Design and build beautiful, accessible graphical interfaces — web, desktop (Electron/Tauri), and native (iOS/macOS/Android). Use for visual hierarchy and layout, color and theming (light/dark, semantic tokens, WCAG contrast), typography systems, motion and micro-interactions, accessibility, component systems and design tokens, responsive/adaptive layout, and platform-native idioms. The GUI counterpart to beautiful-cli-design. NOT for terminal/CLI output (use beautiful-cli-design) or API/data schemas.
Capstone/orchestration skill — build an M-Agent + N-Human cooperative IDE in Rust gpui (the Harbor): many agents and humans co-editing the same files as co-equal CRDT replicas, governed by claims/guard/salvage, across LAN/shared/remote harbors. The INDEX that dispatches into the sibling rust skills. Use when building the collaborative editor, the agent-fleet console, multiplayer editing with agents-as-peers, or any slice of the Harbor. Trigger on: cooperative IDE, collaborative editor, multiplayer editor, agents and humans co-editing, gpui IDE, Loro CRDT editor, harbor editor, claims/salvage, "build the cooperative IDE". NOT for: a single non-collaborative gpui screen (compose the siblings directly), web editors, or non-editor apps.
Build and extend pd-console — Port Daddy's GPU-native macOS operator console (GPUI 0.2.x, Zed's Rust UI). Covers the render-agnostic Block/Pane(Surface) contract, the two-thread reqwest↔smol refresh pipeline, Taffy flexbox layout, uniform_list virtual scroll, focus + keyboard nav, the OKLCH theme and ICS maritime flag badges, GPUI's missing text-input, and the real feature-gated cargo/CI gate. Use when adding panes, visual polish, or debugging GPUI rendering/layout/focus in core/pd-console. NOT for the TypeScript daemon, generic Rust toolchain/borrow-checker help (use rust-with-claude-code), or non-pd GPUI apps with a different theme/architecture.
Metal/wgpu/WGSL shader surfaces for native Rust gpui apps (Zed-family, pd-console), stockpiled with beautiful copy-pasteable shader-toy examples. Use for custom GPU fragment passes behind/around gpui panes: ocean/water shaders, pixelated waves and boats, a living harbor, dithered chrome borders, sonar sweeps, aurora/starfields, CRT/scanline post. Trigger on: wgsl, wgpu, metal shader, gpui shader, shadertoy, fragment shader, SDF, noise/fbm, ordered dithering, pixelation, render-to-texture, "pixelated waves and boats", living harbor water. NOT for: web/GLSL/three.js shaders (use a web tool), non-shader gpui motion (use rust-gpui-motion), general GUI layout/color (use beautiful-gui-design), CLI/TUI (use beautiful-cli-design).
Decide HOW LOW to go for a bare-metal 2D/text rendering pipeline on Apple GPUs, and pay the right costs. Covers the layered choice — pure objc2-metal + hand-written MSL (own command queue, glyph atlas, frame pacing) vs wgpu (Metal under the hood, cross-platform) vs Vello-on-wgpu (compute vector renderer you don't have to write) — plus CAMetalLayer/CADisplayLink frame pacing, ProMotion 120Hz, the glyph-atlas / signed-distance-field text problem, CPU-GPU sync, and honest cost accounting of "pure Metal" vs standing on Linebender. Activate on: "objc2-metal", "objc2", "CAMetalLayer", "CADisplayLink", "Metal command queue", "glyph atlas", "SDF text", "ProMotion frame pacing", "bare-metal Rust rendering on macOS", "pure Metal vs wgpu", "MTLDrawable". NOT for: writing the MSL shaders themselves (use metal-shader-expert), the Vello/Parley high-level API (use vello-parley-rendering), 3D engines (use wgpu/bevy), or iOS UIKit drawing.
Design motion, transitions, and bespoke graphics for native Rust gpui apps — the framework behind Zed and the pd-console operator console. Use for with_animation, easing curves, BoxShadow/glow, breathing dots, pane expand/zoom/slide transitions, and custom paint/Vello/wgpu surfaces. Trigger on: gpui animation, with_animation, gpui transition, gpui easing, BoxShadow, gpui shadow, pd-console motion, gpui paint/canvas, Vello, wgpu, "lift/slide/zoom/spring in gpui", reduced-motion in a native Rust UI, "animation re-renders forever", repeat() never stops. NOT for: web/React motion (→ animation-system-architect), CLI/TUI output (→ beautiful-cli-design), general non-motion GUI layout/color/typography (→ beautiful-gui-design).
Effective Rust development with Claude Code as AI pair programmer. Testing patterns, borrow checker idioms, debugging, toolchain workflow, and GPUI-specific Rust patterns for pd-console.
Design, create, audit, and improve Claude Agent Skills with expert-level progressive disclosure. Use when building new skills, reviewing existing skills, debugging activation failures, encoding domain expertise, designing skills for subagent consumption, or understanding platform constraints and distribution surfaces. NOT for general Claude Code features, runtime debugging, non-skill coding, or MCP server implementation.