How to Make Claude Code Respect Module Boundaries

When working on large codebases, Claude Code often pulls context from across your entire project. This behavior works well for small projects but becomes problematic when you need focused analysis within specific module boundaries. Here’s how to control Claude’s scope effectively.

The Module Boundary Problem

Claude Code excels at understanding project-wide relationships, but sometimes you need it to stay within a specific module. For example, when using the tdd skill to write tests for a single service, you don’t want Claude pulling in unrelated code from other modules. Similarly, when the pdf skill generates documentation, it should reference only the relevant component.

The solution involves combining project-specific configuration files with targeted prompts.

Using CLAUDE.md for Module Scoping

Create a CLAUDE.md file in your module’s root directory. This file instructs Claude Code to treat that directory as an isolated context:

cd /your-project/backend-api

Create CLAUDE.md in the module directory:

# Module: backend-api

This directory contains the authentication service.
- API endpoints in `src/routes/`
- Database models in `src/models/`
- Business logic in `src/services/`

IMPORTANT: Do not reference code outside this directory unless explicitly asked.

When you start a session with claude from this directory, Claude reads the local CLAUDE.md and limits its context accordingly.

Project-Wide Boundaries with .claude/settings.json

For more granular control across multiple modules, create a .claude/settings.json in your project root:

{
  "projectBounds": {
    "enabled": true,
    "modules": [
      {
        "name": "frontend",
        "path": "./frontend",
        "description": "React components and state management"
      },
      {
        "name": "backend",
        "path": "./backend",
        "description": "Node.js API and database layer"
      },
      {
        "name": "shared",
        "path": "./shared",
        "description": "Types and utilities used by both"
      }
    ]
  }
}

This configuration helps Claude understand which modules exist and their relationships, enabling more accurate context selection.

Skill-Specific Boundary Techniques

Different skills benefit from different scoping approaches.

For Testing with tdd

When using the tdd skill, explicitly scope your requests:

/tdd Write unit tests for the auth module only. Located at src/auth/

This prevents the skill from analyzing unrelated modules and generates more focused test coverage.

For Documentation with pdf

The pdf skill works similarly. Scope documentation requests:

/pdf Generate API documentation for the payment module at src/payment/

The skill will reference only the specified module’s code.

For Frontend Work with frontend-design

When the frontend-design skill analyzes your UI, specify component boundaries:

/frontend-design Review components in src/components/auth/ only

Using Directory-Specific Prompts

For persistent module awareness, add a prompt file to each module:

/your-project
├── frontend/
│   ├── .claude/
│   │   └── prompt.md      # Frontend-specific instructions
│   └── src/
├── backend/
│   ├── .claude/
│   │   └── prompt.md      # Backend-specific instructions
│   └── src/
└── shared/

The .claude/prompt.md file within each module contains:

You are working in the frontend module. Focus only on:
- React components in src/components/
- State management in src/store/
- Styling in src/styles/

Do not analyze backend code unless the user explicitly requests it.

Claude reads this file when you change into that directory, maintaining module isolation throughout your session.

Context Switching Techniques

When you need to switch modules mid-session, explicitly tell Claude to change scope:

Let's switch to the backend module. Focus on src/services/user.ts

Claude will release the previous context and load only the new module’s files. This works because Claude Code tracks your current working directory and any explicit scope directives.

Best Practices for Module Boundaries

Keep your module structure explicit in documentation. If you use the supermemory skill to store project context, create separate memories for each module:

/supermemory Remember: payment module handles all billing logic in src/payment/
/supermemory Remember: user module manages authentication in src/auth/

This approach creates persistent, scoped references that Claude can access without pulling in unrelated context.

Debugging Boundary Issues

If Claude isn’t respecting boundaries, check three things:

1. Working directory: Confirm you’re in the correct module directory when starting sessions
2. CLAUDE.md existence: Verify the file exists in your current directory
3. Explicit prompts: Include module paths in your requests

When troubleshooting, try starting a fresh session with:

cd /your-project/backend && claude

This forces a clean context load tied to that specific module.

Summary

Making Claude Code respect module boundaries requires a combination of configuration files, explicit prompts, and session management. The key techniques are:

• Place CLAUDE.md files in module directories
• Use .claude/settings.json for project-wide module definitions
• Include explicit module paths in skill invocations
• Create directory-specific prompt files for persistent awareness

These approaches work together to give you precise control over Claude’s context, regardless of whether you’re using xlsx for data processing, canvas-design for UI prototyping, or any other skill in your workflow.

Related Reading

• Claude Skills Context Window Management Best Practices — Context management across module boundaries
• How to Write Effective CLAUDE.md for Your Project — CLAUDE.md is the primary tool for constraining Claude’s scope
• Claude Code Multi-Agent Subagent Communication Guide — Module isolation patterns in multi-agent setups
• Advanced Claude Skills Hub — Advanced patterns for controlling Claude’s behavior

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