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Cover image for Auto Path Header: context for the developer and AI directly in the file
Niklis
Niklis

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Auto Path Header: context for the developer and AI directly in the file

#vscode #productivity #ai #tooling

Have you ever opened a file with code and thought: "Where is this file located?" Or copied code for an AI assistant, and it started giving advice about utils.js, not understanding that it is src/features/auth/utils.js, and not src/shared/utils.js?

I encountered this problem constantly. Especially when a project grows to a bunch of files, when you work with several similar files at the same time, or when you try to explain the context of a task to an AI assistant.

That is why I created Auto Path Header — an extension for VSCode that automatically adds the path to the file directly at the beginning of each file.
Yes, there are similar ones, but in each of them something did not suit me, so I made my own.

Demo

Problem: loss of context

Imagine a typical scenario. You have 15 tabs open. Three files are called index.ts. Two are utils.js. You switch between them, and each time you have to look at breadcrumbs at the top of the screen or hover over the tab to understand where you are.

Worse than that — you copy code into ChatGPT or Claude to ask for help with refactoring. The AI sees:

export function validateUser(user) {
  // ...
}
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And starts giving general advice, not understanding that this is a file from the authentication module, which should work with specific types and dependencies of your project.

Solution: path directly in the file

Auto Path Header adds a comment with the full path to the file at the very beginning:

// src/features/auth/validators/user.validator.js

export function validateUser(user) {
  // ...
}
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Simple? Yes. Effective? Yes.

How it works in practice

Scenario 1: Navigation in a large project

You are working on a microservice architecture. You have:

  • services/user/api/routes/index.ts
  • services/order/api/routes/index.ts
  • services/payment/api/routes/index.ts

You open a file — you immediately see where you are. There is no need to look at breadcrumbs or tabs. The information is right in front of your eyes.

Scenario 2: Code Review with AI

You copy code for review:

// backend/src/modules/payments/services/stripe.service.ts

import { Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';

@Injectable()
export class StripeService {
  constructor(private config: ConfigService) {}

  async createPayment(amount: number) {
    // implementation
  }
}
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The AI immediately understands:

  • This is backend, not frontend
  • This is the payments module
  • This is a service for working with Stripe
  • NestJS is used

The context is complete. The advice is accurate. No "which file is this?" or "is this for client or server?".

Scenario 3: Working with similar files

You have several configs in your project:

  • config/database.config.ts
  • config/redis.config.ts
  • config/auth.config.ts
  • tests/config/database.config.ts

Without paths in files — constant confusion. With Auto Path Header — everything is in its place.

Modern development increasingly uses AI assistants. But when you copy code into an external LLM (ChatGPT, Claude), it loses the project context.

Internal assistants like Cursor solve this problem, but external ones do not.

Important: Cursor and Copilot Chat see the project tree themselves. They do not need the path in the file.

But the extension is useful for you (when reading code) and for external LLMs (ChatGPT, Claude).

What does this mean in practice?

When you paste code into AI:

Without path:

export const config = {
  port: 3000
}
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AI thinks: "Ok, this is some config. I will give general advice".

With path:

// apps/api-gateway/config/server.config.js

export const config = {
  port: 3000
}
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AI understands: "This is an API Gateway config. Port 3000 may conflict with other services. It is necessary to check docker-compose and suggest moving it to environment variables".

The difference is huge.

Extension features

Automatic update

Renamed a folder? Moved a file? The path will update automatically right after renaming.

Support for any languages

The extension knows the comment syntax for most programming languages.

Through customTemplatesByExtension you can set the comment format for any file types:

{
  "autoPathHeader.customTemplatesByExtension": {
    ".anyExt": "anyExt file path: {path|toUpperCase}",
    ".ts": "// 📁 {path}",
    ".tsx": "// ⚛️ {path} → {filename}",
    ".py": "# 🐍 {filename} ({path})",
    ".env": "# 🔐 {path}",
    ".env.local": "# LOCAL OVERRIDE — {path}",
    ".test.ts": "// 🧪 TEST: {path}",
    "Dockerfile.dev": "# DEV BUILD: {absolutePath|unix|toUpperCase}",
    ".txt": "# TEXT FILE: {path}",
    ".log": "// LOG FILE: {path|toLowerCase}"
  }
}
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Filters unix|toLowerCase|toUpperCase are available.

Works in the background

  • the path is automatically added to the beginning of the file
  • when renaming files and folders it updates by itself
  • different comment formats are supported depending on the language
  • you can limit where exactly headers will appear

For existing files you can insert the path manually:

Ctrl+Shift+P → Auto Path Header: Insert Path Comment

📊 Real use cases

Monorepositories

In a monorepo with dozens of packages and shared modules, paths in files become simply necessary. You immediately see in which package the code is located:

// packages/ui-kit/src/components/Button/Button.tsx
// vs
// apps/web-app/src/components/Button/Button.tsx
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Two Button components, completely different context.

Microservices

When you have 5–10 services with a similar structure, paths help not to get confused:

// services/user-service/src/api/controllers/user.controller.js
// services/auth-service/src/api/controllers/user.controller.js
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Learning and onboarding

A new developer opens the project. Each file contains a hint about its location. It is like a built-in map of the project.

Documentation and tutorials

Writing a technical article or tutorial? Code examples with paths immediately give the reader an understanding of the project structure.

🧠 Working with AI assistants

Problem of tokens and context

AI models have a limitation on context size. You cannot feed it the entire project. You have to choose relevant files.

When each file contains a path, the AI:

  • understands the project architecture
  • sees connections between modules
  • can suggest where to create a new file
  • better understands imports and dependencies

Faster code review

You ask the AI to check code for security. With paths it sees:

# backend/src/api/public/handlers/user_data.py
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And understands: "This is a public API endpoint. It is necessary to be especially careful with validation, injections, access rights".

Without path: "This is some handler. I will give general security recommendations".

Generating related code

AI understands the context and can create related files:

I have:
// src/features/orders/models/order.model.ts

Create for it:
// src/features/orders/services/order.service.ts
// src/features/orders/controllers/order.controller.ts
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AI immediately knows where to put files and how to name imports.

⚙️ Configuration

After installation the extension works out of the box.
By default enabled:

{
  "autoPathHeader.updateOnRename": true,
  "autoPathHeader.updateOnRenameRecursive": true
}
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Renamed folder profile to user-profile? The header will update in all 20 files automatically. No more need to manually fix comments that you will send to LLM.

Flexible settings:

{
  "autoPathHeader.allowedOnlyDirectories": [
    "src",
    "**/utils",
    "src/**/*.ts"
  ],
  "autoPathHeader.ignoredDirectories": [
    "temp",
    "**/node_modules",
    "dist/*"
  ]
}
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⚠️ When this is NOT needed

The extension is useful, but not for all cases:

  • Small projects (3–10 files) — the path is obvious even without a comment
  • Public npm packages — the developer path will get into production (if ignore is not configured)
  • Strict linters — some forbid comments at the beginning of a file
  • Files with shebang (#!/usr/bin/env node) — the comment must go after it

🎯 Where else this is useful

Not only for LLM:

  • tickets — you immediately see where the code is located
  • documentation — easier to navigate
  • PR discussions — less confusion

📦 Conclusion

Auto Path Header is a small extension that solves a problem of lost context. It is useful both for the developer (navigation), and for AI (accurate advice), and for the team (onboarding, PR, documentation).

Install, configure for yourself — and forget about the questions "where is this file?".

Links:
AlAuto Path Headert

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