millionco

Audit and fix Three.js and React Three Fiber apps for frame-loop performance, GPU memory leaks, scene-graph correctness, and visual defects like z-fighting, shadow acne, wrong color space, and broken resize handling. Uses React Doctor as the scanning engine…

Diagnose React runtime performance with React Doctor traces, live render outlines, Long Animation Frames, interaction timing, and component render evidence. Use when invoked as `/performance` for a slow interaction, unexpected re-renders, or a measured…

Use when finishing a feature, fixing a bug, before committing React code, or when the user types `/doctor`, asks to scan, triage, or clean up React diagnostics. Covers lint, accessibility, bundle size, architecture. Includes a regression check and a full…

Compare React Doctor diagnostics for a GitHub pull request (PR) with Daytona. Use when asked to run parity, check a PR for diagnostic regressions, compare a PR with its base, or report added and removed diagnostics.

Audit React Doctor against ReactBench or similar diagnostic benchmark corpora for confirmed false positives, false negatives, taxonomy gaps, and verifier artifacts. Use when analyzing rd.log, rd-before.json, rd-after.json, model.patch, result.json,…

Survey a whole React codebase as a senior React engineer, using React Doctor's scan as evidence, then produce a prioritized audit and self-contained implementation plans for other agents (or cheaper models) to execute. Read-only on source code — it plans…

Fuzz React Doctor rules for crashes, slowness, false positives, and mutation-sensitive diagnostics with @react-doctor/fuzz. Use after rule tests pass, when investigating a fuzz finding, or whenever an eval, review, or user report confirms a new false positive.

Use when finishing a feature, fixing a bug, before committing React code, or when the user types `/doctor`, asks to scan, triage, or clean up React diagnostics. Covers lint, accessibility, bundle size, architecture. Includes a regression check and a full…

Use when editing .tsx/.jsx/.css/.html, React components, pages, routes, forms, styles, or layouts. Also when asked to test, verify, validate, QA, find bugs, check for issues, or fix expect-cli failures.

Systematic evidence-based debugging using runtime logs. Generates hypotheses, instruments code with NDJSON logs, guides reproduction, analyzes log evidence, and iterates until root cause is proven with cited log lines. Use when the user reports a bug,…

React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js…

Write and improve agent skills (SKILL.md files). Use when creating new skills, refactoring existing ones, debugging why an agent ignores instructions, or improving compliance. Covers prompt structure, TDD for skills, description optimization, and…

Enforces Effect-TS patterns for services, errors, layers, and atoms. Use when writing code with Effect.Service, Schema.TaggedError, Layer composition, or effect-atom React components.

Portable Effect patterns for robust promise execution. Use when wrapping async operations with timeouts, retries, tagged errors, caching, concurrency, pattern matching, or tracing - all designed to resolve to a plain Promise via Effect.runPromise.

Perform code reviews. Use when reviewing pull requests, examining code changes, or providing feedback on code quality. Covers security, performance, testing, and design review.

Simplify and refine recently modified code while preserving functionality. Use when asked to "deslop", "clean up code", "simplify code", or after making changes that could benefit from refinement.

CSS and UI animation patterns for responsive, polished interfaces. Use when implementing hover effects, tooltips, button feedback, transitions, or fixing animation issues like flicker and shakiness. Covers animation theory, CSS animations, Framer Motion,…

Fix accessibility issues in UI components. Use when adding or changing buttons, links, inputs, menus, dialogs, tabs, dropdowns, forms, validation, error states, keyboard shortcuts, focus states, or icon-only controls.

Audit and fix HTML metadata including page titles, meta descriptions, canonical URLs, Open Graph tags, Twitter cards, favicons, JSON-LD structured data, and robots directives. Use when adding SEO metadata, fixing social share previews, reviewing Open Graph…

Fix animation performance issues. Use when adding or changing UI animations, refactoring janky interactions, implementing scroll-linked motion, animating layout/filters/masks, or reviewing components that use will-change, transforms, or measurement.

Review code for security issues in self-hosted and managed Vercel deployments of this Slack bot. Covers secrets, tokens, permissions, logs, user data handling, SSRF, and data minimization. Use when reviewing code for security, auditing data handling, checking…

Use when working on Slack agent/bot code, Chat SDK applications, or projects using `chat` and `@chat-adapter/slack`. Provides development patterns, testing requirements, and quality standards.

Use when creating new skills, editing existing skills, or verifying skills work before deployment

Use when working on Slack agent/bot code, Chat SDK applications, or projects using `chat` and `@chat-adapter/slack`. Provides development patterns, testing requirements, and quality standards.

Use when interactive elements that have visual spacing between them (chart bars/columns, list rows, nav items, segmented controls, tabs, calendar cells, icon buttons, legend chips) need hover or click to respond across the whole region with no dead zones.…

Use when implementing Paper MCP, Paper-to-code, design-to-code, Viewfinder, or Paper-exported JSX in React/Next.js apps. Covers component candidates, choosing the canonical artboard among iterations, data-driven charts/visualizations, globals.css tokens for…

Use when a built app that was derived from a Paper design looks "slightly off" versus the design, or to verify a Paper-to-code implementation against its source. Covers using a local paper-sync project as the canonical oracle, porting the real fonts,…

Use when converting Paper canvas or design nodes from absolute positioning to flex or auto-layout. Covers Paper MCP absolute-to-flex restructuring, x-paper-clone preservation, clone z-order, computed spacing, shadow cleanup, SVG/image fidelity, layered cards,…

Use when consolidating, deduping, or reducing the number of CSS custom properties / Tailwind v4 design tokens in a globals.css file. Triggers on requests like "reduce tokens", "standardize design tokens", "too many tokens", "dedupe globals.css", "shrink…

Systematic evidence-based debugging using runtime logs. Generates hypotheses, instruments code with NDJSON logs, guides reproduction, analyzes log evidence, and iterates until root cause is proven with cited log lines. Use when the user reports a bug,…

Use when the user reports jank, dropped frames, janky scrolling, slow click or typing response, poor INP, slow LCP, layout shifts (CLS), unresponsive pages, or asks to debug rendering, animation, or interaction performance in a browser app.

Systematic evidence-based debugging using runtime logs. Generates hypotheses, instruments code with NDJSON logs, guides reproduction, analyzes log evidence, and iterates until root cause is proven with cited log lines. Use when the user reports a bug,…

Research and scope deslop-js detector ideas before implementation. Use when validating a proposed finding, grounding it in JavaScript/TypeScript/module-system behavior, fixture evidence, false-positive traps, detector precision, or v1 non-goals.

Validate implemented deslop-js detectors before PR or merge. Use after focused tests pass to review correctness, inspect false positives, update docs/changesets, write PR descriptions, and triage review comments.

Implement deslop-js detectors from a validated finding contract. Use when adding or changing dead-code, dependency, import/export graph, redundancy, DRY, or TypeScript semantic findings, fixtures, public types, or report wiring.

Use when wrapping CLI binaries in JavaScript, automating shell workflows in TypeScript, composing multiple CLIs into scripts, or building agent tool-use. Covers convertCliToJs, $command, $validate, $spawn, script(), .text()/.lines()/.json() output parsing.

Use when making single-property CSS or Tailwind visual changes in Next.js App Router projects. Presents a floating control widget on the page so the user can tweak the value before it is persisted. Covers atomic style changes, live preview, and cleanup.…

Run adversarial browser tests against code changes. Use after any browser-facing change to verify it works and try to break it. Prefer this over raw browser tools (Playwright MCP, chrome tools).

Sets a repository up with Million UI, governs how a UI change lands, and answers a design call from Ben's recorded decrees. Use when installing or migrating to Million UI, when creating or changing user-visible UI, or when making a design call.