Testing & Debugging for Claude Code

Expert agent for integrating Apify Actors into codebases. Handles Actor selection, workflow design, implementation across JavaScript/TypeScript and Python, testing, and production-ready deployment. Use proactively whenever the user wants to scrape a website, automate a browser task, or wire an Apify Actor into their app.

Instrument a webapp to send useful telemetry data to Azure App Insights

Comprehensive backend development guide for Node.js/Express/TypeScript microservices. Use when creating routes, controllers, services, repositories, middleware, or working with Express APIs, Prisma database access, Sentry error tracking, Zod validation, unifiedConfig, dependency injection, or async patterns. Covers layered architecture (routes → controllers → services → repositories), BaseController pattern, error handling, performance monitoring, testing strategies, and migration from legacy pa

Implement blue-green deployment strategy with zero-downtime switching, health validation, and automatic rollback

Executes structured workflows (Debug, Express, Main, Loop) with strict correctness and maintainability. Enforces an improved tool usage policy, never assumes facts, prioritizes reproducible solutions, self-correction, and edge-case handling.

Executes structured workflows with strict correctness and maintainability. Enforces a minimal tool usage policy, never assumes facts, prioritizes reproducible solutions, self-correction, and edge-case handling.

This skill should be used when the user asks to "test for broken authentication vulnerabilities", "assess session management security", "perform credential stuffing tests", "evaluate password policies", "test for session fixation", or "identify authentication bypass flaws". It provides comprehensive techniques for identifying authentication and session management weaknesses in web applications.

Browser automation powers web testing, scraping, and AI agent interactions. The difference between a flaky script and a reliable system comes down to understanding selectors, waiting strategies, and anti-detection patterns. This skill covers Playwright (recommended) and Puppeteer, with patterns for testing, scraping, and agentic browser control. Key insight: Playwright won the framework war. Unless you need Puppeteer's stealth ecosystem or are Chrome-only, Playwright is the better choice in 202

Modern JavaScript/TypeScript development with Bun runtime. Covers package management, bundling, testing, and migration from Node.js. Use when working with Bun, optimizing JS/TS development speed, or migrating from Node.js to Bun.

This skill should be used when the user asks to "intercept HTTP traffic", "modify web requests", "use Burp Suite for testing", "perform web vulnerability scanning", "test with Burp Repeater", "analyze HTTP history", or "configure proxy for web testing". It provides comprehensive guidance for using Burp Suite's core features for web application security testing.

Write efficient C code with proper memory management, pointer

Write efficient C code with proper memory management, pointer arithmetic, and system calls. Handles embedded systems, kernel modules, and performance-critical code. Use PROACTIVELY for C optimization, memory issues, or system programming.

Demonstrate changelog automation features with real examples and validation

Use this agent when you need to design and execute controlled failure experiments, validate system resilience before incidents occur, or conduct game day exercises to test your team's incident response capabilities. Specifically:\\n\\n<example>\\nContext: A microservices platform has recently experienced two unexpected service failures that took 2 hours to recover from. Leadership wants confidence that the system won't fail again without warning.\\nuser: \"We need to test if our system can handl

Setup comprehensive CI/CD pipeline with automated testing, building, and deployment

Master guide for using Claude Code effectively. Includes configuration templates, prompting strategies "Thinking" keywords, debugging techniques, and best practices for interacting with the agent.

Query ClinicalTrials.gov via API v2. Search trials by condition, drug, location, status, or phase. Retrieve trial details by NCT ID, export data, for clinical research and patient matching.

Code Permutation Tester

Comprehensive code review skill for TypeScript, JavaScript, Python, Swift, Kotlin, Go. Includes automated code analysis, best practice checking, security scanning, and review checklist generation. Use when reviewing pull requests, providing code feedback, identifying issues, or ensuring code quality standards.

This skill should be used when the user asks to "test for XSS vulnerabilities", "perform cross-site scripting attacks", "identify HTML injection flaws", "exploit client-side injection vulnerabilities", "steal cookies via XSS", or "bypass content security policies". It provides comprehensive techniques for detecting, exploiting, and understanding XSS and HTML injection attack vectors in web applications.

Use this agent when building ASP.NET Core web APIs, cloud-native .NET solutions, or modern C# applications requiring async patterns, dependency injection, Entity Framework optimization, and clean architecture. Specifically:\\n\\n<example>\\nContext: Building a production ASP.NET Core REST API with database integration, authentication, and comprehensive testing.\\nuser: \"I need to create an ASP.NET Core 8 API with EF Core, JWT authentication, Swagger documentation, and 85%+ test coverage. Should

Expert assistant for developing Model Context Protocol (MCP) servers in C#

Write modern C# code with advanced features like records, pattern matching, and async/await. Optimizes .NET applications, implements enterprise patterns, and ensures comprehensive testing.

An agent designed to assist with software development tasks for .NET projects.

Datadog CLI for searching logs, querying metrics, tracing requests, and managing dashboards. Use this when debugging production issues or working with Datadog observability.

Debug your application to find and fix a bug

Systematically Debug and Fix Errors

Debugging specialist for errors, test failures, and unexpected behavior. Use proactively when encountering any issues. '

Use this agent when you need to diagnose and fix bugs, identify root causes of failures, or analyze error logs and stack traces to resolve issues. Specifically:\n\n<example>\nContext: Application is crashing intermittently with a null pointer exception in production.\nuser: \"Our payment service keeps crashing with NullPointerException in the transaction handler. We have crash logs but can't reproduce it locally. Can you debug this?\"\nassistant: \"I'll use the debugger agent to analyze your cra

Expert guidance for distributed training with DeepSpeed - ZeRO optimization stages, pipeline parallelism, FP16/BF16/FP8, 1-bit Adam, sparse attention

NGS analysis toolkit. BAM to bigWig conversion, QC (correlation, PCA, fingerprints), heatmaps/profiles (TSS, peaks), for ChIP-seq, RNA-seq, ATAC-seq visualization.

Comprehensive deployment monitoring with observability, alerting, health checks, and performance tracking

Use when Codex is building or iterating on a web game (HTML/JS) and needs a reliable development + testing loop: implement small changes, run a Playwright-based test script with short input bursts and intentional pauses, inspect screenshots/text, and review console errors with render_game_to_text.

Use when actively responding to production incidents, diagnosing critical service failures, or conducting incident postmortems to implement permanent fixes and preventative measures. Specifically:\\n\\n<example>\\nContext: A critical database service has gone down, causing customer-facing API timeouts. The on-call engineer needs immediate help triaging impact and determining next steps.\\nuser: \"We're getting spiked error rates on our API - database connection timeouts appearing 2 minutes ago.

Production troubleshooting and incident response specialist. Use PROACTIVELY for debugging issues, log analysis, deployment failures, monitoring setup, and root cause analysis.

Expert agent for creating unit tests for java applications using Diffblue Cover.

Create calibrated digital twins with real-world validation, scenario testing, and decision optimization

Use when building Django 4+ web applications, REST APIs, or modernizing existing Django projects with async views and enterprise patterns. Specifically:\\n\\n<example>\\nContext: Team needs to build a production-ready REST API with JWT authentication, role-based permissions, and async handlers for high-traffic endpoints\\nuser: \"We're building a real-time notification system using Django REST Framework with WebSockets. Need to handle 10k+ concurrent users with proper authentication and rate lim