codex/codex-rs/core/src/session_prefix.rs

use codex_protocol::protocol::AgentStatus;

use crate::context::ContextualUserFragment;
use crate::context::SubagentNotification;

// Helpers for model-visible session state markers that are stored in user-role
// messages but are not user intent.

// TODO(jif) unify with structured schema
pub(crate) fn format_subagent_notification_message(
    agent_reference: &str,
    status: &AgentStatus,
) -> String {
    SubagentNotification::new(agent_reference, status.clone()).render()
}

pub(crate) fn format_subagent_context_line(
    agent_reference: &str,
    agent_nickname: Option<&str>,
) -> String {
    match agent_nickname.filter(|nickname| !nickname.is_empty()) {
        Some(agent_nickname) => format!("- {agent_reference}: {agent_nickname}"),
        None => format!("- {agent_reference}"),
    }
}