90% of the people are misusing Claude Code: Anthropic Official Best Practices for a complete analysis.

Claude Code is an Agentic programming tool launched by Anthropic that can read the code library, edit files, run commands and integrate them in depth with your development tool. But according to official documents,90% of people are using it wrongly.I don't know.

This paper is based on the Anthropic official best practice and brings you to the correct use of Claude Code.

Core constraints: context window

Most best practices are based on a core constraint:Claude's context window is filled very quickly, and performance decreases with filling.

Claude's context window contains the entire history of your conversation, the files that Claude reads, and the output of each command. When the context window is close to full, Claude may start to "remember" pre-commands or make more mistakes.

The context window is the most important resource and requires continuous management.

Best practice one: give Claude a way to validate the work

That is the most important point.

When Claude is able to verify her work — for example, running tests, contrast screenshots, validation output — her performance will increase significantly.

Policy	Error Example	Correct Example
Provision of certification standards	"Current function to verify an email address"	"Write a ValidateEmail function. Example for testing: user@example.com returns true, invalid returns false, user@.com returns false. Finish Run Test
Verify UI Changes	"Let the dashboard look better."	"Achieving this design. Comparison of post-completion maps, showing discrepancies and repairing”
Addressing root causes	"Construction failed"	"Build to report the error: xx. Fix it and verify the construction success, address the root causes rather than suppress the error.”

Use correctly

# ❌ 错误：模糊的指令
claude "写个登录功能"

# ✅ 正确：具体的需求 + 验证方式
claude "实现 Google OAuth 登录。先了解现有 auth 流程，写出详细计划，然后实现。完成后运行测试确保通过"

Best practice II: Explore, plan, final code

Allow Claude to jump directly to the code may create a code to solve the problem. Use Plan Mode To separate exploration and execution.

Recommended workflow

1. Explore (Plan Mode)Claude read only files and answer questions without modification
2. Plan Mode: Let Claude create detailed realization plans
3. Normal ModeToggle back to normal mode to make Claude encode and verify
4. Submit: Let Claude submit and create PR

# 探索阶段
claude 
阅读 /src/auth 目录，了解我们如何处理会话和登录

# 计划阶段
我想添加 Google OAuth。需要改哪些文件？会话流程是什么？创建一个计划

# 实现阶段
implement the OAuth flow from your plan. write tests for the callback handler

When don't you need a plan?

When the range of tasks is clear and smaller (e.g. repairing spelling errors, adding log lines) it is sufficient for Claude to do it directly.

Best practice III: Provide specific context in the reminder

Claude can extrapolate intent, but can't read minds. Reference to specific documents, reference to binding conditions, pointing to illustrative models.

Policy	Error Example	Correct Example
Limit	Add test to foo.py	"Foo.py writes tests to cover the boundaries that the user has posted. Do not mock"
Point to source	"Why is it so weird about SituationFactory API?"	"Look at the history of ExchangeFactory and summarize how its API evolved."
Reference to existing models	Add a Calendar Component	“Model of realization of existing components on the first page of the reference. HotDogWidget.php is a good example. Create a new calendar component according to this mode."
Describe symptoms	"Recover login bug"	"User report session login after timeout failed. Checks auth process in src/ auth/, especially token refreshs. Write a failed test for recurrence problems and fix it."

Use @reference files

# ❌ 错误：描述文件位置
claude "看看 src/utils 里的那个 helpers.py 文件"

# ✅ 正确：直接 @ 引用
claude "@helpers.py 这个文件有什么可以改进的？"

Best practice IV: Configure your environment

Write a valid CLAUDE.md

CLUDE.md is a special document that Claude reads at the beginning of each conversation. Contains Bash commands, code styles and workflow rules.

# CLAUDE.md 示例

## 项目结构
- 前端使用 React + TypeScript
- 后端使用 Node.js + Express

## 代码规范
- 使用 ESLint + Prettier
- 组件使用函数式组件和 hooks
- 避免使用 class 组件

## 常用命令
- `npm run dev` 启动开发服务器
- `npm test` 运行测试
- `npm run build` 构建生产版本

Run /init Command can generate a starter CLAUDE.md file based on the current project structure.

Best practice five: using MCP to expand capacity

Model Context Protocol (MCP) is an open standard for connecting AI tools to external data sources. Through MCP, Claude Code can:

• Read design documents in Google Drive
• Update worksheets in Jira
• Draw data from Slack
• Use your custom tool

# 配置 MCP 服务器后，你可以：
claude "从 Jira 拉取最新的 bug 列表"
claude "更新设计文档"

Best Practice VI: Use SubAgent Parallel Work

Claude Code supports the task of generating multiple sub-Agents while dealing with different parts. Main Agent coordinates, assigns sub-tasks and consolidates results.

# 让多个 Agent 同时工作
claude "同时处理这三个任务：1) 优化数据库查询 2) 添加单元测试 3) 更新 API 文档"

Summary

Claude Code is an Agency programming environment that changes the way you work. Don't write the code and let Claude review it, but describe what you want, Claude will figure out how to build it.

Remember three core principles:

1. Give Claude the authentication method - Test, screenshot, expected output
2. Explore and encode. – Use Plan Mode
3. Specific context - The more precise the better.

With these best practices, you can use Claude Code's greatest power.

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