Add file validation section to llms.txt docs

ai/llmstxt.mdx

@@ -1,6 +1,6 @@
 ---
 title: "llms.txt"
 description: "Automatically generate llms.txt and llms-full.txt files so AI tools like ChatGPT and Claude can index and understand your documentation."
 keywords: ["llms.txt", "LLM indexing", "AEO", "GEO", "content discovery"]
 ---
 
@@ -11,21 +11,21 @@
 Mintlify automatically hosts an `llms.txt` file at the root of your project that lists all available pages in your documentation. This file is always up to date and requires zero maintenance. You can optionally add a custom `llms.txt` file to the root of your project.
 
 <Note>
   If your site requires authentication, `llms.txt` and `llms-full.txt` also require authentication to view. LLMs and AI tools that cannot authenticate into your site cannot access these files. The files exclude pages that belong to [user groups](/deploy/authentication-setup#control-access-with-groups).
 
   For more information on how authentication affects AI features, see [Feature availability](/deploy/authentication-setup#feature-availability).
 </Note>
 
 View your `llms.txt` by appending `/llms.txt` to your documentation site's URL. Mintlify also hosts the file at `/.well-known/llms.txt` for compatibility with tools that follow the `.well-known` convention.
 
 <PreviewButton href="https://mintlify.com/docs/llms.txt">Open the llms.txt for this site.</PreviewButton>
 
 Mintlify adds HTTP headers to every page response so AI tools can discover your `llms.txt` files without prior knowledge of their location:
 
 - `Link: </llms.txt>; rel="llms-txt", </llms-full.txt>; rel="llms-full-txt"`: Follows the standard HTTP `Link` header format for resource discovery.
 - `X-Llms-Txt: /llms.txt`: A convenience header for tools that check for `llms.txt` support.
 
 ## llms.txt structure
 
 An `llms.txt` file is a plain Markdown file that contains:
 
@@ -66,8 +66,12 @@
 
 Mintlify automatically hosts an `llms-full.txt` file at the root of your project. View your `llms-full.txt` by appending `/llms-full.txt` to your documentation site's URL. Mintlify also hosts the file at `/.well-known/llms-full.txt` for compatibility with tools that follow the `.well-known` convention.
 
 <PreviewButton href="https://mintlify.com/docs/llms-full.txt">Open the llms-full.txt for this site.</PreviewButton>
 
+## Validate your files
+
+Run [`mint score`](/cli/commands#mint-score) to check the quality of your `llms.txt` and `llms-full.txt` files. The command validates that each file is reachable, well-structured, appropriately sized, and that the links inside it resolve correctly.
+
 ## Custom files
 
 To add a custom `llms.txt` or `llms-full.txt` file, create an `llms.txt` or `llms-full.txt` file at the root of your project. Adding a custom file overrides the automatically generated file of the same name. If you delete a custom file, Mintlify restores the automatically generated file.