Use when advanced Jest features including custom matchers, parameterized tests with test.each, coverage configuration, and performance optimization.

Generates jest.config.cjs for unit testing configuration. Configures Jest with Vue, TypeScript support, coverage thresholds, and test environment settings.

Use when jest configuration, setup files, module resolution, and project organization for optimal testing environments.

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Comprehensive React component testing with Jest and React Testing Library covering configuration, mocking strategies, async testing patterns, hooks testing, and integration testing best practices

Execute and generate Jest tests for JavaScript/TypeScript projects with support for unit, integration, and E2E testing

Use when jest testing patterns including unit tests, mocks, spies, snapshots, and assertion techniques for comprehensive test coverage.

Tests JavaScript and TypeScript applications with Jest test runner including mocking, snapshot testing, and code coverage. Use when setting up testing, writing unit tests, or when user mentions Jest, test runner, or JavaScript testing.

Use when JetBrains MCP tools are available (mcp__jetbrains__*) - enforces IDE-native workflow with problem checking after file completion, and smart refactoring tools instead of grep/sed

Expert assistant for Juju charm development using jhack utilities. Use when debugging charms, inspecting relations, syncing code, replaying events, testing scenarios, or performing rapid development iterations. Keywords include jhack, Juju debugging, charm testing, relation inspection, event replay, sync, tail, fire, show-relation, show-stored.

Jinling (JILN) connector MPN encoding, position-based part numbering for pin headers, female headers, and IDC connectors.

Complete Jira Cloud REST API documentation for v2 and v3 endpoints. Use when working with Jira APIs, making Jira API calls, troubleshooting Jira integrations, or needing endpoint details. DO NOT use for general Jira usage questions or Jira web UI help.

jira-api

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Use jira CLI for Jira operations including issue management, project queries, transitions, and JQL search

Search Jira issues using JQL queries. Use when filtering issues by project, status, assignee, date, or building reports.

Automate JIRA ticket status transitions after pull requests are merged, ensuring proper workflow closure

Jira wiki markup syntax validation, templates, and formatting guidance. Use when: (1) Writing Jira issue descriptions or comments, (2) Converting Markdown to Jira wiki markup, (3) Requesting bug report or feature request templates, (4) Validating Jira syntax before submission, (5) Keywords like 'jira format', 'wiki markup', 'jira syntax', 'format for jira', (6) Ensuring content uses h2./h3. headings instead of Markdown ##, (7) Checking code blocks use {code:lang} not triple backticks, (8) Any task involving Jira text formatting

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This skill should be used when estimating development time for Jira tickets. It provides both manual and AI-assisted estimates with T-shirt sizes, story points, and phase-by-phase time breakdowns based on task type classification, complexity scoring, and project architecture (monolithic/serverless/frontend/fullstack/mobile/test_automation).

Control Chrome browser via CLI for testing, automation, and debugging. Use when the user needs browser automation, screenshots, form filling or page inspection.

Start working on a Jira issue with optimized tiered orchestration. Begins with intelligent question-gathering to ensure complete understanding before implementation.

Jira ticket creation and management for AI agent commands, with severity-based processing and proper integration

Interact with Jira

Master Jito bundles for MEV protection and priority fee optimization on Solana - bundle submission, tip strategies, and transaction landing. Use for trading bots, high-priority transactions, and MEV-aware applications.

Create a jj bookmark for the current commit with a descriptive name

Create a jj commit from current working copy with auto-generated description

Generate and set a commit description for a commit in jj

Create isolated jj workspaces for testing changes, running experiments in parallel, and exploring alternative implementations. Use when testing breaking changes, comparing different approaches, or running long-running operations without blocking other work. (project)

Reference guide for jj (Jujutsu) version control operations

Search the JLCPCB electronic components database (~7 million parts) for hardware/electronics projects. Use when the user needs to: (1) Find electronic components (resistors, capacitors, ICs, connectors, etc.), (2) Look up specific part numbers or manufacturers, (3) Find alternatives or equivalents for components, (4) Check component availability and stock at JLCPCB, (5) Get component specifications (package type, description, etc.), or (6) Search for parts for PCB assembly projects.

You are an expert in Job Shop Scheduling and production sequencing optimization. Your goal is to help determine the optimal sequence of operations on machines to minimize completion time (makespan), t

Diagnose and improve humor using systems thinking. Use when jokes fall flat, when humor feels forced, when punchlines don't land, or when you want to systematically enhance comedic writing. Treats jokes as engineerable connection systems.

Editor for non-fiction texts. The audience is business analysts and senior managers.

Validates CDP journey YAML configurations against tdx schema requirements. Use when reviewing journey structure, checking step types and parameters, verifying segment references, or troubleshooting journey configuration errors before pushing to Treasure Data.

Build and optimize JQL (Jira Query Language) queries for searching issues. Use when the user needs to search Jira issues, filter by complex criteria, find specific bugs or features, or when they mention JQL, queries, or searching Jira.

jquery-4

Enforce ESLint standards by fixing violations systematically

Fix JSDoc errors and warnings from build/lint with content preservation

JavaScript style and best practices based on Google's official JavaScript Style Guide. This skill should be used when writing, reviewing, or refactoring JavaScript code to ensure consistent style and prevent common bugs. Triggers on tasks involving JavaScript, ES6, modules, JSDoc, naming conventions, or code formatting.

Interpretive guidance for JavaScript/TypeScript code quality using biome (modern) or eslint+prettier (traditional). Use when linting JS/TS files, configuring JS/TS tools, troubleshooting lint errors, or understanding tool selection.

JavaScript and TypeScript best practices covering naming conventions, control flow, state management, TypeScript patterns (avoid any/enum, prefer type over interface), safety (input validation, assertions, error handling), performance optimization (reduce branching/looping, memoization, defer await, cache property access, storage API caching, avoid needless allocations, currying for hot paths), and documentation (JSDoc, comment markers). Use when writing JS/TS functions, refactoring code for performance, reviewing code quality, fixing type errors, optimizing loops or conditionals, adding validation, or improving error messages.

Implement, refactor, or review worker-based multithreading in TypeScript/JavaScript apps (browser or Node). Use when offloading CPU-heavy loops to Web Workers, setting up a worker pool, moving data across threads, or diagnosing worker crashes, slowdowns, or synchronization bugs.

jscodeshift codemod development best practices from Facebook/Meta. This skill should be used when writing, reviewing, or debugging jscodeshift codemods. Triggers on tasks involving AST transformation, code migration, automated refactoring, or codemod development.

Debug jsgui3 client-side activation issues. Use when SSR renders but clicks don’t work, this.dom.el is null, or you see Missing context.map_Controls / activation failures.

Use when designing or polishing jsgui3 UIs in the WLILO style (White Leather + Industrial Luxury Obsidian): tokens, panels, tables, icon actions, and interaction-safe styling. Triggers: jsgui3 ui design, wlilo ui, dashboard styling, table styling, controls styling, obsidian panel, white leather background.

JavaScript/TypeScript static analysis tool for call graphs, unused code detection (tree shaking), dependency analysis, and circular dependency detection

Formats and validates JSON data. Use when you need to pretty-print JSON, fix formatting issues, or validate JSON syntax. ALWAYS USE THIS when doing JSON Formatting

Transform, manipulate, and analyze JSON data structures with advanced operations.