Struct Message 

pub struct Message {
    pub msg_id: String,
    pub role: Role,
    pub content: String,
    pub images: Vec<ImageRef>,
    pub content_blocks: Vec<ContentBlock>,
    pub alt_index: Option<u32>,
    pub alt_count: Option<u32>,
    pub alternatives: Vec<MessageAlternative>,
    pub timestamp: String,
}

A chat message. One shape everywhere — no polymorphism.

content_blocks is the canonical content representation. content is a derived convenience field (human-readable text summary). On disk, only content_blocks is stored; content is derived on load.

Fields

msg_id: String

role: Role

content: String

images: Vec<ImageRef>

content_blocks: Vec<ContentBlock>

alt_index: Option<u32>

alt_count: Option<u32>

alternatives: Vec<MessageAlternative>

timestamp: String

Implementations

impl Message

pub fn normalize(&mut self)

Ensure content and content_blocks are consistent after deserialization.

Handles both old format (content only) and new format (content_blocks only):

• Old: wraps content in a Text block
• New: derives content from blocks

pub fn is_tool_result_only(&self) -> bool

True when this is a user-role message whose content consists entirely of ToolResult blocks — i.e. a synthetic tool-loop message rather than a real user turn.

Used by compaction, history rendering, and turn-counting logic.

pub fn serialize_for_storage(&self) -> Result<String, Error>

Serialize for disk storage, omitting the redundant content field and stripping inline data from image refs.

The wire protocol (History, log command) still includes content via normal serde serialization. This method is only for JSONL persistence.

Trait Implementations

impl Clone for Message

fn clone(&self) -> Message

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Message

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Message

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Message

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

where __S: Serializer,

Serialize this value into the given Serde serializer.