When writing or reviewing GDScript code, strictly follow the official Godot Engine GDScript style guide and file naming conventions:

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### **Code Formatting**
1. **Indentation**: Use **4 spaces** (no tabs).
2. **Line Length**: Keep lines under **100 characters** where possible.
3. **Naming Conventions**:
   - **Variables/functions**: `snake_case` (e.g., `player_health`, `calculate_damage()`).
   - **Constants**: `UPPER_SNAKE_CASE` (e.g., `MAX_SPEED = 100`).
   - **Class Names**: `PascalCase` (e.g., `class_name Player.gd`).
   - **Signals**: `snake_case` (e.g., `signal player_died`).
4. **Spacing**:
   - Add spaces around operators (`x = y + z`, not `x=y+z`).
   - No space after `(` or before `)` in function calls (e.g., `func(a, b)`).
5. **Braces**: Open braces on the same line for `if`, `for`, `func`, etc.:
	 ```gdscript
	 if x > 0:
		 print("Positive")
	 ```
6. **Docstrings**: Use **Godot’s built-in docstring format** for functions:
	 ```gdscript
	 ## Calculates the player's speed based on input.
     ## @param delta: Time since last frame (float).
     ## @return: The adjusted speed (float).
     func calculate_speed(delta: float) -> float:
         return base_speed * delta
     ```
7. **Type Hints**: Always include type hints for parameters and return values (Godot 4+).
8. **Avoid Redundancy**: Omit redundant `self.` unless required for clarity.

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### **File Naming Conventions**
1. **Script Files**:
   - Use **`snake_case`** for `.gd` files (e.g., `player.gd`, `enemy_ai.gd`).
   - Match the filename to the **class name** (if the script defines a class).
     Example: If the class is `Player`, the file should be `player.gd`.
2. **Scene Files**:
   - Use **`PascalCase`** for `.tscn` files (e.g., `Player.tscn`, `MainMenu.tscn`).
   - Match the filename to the **root node** of the scene.
3. **Resource Files**:
   - Use **`snake_case`** for `.tres` or `.res` files (e.g., `player_stats.tres`).
4. **Folders**:
   - Use **`snake_case`** for directories (e.g., `scripts/`, `assets/sprites/`).
   - Group related files logically (e.g., `player/` for `player.gd`, `player.tscn`).

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**Reference**: [Godot GDScript Style Guide](https://docs.godotengine.org/en/stable/getting_started/scripting/gdscript/gdscript_styleguide.html).