Struct Llama2Template 

pub struct Llama2Template;

Llama 2 chat template.

<s>[INST] <<SYS>>
{system}
<</SYS>>

{user} [/INST] {assistant} </s><s>[INST] {user_2} [/INST]

Like Mistral, Llama 2 has no system role - the system prompt lives in a <<SYS>> block inside the first instruction - so format() is implemented directly while the per-message hooks are token-representative.

Trait Implementations

impl ChatTemplate for Llama2Template

fn name(&self) -> &str

Template identifier (e.g., “chatml”, “llama3”, “mistral”).

fn format( &self, system_prompt: &str, messages: &[Message], tools: &[ToolSchema], ) -> String

Format a complete prompt from system prompt, messages, and tools.

fn format_system(&self, system_prompt: &str, tools: &[ToolSchema]) -> String

Format the system block (system prompt + tool definitions).

fn format_message(&self, message: &Message) -> String

Wrap a single conversation message in template markers. Returns empty string for system messages (handled by format_system).

fn assistant_prefix(&self) -> &str

The string appended after all messages to open the assistant’s turn.