Configure Claude Code project memory by creating a CLAUDE.md file in your project root that persists across sessions and documents coding conventions, project-specific configurations, and architectural decisions. Claude Code automatically reads this file and applies stored context about your tech stack, naming patterns, testing requirements, and architectural approaches—enabling consistent AI assistance across all team members.

Understanding Claude Code Project Memory

Claude Code project memory works through several mechanisms that persist context between sessions. The primary tool is the CLAUDE.md file, a markdown document in your project root that Claude Code automatically reads and references. Unlike chat history that disappears after each session, project memory files remain available across all future interactions.

Project memory serves three main purposes. First, it stores coding conventions your team follows, such as naming patterns, file organization rules, and testing requirements. Second, it documents project-specific configurations, including build processes, dependency management, and deployment procedures. Third, it captures architectural decisions and rationale that new team members or future sessions need to understand.

Creating Your CLAUDE.md File

The CLAUDE.md file resides in your project root directory. Claude Code checks for this file automatically when starting a session in any subdirectory of your project. The file uses markdown syntax and can include any information helpful for understanding your codebase.

A basic project memory file starts with project context:

# Project Context

This is a React TypeScript application using Next.js 14.
The project follows our team's coding standards documented below.

## Tech Stack
- Frontend: React 18, TypeScript 5, Next.js 14
- State: Redux Toolkit with RTK Query
- Testing: Jest, React Testing Library
- Styling: Tailwind CSS with custom design tokens

Add coding conventions that should persist across all sessions:

## Coding Conventions

### Naming
- Components: PascalCase (UserProfile, OrderList)
- Hooks: camelCase with "use" prefix (useUserData, useCartItems)
- Utilities: camelCase (formatCurrency, calculateTotal)
- Constants: SCREAMING_SNAKE_CASE (MAX_RETRY_COUNT, API_BASE_URL)

### File Organization
- Components go in /components with index exports
- API calls in /services directory
- Custom hooks in /hooks directory
- Types in /types directory

### Testing Requirements
- Every component needs corresponding .test.tsx file
- Use @testing-library/react for component tests
- Minimum 80% coverage for business logic

Configuring Multiple Memory Files

For larger projects, create specialized memory files that Claude Code can reference explicitly. Use the @filename syntax in your prompts to load specific documentation:

<!-- In /docs/api-standards.md -->
# API Standards

All REST endpoints follow these patterns:
- GET /resources - List all resources
- GET /resources/:id - Get single resource
- POST /resources - Create new resource
- PUT /resources/:id - Update resource
- DELETE /resources/:id - Delete resource

Response format:
{
  "data": {},
  "meta": { "page": 1, "total": 100 }
}

Reference these files in your prompts:

@docs/api-standards.md Create a new API endpoint for user preferences following our standards

Using Project Memory with Git Integration

Combine project memory with Git hooks to enforce conventions automatically. Create a pre-commit hook that validates code against your standards:

#!/bin/bash
# .git/hooks/pre-commit

# Run linting
npm run lint

# Check TypeScript compilation
npx tsc --noEmit

# Run convention checks
node scripts/check-naming-conventions.js

Reference these checks in your CLAUDE.md:

## Git Workflow

- All commits must pass pre-commit hooks
- Use conventional commit messages: feat:, fix:, docs:, refactor:
- Create feature branches from develop, merge to main via PR

Team-Wide Project Memory

For organizations with multiple projects, create a shared memory template that teams customize. Store this in a central repository and include in each project:

# Organization Standards

This project follows our company's universal coding standards.

## Security Requirements
- Never log sensitive data (passwords, tokens, PII)
- Use environment variables for all secrets
- Validate and sanitize all user inputs
- Implement proper error handling without exposing internals

## Performance Guidelines
- Lazy load routes in Next.js
- Memoize expensive calculations
- Use pagination for list endpoints
- Optimize images with next/image

Include this in each project with a relative path:

## Organization Standards

See /../org-standards/company-standards.md for universal requirements

Testing Memory Configuration

Ensure your testing conventions persist by documenting them explicitly:

## Testing Conventions

### Unit Tests
- Test file location: same directory as source, filename.test.ts
- Use describe blocks for grouping related tests
- Include happy path and error cases
- Mock external dependencies

### Integration Tests
- Place in /__tests__/integration directory
- Use test database, not production
- Clean up test data after each test
- Use realistic test data from /fixtures

When creating new features, reference these conventions:

Create a new service for handling notifications following our testing conventions

Troubleshooting Project Memory

If Claude Code doesn’t seem to remember your conventions, verify several factors. First, ensure the CLAUDE.md file exists in the project root where you’re running Claude Code. Second, check that the file has proper markdown formatting without syntax errors. Third, confirm you’re in the correct directory when starting the session—Claude Code only checks the current directory and its parents.

For persistent issues, explicitly reference the memory file in your prompt:

Using the conventions in CLAUDE.md, create a new component

Advanced: Dynamic Project Memory

For projects with multiple environments or configurations, create conditional memory sections:

# Development vs Production Conventions

## Development
- Use mock data from /mocks directory
- Enable verbose logging
- Point to localhost API

## Production
- Use real API endpoints
- Minimal logging
- Error boundaries required

Reference the appropriate context when working:

Create a component for production environment

This approach ensures Claude Code maintains context awareness across different project contexts while keeping your conventions consistent and discoverable.

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