## Why `Turn.items` currently overloads an empty array to mean either that no items exist or that the server intentionally did not load them for this response. That ambiguity blocks future lazy-loading work where clients need to distinguish unloaded, summary, and fully hydrated turn payloads. ## What changed - add a new `TurnItemsView` enum with `notLoaded`, `summary`, and `full` variants - add required `itemsView` metadata to app-server `Turn` payloads - mark reconstructed persisted history as `full` and live shell-style turn payloads as `notLoaded` - keep current `thread/turns/list` behavior unchanged and document that it still returns `full` turns today - regenerate the JSON and TypeScript protocol fixtures ## Verification - `just write-app-server-schema` - `cargo test -p codex-app-server-protocol` - `cargo test -p codex-app-server thread_read_can_include_turns` - `cargo test -p codex-app-server thread_turns_list_can_page_backward_and_forward` - `cargo test -p codex-app-server thread_resume_rejects_history_when_thread_is_running` - `just fix -p codex-app-server-protocol` - `just fix -p codex-app-server` - `just fmt`
codex-app-server-client
Shared in-process app-server client used by conversational CLI surfaces:
codex-execcodex-tui
Purpose
This crate centralizes startup and lifecycle management for an in-process
codex-app-server runtime, so CLI clients do not need to duplicate:
- app-server bootstrap and initialize handshake
- in-memory request/event transport wiring
- lifecycle orchestration around caller-provided startup identity
- graceful shutdown behavior
Startup identity
Callers pass both the app-server SessionSource and the initialize
client_info.name explicitly when starting the facade.
That keeps thread metadata (for example in thread/list and thread/read)
aligned with the originating runtime without baking TUI/exec-specific policy
into the shared client layer.
Transport model
The in-process path uses typed channels:
- client -> server:
ClientRequest/ClientNotification - server -> client:
InProcessServerEventServerRequestServerNotificationLegacyNotification
JSON serialization is still used at external transport boundaries (stdio/websocket), but the in-process hot path is typed.
Typed requests still receive app-server responses through the JSON-RPC result envelope internally. That is intentional: the in-process path is meant to preserve app-server semantics while removing the process boundary, not to introduce a second response contract.
Bootstrap behavior
The client facade starts an already-initialized in-process runtime, but thread bootstrap still follows normal app-server flow:
- caller sends
thread/startorthread/resume - app-server returns the immediate typed response
- richer session metadata may arrive later as a
SessionConfiguredlegacy event
Surfaces such as TUI and exec may therefore need a short bootstrap phase where they reconcile startup response data with later events.
Backpressure and shutdown
- Queues are bounded and use
DEFAULT_IN_PROCESS_CHANNEL_CAPACITYby default. - Full queues return explicit overload behavior instead of unbounded growth.
shutdown()performs a bounded graceful shutdown and then aborts if timeout is exceeded.
If the client falls behind on event consumption, the worker emits
InProcessServerEvent::Lagged and may reject pending server requests so
approval flows do not hang indefinitely behind a saturated queue.