[BUG] CLAUDE.md regularly non-compliant with npx markdownlint and similar quality validation tools

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Claude code regularly creates and edits CLAUDE.md and other markdown files in violation of standard markdown tools such as npx markdownlint . This creates a loop of needless errors and problems that are completely solved by adhering to standard rules and practices in markdown file generation and editing.

What Should Happen?

Claude should follow industry standard practices for markdown file creation.

Error Messages/Logs

<img width="2164" height="753" alt="Image" src="https://github.com/user-attachments/assets/cce08e82-8910-417a-b9f7-66a622d4f125" />

Steps to Reproduce

1. Ask Claude code to generate or edit claude.md or other documentation markdown file.
2. Submit to GitHub for PR
3. See dozens or more issues when npx markdownlint, codacy, or other similar validation tools are part of your ci/cd.

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.0.112

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_