개발 스킬

Build MCP servers that let LLMs work with external APIs and services. The guide covers workflow-focused tool design, implementation in Python with FastMCP or Node/TypeScript with the MCP SDK, error handling, review, and evaluations using realistic questions.

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• Design tools for a service integration workflow
• Implement an MCP server in Python or TypeScript
• Plan validation, pagination, and error handling

Turn recurring agent mistakes or behavior gaps into focused `.claude/rules` files. The guidance uses incorrect and correct examples to make expectations clear, and helps distinguish always-on rules from task-specific skills or broad project notes.

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• Documenting a mistake an agent keeps repeating
• Adding a project-wide behavior constraint
• Scoping guidance to particular file paths

Applies an incremental approach to coding, refactoring, system design, and workflow changes. It encourages error prevention through types and early validation, consistency with existing project patterns, and solutions sized to current needs instead of speculative complexity.

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• Making a small, focused improvement during implementation
• Designing validation and error handling to catch problems early
• Refactoring while keeping existing project conventions

Create or update agent skills by testing how agents handle realistic scenarios before writing instructions. The guide adapts the RED-GREEN-REFACTOR cycle from test-driven development: observe failures, write targeted guidance, and test again to close gaps.

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• Drafting a new agent skill
• Updating existing skill instructions
• Checking whether a skill works in practice

Use Git notes to attach review status, test results, audit details, or other metadata to commits without changing their hashes or rewriting history. This skill covers adding, viewing, organizing, sharing, merging, and preserving notes across rebases.

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• Recording code review status on commits
• Adding test results to specific commits
• Sharing notes with a Git remote

Review an open GitHub pull request and post concise, actionable comments directly on changed lines. The workflow checks eligibility, considers code quality and relevant risks, and filters findings by confidence and impact before commenting.

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• Reviewing changes in an open GitHub pull request
• Focusing a review on security or performance
• Posting actionable feedback on specific changed lines

Work on several Git branches in separate directories using Git worktrees. The skill covers creating and cleaning up worktrees, reviewing pull requests without interrupting current work, running isolated tests, and comparing or selectively combining changes.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Reviewing a pull request while feature work continues
• Testing changes in an isolated directory
• Comparing implementations across branches

Structure an improvement effort as a measurable PDCA cycle: define the problem and a hypothesis, make a small change, compare results with a baseline, then standardize what worked or adjust the next experiment.

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• Reducing build times through measurable experiments
• Lowering production bugs with staged improvements
• Finding the cause of slow code reviews and adjusting the process

Breaks a task specification into implementation phases, delegates each step, and checks the completed work with an automated LLM review before moving on. It can also continue or refine work already in progress.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Implementing a task from a written specification
• Continuing unfinished work from the last completed step
• Rechecking changes made during an incremental refinement

Review only unresolved pull request threads and check each comment against the current files, including uncommitted local changes. Resolve threads only when every requirement is met or the concern is obsolete, and report which threads remain open with reasons.

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• Checking whether requested code changes satisfy review comments
• Resolving review threads after fixes are present locally
• Leaving partially addressed feedback open

Add review feedback directly to specific changed lines in a GitHub pull request. The skill explains how to post one comment or group several comments into a review, using an available inline-comment tool or GitHub CLI (`gh`).

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• Comment on a specific changed line
• Group several code comments into one review
• Choose the correct diff line and side

Create a GitHub pull request with GitHub CLI using the project’s required title format and pull request template. Check for uncommitted changes first, create the request as a draft when work is in progress, and use English for its title and description.

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• Creating a draft pull request from committed work
• Preparing a PR description that follows the project template
• Checking PR status or marking a draft ready for review

Delegate a task to an implementation agent, have a separate agent set tailored evaluation criteria and judge the result, then retry with specific feedback when needed. The process allows up to three retries before escalating unresolved issues.

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• Implementing a feature with independent quality checks
• Refactoring code with feedback driven revisions
• Completing a task that needs a defined evaluation rubric

Compare recent Git changes with the project’s FPF knowledge base to find context drift, evidence tied to changed files, and decisions that may need review. The skill reports findings and updates the baseline commit for the next audit.

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• Checking the knowledge base before starting new work
• Finding evidence affected by recent code changes
• Reviewing project decisions after configuration changes

Create and manage a linear chain of related branches and pull requests with gh-stack. Use it to split multi-part changes into reviewable layers, then inspect, update, sync, rebase, submit, or merge the stack.

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• Splitting a multi-part change into reviewable pull requests
• Checking the branches and pull requests in a stack
• Syncing or rebasing dependent branches

Configure Next.js 16 Cache Components to combine prerendered, cached, and request-time content in one route. Set cache lifetimes and tags, invalidate data, and migrate older caching patterns while accounting for runtime and deployment limits.

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• Mixing static, cached, and fresh request-time content on a page
• Setting cache lifetimes and invalidation rules
• Migrating from unstable_cache or older PPR settings

Refactor React components into reusable pieces with clearer interfaces. Provides patterns for replacing excessive boolean settings, sharing state through providers, and designing component libraries, with additional guidance for React 19 APIs.

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• Refactor components with too many boolean settings
• Design a reusable component library
• Review shared state and provider structure

Build and improve mobile apps with React Native and Expo using prioritized implementation rules. Covers faster lists, animations, images, navigation, state management, and native dependencies, with explanations and code examples for reviewing common implementation choices.

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• Improving long lists and scrolling performance
• Reviewing Reanimated animations and gestures
• Choosing image, navigation, and modal implementations

Review web interface code against the latest Web Interface Guidelines to identify issues in design, usability, and accessibility. Specify files or a file pattern, and receive concise findings with file names and line numbers.

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• Review the code behind a web interface
• Check accessibility against the guidelines
• Request a design or usability review

Use these React and Next.js guidelines when building, reviewing, or refactoring application code. The rules cover data loading, bundle size, server and client performance, rendering, and re-renders, with examples of inefficient and improved patterns.

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• Building a React component or Next.js page
• Reviewing code for performance issues
• Reducing bundle size or load time

Apply practical Next.js guidance when writing or reviewing application code. It covers project files, Server and Client Component boundaries, data patterns, async APIs, routing, error handling, metadata, image and font optimization, and bundling.

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• Reviewing a Next.js project structure
• Checking Server and Client Component boundaries
• Improving data fetching and route handlers

Upgrade a project to the latest Next.js version by checking its current dependencies, following official migration guides, and applying codemods for code changes. The workflow also identifies manual updates and calls for build and development checks.

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• Upgrading a project to a newer Next.js version
• Planning steps for a major version jump
• Applying codemods for breaking changes

Uses a live Unreal Editor connection through MCP to inspect and modify project state, such as actors, Blueprints, materials, and assets. It discovers the available tools before acting and checks results, making it suited to hands-on editor tasks rather than conceptual questions.

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• Moving or duplicating actors in a level
• Creating or editing a Blueprint or material
• Reading or changing actor properties

Create, update, and review reusable instruction bundles for Unreal Engine agents. Get guidance on choosing a Python class or project asset, writing the description and instructions, registering the skill, and checking how it will appear to the agent.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Creating an Unreal Engine Agent Skill for a workflow
• Updating or reviewing a skill’s instructions
• Choosing between a Python class and a UAsset