Struct Content 

pub struct Content {
    pub role: String,
    pub parts: Vec<Part>,
}

Core traits and types.

Always available regardless of feature flags. Includes:

• Agent - The fundamental trait for all agents
• Tool / Toolset - For extending agents with capabilities
• Session / State - For managing conversation context
• Event - For streaming agent responses
• AdkError / Result - Unified error handling A message in a conversation, consisting of a role and content parts.

Fields

role: String

The role of this content’s author (e.g., “user”, “model”, “function”).

parts: Vec<Part>

The parts that make up this content (text, data, function calls, etc.).

Implementations

impl Content

pub fn has_function_calls(&self) -> bool

Returns true if any part of this content is a function (tool) call.

Useful for deciding response semantics — e.g. a model turn that emits tool calls is not complete, since tool results must still be processed and sent back.

Example

use adk_core::{Content, Part};

let mut content = Content::new("model").with_text("calling a tool");
assert!(!content.has_function_calls());

content.parts.push(Part::FunctionCall {
    name: "get_weather".to_string(),
    args: serde_json::json!({}),
    id: None,
    thought_signature: None,
});
assert!(content.has_function_calls());

pub fn new(role: impl Into<String>) -> Content

Creates a new empty content with the given role.

pub fn with_text(self, text: impl Into<String>) -> Content

Appends a text part to this content.

pub fn with_inline_data( self, mime_type: impl Into<String>, data: Vec<u8>, ) -> Content

Add inline binary data (e.g., image bytes).

Panics

Panics if data exceeds MAX_INLINE_DATA_SIZE (10 MB).

pub fn with_thinking(self, thinking: impl Into<String>) -> Content

Add a thinking/reasoning trace part.

pub fn with_file_uri( self, mime_type: impl Into<String>, file_uri: impl Into<String>, ) -> Content

Add a file reference by URI (URL or cloud storage path).

pub fn with_embedded_resource(self, resource: EmbeddedResource) -> Content

Add an embedded resource part (a source URI plus inline text or binary contents).

Example

use adk_core::{Content, EmbeddedResource, TextResourceContents};

let content = Content::new("user").with_embedded_resource(EmbeddedResource::Text(
    TextResourceContents::new("file:///readme.md", Some("text/markdown".to_string()), "# Hi"),
));
assert_eq!(content.parts.len(), 1);

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<(), Error>

Formats the value using the given formatter.

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

fn deserialize<__D>( __deserializer: __D, ) -> Result<Content, <__D as Deserializer<'de>>::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 as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.