Struct BlockMeta 

pub struct BlockMeta {
    pub kind: BlockKind,
    pub byte_len: u64,
}

One block within a message: kind + size only.

Fields

kind: BlockKind

byte_len: u64

Size of the block as sent. The unit depends on the message’s content shape (the Anthropic builder, trace::anthropic::message_meta):

• string content: one synthetic text block whose byte_len is the RAW UTF-8 length of the string, with no JSON framing;
• array content: per block, the length of the block’s compact JSON serialization, INCLUDING {"type":"text","text":…} framing and any cache_control marker (a 1h marker adds the 48 bytes of ,"cache_control":{"type":"ephemeral","ttl":"1h"}).

So the same user text measures differently on the request where it is the newest message (coerced to blocks and marked) and on later requests (bare string history). For example, "yo, start steam in bg " is 22 as history and 95 as the marked tail block (47 for the framed block plus 48 for the marker). That is not decoration. Compare sizes only within one content shape.

Trait Implementations

impl Clone for BlockMeta

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BlockMeta

impl Debug for BlockMeta

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for BlockMeta

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for BlockMeta

impl PartialEq for BlockMeta

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for BlockMeta

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for BlockMeta