Struct ConversationMessage 

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

A single message in a conversation.

Fields

role: MessageRole

The role of the message sender.

content: String

Text content of the message (may be empty for pure tool-call messages).

tool_calls: Vec<ToolCall>

Tool calls made by the assistant (only present when role is Assistant).

tool_call_id: Option<String>

The tool call ID this message is responding to (only present when role is Tool).

tool_name: Option<String>

The tool name this result corresponds to (only present when role is Tool).

Implementations

impl ConversationMessage

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

Create a system message.

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

Create a user message.

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

Create an assistant message with text content.

pub fn assistant_tool_calls(tool_calls: Vec<ToolCall>) -> Self

Create an assistant message with tool calls.

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

Create a tool result message.

pub fn estimate_tokens(&self) -> usize

Estimate token count for this message.

Uses ~3.3 chars/token (Anthropic’s tokenizer averages 3-3.5 for mixed content including JSON, code, and prose). Adds per-message framing overhead for the role field, JSON structure, and tool metadata that the API sees but we don’t count in raw content length.

Trait Implementations

impl Clone for ConversationMessage

fn clone(&self) -> ConversationMessage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ConversationMessage

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ConversationMessage

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ConversationMessage

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

where __S: Serializer,

Serialize this value into the given Serde serializer.