Code review and refactoring: skills, plugins, subagents, slash commands and mcp servers

Gilfoyle Code Review Mode official github subagent Conducts code reviews with the abrasive technical elitism of Silicon Valley's Bertram Gilfoyle. It delivers blunt critiques of architecture and security. GitHub Copilot ★ 40,369repo stars gem-reviewer official github subagent Runs independent reviews of plans, tasks, code, configs, and integrations. Emits strict JSON validation reports for orchestrators without touching source files. GitHub Copilot ★ 40,369repo stars gem-code-simplifier official github subagent A refactoring subagent that removes dead code and drops complexity. Handy when cleaning up messy logic without altering existing behavior. GitHub Copilot ★ 40,369repo stars C++ Expert official github subagent Provides guidance on modern C++ following ISO standards and C++ Core Guidelines. It helps write clean architecture, refactor legacy code, and set up testing. GitHub Copilot ★ 40,369repo stars Delphi Expert official github subagent Assists with Object Pascal development in Delphi projects. It covers VCL, FMX, FireDAC data access, memory safety, and unit registration in project files. GitHub Copilot ★ 40,369repo stars Critical thinking mode instructions official github subagent Forces the engineer to justify technical decisions by repeatedly asking "Why?". It questions assumptions without modifying project files. GitHub Copilot ★ 40,369repo stars Context7-Expert official github subagent This subagent checks library documentation through Context7 and uses current syntax in its answers. Use it for framework and package questions. GitHub Copilot ★ 40,369repo stars Clojure Interactive Programming official github subagent Clojure pair-programming agent enforcing REPL-first workflows before saving files. It prevents silent fallbacks and protects pure functional architecture. GitHub Copilot ★ 40,369repo stars Blueprint Mode official github subagent Executes strict workflows (Debug, Express, Main, Loop) to deliver clean fixes without guesses or conversational fluff. Best for disciplined code changes. GitHub Copilot ★ 40,369repo stars Azure AVM Bicep mode official github subagent Creates, updates, and reviews Azure Bicep IaC using Azure Verified Modules. Helps configure cloud resources according to verified Microsoft practices. GitHub Copilot ★ 40,369repo stars ai-team-dev official github subagent A subagent that carries a task from reading the code to an opened pull request. Useful when you need a feature or a bug fix inside an unfamiliar repo. GitHub Copilot ★ 40,369repo stars ai-readiness-reporter official github subagent Runs an AgentRC readiness assessment and builds a standalone HTML report in reports/index.html. Helps evaluate how prepared a repository is for AI agents. GitHub Copilot ★ 40,369repo stars Universal PR Comment Addresser official github subagent Handles pull request review comments one by one. The subagent applies minimal edits and covers changes with tests. GitHub Copilot ★ 40,369repo stars visual-pr official Awesome Copilot Community plugin Captures UI screenshots with Playwright, annotates elements, and embeds before-and-after views in PR descriptions. Helpful for any layout or frontend change. GitHub Copilot ★ 40,369repo stars security-best-practices official Awesome Copilot Community plugin Audit AI prompts for safety vulnerabilities, bias, and performance inside GitHub Copilot. Helps refine prompts using structured testing methods. GitHub Copilot ★ 40,369repo stars react19-upgrade official Awesome Copilot Community plugin Automates migration from React 18 to React 19 across codebases. Helps remove deprecated APIs and repair broken test suites without tedious manual rewrites. GitHub Copilot ★ 40,369repo stars react18-upgrade official Awesome Copilot Community plugin Guides React 16 and 17 projects through an upgrade to React 18.3.1, covering deprecated APIs, dependencies, class components, and tests. GitHub Copilot ★ 40,369repo stars modernization-workflow official EMEA App GBB plugin Visualizes and guides the GitHub Copilot Modernize CLI workflow for .NET, Java, and C++ repositories across Assess, Plan, and Execute stages. GitHub Copilot ★ 40,369repo stars java-modernization-studio official Ayan Gupta plugin Interactive canvas for GitHub Copilot that guides Java app modernization workflows. It inspects repositories, sets validation gates, and runs migration tasks from real artifacts. GitHub Copilot ★ 40,369repo stars github-security official github plugin Adds an interactive Security canvas to GitHub Copilot App for investigating GHAS code scanning alerts and local security findings. GitHub Copilot ★ 40,369repo stars gesture-review official Aaron Powell plugin The plugin lets you review pull requests through a live camera feed, approving or rejecting changes with thumbs-up or thumbs-down gestures. GitHub Copilot ★ 40,369repo stars gem-team official mubaidr plugin gem-team gives AI coding tasks a workflow with planning, TDD, and verification. Use it when you want to resume larger tasks from a saved plan. GitHub Copilot ★ 40,369repo stars frontend-web-dev official Awesome Copilot Community plugin Adds Playwright MCP testing commands and specialized agents to GitHub Copilot. It helps developers test web interfaces and build React 19.2 components. GitHub Copilot ★ 40,369repo stars database-data-management official Awesome Copilot Community plugin Provides SQL query optimization, security code review, and database administration tools for PostgreSQL and SQL Server in GitHub Copilot. GitHub Copilot ★ 40,369repo stars context-engineering official Awesome Copilot Community plugin This plugin helps GitHub Copilot work with the right project context. Use it to plan multi-file changes and refactors. GitHub Copilot ★ 40,369repo stars cast-imaging official Awesome Copilot Community plugin Adds three specialized agents to GitHub Copilot for architectural mapping, change impact assessment, and code quality analysis using CAST Imaging. GitHub Copilot ★ 40,369repo stars arch official Awesome Copilot Community plugin Generates cited architecture documentation from a local checkout and creates phased modernization plans for legacy projects. GitHub Copilot ★ 40,369repo stars