[MODEL] Report unexpected Claude model behavior, incorrect actions, or permission violations

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

CLAUDE_CODE_BUG_REPORT.md

What Claude Actually Did

CLAUDE_CODE_BUG_REPORT.md

• Refactored entire codebase (381→501 lines)
• Removed critical safety mechanism
• Caused infinite loop and 200+ duplicate threads

Expected Behavior

Add only 4 lines for duplicate check

Files Affected

Permission Mode

Accept Edits was ON (auto-accepting changes)

Can You Reproduce This?

Yes, every time with the same prompt

Steps to Reproduce

_No response_

Claude Model

Sonnet

Relevant Conversation

Impact

Critical - Data loss or corrupted project

Claude Code Version

Claude Code Version: Latest (as of 2025-12-28) Model: Claude Sonnet 4.5 (claude-sonnet-4-5-20250929) Platform: macOS (Darwin 25.1.0)

Platform

Anthropic API

Additional Context

_No response_