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

Use when writing Jest tests - covers testing patterns for interpreters, parsers, and async code

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.

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.

Authenticate with Jira Cloud REST API using API tokens. Use when setting up Jira connections, validating credentials, or handling rate limiting.

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JIRA integration specialist for SpecWeave increments with epic creation, bidirectional sync, and status updates. Use when creating JIRA issues, syncing task completion, or maintaining cross-system consistency. Covers epics, stories, subtasks, boards, and sprints.

Expert in mapping SpecWeave increments to JIRA structure (Increment → Epic + Stories + Subtasks) with bidirectional sync. Use when exporting increments to JIRA, importing JIRA epics as increments, or configuring field mapping. Maintains traceability across systems.

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.

Check the status of the current Jira work session or a specific issue.

Sync guidance for SpecWeave increments with JIRA epics/stories (content SpecWeave→JIRA, status JIRA→SpecWeave). Use when asking about JIRA integration setup or troubleshooting sync. For actual syncing, use /sw-jira:sync command instead.

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).

This skill should be used when users need to fetch Jira ticket content using either a specific ticket ID (like RD-3891) or search for tickets by title/description. It defaults to searching within the current sprint but can extend to all tickets when needed. The skill uses the Jira CLI to retrieve ticket details, status, assignee, and descriptions.

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

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

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.

Integrate third-party repository history into the monorepo by adding remotes and creating workspaces. Use when testing patches to upstream projects, making local modifications to dependencies, or maintaining forks that need to track upstream changes. (project)

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)

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.

Load Max, the veteran recruiter persona for resume advice, interview prep, and adversarial feedback. Use when discussing resumes, career positioning, or job search strategy.

Use when defining GitLab CI jobs, configuring scripts, setting up environments, or managing job dependencies. Covers job structure and execution options.

Search for jobs at a company OR parse a specific job posting. Extracts requirements, calculates fit scores, and tracks market skills.

Load Scout, the market intelligence analyst for job market research, company evaluation, and opportunity discovery. Use when researching industries, companies, or job postings.

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.

Joker Lint Skill

JOOQ type-safe SQL patterns - use for database queries, repositories, complex SQL operations, and PostgreSQL-specific features

Extract specific fields from JSON files efficiently using jq instead of reading entire files, saving 80-95% context.

JSON processor for filtering, transforming, and manipulating JSON data in command line.

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

Use early returns to avoid unnecessary computation in loops and functions. Apply when processing arrays, validating input, or checking multiple conditions where the result can be determined before all iterations complete.

Enforce ESLint standards by fixing violations systematically

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

Self-contained command for coverage generation and analysis

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.

Generate production-realistic JSON API mock response files for development, testing, and prototyping.

JSON-driven content architecture for services, programmes, FAQs, testimonials, and policies with TypeScript interfaces and locale-aware data fetching. Use when defining content schemas, creating data utilities, adding new content types, or fetching localized business data.

Parse and validate JSON data with schema support

Generate realistic fake data from JSON schemas, producing 1-50 valid records that conform exactly to the schema. Use when creating sample datasets from schema definitions, populating test databases, or generating example API responses. Returns only valid JSON that passes schema validation.

Validate JSON data against JSON Schema specifications. Use for API validation, config file validation, or data quality checks.

Use when working with JSON Schema for validation, OpenAPI schemas, type definitions, and data structure specification

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Jobs to Be Done (JTBD) framework by Clayton Christensen. Analyzes requirements through the lens of what 'job' customers hire products to do. Covers functional, emotional, and social jobs. Use when understanding underlying customer motivations or reframing features as outcomes.

Expert guidance for Julia package development following SciML standards, Distributions.jl patterns, and Julia ecosystem best practices

Guide for creating Claude Code hooks - shell commands that execute at specific lifecycle events (SessionStart, SessionEnd, PreToolUse, PostToolUse, etc.). Use when users want to automate actions, add validation, logging, or integrate external tools into Claude Code workflows.

Guide d'installation Astro + Tailwind sur Windows. Covers Node.js setup, pnpm, project creation, common Windows issues, and troubleshooting.

Get OpenAI Codex CLI's opinion on code, bugs, or implementation. Use when you want a second AI perspective during coding sessions.