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## What changed Add experimental `thread/start.daybreakEnabled` so clients can set the initial preference for persistent threads. Omitted or null values leave it unset; explicit values are rejected for ephemeral threads. Return the choice in the start response, `thread/started`, and reads before persistence. Stage it with the initial thread metadata and save it when the thread is persisted. Later changes still use `thread/metadata/update`. The preference does not select `turn/start.cyberAccessProgram` or grant access. ## Testing Add coverage for true, false, and unset values in responses, notifications, reads, and reads after persistence and restart, plus rejection for ephemeral threads. Update existing metadata and access-program tests to exercise threads with an initial preference. GitOrigin-RevId: 3bff3dc55a18436067bc2a3f156f5abf52d7321b
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.