[MODEL] Claude ignores CLAUDE.md and produces incomplete or misconfigured implementations

Preflight Checklist

• [x] I have searched existing issues for similar behavior reports
• [x] This report does NOT contain sensitive information (API keys, passwords, etc.)

Type of Behavior Issue

Claude modified files I didn't ask it to modify

What You Asked Claude to Do

• Follow the project rules and constraints defined in CLAUDE.md
• Implement the requested features completely and according to the documented expectations
• Add or update tests as required by the project
• Ensure tests are correctly configured and aligned with the existing test setup

What Claude Actually Did

• Ignored or only partially followed the instructions in CLAUDE.md
• Delivered incomplete feature implementations with missing functionality
• Omitted tests or produced tests that were misconfigured or incompatible
• Required significant manual cleanup and rework to correct these issues

Expected Behavior

• CLAUDE.md is treated as a primary source of project instructions and consistently followed
• Requested features are implemented fully and according to the documented requirements
• Tests are added or updated when expected and are correctly configured
• Outputs are complete and reliable, minimizing the need for manual cleanup or rework

Files Affected

- CLAUDE.md

Permission Mode

Accept Edits was ON (auto-accepting changes)

Can You Reproduce This?

Sometimes (intermittent)

Steps to Reproduce

_No response_

Claude Model

Sonnet

Relevant Conversation

Impact

Critical - Data loss or corrupted project

Claude Code Version

2.1.11

Platform

Anthropic API

Additional Context

_No response_