Robert (Masa) Matsuoka

Minimal, unopinionated state management library for React with simple hook-based API, no providers, and minimal boilerplate for global state without Redux complexity.

TypeScript-first schema validation library with static type inference for form validation, API validation, and runtime type checking with compile-time types.

Xquik X data automation API - Use REST or MCP for tweet search, user lookup, follower exports, media downloads, monitors, webhooks, giveaway draws, and confirmation-gated X actions.

Working with Excel files programmatically.

Create detailed implementation plans with bite-sized tasks for engineers with zero codebase context

WordPress plugin and theme testing with PHPUnit integration tests, WP_Mock unit tests, PHPCS coding standards, and CI/CD workflows

Security-first WordPress development with nonces, sanitization, validation, and escaping to prevent XSS, CSRF, and SQL injection vulnerabilities.

Modern WordPress plugin development with PHP 8.3+, OOP architecture, hooks system, database interactions, and Settings API

Modern WordPress block development and Full Site Editing with theme.json, block themes, and custom blocks for WordPress 6.7+

Advanced WordPress development with REST API endpoints, WP-CLI commands, performance optimization, and caching strategies for scalable applications.

Comprehensive web application testing patterns with Playwright selectors, wait strategies, and best practices

Optimize web performance using Core Web Vitals, modern patterns (View Transitions, Speculation Rules), and framework-specific techniques

Vue 3 - Progressive JavaScript framework with Composition API, reactivity system, single-file components, Vite integration, TypeScript support

Vitest - Modern TypeScript testing framework with Vite-native performance, ESM support, and TypeScript-first design

Vite lightning-fast build tool with instant HMR, ESM-first architecture, and zero-config setup for modern web development

Run verification commands and confirm output before claiming success

Vercel account, team, and billing management including plans and spend controls. Use when managing teams, accounts, or cost governance on Vercel.

Vercel data and storage services including Postgres, Redis, Vercel Blob, Edge Config, and data cache. Use when selecting data storage or caching on Vercel.

Vercel security and access controls including RBAC, SSO, deployment protection, firewall, bot defense, audit logs, and 2FA. Use when securing Vercel projects or managing access.

Vercel platform overview for onboarding, projects, CLI, Git integration, environment variables, project configuration, REST API, and webhooks. Use when planning or operating workloads on Vercel.

Vercel observability for Web Analytics, Speed Insights, logs, tracing, alerts, and observability tooling. Use when monitoring performance or debugging production behavior on Vercel.

Vercel networking and routing for domains, DNS, redirects, rewrites, headers, CDN, edge cache, and regions. Use when configuring routing or traffic behavior on Vercel.

Vercel Functions and Edge Runtime, including cron jobs and routing middleware. Use when building APIs, serverless workloads, or scheduled tasks on Vercel.

Vercel deployment lifecycle for builds, deployments, previews, release phases, and rollback. Use when configuring build output, deployment workflows, or release controls on Vercel.

Vercel AI platform guidance covering AI SDK, AI Gateway, Vercel Agent, and MCP. Use when building AI-powered or agentic workloads on Vercel.

Vector search indexing and querying workflows using MCP Vector Search, including setup, reindexing, auto-index strategies, and MCP integration.

Classic VB6 patterns, COM interop, migration strategies

Windows Forms development patterns, UI threading, data binding

ADO.NET patterns, Entity Framework, database best practices

Core VB.NET patterns, type safety, modern language features

Type-safe API route handler with automatic Zod validation for Next.js App Router...

Advanced TypeScript patterns and best practices for 2025

High-performance monorepo build system with intelligent caching, task orchestration, and parallel execution for multi-package repositories and microservices.

tRPC end-to-end type-safe APIs for TypeScript with React Query integration and full-stack type safety

Threat modeling workflow for software systems: scope, data flow diagrams, STRIDE analysis, risk scoring, and turning mitigations into backlog and tests. Use when designing new features, reviewing architecture changes, handling sensitive data, or hardening auth/payment/multi-tenant flows.

Never test mock behavior. Never add test-only methods to production classes. Understand dependencies before mocking. Language-agnostic principles with TypeScript/Jest and Python/pytest examples.

Test quality inspection framework for reviewing test coverage, identifying gaps, and ensuring comprehensive validation

Comprehensive TDD patterns and practices for all programming languages, eliminating redundant testing guidance per agent.

Terraform infrastructure-as-code workflow patterns: state and environments, module design, safe plan/apply, drift control, and CI guardrails

Advanced Tauri event patterns for bidirectional communication, streaming data, window-to-window messaging, and custom event handling

TanStack Query (React Query) for asynchronous server-state management with automatic caching, background refetching, optimistic updates, and pagination in React applications.

Tailwind CSS utility-first framework for rapid UI development with responsive design and dark mode

Step-by-step debugging workflow: reproduce the bug, isolate the failing component, trace to root cause, apply a targeted fix, and verify the fix resolves the issue without regressions. Use when you encounter a bug, error, exception, crash, or unexpected behavior that needs troubleshooting.

SvelteKit - Full-stack Svelte framework with file-based routing, SSR/SSG, form actions, and adapters for deployment

Svelte 5 runes + SvelteKit adapter-static (SSG/SSR) patterns for hydration-safe state, store bridges, and reactivity that survives prerendering

Svelte 5 - Reactive UI framework with compiler magic, Runes API, SvelteKit full-stack framework, SSR/SSG, minimal JavaScript

Supabase open-source Firebase alternative with Postgres, authentication, storage, and realtime subscriptions. Use when building full-stack applications requiring integrated backend services with Next.js, React, or Vue.

Create and manage stacked (dependent) pull requests for complex features

SQLAlchemy Python SQL toolkit and ORM with powerful query builder, relationship mapping, and database migrations via Alembic

Spring Boot 3.x - Java framework for production-ready applications with dependency injection, REST APIs, data access, security, and actuator monitoring

Compare tradeoffs and recommend architectural patterns — dependency injection, service-oriented architecture, repository, domain events, circuit breaker, and anti-corruption layer. Use when choosing between design patterns, planning microservices boundaries, evaluating system design alternatives, or asking 'which pattern should I use' for a specific coupling or resilience problem.

Guide for creating effective skills

shadcn/ui component library for React with Tailwind CSS - copy-paste accessible components with full code ownership

AI session compression techniques for managing multi-turn conversations efficiently through summarization, embedding-based retrieval, and intelligent context management.

CI security scanning: secrets, deps, SAST, triage, expiring exceptions

SEC EDGAR extraction pipeline: setup, filing discovery by CIK, recipe-driven extraction, and report generation.

Visual verification workflow for UI changes to accelerate code review and catch ...

PM-invocable protocol for running and interpreting Rust quality gates in the trusty-tools monorepo: fmt, clippy, and test in strict sequence before any merge

Systematically trace bugs backward through call stack to find original trigger

Dispatch code-reviewer subagent to review implementation against plan or requirements before proceeding

Reporting pipelines for CSV/JSON/Markdown exports with timestamped outputs, summaries, and post-processing.

Building reusable React state machine skills with XState v5 and the actor model

Advanced React hooks composition patterns - SWR integration, debounced search, memoized contexts, state machines, and performance optimization

General React fundamentals - components and JSX, props and state, the core hooks (useState/useEffect/useRef/useMemo/useCallback/useContext), composition, conditional and list rendering, and controlled inputs. The canonical "depends on React" reference.

Modern React 19 platform features and rendering architecture - the React Compiler (auto-memoization) and how it changes memoization guidance, concurrent rendering (useTransition/useDeferredValue/Suspense), the use() hook, Actions (useActionState/useOptimistic/useFormStatus), ref-as-prop and Context-as-provider changes, compound components, context selectors, error boundaries, portals, virtualization, code-splitting, and the RSC/'use client' boundary.

pytest - Python's most powerful testing framework with fixtures, parametrization, plugins, and framework integration for FastAPI, Django, Flask

Pyright fast Python type checker from Microsoft with VS Code integration and strict type checking modes

Python data validation using type hints and runtime type checking with Pydantic v2's Rust-powered core for high-performance validation in FastAPI, Django, and configuration management.

Prisma ORM for TypeScript - Type-safe database toolkit with schema-first development, auto-generated client, migrations, relations, and Prisma Studio

Comprehensive verification workflow before merging changes to production.

PR quality checklist for ensuring comprehensive, well-documented pull requests. Use before submitting PRs to improve review efficiency and code quality.

Playwright modern end-to-end testing framework with cross-browser automation, auto-wait, and built-in test runner

Phoenix operations and deployment: releases, runtime configuration, clustering, libcluster, telemetry/logging, secrets, assets, background jobs, and production hardening on the BEAM.

Phoenix Framework with LiveView on the BEAM

Phoenix controllers, JSON APIs, Channels, and Presence on the BEAM

ONNX Runtime in Rust via the `ort` crate (2.x): loading sessions, configuring CPU/CoreML/CUDA execution providers, tensor I/O with ndarray, async-safe spawn_blocking wrapping, global thread-pool init, and debugging provider/opset issues

OpenTelemetry observability patterns: traces, metrics, logs, context propagation, OTLP export, Collector pipelines, and troubleshooting

OpenRouter unified AI API - Access 200+ LLMs through single interface with intelligent routing, streaming, cost optimization, and model fallbacks

Node.js backend development with TypeScript, Express/Fastify servers, routing, middleware, and database integration

Next.js 16 migration guide (async request APIs, "use cache", Turbopack)

Core Next.js patterns for App Router development including Server Components, Server Actions, route handlers, data fetching, and caching strategies

Next.js environment variable management with file precedence, variable types, and deployment configurations. Use when configuring Next.js applications, managing environment-specific settings, or deploying to Vercel/Railway/Heroku.

Netlify JAMstack deployment platform with serverless functions, forms, and identity

Neon serverless Postgres with autoscaling, instant database branching, and zero-downtime deployments. Use when building serverless applications, implementing database branching for dev/staging, or deploying with Vercel/Netlify.

mypy - Static type checker for Python with gradual typing, strict mode, Protocol support, and framework integration

Reference implementation demonstrating the Command → Agent → Skill orchestration pattern in Claude MPM, showing both preloaded-skill and dynamic-skill-invocation styles

MongoDB - NoSQL document database with flexible schema design, aggregation pipelines, indexing strategies, and Spring Data integration

MCP (Model Context Protocol) server build and evaluation guide, including local conventions for tool surfaces, config, and testing

MCP (Model Context Protocol) - Build AI-native servers with tools, resources, and prompts. TypeScript/Python SDKs for Claude Desktop integration.

FFmpeg-based media transcoding workflows with preset-driven conversions, batch processing, and safe backups for web/mobile/archive outputs.

Local LLM operations with Ollama on Apple Silicon, including setup, model pulls, chat launchers, benchmarks, and diagnostics.

LinkedIn automation via the Linked API CLI - fetch profiles, search people and companies, send messages, manage connections, create posts, react, comment, and run Sales Navigator and custom workflows. Use when the user wants to interact with LinkedIn.

LangGraph framework for building stateful, multi-agent AI applications with cyclical workflows, human-in-the-loop patterns, and persistent checkpointing.

LangChain LLM application framework with chains, agents, RAG, and memory for building AI-powered applications

Kysely type-safe SQL query builder - End-to-end type safety from schema to queries, migrations, transactions, plugins

Kubernetes operations playbook for deploying services: core objects, probes, resource sizing, safe rollouts, and fast kubectl debugging

Working effectively with JSON data structures.

Jest with TypeScript - Industry standard testing framework with 70% market share, mature ecosystem, React Testing Library integration

Framework for writing concise 3P (Progress, Plans, Problems) team updates for executives and stakeholders

Hono request validation with Zod, TypeBox, Valibot - type-safe input validation for JSON, forms, query params, and headers

Hono testing patterns - app.request(), test client, mocking environment, and integration testing strategies

Hono RPC - end-to-end type-safe API client generation with hc client and TypeScript inference

Hono middleware patterns - creation, composition, built-in middleware, and execution order for web applications

Hono JSX - server-side rendering, streaming, async components, and HTML generation patterns

Hono ultrafast web framework fundamentals - routing, context, handlers, and response patterns for multi-runtime deployment

Hono on Cloudflare Workers - bindings, KV, D1, R2, Durable Objects, and edge deployment patterns

Homebrew formula maintenance workflows for Python CLIs and taps, including version bumps, SHA/resource updates, testing, audits, and releases.

Headless UI - Unstyled, fully accessible UI components for React and Vue with built-in ARIA patterns

GraphQL query language and runtime for APIs enabling clients to request exactly the data they need with strongly-typed schemas and single endpoint architecture.

Comprehensive Go testing strategies including table-driven tests, testify assertions, gomock interface mocking, benchmark testing, and CI/CD integration

Instrumenting Go applications with OpenTelemetry for distributed tracing, Prometheus for metrics, and structured logging with slog

Go HTTP API development with net/http, Chi, Gin, Echo, and Fiber frameworks

Production gRPC in Go: protobuf layout, codegen, interceptors, deadlines, error codes, streaming, health checks, TLS, and testing with bufconn

Go database integration patterns using sqlx, pgx, and migration tools like golang-migrate

Go concurrency patterns for production services: context cancellation, errgroup, worker pools, bounded parallelism, fan-in/fan-out, and common race/deadlock pitfalls

Building production-quality CLI tools with Cobra command framework and Viper configuration management

GitHub Actions CI/CD workflows for automating build, test, and deployment

Use git worktrees for parallel development on multiple branches simultaneously

Essential Git patterns for effective version control, eliminating redundant Git guidance per agent.

Reliably drive the GitHub gh CLI for issue, PR, and label operations in automation and subagent environments, with pre-flight verification so you never fabricate a success or a fake issue URL.

FlexLayout for React - Advanced docking layout manager with drag-and-drop, tabs, splitters, and complex window management

Flask - Lightweight Python web framework for microservices, REST APIs, and flexible web applications with extensive extension ecosystem

Production Fastify (TypeScript) patterns: schema validation, plugins, typed routes, error handling, security hardening, logging, testing with inject, and graceful shutdown

FastAPI dev/prod runbook (Uvicorn reload, Gunicorn)

Production-ready Express.js development covering middleware architecture, error handling, security hardening, testing strategies, and deployment patterns

Example of a properly self-contained skill following all best practices

Comprehensive guide for developing on EspoCRM - metadata-driven CRM with service layer architecture

Environment variable validation, security scanning, and management for Next.js, Vite, React, and Node.js applications

Emergency release workflow for critical bug fixes and security patches. Use when production issues require fast-track deployment.

Ecto patterns for Phoenix/Elixir apps. Covers schemas, changesets, migrations, queries, Ecto.Multi, transactions, constraints, associations, pagination, tenant partitioning, performance, and testing.

DSPy declarative framework for automatic prompt optimization treating prompts as code with systematic evaluation and compilers

Migration-first database development workflow using Drizzle ORM for TypeScript/J...

Type-safe SQL ORM for TypeScript with zero runtime overhead

Docker containerization for packaging applications with dependencies into isolated, portable units ensuring consistency across development, testing, and production environments.

Django full-featured Python web framework with batteries included (ORM, admin, auth)

Use multiple Claude agents to investigate and fix independent problems concurrently

DigitalOcean Teams and Organizations for billing, access control, roles, and membership. Use when managing team structure, permissions, and organization-wide billing on DigitalOcean.

DigitalOcean storage services including Spaces object storage, Volumes block storage, NFS, Snapshots, and Backups. Use when selecting or managing storage for DigitalOcean workloads.

DigitalOcean platform overview for account setup, projects, tooling (Control Panel, doctl, API, Terraform), and service selection across compute, storage, databases, networking, management, and teams. Use when onboarding or planning DigitalOcean usage.

DigitalOcean networking services including VPC, firewalls, load balancers, reserved IPs, DNS, IPv6, and NAT gateway. Use when designing or securing network connectivity for DigitalOcean workloads.

DigitalOcean management services for monitoring, uptime checks, and resource organization with Projects. Use when setting up observability, alerts, and operational visibility on DigitalOcean.

DigitalOcean Managed Databases for PostgreSQL, MySQL, Redis, MongoDB, Kafka, OpenSearch, and Valkey. Use when provisioning, scaling, or operating managed database clusters on DigitalOcean.

DigitalOcean containers and images including Container Registry, preconfigured images, and custom images. Use when building, storing, or deploying container images or Droplet images on DigitalOcean.

DigitalOcean compute services covering Droplets, App Platform, Functions, Kubernetes (DOKS), GPU Droplets, and Bare Metal GPUs. Use when selecting or provisioning compute for applications, containers, or serverless workloads.

DigitalOcean Gradient AI agentic cloud and AI platform for building, training, and deploying AI agents on GPU infrastructure with foundation models, knowledge bases, and agent routes. Use when planning or operating AI agents on DigitalOcean.

Build cross-platform desktop applications with Rust using Tauri framework and native GUI alternatives

Dependency audit and cleanup workflow for maintaining healthy project dependencies. Use for regular maintenance, security updates, and removing unused packages.

Full-stack observability with Datadog APM, logs, metrics, synthetics, and RUM. Use when implementing monitoring, tracing, alerting, or cost optimization for production systems.

Safe patterns for evolving database schemas in production with decision trees and troubleshooting guidance.

Tailwind CSS component library providing semantic class names for 50+ components with built-in themes, dark mode, and customization for rapid UI development.

Cypress end-to-end and component testing patterns for web apps: reliable selectors, stable waits, network stubbing, auth handling, CI parallelization, and flake reduction

Replace arbitrary timeouts with condition polling for reliable async tests

Severity-tagged code review checklist (CRITICAL/HIGH/MEDIUM/LOW) used by code-critic agent

Vendor-neutral framework for scoring software health, estimating technical debt, assessing cloud readiness and open-source safety, and communicating quality to business stakeholders. Use when you need to quantify code health at the application or portfolio level rather than fix individual findings.

Python code-quality anti-patterns and review checks: exception-hierarchy correctness, singleton identity comparison, narrow exception handling, wildcard-import avoidance, magic-number naming, and dead-local removal. Use when reviewing or self-reviewing Python code for correctness and readability defects that linters and reviewers should catch.

Six-stage quality-gate pipeline for any code implementation task

Build production Rust CLIs with Clap: subcommands, config layering, validation, exit codes, shell completions, and testable command surfaces

Distributed task queue system for Python enabling asynchronous execution of background jobs, scheduled tasks, and workflows across multiple workers with Django, Flask, and FastAPI integration.

PM-invocable protocol for Cargo publish and release operations in the trusty-tools Rust monorepo: semver rules, 10-step release sequence, macOS codesign safety, and cross-crate dependency ordering

Systematic workflow for verifying bug fixes to ensure quality and prevent regres...

Interactive idea refinement using Socratic method to develop fully-formed designs

Biome - Fast all-in-one toolchain for web projects (linter + formatter in Rust, 100x faster than ESLint)

Better Auth plugin system for TypeScript. Use when adding advanced auth features (2FA, magic link, passkey, username, JWT, organizations) via server and client plugins.

Better Auth framework integrations for TypeScript. Use when wiring route handlers in Next.js, SvelteKit, Remix, Express, Hono, or other web frameworks.

Better Auth core setup for TypeScript apps. Use when configuring the Better Auth instance, wiring server handlers and client instances, working with sessions, or calling server-side auth APIs.

Better Auth authentication flows for TypeScript apps. Use when enabling email/password auth, configuring social providers, or implementing sign-up, sign-in, and verification flows.

ANTI-PATTERN - Example showing violations of self-containment (DO NOT COPY)

Axum (Rust) web framework patterns for production APIs: routers/extractors, state, middleware, error handling, tracing, graceful shutdown, and testing

Python asyncio - Modern concurrent programming with async/await, event loops, tasks, coroutines, primitives, aiohttp, and FastAPI async patterns

Suite of tools for creating elaborate, multi-component claude.ai HTML artifacts using modern frontend web technologies (React, Tailwind CSS, shadcn/ui)

API security checklist for reviewing endpoints before deployment. Use when creating or modifying API routes to ensure proper authentication, authorization, and input validation.

Best practices for documenting APIs and code interfaces, eliminating redundant documentation guidance per agent.

Comprehensive API design patterns covering REST, GraphQL, gRPC, versioning, authentication, and modern API best practices

Official Anthropic SDK for Claude AI with chat, streaming, function calling, and vision capabilities