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## What changed
Allow `cursor` to accept an item anchor such as `{"type":"item","itemId":"item-123"}` with a non-empty `turnId`. Ascending pagination returns items after the anchor; descending pagination returns items before it. The anchor itself is excluded, and subsequent pages use the returned opaque string cursor.
Resolve anchors within the requested turn's visible history, including inherited fork history. Reject missing turn IDs and empty, unknown, or out-of-scope item IDs with invalid params (`-32602`). Preserve existing string and null cursor behavior, and update the protocol schemas, TypeScript and Python types, and API documentation.
## Testing
Add protocol round-trip and invalid-shape tests, app-server coverage for anchored pagination and errors, and thread-store coverage for growing turns, reverse pagination, page boundaries, fork visibility, and anchor scope validation.
GitOrigin-RevId: a74cea190d3ff1b44865429f8b0650b793eb688d
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.