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Claude Code Best Practices: How to Work Effectively with AI

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Essential best practices for Claude Code. Be specific, break tasks down, use memory, review before committing, and build effective workflows.

Claude Code Best Practices: Memory Management & Context Optimization

Claude Code is genuinely powerful. Most developers use maybe 30% of what it can do. The gap isn't capability — it's workflow. The developers who get the most out of Claude Code have built specific habits and setups that compound over time. This guide covers what those are.

1. Solve the Memory Problem First​

Everything else in this guide is more effective once you've solved context persistence. Claude Code starts every session with zero knowledge of your project. If you're re-explaining your stack and architecture every morning, you're burning time before you've done any real work. The minimum viable fix: CLAUDE.md Create a CLAUDE.md file in your project root. Claude reads it automatically at session start.

ProjectName

Stack​

  • Next.js 14, TypeScript, PostgreSQL 16
  • Deployed on Railway; staging at staging.example.com

Architecture​

  • Repository pattern for all DB access (no raw queries in routes)
  • JWT auth, tokens stored in httpOnly cookies
  • API routes in /app/api, business logic in /lib

Current focus​

  • Migrating from Pages Router to App Router (in progress)
  • Do not create new Pages Router files

Known gotchas​

  • Stripe webhook fires twice occasionally — always check idempotency key
  • Redis connection pool limit: 10 connections max in dev The robust fix: MemClaw via MCP For projects longer than a few weeks, or multiple projects, set up MemClaw. It gives Claude semantic search over your project history, stores conversation logs, and works across multiple projects without per-repo files. { "mcpServers": { "memclaw": { "command": "npx", "args": ["-y", "@memclaw/mcp-server"], "env": { "MEMCLAW_API_KEY": "your_key", "MEMCLAW_WORKSPACE_ID": "your_workspace_id" } } } } The 15-minute setup pays back within the first week.

2. Give Claude the Right Scope​

Two failure modes: Too little context: Claude makes suggestions that contradict your architecture, recommends libraries you've already ruled out, or misses constraints you've already discovered. Too much context: Claude gets confused by irrelevant files, takes longer to respond, and loses track of the actual task. The right scope: files directly relevant to the current task, plus your project context (CLAUDE.md or MemClaw workspace). Start sessions with a clear task statement before Claude starts exploring: "I'm working on the auth refactor — specifically extracting JWT validation from the middleware into a dedicated service. Here's the current middleware."

3. Use Slash Commands for Repeated Workflows​

If you find yourself typing the same instructions at the start of sessions, turn them into a slash command.

.claude/commands/start-session.md

Load the project context from the MemClaw workspace. Summarize: current sprint goal, any open blockers, and what we worked on last session. Then ask me what I want to work on today.

.claude/commands/end-session.md

Summarize what we accomplished in this session. List any decisions made and why. Add these to the MemClaw workspace. Suggest what to tackle next. Run /start-session and /end-session as bookends to every working session.

4. Be Explicit About What You Don't Want​

Claude is helpful to a fault. It will refactor code you didn't ask it to refactor, add error handling you didn't request, and "improve" things that were fine. Be explicit: "Fix the bug in the validateUser function. Don't change anything else in the file. Don't add comments. Don't refactor surrounding code." "Add the new endpoint. Follow the exact same pattern as the existing endpoints — don't introduce new patterns or abstractions." This sounds pedantic, but it saves significant back-and-forth.

5. Review Before You Accept​

Always review the diff before accepting changes. The most common issues:

  • Changes to files you didn't intend to modify
  • Removal of code that looked unused but wasn't
  • Introduction of new dependencies without asking
  • Style changes mixed in with functional changes For anything beyond trivial edits, review in your editor before committing.

6. Use Claude for Architecture Discussions, Not Just Implementation​

Most developers use Claude Code as a code generator. The better use is as a thinking partner. Before writing code: "I need to add rate limiting to the API. Here's the current architecture. What are the trade-offs between implementing this at the middleware level vs. per-route? What are the failure modes I should think about?" Claude's reasoning about trade-offs is often more valuable than its code generation. Use it to think through problems before committing to an approach.

7. Maintain a Decision Log​

Every significant architectural decision should be recorded somewhere Claude can access. Not just what you decided, but why. Format that works well:

2026-03-15: Auth approach​

Decision: JWT over sessions Reason: Sessions required sticky routing in our Railway deployment, which complicated horizontal scaling. JWT is stateless. Rejected: Sessions (scaling), OAuth-only (too complex for MVP) Store these in your MemClaw workspace or in a decisions.md file. When you ask Claude "why did we choose JWT?" six months from now, it can give you the actual reasoning.

8. Scope Your Workspaces Appropriately​

If you're using MemClaw, resist the temptation to put everything in one workspace. A workspace that contains your entire company's knowledge is too noisy — retrieval quality degrades as the workspace grows beyond what's relevant to any single task. Good workspace scoping:

  • One workspace per project or service
  • Separate workspaces for separate concerns (frontend / backend for a large monorepo)
  • A shared workspace for cross-cutting concerns (team conventions, shared infrastructure) 📷 Screenshot: A2 (en-memclaw-workspace-list.png) Purpose: 展示多工作区列表，说明项目隔离 Treatment: 裁剪左侧面板，加数字标注 1/2/3 指向不同项目

9. Test Claude's Understanding Before Long Tasks​

Before asking Claude to do something complex and multi-step, verify it understands the task correctly. "Before you start: summarize what you're going to do and why. Don't write any code yet." This surfaces misunderstandings before they become wasted work. If Claude's summary doesn't match your intent, correct it before it starts making changes.

10. Build the End-of-Session Habit​

The single highest-leverage habit: spend two minutes at the end of every session updating your context. "Before we finish: what were the key decisions from this session? Add them to the workspace with today's date." This compounds. After a month, you have a searchable record of every decision. After six months, Claude can answer questions about your project history that you've forgotten yourself. The developers who get the most out of Claude Code aren't the ones who use the most advanced features. They're the ones who've built consistent habits around context management. Set up persistent memory with MemClaw → memclaw.me