ToolResult always returns as "Text" with without be decoded

Is your feature request related to a problem? Please describe.
I've created a tool using the McpServerTool attribute that returns a list of DTOs.
I'm using this tool through a MCP Client inside a chat, everything works fine but I noticed that the result of the tool is a JSON serialized with the result of the tool like this:

{"content":[{"type":"text","text":"[\r\n {\r\n \u0022id\u0022: \u00224309-76-LQ21\u0022,\r\n \u0022procuringEntityName\u0022: \u0022HOSPITAL GUILLERMO GRANT BENAVENTE DE CO\u0022\r\n },\r\n {\r\n \u0022id\u0022: \u00221380-4-LQ21\u0022,\r\n \u0022procuringEntityName\u0022: \u0022Hospital Doctor Hern\\u00E1n Henr\\u00EDquez Aravena\u0022\r\n },\r\n {\r\n \u0022id\u0022: \u00221058095-30-LE21\u0022,\r\n \u0022procuringEntityName\u0022: \u0022COMPLEJO ASISTENCIAL DR. SOTERO DEL RIO\u0022\r\n },\r\n {\r\n \u0022id\u0022: \u00221058095-34-LE21\u0022,\r\n \u0022procuringEntityName\u0022: \u0022COMPLEJO ASISTENCIAL DR. SOTERO DEL RIO\u0022\r\n },\r\n {\r\n \u0022id\u0022: \u0022359-30-LP21\u0022,\r\n \u0022procuringEntityName\u0022: \u0022Instituto Nacional del Cancer\u0022\r\n }\r\n]"}]}

That content contains a lot of extra characters that causes that the token consumption be more than the expected.

Describe the solution you'd like
Is there any chance to modify the standard result to avoid this behavior?

Describe alternatives you've considered
I went deep into the codebase looking for any option that help me to accomplish that but I found nothing.

Additional context

El issue no menciona archivos fuente, tests ni puntos de entrada; empieza rastreando cómo una herramienta MCP que devuelve listas de DTO se convierte en el contenido de texto estándar de ToolResult. Compara el resultado serializado con la representación solicitada y define el comportamiento esperado con los maintainers. Hecho cuando el resultado evita la codificación innecesaria y los tests cubren el caso de listas de DTO.