Struct ChatMessage 

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

Represents a message in the chat history sequence sent to/from the AI.

This struct is used for all roles (system, user, assistant, tool) within the conversation history managed by the Agent. Optional fields are handled by serde during serialization/deserialization.

Fields

role: String

The role of the message sender (e.g., “system”, “user”, “assistant”, “tool”).

content: Option<String>

The text content of the message. Present for system, user, and final assistant messages, and tool messages.

tool_calls: Option<Vec<ToolCall>>

A list of tool calls requested by the assistant. Only present for assistant messages that request tool execution.

tool_call_id: Option<String>

The ID of the tool call this message is responding to. Only present for tool messages.

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 Default for ChatMessage

fn default() -> ChatMessage

Returns the “default value” for a type.

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.