{"id":106537,"date":"2026-04-10T17:36:01","date_gmt":"2026-04-10T12:06:01","guid":{"rendered":"https:\/\/www.guvi.in\/blog\/?p=106537"},"modified":"2026-04-10T17:36:04","modified_gmt":"2026-04-10T12:06:04","slug":"using-claude-md-files-customizing-claude-code","status":"publish","type":"post","link":"https:\/\/www.guvi.in\/blog\/using-claude-md-files-customizing-claude-code\/","title":{"rendered":"Using CLAUDE.md files: Customizing Claude Code for your codebase"},"content":{"rendered":"\n<p>Claude Code is a powerful AI tool for developers. But like any tool, it works better when it knows your specific setup. That is where CLAUDE.md files come in.<\/p>\n\n\n\n<p>A CLAUDE.md file is a simple text file you place in your project. It tells Claude Code important things about your codebase: how it is structured, what conventions your team follows, what commands to run, and how you like things done. Think of it like a briefing document you hand to a new developer on their first day. Instead of guessing, they read the briefing and get up to speed fast.<\/p>\n\n\n\n<p>This guide explains what CLAUDE.md files are, why they matter, and exactly how to use them to get better results from Claude Code.<\/p>\n\n\n\n<p><strong>Quick TL;DR Summary<\/strong><\/p>\n\n\n\n<ol>\n<li>This blog covers what CLAUDE.md files are and why Claude Code needs them to work well in your specific project.<br><\/li>\n\n\n\n<li>It explains exactly what information to put in a CLAUDE.md file, from commands and conventions to things Claude Code should never touch.<br><\/li>\n\n\n\n<li>You will learn where to place these files in your project and how Claude Code reads and uses them during a session.<br><\/li>\n\n\n\n<li>The article walks through a practical example and a step-by-step approach to writing your first CLAUDE.md file.<br><\/li>\n\n\n\n<li>It also covers common mistakes to avoid and tips to help your team get consistent results without overcomplicating the setup.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What is CLAUDE.md Files?<\/strong><\/h2>\n\n\n\n<p>An AI coding assistant is only as useful as the context it has. When you open a new session with <a href=\"https:\/\/www.guvi.in\/blog\/what-is-claude-code\/\" target=\"_blank\" rel=\"noreferrer noopener\">Claude Code<\/a> and ask it to help with your project, it has no idea how your team works, what tools you use, or what rules you follow. It makes its best guess. Sometimes that guess is right. Often it is not.<\/p>\n\n\n\n<p>A CLAUDE.md file solves this problem. It is a plain markdown file that Claude Code reads automatically before any task begins. It works like a standing brief that gives Claude Code everything it needs to know about your project upfront, every single time.<\/p>\n\n\n\n<p>You write it once. Claude Code uses it every session. The result is suggestions that actually fit your codebase instead of ones you have to heavily edit before they are useful.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why CLAUDE.md Files Matter for Development Teams<\/strong><\/h2>\n\n\n\n<ul>\n<li>When Claude Code does not know your project, it has to rely entirely on general knowledge and reasonable assumptions.<br><\/li>\n\n\n\n<li>That works for generic tasks but fails when your team has specific conventions, a unique folder structure, or tools that conflict with common defaults.<br><\/li>\n\n\n\n<li>CLAUDE.md files solve three problems at once:<br><\/li>\n<\/ul>\n\n\n\n<div style=\"background-color: #099f4e; border: 3px solid #110053; border-radius: 12px; padding: 18px 22px; color: #FFFFFF; font-size: 18px; font-family: Montserrat, Helvetica, sans-serif; line-height: 1.7; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15); max-width: 750px;\">\n  <strong style=\"font-size: 22px; color: #FFFFFF;\">\ud83d\udca1 Did You Know?<\/strong> \n  <br \/><br \/>\n  <strong style=\"color: #110053;\">Hooks<\/strong> execute shell commands automatically using your <strong style=\"color: #110053;\">user\u2019s credentials<\/strong>, which makes them powerful but also potentially risky. Without proper safeguards, they can expose systems to vulnerabilities. Following best practices like <strong style=\"color: #110053;\">quoting variables, validating inputs, avoiding sensitive paths,<\/strong> and using <strong style=\"color: #110053;\">absolute paths<\/strong> is essential to ensure secure and reliable execution.\n  <br \/><br \/>\n<\/div>\n\n\n\n<ol>\n<li>They give Claude Code the project-specific knowledge it needs to make good decisions.<br><\/li>\n\n\n\n<li>They make Claude Code\u2019s behavior predictable by following your defined rules instead of guessing.<br><\/li>\n\n\n\n<li>They create a shared standard across your team so every developer gets consistent AI assistance.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why Development Teams Are Using CLAUDE.md Files<\/strong><\/h2>\n\n\n\n<ul>\n<li>Suggestions from Claude Code fit the project from the very first response, with no back and forth to correct the basics.<\/li>\n\n\n\n<li>The whole team gets consistent AI assistance because everyone is working from the same context file.<\/li>\n\n\n\n<li>New developers can use Claude Code productively faster because the file captures conventions that would otherwise take weeks to learn.<\/li>\n\n\n\n<li>Teams spend less time editing AI output and more time actually building.<\/li>\n\n\n\n<li>The process of writing a CLAUDE.md file forces teams to document their conventions clearly, which is useful even outside of AI tooling.<\/li>\n<\/ul>\n\n\n\n<p><strong>Read More: <\/strong><a href=\"https:\/\/www.guvi.in\/blog\/how-to-use-claude-code\/\" target=\"_blank\" rel=\"noreferrer noopener\">How to Use Claude Code: A Beginner\u2019s Guide<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4 Practical Use Cases for CLAUDE.md Files<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Use case 01: Large monorepos with multiple services<\/strong><\/h3>\n\n\n\n<p>When a codebase contains several services that each work differently, a root CLAUDE.md file can describe the overall structure and individual subfolder files can describe each service in detail. Claude Code reads both and knows exactly which rules apply where. Without this, suggestions for one service often bleed incorrect assumptions into another.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Use case 02: Teams with strict code style requirements<\/strong><\/h3>\n\n\n\n<p>Some teams have detailed linting rules, naming conventions, or formatting standards that go beyond what a generic linter enforces. A CLAUDE.md file captures these standards so Claude Code applies them automatically. The output matches what your reviewers expect without anyone having to explain the rules in every session.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Use case 03: Projects with complex build and test workflows<\/strong><\/h3>\n\n\n\n<p>When running the project or its tests involves more than a single command, Claude Code needs to know the exact sequence. A CLAUDE.md file with clear commands means Claude Code never suggests the wrong build step or misses a required environment variable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Use case 04: Teams onboarding new developers<\/strong><\/h3>\n\n\n\n<p>A well-written CLAUDE.md file doubles as onboarding documentation. New developers can read it to understand the project conventions and also use Claude Code as a guide that already knows those conventions. Both benefits come from the same file.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Step by Step: How to Write and Use a CLAUDE.md File<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 1: Start with the basics<\/strong><\/h3>\n\n\n\n<p>Open a new file called CLAUDE.md in the root of your project. Start with a two or three sentence description of what the project is, what it does, and what technology stack it runs on. This gives <a href=\"https:\/\/claude.com\/product\/claude-code\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Claude Code<\/a> the foundation it needs before anything else.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 2: List your commands<\/strong><\/h3>\n\n\n\n<p>Write out the exact commands for installing dependencies, running the development server, building for production, and running tests. Do not assume Claude Code already knows them. Even if they seem obvious, writing them out prevents mistakes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 3: Document your code style and conventions<\/strong><\/h3>\n\n\n\n<p>Go through the rules your team actually follows and write them down. This includes naming conventions, how you handle errors, whether you prefer certain patterns over others, and anything a code reviewer would flag if it was done the wrong way.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 4: Flag what to avoid<\/strong><\/h3>\n\n\n\n<p>List any libraries you do not use, folders that should never be modified, patterns your team has moved away from, or tools that conflict with your setup. This is one of the highest-value things you can put in the file because it prevents Claude Code from suggesting things that simply will not work.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 5: Describe your testing approach<\/strong><\/h3>\n\n\n\n<p>Explain where tests live, what framework you use, how files are named, and what level of coverage your team expects. Claude Code will then write and suggest tests that fit your existing structure instead of inventing a new one.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 6: Place the file correctly<\/strong><\/h3>\n\n\n\n<p>Put the main CLAUDE.md file in the root of your project. If a specific subfolder works very differently from the rest of the codebase, add a separate CLAUDE.md file inside that folder. You can also add one to your home directory for personal preferences that apply across all projects.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 7: Commit it to your repository<\/strong><\/h3>\n\n\n\n<p>Treat the CLAUDE.md file like any other important configuration file. Commit it so every developer on your team has access to the same context. This is what turns an individual productivity tool into a team-wide standard.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 8: Keep it updated<\/strong><\/h3>\n\n\n\n<p>Review the file whenever the project changes in a meaningful way. If you switch testing frameworks, change your folder structure, or adopt a new convention, update the file. A CLAUDE.md file that describes how the project used to work is worse than no file at all.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Features That Make CLAUDE.md Files Powerful<\/strong><\/h2>\n\n\n\n<ol>\n<li><strong>Automatic context loading<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Claude Code reads the file at the start of every session without you having to paste context or re-explain your project. The setup happens once and persists.<\/p>\n\n\n\n<ol start=\"2\">\n<li><strong>Multi-level specificity<\/strong><\/li>\n<\/ol>\n\n\n\n<p>You can have a root file for general project context, subfolder files for specific services or modules, and a home directory file for personal preferences. Claude Code combines them intelligently.<\/p>\n\n\n\n<ol start=\"3\">\n<li><strong>Team-wide consistency<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Because the file lives in the repository, every developer on the team works with the same context. <a href=\"https:\/\/www.guvi.in\/blog\/what-is-artificial-intelligence\/\">AI<\/a> assistance becomes predictable and consistent across the whole team.<\/p>\n\n\n\n<ol start=\"4\">\n<li><strong>Works with your existing tools<\/strong><\/li>\n<\/ol>\n\n\n\n<p>CLAUDE.md files do not replace linters, style guides, or documentation. They reference them and help Claude Code work alongside them instead of against them.<\/p>\n\n\n\n<ol start=\"5\">\n<li><strong>Reusable across sessions<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Every time you open a new Claude Code session on the same project, the file is already there. You never have to repeat yourself.<\/p>\n\n\n\n<ol start=\"6\">\n<li><strong>Plain text and easy to maintain<\/strong><\/li>\n<\/ol>\n\n\n\n<p>There is no special syntax to learn. It is just a markdown. Anyone on the team can read it, edit it, and understand it without any technical knowledge beyond basic writing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Pros and Cons of Using CLAUDE.md Files<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Pros:<\/strong><\/h3>\n\n\n\n<ul>\n<li>Claude Code produces project-appropriate output from the very first suggestion.<\/li>\n\n\n\n<li>The whole team gets consistent AI assistance from a single shared file.<\/li>\n\n\n\n<li>Writing the file forces useful documentation of conventions that often live only in people&#8217;s heads.<\/li>\n\n\n\n<li>Suggestions require less editing, which saves real time across many sessions.<\/li>\n\n\n\n<li>New developers can use Claude Code productively much faster.<\/li>\n\n\n\n<li>The file improves over time as the team refines it.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Cons:<\/strong><\/h3>\n\n\n\n<ul>\n<li>Writing a thorough CLAUDE.md file takes real time and thought upfront.<\/li>\n\n\n\n<li>The file needs ongoing maintenance as the project evolves.<\/li>\n\n\n\n<li>A poorly written or outdated file can mislead Claude Code and make output worse than having no file.<\/li>\n\n\n\n<li>Teams without clear conventions may find it hard to write the file because the conventions do not yet exist.<\/li>\n<\/ul>\n\n\n\n<div style=\"background-color: #099f4e; border: 3px solid #110053; border-radius: 12px; padding: 18px 22px; color: #FFFFFF; font-size: 18px; font-family: Montserrat, Helvetica, sans-serif; line-height: 1.7; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15); max-width: 750px;\">\n  <strong style=\"font-size: 22px; color: #FFFFFF;\">\ud83d\udca1 Did You Know?<\/strong> \n  <br \/><br \/>\n  Developers who provide <strong style=\"color: #110053;\">structured project context<\/strong> to AI coding tools spend significantly less time on <strong style=\"color: #110053;\">corrections and review cycles<\/strong>. Creating a <strong style=\"color: #110053;\">CLAUDE.md file<\/strong> helps the model understand your codebase, conventions, and goals \u2014 and this small investment often <strong style=\"color: #110053;\">pays off within the first few weeks<\/strong> of regular use.\n  <br \/><br \/>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Top Tips to Get Started<\/strong><\/h2>\n\n\n\n<ol>\n<li><strong>Start with commands and conventions only<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Do not try to cover everything in your first version. Write the commands, list three to five key conventions, and add anything Claude Code must never do. That alone will make a noticeable difference. Add more as you find gaps.<\/p>\n\n\n\n<ol start=\"2\">\n<li><strong>Write it like you are onboarding a new developer<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The best CLAUDE.md files are clear enough that a smart person with no prior context could follow them and produce work your team would accept. If you would not give the instruction to a new hire, it is probably not specific enough for a CLAUDE.md file either.<\/p>\n\n\n\n<ol start=\"3\">\n<li><strong>Include examples where possible<\/strong><\/li>\n<\/ol>\n\n\n\n<p>If you have a convention that is hard to describe in words, show an example of what good looks like and what bad looks like. Examples remove ambiguity faster than any amount of description.<\/p>\n\n\n\n<ol start=\"4\">\n<li><strong>Test it with a real task<\/strong><\/li>\n<\/ol>\n\n\n\n<p>After writing your first version, give Claude Code a task you have done manually before. Check whether the output matches what you would have produced. If something is off, look at the file and add the missing context.<\/p>\n\n\n\n<ol start=\"5\">\n<li><strong>Treat it as a living document<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The teams that get the most out of CLAUDE.md files are the ones who update them regularly. Schedule a quick review every month or whenever the project goes through a significant change. Small updates kept consistently beating one big overhaul done once a year.<\/p>\n\n\n\n<p>If you want to learn more about using CLAUDE.md files and Customizing Claude Code for your codebase, do not miss the chance to enroll in HCL GUVI&#8217;s <a href=\"https:\/\/www.guvi.in\/mlp\/artificial-intelligence-and-machine-learning?utm_source=blog&amp;utm_medium=hyperlink&amp;utm_campaign=using-claude-md-files\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Intel &amp; IITM Pravartak Certified Artificial Intelligence &amp; Machine Learning course<\/strong><\/a><strong>. <\/strong>Endorsed with <strong>Intel certification<\/strong>, this course adds a globally recognized credential to your resume, a powerful edge that sets you apart in the competitive AI job market.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p>Claude Code is a capable tool. But capability without context only goes so far. CLAUDE.md files are what close the gap between a generic AI assistant and one that actually knows your project, your team, and your standards.<\/p>\n\n\n\n<p>The good news is that getting started does not require a perfect file. Start with your commands, your key conventions, and a short list of things to avoid. Test it with a real task. Refine as you go.<\/p>\n\n\n\n<p>The development teams getting the most out of Claude Code right now are not the ones with the most complex setups. They are the ones who took the time to write a clear, honest CLAUDE.md file and keep it updated as their project grows.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>FAQs<\/strong><\/h2>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list \">\n<div id=\"faq-question-1775797223009\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">1. <strong>What is the difference between a CLAUDE.md file and a regular README?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>A README is written for human developers and explains what a project does and how to get started. A CLAUDE.md file is written specifically for Claude Code and focuses on the conventions, commands, and rules that shape how AI assistance should behave in the project. They serve different purposes and are worth having both.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1775797228735\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">2. <strong>Do I need technical knowledge to write a CLAUDE.md file?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>No. The file is plain markdown. If you can write a list and a few short paragraphs, you can write a useful CLAUDE.md file. The value comes from the clarity and specificity of what you write, not from any technical format.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1775797239596\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">3. <strong>How long should a CLAUDE.md file be?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Long enough to cover what matters, short enough to stay maintainable. Most useful CLAUDE.md files are between one and three pages. If yours is getting much longer than that, look for sections that can be simplified or removed.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1775797249011\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">4. <strong>Can the same CLAUDE.md file work for different projects?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Only partially. You can have a home directory CLAUDE.md file for preferences that apply everywhere. But the project-level file should be specific to that project. A file written for one codebase will not describe another one accurately enough to be useful.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1775797258541\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">5. <strong>How do I know if my CLAUDE.md file is working?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Test Claude Code on a task you have done before and compare the output to what you would have produced manually. If the output fits your conventions, uses the right tools, and avoids what you listed as off-limits, the file is working. If it still misses the mark, look at what context is missing and add it.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Claude Code is a powerful AI tool for developers. But like any tool, it works better when it knows your specific setup. That is where CLAUDE.md files come in. A CLAUDE.md file is a simple text file you place in your project. It tells Claude Code important things about your codebase: how it is structured, [&hellip;]<\/p>\n","protected":false},"author":63,"featured_media":106586,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[933],"tags":[],"views":"29","authorinfo":{"name":"Vishalini Devarajan","url":"https:\/\/www.guvi.in\/blog\/author\/vishalini\/"},"thumbnailURL":"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2026\/04\/CLAUDE.md-files-300x112.webp","jetpack_featured_media_url":"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2026\/04\/CLAUDE.md-files.webp","_links":{"self":[{"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/posts\/106537"}],"collection":[{"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/users\/63"}],"replies":[{"embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/comments?post=106537"}],"version-history":[{"count":4,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/posts\/106537\/revisions"}],"predecessor-version":[{"id":106588,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/posts\/106537\/revisions\/106588"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/media\/106586"}],"wp:attachment":[{"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/media?parent=106537"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/categories?post=106537"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/tags?post=106537"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}