Enum ContentBlock 

pub enum ContentBlock {
    Text {
        text: String,
        annotations: Option<Annotations>,
        meta: Option<HashMap<String, Value>>,
    },
    Image {
        data: String,
        mime_type: String,
        annotations: Option<Annotations>,
        meta: Option<HashMap<String, Value>>,
    },
    Audio {
        data: String,
        mime_type: String,
        annotations: Option<Annotations>,
        meta: Option<HashMap<String, Value>>,
    },
    ResourceLink {
        resource: ResourceReference,
        annotations: Option<Annotations>,
        meta: Option<HashMap<String, Value>>,
    },
    Resource {
        resource: ResourceContents,
        annotations: Option<Annotations>,
        meta: Option<HashMap<String, Value>>,
    },
}

Content block union type matching MCP 2025-06-18 specification exactly

Variants

Text

Text content

Fields

text: String

annotations: Option<Annotations>

meta: Option<HashMap<String, Value>>

Image

Image content

Fields

data: String

Base64-encoded image data

mime_type: String

MIME type of the image

annotations: Option<Annotations>

meta: Option<HashMap<String, Value>>

Audio

Audio content

Fields

data: String

Base64-encoded audio data

mime_type: String

MIME type of the audio

annotations: Option<Annotations>

meta: Option<HashMap<String, Value>>

ResourceLink

Resource link (ResourceLink from MCP spec)

Fields

resource: ResourceReference

annotations: Option<Annotations>

meta: Option<HashMap<String, Value>>

Resource

Embedded resource (EmbeddedResource from MCP spec)

Fields

resource: ResourceContents

annotations: Option<Annotations>

meta: Option<HashMap<String, Value>>

Implementations

impl ContentBlock

pub fn text(text: impl Into<String>) -> ContentBlock

Create text content

pub fn text_with_annotations( text: impl Into<String>, annotations: Annotations, ) -> ContentBlock

Create text content with annotations

pub fn image( data: impl Into<String>, mime_type: impl Into<String>, ) -> ContentBlock

Create image content

pub fn audio( data: impl Into<String>, mime_type: impl Into<String>, ) -> ContentBlock

Create audio content

pub fn resource_link(resource: ResourceReference) -> ContentBlock

Create resource link

pub fn resource(resource: ResourceContents) -> ContentBlock

Create embedded resource

pub fn with_annotations(self, annotations: Annotations) -> ContentBlock

Add annotations to any content block

pub fn with_meta(self, meta: HashMap<String, Value>) -> ContentBlock

Add meta to any content block

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<(), Error>

Formats the value using the given formatter.

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

fn deserialize<__D>( __deserializer: __D, ) -> Result<ContentBlock, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ContentBlock

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

where __S: Serializer,

Serialize this value into the given Serde serializer.