---
title: "04.28.2026 Session Notes API"
description: "Add session notes through a dedicated REST endpoint and reserve the note annotation name for session note APIs."
---

## Session Notes API

**Available in arize-phoenix 14.16.0+**

Phoenix now supports creating session notes through `POST /v1/session_notes`, giving session-level review workflows the same note-specific REST pattern used by traces and spans.

To keep note behavior consistent across APIs, the reserved annotation name `note` is no longer accepted on the generic session annotation endpoint. Use the dedicated note endpoint instead:

- `POST /v1/session_notes` for session notes
- `POST /v1/session_annotations` for regular session annotations
