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## Why `session_id` and `thread_id` are separate identities after #20437, but app-server only surfaced `sessionId` on the `thread/start`, `thread/resume`, and `thread/fork` response envelopes. Other thread-bearing surfaces such as `thread/list`, `thread/read`, `thread/started`, `thread/rollback`, `thread/metadata/update`, and `thread/unarchive` either lacked the grouping key or forced clients to special-case those three responses. Making `sessionId` part of the reusable `Thread` payload gives every v2 API surface one place to expose session-tree identity. ## Mental model 1. thread.sessionId lives on `Thread` 2. It is a view/runtime identity for the current live session tree, not durable stored lineage metadata 3. When app-server has a live loaded thread, it copies the real value from core’s session_configured.session_id 4. When it only has stored/unloaded data, it falls back to thread.sessionId = thread.id ## What changed - Added `sessionId` to the v2 [`Thread`](8fc9e9b4cf/codex-rs/app-server-protocol/src/protocol/v2/thread_data.rs (L105-L109)). - Removed the duplicate top-level `sessionId` fields from `thread/start`, `thread/resume`, and `thread/fork`; clients should now read `response.thread.sessionId`. - Populated `thread.sessionId` when building live thread responses, replaying loaded threads, and returning stored-thread summaries so the field is present across start, resume, fork, list, read, rollback, metadata-update, unarchive, and `thread/started` paths. See [`load_thread_from_resume_source_or_send_internal`](8fc9e9b4cf/codex-rs/app-server/src/request_processors/thread_processor.rs (L2824-L2918)) and [`thread_from_stored_thread`](8fc9e9b4cf/codex-rs/app-server/src/request_processors/thread_processor.rs (L3671-L3719)). - Preserved the stored-thread fallback: if a thread has not been loaded into a live session tree yet, `thread.sessionId` falls back to `thread.id`; once the thread is live again, the field reports the active session tree root. - Regenerated the JSON/TypeScript schemas and updated the app-server README examples to show [`thread.sessionId`](8fc9e9b4cf/codex-rs/app-server/README.md (L306-L310)) on the thread object.