354def _safe_resolve(path_str: str) -> Path:
355    """Resolve a path and ensure it's within the allowed directory."""
356    resolved = Path(path_str).resolve()
357    try:
358        resolved.relative_to(projects_dir.resolve())
359    except ValueError:
360        raise ValueError(
361            f"Access denied: path {resolved} is outside "
362            f"the Unity projects directory {projects_dir}"
363        )
364    return resolved

452@mcp.tool()
453def write_file(file_path: str, content: str) -> str:
454    """Write or overwrite a file within the Unity projects folder.
455    Creates parent directories if they don't exist.
456    Example: write_file('MyGame/Assets/Scripts/NewScript.cs', '...')"""
457    full_path = _safe_resolve(str(projects_dir / file_path))
458    full_path.parent.mkdir(parents=True, exist_ok=True)
459    full_path.write_text(content, encoding="utf-8")
460    return f"Successfully wrote{len(content)} chars to{file_path}"

505@mcp.tool()
506def grep_in_project(
507    query: str,
508    project_name: str = "",
509    pattern: str = "*.cs",
510    case_sensitive: bool = False,
511    use_regex: bool = False,
512    max_matches: int = 200,
513) -> str:
514    """Search file contents within a Unity project for a string or regex pattern.
515    ...
516    Leave project_name empty to search across all projects."""
517    base = _safe_resolve(str(projects_dir / project_name)) if project_name else projects_dir

366@mcp.tool()
367def list_unity_projects() -> str:
368    """List all Unity projects in the configured Unity Projects folder.
369    Identifies projects by the presence of an Assets directory."""