Enum ContentBlock 

pub enum ContentBlock {
    Text(TextBlock),
    Image(ImageBlock),
    ToolUse(ToolUseBlock),
    ToolResult(ToolResultBlock),
}

Multi-modal content blocks that can appear in messages.

Messages are composed of one or more content blocks, allowing rich, structured communication between the user, assistant, and tools.

Serialization

Uses serde’s “externally tagged” enum format with a "type" field:

{"type": "text", "text": "Hello"}
{"type": "tool_use", "id": "call_123", "name": "search", "input": {...}}
{"type": "tool_result", "tool_use_id": "call_123", "content": {...}}

Block Types

• Text: Simple text content
• Image: Image content (URL or base64)
• ToolUse: Request from model to execute a tool
• ToolResult: Result of tool execution

Usage

Messages can contain multiple blocks. For example, a user message might include text and an image, or an assistant message might include text followed by a tool use request.

Variants

Text(TextBlock)

Text content block containing a string message.

Image(ImageBlock)

Image content block for vision-capable models.

ToolUse(ToolUseBlock)

Tool use request from the model to execute a function.

ToolResult(ToolResultBlock)

Tool execution result sent back to the model.

Trait Implementations

impl Clone for ContentBlock

fn clone(&self) -> ContentBlock

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ContentBlock

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ContentBlock

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ContentBlock

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

where __S: Serializer,

Serialize this value into the given Serde serializer.