[BUG] **Claude Code ignores checklist from tool call hooks and repeatedly makes same failed modifications (907 times in 11 days)**

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 completely ignores user-defined workflows even when:

1. Tool call hook successfully initializes a checklist - Hook runs at session start, outputs success message, but Claude never reads or uses the checklist file
2. CLAUDE.md contains explicit step-by-step guidelines - Claude bypasses all steps and immediately modifies files
3. User repeatedly instructs to follow the checklist - Instructions are acknowledged but not followed

What Should Happen?

1. Claude Code should read hook-generated files when hooks output file paths
2. Claude Code should follow CLAUDE.md workflows before making code modifications
3. Claude Code should not repeat modifications that were reverted or failed previously
4. Claude Code should obey explicit user instructions

Error Messages/Logs

Steps to Reproduce

1. Create .claude/settings.json with a hook that generates a checklist:

```json
{
"hooks": {
"user-prompt-submit": [
{
"matcher": ".*",
"hooks": [
{
"type": "command",
"command": "cat > /tmp/checklist.md << 'EOF'\n# Checklist\n- [ ] Read CLAUDE.md\n- [ ] Search web first\n- [ ] Make single modification\nEOF\necho '✓ Checklist: /tmp/checklist.md'"
}
]
}
]
}
}

1. Create CLAUDE.md with explicit workflow:

## Mandatory Workflow

1. Read this CLAUDE.md first
2. Read /tmp/checklist.md
3. Check off items as you complete them

1. Start Claude Code session - hook outputs success:

SessionStart hook success: ✓ Checklist: /tmp/checklist.md

1. Ask Claude to do any coding task
2. After session, check /tmp/checklist.md:

cat /tmp/checklist.md

Result: All items remain [ ] unchecked - Claude never read or used the checklist despite hook success message being visible.

---

核心問題：Hook 執行成功，但 Claude 完全不讀取 hook 產生的檔案。

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.3

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_