Struct Part 

pub struct Part {
    pub id: String,
    pub kind: PartKind,
    pub content: String,
    pub attachment: Option<PartAttachment>,
    pub tool_call_id: Option<String>,
    pub tool_name: Option<String>,
    pub tool_replay: Option<ProviderReplayMeta>,
    pub prune_state: PruneState,
    pub reasoning_meta: Option<ProviderReasoningReplay>,
    pub response_meta: Option<ResponseTextMeta>,
}

Fields

id: String

e.g. “m3.p0”

kind: PartKind

content: String

attachment: Option<PartAttachment>

tool_call_id: Option<String>

tool_name: Option<String>

tool_replay: Option<ProviderReplayMeta>

Opaque provider replay state attached to a ToolCall part.

prune_state: PruneState

reasoning_meta: Option<ProviderReasoningReplay>

Populated only for PartKind::Reasoning parts. Carries opaque provider replay metadata so the adapter can re-emit the exact same reasoning item on subsequent turns. #[serde(default, skip_serializing_if)] so older snapshots that predate this field round-trip unchanged.

response_meta: Option<ResponseTextMeta>

Provider message metadata for assistant text parts. Legacy snapshots omit it; adapters synthesize deterministic ids when replaying older assistant text.

Implementations

impl Part

pub fn prompt_char_count(&self) -> usize

Trait Implementations

impl Clone for Part

fn clone(&self) -> Part

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Part

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Part

fn deserialize<__D>( __deserializer: __D, ) -> Result<Part, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Part

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

where __S: Serializer,

Serialize this value into the given Serde serializer.