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

improve-codebase-architecture Matt Pocock skill This skill scans a codebase for architectural friction, then builds a visual HTML report with refactoring candidates. Use it before a deeper architecture review. Claude Code 1,163,035installs tdd Matt Pocock skill Guides the red-green TDD loop: ensures tests are written first, keep them at public interfaces, and avoid coupling to implementation details. Claude Code 1,141,062installs triage Matt Pocock skill This skill moves issues and external PRs through triage states, verification, and agent briefs. It fits maintainers managing an issue queue. Claude Code 990,453installs codebase-design Matt Pocock skill This skill helps design modules with small interfaces and hidden complexity. Use it when refactoring code, choosing a seam, or making tests easier to write. Claude Code 850,344installs code-review Matt Pocock skill Reviews changes from a chosen reference point against repository standards and the originating spec. Use it for a branch, PR, or work in progress. Claude Code 789,521installs implement Matt Pocock skill Implements work from a specification or tickets, following a test-driven flow and ending with review and a commit. Use it when a coding task needs a defined delivery routine. Claude Code 774,700installs to-tickets Matt Pocock skill Turns a plan, spec, or conversation into linked tickets with blocking dependencies. Use it when work needs to be handed to agents or published to a tracker. Claude Code 711,230installs migrate-to-shoehorn Matt Pocock skill Replaces as type assertions in tests with helpers from @total-typescript/shoehorn. Use it when tests need partial objects or deliberately invalid data. Claude Code 475,388installs systematic-debugging Jesse Vincent skill Makes the agent investigate the cause of a failure before it suggests a patch. Use it for failing tests, build errors, and behaviour that does not match expectations. Claude Code CX Codex 306,118installs retro Matt Pocock skill Reviews a coding session and suggests changes to the agent environment for later runs. Use it after mistakes, slow repository navigation, or costly tool calls. Claude Code 276,027installs requesting-code-review Jesse Vincent skill Sends completed work to a reviewer subagent after a task, major feature, or before merging to main. It keeps the review focused on the change and its requirements. Claude Code CX Codex 262,135installs test-driven-development Jesse Vincent skill Guides feature work and bug fixes through TDD: write a failing test, then add minimal code. Use it when test-first discipline matters. Claude Code CX Codex 259,292installs verification-before-completion Jesse Vincent skill This skill blocks completion claims until the agent runs a fresh check and reads the result. Use it before commits or PRs when an agent report is not enough. Claude Code CX Codex 251,313installs executing-plans Jesse Vincent skill Runs an implementation plan in the current session instead of assigning each task to a subagent. Use it for inline work with TDD, a decision ledger, and a final branch review. Claude Code CX Codex 242,988installs subagent-driven-development Jesse Vincent skill This skill runs an implementation plan through fresh subagents for independent tasks and reviews each result. Use it for multi-step work in one session. Claude Code CX Codex 237,746installs receiving-code-review Jesse Vincent skill Reviews code review feedback before changes: it clarifies unclear points, checks the repository, and supports reasoned pushback. Use it before acting on review comments. Claude Code CX Codex 221,216installs refactor official github skill This skill reshapes existing code without changing its external behavior. Use it for gradual cleanup of large functions, duplication, weak types, and code smells. GitHub Copilot 22,321installs diagnosing-superpowers Jesse Vincent skill Investigates a failed Superpowers session through its transcripts and builds an evidence-based report. Use it when work repeats, plans are ignored, or a skill fails to fire. Claude Code CX Codex 19,996installs dotnet-best-practices official github skill Guides reviews and edits of selected .NET/C# code with project rules for structure, DI, tests, logging and security. Use it when changing an existing solution. GitHub Copilot 15,752installs sql-optimization official github skill Reviews SQL performance issues, index choices, and slow-query patterns. Use it when tuning queries for MySQL, PostgreSQL, SQL Server, or Oracle. GitHub Copilot 15,701installs microsoft-code-reference official github skill Checks Microsoft APIs and SDK code against official docs, finds working samples, and helps debug Azure and .NET issues. GitHub Copilot 14,251installs sql-code-review official github skill Reviews SQL for security and performance issues, as well as maintainability. Use it when checking queries or a database schema. GitHub Copilot 14,060installs refactor-plan official github skill This skill investigates a codebase and writes a step-by-step multi-file refactor plan before edits begin. Use it when the proposed change needs review first. GitHub Copilot 12,965installs postgresql-code-review official github skill Reviews SQL and database schemas for PostgreSQL-specific issues. Use it before reviewing migrations, JSONB queries, functions, or access rules. GitHub Copilot 12,608installs create-implementation-plan official github skill This skill creates a Markdown implementation plan for features, refactoring, package upgrades, or infrastructure work. Use it when an agent needs an explicit task breakdown. GitHub Copilot 12,558installs architecture-blueprint-generator official github skill Analyzes a codebase and creates an architecture blueprint with components, dependencies, and diagrams. Use it before extending a project or onboarding developers. GitHub Copilot 12,196installs java-junit official github skill Writes, reviews and fixes Java tests with JUnit, AssertJ and Mockito. Use it when adding, refactoring or debugging tests in Maven and Gradle projects. GitHub Copilot 11,632installs dotnet-design-pattern-review official github skill Reviews selected C#/.NET code for design patterns and suggests improvements without editing files. Use it when you need an architecture-focused code review. GitHub Copilot 11,609installs apple-appstore-reviewer official github skill Reviews an iOS project from an Apple App Store reviewer’s perspective and ranks rejection risks. Use it before submitting an app for review. GitHub Copilot 11,295installs update-implementation-plan official github skill Updates an existing implementation plan for new requirements, refactoring, package upgrades, or architecture changes. Use it when a plan needs actionable tasks and checks. GitHub Copilot 11,107installs review-and-refactor official github skill Reviews project code against local instructions and refactors parts that need changes. Use it before review or when cleaning up an existing codebase. GitHub Copilot 11,056installs csharp-async official github skill This skill guides Copilot through C# async best practices and flags common mistakes. Use it when reviewing async methods, tasks, and public APIs. GitHub Copilot 10,883installs refactor-method-complexity-reduce official github skill Refactors a chosen method by moving complex logic into helpers. Use it when nested conditions or branching make a method hard to follow. GitHub Copilot 9,992installs context-map official github skill This skill makes the agent map every file, test and dependency tied to a task before it touches code. Handy on a codebase you don't know yet. GitHub Copilot 9,641installs ef-core official github skill This skill guides Entity Framework Core reviews and suggests practices for models, queries, migrations, security, and tests. Use it when EF Core code needs a focused check. GitHub Copilot 9,594installs write-coding-standards-from-file official github skill This skill derives project coding standards from existing files or folders. Use it when the repository needs a style guide based on code already in place. GitHub Copilot 9,570installs folder-structure-blueprint-generator official github skill This skill analyzes a project’s folders and creates a blueprint with tree views, naming rules, and file templates. Use it when a codebase needs a clear structure guide. GitHub Copilot 9,438installs java-refactoring-extract-method official github skill This skill guides Extract Method refactoring for complex Java methods while preserving behaviour. Use it when a method needs smaller, focused units backed by tests. GitHub Copilot 9,284installs quasi-coder official github skill This skill turns shorthand, quasi-code, and natural-language requests into working implementations. Use it when requirements are incomplete, imprecise, or mix technical terms. GitHub Copilot 9,100installs power-bi-dax-optimization official github skill Reviews DAX formulas, proposes a revised version, and explains the changes. Use it when Power BI measures are hard to read or slow under filters. GitHub Copilot 9,100installs