser Summarizer, Writer, and Rewriter integrations in JavaScript or TypeScript web apps. Use when adding availability checks, model download UX, session creation, summarize or write or rewrite flows, streaming output, abort handling, or permissions-policy constraints for built-in writing assistance APIs. Don't use for generic prompt engineering, server-side LLM SDKs, or cloud AI services.

Installs, configures, audits, and operates Agent Package Manager (APM) in repositories. Use when initializing apm.yml, installing or updating packages, validating manifests, managing lockfiles, compiling agent context, browsing MCP servers, setting up runtimes, or packaging resolved context for CI and team distribution. Don't use for writing a single skill by hand, generic package managers like npm or pip, or non-APM agent configuration systems.

Implements and debugs browser Language Detector API integrations in JavaScript or TypeScript web apps. Use when adding LanguageDetector support checks, availability and model download flows, session creation, detect() calls, input-usage measurement, permissions-policy handling, or compatibility fallbacks for built-in language detection. Don't use for server-side language detection SDKs, cloud translation services, or generic NLP pipelines.