Struct ChatMessage 

pub struct ChatMessage {
    pub role: String,
    pub content: Option<String>,
    pub multimodal_content: Option<Vec<ContentPart>>,
    pub tool_calls: Option<Vec<MessageToolCall>>,
    pub tool_call_id: Option<String>,
}

Chat message (OpenAI shape: role, optional content, optional tool_calls, optional tool_call_id for role “tool”)

Fields

role: String

content: Option<String>

Text-only content (for backward compatibility)

multimodal_content: Option<Vec<ContentPart>>

Multimodal content (text + images) - providers should prefer this if present

tool_calls: Option<Vec<MessageToolCall>>

tool_call_id: Option<String>

Implementations

impl ChatMessage

pub fn system(content: impl Into<String>) -> Self

pub fn user(content: impl Into<String>) -> Self

pub fn user_with_images<S: Into<String>>( text: S, images: Vec<(Vec<u8>, String)>, ) -> Self

User message with images (multimodal content for vision models)

Creates a user message with text and one or more images. The images should be provided as base64-encoded data with their MIME type.

Example

let msg = ChatMessage::user_with_images(
    "Describe this image",
    vec![("data:image/jpeg;base64,...", "image/jpeg")],
);

pub fn assistant(content: impl Into<String>) -> Self

pub fn assistant_with_tool_calls( content: Option<String>, tool_calls: Vec<MessageToolCall>, ) -> Self

Assistant message with tool calls (content may be None or empty)

pub fn tool_result( tool_call_id: impl Into<String>, content: impl Into<String>, ) -> Self

Tool result message (role “tool”)

pub fn has_images(&self) -> bool

Check if this message contains multimodal content (images)

pub fn effective_content(&self) -> MessageContent

Get the effective content for serialization to providers Returns either multimodal content parts or text-only content

Trait Implementations

impl Clone for ChatMessage

fn clone(&self) -> ChatMessage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChatMessage

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ChatMessage

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ChatMessage

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

where __S: Serializer,

Serialize this value into the given Serde serializer.