Struct UserRecordSink 

pub(super) struct UserRecordSink {
    broker: Option<Arc<Broker>>,
    block_id: String,
    filestore: Option<Arc<FileStore>>,
    mstore: Option<Arc<Store>>,
}

Writes the user’s message to the transcript, as the record the persistent Claude controller writes for each stdin line (Phase 5a-3c): a {"type":"user","message":{...}} line in the block’s file and the agent’s global zone, published as an echo: "stdin" event — the pane already shows the message (its agent-message-accepted node), so the event only keeps its stream gap-free. Without it these CLIs’ transcripts hold no trace of what the user sent: gone on reload, absent from History, and a turn the live feed can’t roll off (SPEC_AGENT_PANE_BOUNDED_LIVE_WINDOW_MIGRATION_2026_09_23.md §6.9).

Written only AFTER the prompt was delivered — the stdin write succeeded, or the container exec started — like the persistent controller’s delivery-before-persistence order: a failed spawn, pipe or exec must not leave the transcript claiming a turn that never happened (Codex review). Only for output formats whose CLI doesn’t echo the prompt itself (see persists_user_record).

Fields

broker: Option<Arc<Broker>>

block_id: String

filestore: Option<Arc<FileStore>>

mstore: Option<Arc<Store>>

Implementations

impl UserRecordSink

pub(super) fn write(&self, message: &str)