Enum Content 

pub enum Content {
    Text {
        text: String,
        annotations: Option<ContentAnnotations>,
    },
    Image {
        data: String,
        mime_type: String,
        annotations: Option<ContentAnnotations>,
    },
    Audio {
        data: String,
        mime_type: String,
        annotations: Option<ContentAnnotations>,
    },
    Resource {
        resource: ResourceContent,
        annotations: Option<ContentAnnotations>,
    },
    ResourceLink {
        uri: String,
        name: Option<String>,
        description: Option<String>,
        mime_type: Option<String>,
        annotations: Option<ContentAnnotations>,
    },
}

Content types for tool results, resources, and prompts.

Content can be text, images, audio, or embedded resources. Each variant supports optional annotations for audience targeting and priority hints.

Variants

Text

Plain text content.

Fields

text: String

The text content.

annotations: Option<ContentAnnotations>

Optional annotations for this content.

Image

Base64-encoded image content.

Fields

data: String

Base64-encoded image data.

mime_type: String

MIME type (e.g., “image/png”, “image/jpeg”).

annotations: Option<ContentAnnotations>

Optional annotations for this content.

Audio

Base64-encoded audio content.

Fields

data: String

Base64-encoded audio data.

mime_type: String

MIME type (e.g., “audio/wav”, “audio/mp3”).

annotations: Option<ContentAnnotations>

Optional annotations for this content.

Resource

Embedded resource content.

Fields

resource: ResourceContent

The embedded resource.

annotations: Option<ContentAnnotations>

Optional annotations for this content.

ResourceLink

Link to a resource (without embedding the content)

Fields

uri: String

URI of the resource

name: Option<String>

Human-readable name

description: Option<String>

Description of the resource

mime_type: Option<String>

MIME type of the resource

annotations: Option<ContentAnnotations>

Implementations

impl Content

pub fn as_text(&self) -> Option<&str>

Extract the text from a Content::Text variant.

Returns None for non-text content variants.

Example

use tower_mcp::Content;

let content = Content::Text { text: "hello".into(), annotations: None };
assert_eq!(content.as_text(), Some("hello"));

Trait Implementations

impl Clone for Content

fn clone(&self) -> Content

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Content

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Content

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Content

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

where __S: Serializer,

Serialize this value into the given Serde serializer.