Enum ContentBlock 

pub enum ContentBlock {
    TextContent(TextContent),
    ImageContent(ImageContent),
    AudioContent(AudioContent),
    ResourceLink(ResourceLink),
    EmbeddedResource(EmbeddedResource),
}

Latest MCP Protocol 2025_11_25 ContentBlock

JSON schema

{
 "anyOf": [
   {
     "$ref": "#/$defs/TextContent"
   },
   {
     "$ref": "#/$defs/ImageContent"
   },
   {
     "$ref": "#/$defs/AudioContent"
   },
   {
     "$ref": "#/$defs/ResourceLink"
   },
   {
     "$ref": "#/$defs/EmbeddedResource"
   }
 ]
}

Variants

TextContent(TextContent)

ImageContent(ImageContent)

AudioContent(AudioContent)

ResourceLink(ResourceLink)

EmbeddedResource(EmbeddedResource)

Implementations

impl ContentBlock

pub fn text_content(text: String) -> Self

Create a ContentBlock::TextContent

pub fn image_content(data: String, mime_type: String) -> Self

Create a ContentBlock::ImageContent

pub fn audio_content(data: String, mime_type: String) -> Self

Create a ContentBlock::AudioContent

pub fn resource_link(value: ResourceLink) -> Self

Create a ContentBlock::ResourceLink

pub fn embedded_resource(resource: EmbeddedResourceResource) -> Self

Create a ContentBlock::EmbeddedResource

pub fn content_type(&self) -> &str

Returns the content type as a string based on the variant of ContentBlock

pub fn as_text_content(&self) -> Result<&TextContent, RpcError>

Converts the content to a reference to TextContent, returning an error if the conversion is invalid.

pub fn as_image_content(&self) -> Result<&ImageContent, RpcError>

Converts the content to a reference to TextContent, returning an error if the conversion is invalid.

pub fn as_audio_content(&self) -> Result<&AudioContent, RpcError>

Converts the content to a reference to TextContent, returning an error if the conversion is invalid.

pub fn as_resource_link(&self) -> Result<&ResourceLink, RpcError>

Converts the content to a reference to TextContent, returning an error if the conversion is invalid.

pub fn as_embedded_resource(&self) -> Result<&EmbeddedResource, RpcError>

Converts the content to a reference to TextContent, returning an error if the conversion is invalid.

pub fn embedded_text_resource<U, M, T>(uri: U, mime_type: M, text: T) -> Self

where U: Into<String>, M: Into<String>, T: Into<String>,

Build a ContentBlock::EmbeddedResource carrying a text payload (e.g. JSON, plain text, source code).

Shortcut for:

EmbeddedResource::new(
    EmbeddedResourceResource::TextResourceContents(
        TextResourceContents::new(text, uri).with_mime_type(mime_type),
    ),
    None, None,
).into()

pub fn embedded_blob_resource<U, M, D>( uri: U, mime_type: M, base64_data: D, ) -> Self

where U: Into<String>, M: Into<String>, D: Into<String>,

Build a ContentBlock::EmbeddedResource carrying a base64-encoded binary payload (images, audio, arbitrary file blobs).

base64_data must already be base64-encoded.

Trait Implementations

impl Clone for ContentBlock

fn clone(&self) -> ContentBlock

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ContentBlock

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ContentBlock

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<AudioContent> for ContentBlock

fn from(value: AudioContent) -> Self

Converts to this type from the input type.

impl From<EmbeddedResource> for ContentBlock

fn from(value: EmbeddedResource) -> Self

Converts to this type from the input type.

impl From<ImageContent> for ContentBlock

fn from(value: ImageContent) -> Self

Converts to this type from the input type.

impl From<ResourceLink> for ContentBlock

fn from(value: ResourceLink) -> Self

Converts to this type from the input type.

impl From<TextContent> for ContentBlock

fn from(value: TextContent) -> Self

Converts to this type from the input type.

impl Serialize for ContentBlock

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.