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## What changed - Add an optional `delivery` field to agent message events and app-server `agentMessage` items, with `"async"` identifying a user-visible message sent without ending the current turn. - Preserve the marker through legacy event conversion, thread history materialization, replay, and generated JSON and TypeScript schemas. - Require delivery of async agent message completion notifications on the in-process app-server transport. ## Testing - Cover preservation of async delivery metadata in thread history. - Cover delivery-required classification for async agent messages. GitOrigin-RevId: f92ba25de1293ee271404badfdf0d117d6530329
Thread Store
codex-thread-store is the storage boundary for Codex threads. It defines the
ThreadStore trait plus local and in-memory implementations. Other storage
implementations may live outside this repository.
Responsibilities
ThreadStore::append_itemsis the raw canonical history append API. It does not infer metadata from item contents.ThreadStore::update_thread_metadatais the only thread metadata write API. It accepts a single literal metadata patch shape, regardless of whether the caller is applying a user/API mutation or facts derived above the store from appended history.LiveThreadis the preferred API for active session persistence. It owns a per-thread metadata sync helper, applies the rollout persistence policy, appends canonical history, and then sends metadata patches throughThreadStore::update_thread_metadata.ThreadManagerroutes metadata mutations for loaded and cold threads through one entrypoint. Loaded threads use theirLiveThread; cold threads go directly to the store.LocalThreadStorepersists history throughcodex-rolloutJSONL files and persists queryable metadata through the SQLite state database when available. Local explicit metadata mutations also maintain JSONL/name-index compatibility so reading old or SQLite-less local storage keeps working.RolloutRecorderis the local JSONL writer. It writes already-canonical items forThreadStore::append_items; it no longer decides metadata updates for live thread-store appends.core/sessioncreates or resumesLiveThreadhandles and does not need to know whether persistence is backed by local files or another store.
Direction
New metadata observation semantics should live above ThreadStore. Stores
persist explicit metadata fields, but raw history appends remain history-only.