no-heredoc

# MANDATORY: File Operation Override

This instruction applies to ALL agents and ALL file operations. It takes precedence over any other learned behavior.

## The Problem

Terminal heredoc operations are BROKEN in VS Code's Copilot integration. They cause:

- File corruption from tab characters triggering shell completion
- Mangled content from quote/backtick escaping failures
- Truncated files from exit code 130 interruptions
- Garbage output from special character interpretation

## The Rule

**BEFORE writing ANY terminal command that creates or modifies a file, STOP.**

Ask yourself: "Am I about to use `cat`, `echo`, `printf`, `tee`, or `>>`/`>` to write content to a file?"

If YES → **DO NOT EXECUTE.** Use file editing tools instead.

## Forbidden Patterns

```bash
# ALL OF THESE CORRUPT FILES - NEVER USE THEM
cat > file << EOF
cat > file << 'EOF'
cat > file <<EOF
cat > file <<'EOF'
cat > file <<-EOF
cat >> file << EOF
echo "multi
line" > file
printf '%s\n' "line1" "line2" > file
tee file << EOF
tee file << 'EOF'
```

## Required Approach

Instead of terminal commands for file content:

- **New files** → Use the file creation/editing tool provided by your environment
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