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Analyzes web and mobile applications for WCAG 2.2 AA accessibility compliance. Audits code (HTML, React, React Native, SwiftUI), interprets automated tool output, and processes manual tester findings. Produces structured audit reports that implementation agents can action. Use this skill when conducting accessibility audits, reviewing code for a11y issues, or synthesizing accessibility test results.

Design RESTful APIs with consistent patterns, clear conventions, and comprehensive documentation. Covers endpoint design, HTTP methods, status codes, request/response formats, pagination, filtering, versioning, authentication, and OpenAPI specifications. Use this skill when designing new APIs, reviewing API designs, or establishing API standards for a project or organization.

Test APIs with integration tests, contract tests, and E2E validation. Covers Jest, Vitest, and Supertest for Node.js/TypeScript APIs. Includes test data management, fixtures, factories, environment configuration, CI/CD integration, mocking external services, and contract testing with OpenAPI validation. Use this skill when building test suites for REST APIs, validating API contracts, or setting up API testing infrastructure.

Review project architecture, identify structural issues, and plan refactoring. Analyzes directory structure, module boundaries, dependencies, and code organization. Provides systematic approaches for cleanup, restructuring, and migration. Primary focus on TypeScript/JavaScript projects with patterns applicable to other languages. Use this skill when auditing codebases, planning refactors, or improving project organization.

Create, review, debug, and optimize CI/CD pipelines across platforms. Covers GitHub Actions, GitLab CI, CircleCI, Azure DevOps, and Bitbucket Pipelines. Use this skill when creating new pipelines, debugging failing builds, implementing deployment strategies (blue-green, canary, rolling), reviewing pipelines for security and efficiency, or optimizing build times. Triggers on "ci", "cd", "pipeline", "deployment", "github actions", "gitlab ci", "workflow", "build failing", "deploy to staging/production".

Design database schemas, plan migrations, optimize queries, and manage data models. Covers relational databases (PostgreSQL, MySQL, SQLite), document databases (MongoDB), and ORM integration (Prisma, Drizzle, TypeORM). Use this skill when designing schemas, reviewing data models, planning migrations, optimizing slow queries, or establishing database patterns for a project. Triggers on "database", "schema", "migration", "model", "query optimization", "index", "normalize/denormalize".

Extended investigation for technology evaluation, competitive analysis, architectural exploration, and best practices research. Unlike spike (time-boxed hours), deep-research supports multi-day comprehensive investigation producing reports for major decisions. Triggers on "research X solutions", "compare frameworks for our use case", "evaluate vendors for X", "what are best practices for Y", "how do competitors handle Z", or any investigation requiring comprehensive analysis across multiple sources.

Create and maintain technical documentation including READMEs, API docs, architecture decision records (ADRs), and user guides. Use this skill when writing project documentation, documenting APIs, recording architectural decisions, creating how-to guides, or establishing documentation standards. Triggers on "documentation", "readme", "docs", "adr", "architecture decision", "api docs", "user guide", "document this".

Comprehensive error handling patterns for robust applications including custom errors, error boundaries, recovery strategies, and user-facing error messages. Use this skill when designing error hierarchies, implementing React error boundaries, adding retry logic or fallbacks, creating API error responses, integrating error tracking (Sentry), or improving user error communication. Triggers on "error handling", "error boundary", "custom error", "retry logic", "graceful degradation", "error tracking", "Sentry", "user error message", "try-catch", "Result type", "circuit breaker".

Creates high-converting marketing websites with persuasive copy, clear value propositions, and effective page structures. Activates when building landing pages, marketing sites, product pages, or any website focused on conversion (signups, sales, leads). Covers copywriting frameworks, page patterns, SEO essentials, and conversion optimization for web and mobile. Use this skill for any marketing or promotional web presence.

Implement logging, metrics, tracing, and alerting for production applications. Covers structured logging (Pino, Winston), metrics (Prometheus, DataDog, CloudWatch), distributed tracing (OpenTelemetry), and alert design. Use this skill when adding logging to services, setting up monitoring, creating alerts, debugging production issues, or designing SLIs/SLOs. Triggers on "logging", "monitoring", "alerting", "observability", "metrics", "tracing", "debug production", "correlation id", "structured logging", "dashboards", "SLI", "SLO".

Performance analysis, optimization techniques, and performance testing for web applications. Covers profiling, bottleneck identification, frontend optimization (bundle size, rendering, Core Web Vitals), backend optimization (query optimization, caching, async patterns), load testing (k6, Artillery), and monitoring (performance budgets, SLIs). Use this skill when analyzing performance issues, optimizing slow pages or APIs, setting up load testing, implementing caching, reducing bundle sizes, or establishing performance budgets. Triggers on "performance", "slow", "optimize", "bundle size", "load testing", "cache", "bottleneck", "latency", "Core Web Vitals", "LCP", "FCP", "lighthouse", "profiling".

Comprehensive persona research and creation covering the full pipeline from user research to validated personas and journey maps. Includes traditional personas, proto-personas, JTBD profiles, and empathy maps. Activates when creating user personas, conducting user research, defining target audiences, mapping user journeys, or applying Jobs-to-be-Done framework. Use this skill for deep user understanding work. Extends the ux-design skill with specialized persona methodology.

Guided plan revision with impact analysis. Supports explore mode (discover what to change) and direct mode (apply known changes). Always shows impact before execution.

Orchestrates long-running AI development sessions with human checkpoint control. Uses ohno for task management, manages progress tracking, routes work to appropriate skills, and implements supervised/semi-auto/autonomous modes. Use this skill when starting work sessions, resuming interrupted work, or managing multi-session projects.

Create, extract, and publish TypeScript SDKs. Covers analyzing existing applications to extract reusable logic, designing clean SDK APIs, implementing typed clients with proper error handling, bundling for multiple targets (ESM/CJS/browser), and publishing to npm (public or private registries). Use this skill when building SDKs, extracting shared code into packages, or creating developer tooling libraries.

Security review of application code, dependencies, configurations, and architecture. Covers OWASP Top 10, dependency scanning, secret management, authentication patterns, and API security. Use this skill when reviewing security of code, auditing dependencies for vulnerabilities, checking configuration security, assessing API endpoints, or answering security concerns about implementations. Triggers on "security", "audit", "vulnerability", "CVE", "OWASP", "injection", "XSS", "CSRF", "authentication security", "authorization flaw".

Analyzes completed agent sessions to identify what went well, what went wrong, and patterns to improve. Reads from .claude/ folder (session logs, progress.md, git history) and produces actionable insights. Use after completing work sessions to learn from agent behavior and improve future runs.

Time-boxed technical investigation with structured output. Use for feasibility studies, architecture exploration, integration assessment, performance analysis, or risk evaluation. Creates spike tasks in ohno, enforces time-boxing, generates spike reports, and creates actionable follow-up tasks. Triggers on "spike on X", "investigate whether we can", "how hard would it be to", "what's the best approach for", or any exploratory technical question needing bounded research.

Comprehensive test architecture, coverage strategy, and test design beyond API testing. Covers test pyramid design, frontend/component testing (React Testing Library, Vue Test Utils), E2E testing (Playwright, Cypress), visual regression, mocking strategies (MSW), and flaky test prevention. Use this skill when designing test architecture, determining what test type to use, setting up component or E2E testing, debugging flaky tests, reviewing coverage strategy, or organizing test files. Triggers on "test strategy", "what to test", "coverage", "e2e", "playwright", "cypress", "component test", "flaky test", "test pyramid".

Comprehensive UX design guidance covering research, information architecture, interaction patterns, and accessibility. Activates on ANY UI/UX work including user flows, navigation, forms, onboarding, error handling, and responsive design. Covers both process (Design Thinking, user research, personas) and implementation (patterns, accessibility, mobile UX). Use this skill for all user experience decisions on web and mobile platforms.