Aseprite MCP Tools

Instructions

Implementation Reference

• aseprite_mcp/tools/drawing.py:159-200 (handler)

  The `draw_circle` function acts as the MCP tool handler, validating inputs and invoking the `LuaBuilder` to generate and execute the Lua script for Aseprite.

  async def draw_circle(filename: str, center_x: int, center_y: int, radius: int, color: str = "#000000", fill: bool = False) -> str:
      """Draw a circle on the canvas.
  
      Args:
          filename: Name of the Aseprite file to modify
          center_x: X coordinate of circle center
          center_y: Y coordinate of circle center
          radius: Radius of the circle in pixels
          color: Hex color code (default: "#000000")
          fill: Whether to fill the circle (default: False)
      """
      try:
          # Validate inputs
          file_path = validate_file_path(filename, must_exist=True)
          color = validate_color(color)
          
          if radius < 1:
              raise ValidationError("radius", radius, "Radius must be at least 1")
          
          # Build Lua script
          builder = LuaBuilder()
          builder.add_line('local spr = app.activeSprite')
          builder.if_condition('not spr')
          builder.add_line('error("No active sprite")')
          builder.end_if()
          builder.add_line()
          
          builder.begin_transaction()
          builder.draw_circle(center_x, center_y, radius, color, fill)
          builder.end_transaction()
          builder.save_sprite()
          
          # Execute script
          cmd = get_command()
          success, output = cmd.execute_lua_script(builder.build(), str(file_path))
          
          return f"Circle drawn successfully in {file_path}"
          
      except (ValidationError, AsepriteError) as e:
          return f"Failed to draw circle: {e}"
      except Exception as e:
          return f"Unexpected error: {e}"