---
title: "Changes to Append Messages"
method: POST
path: "/mle-agent/sessions/{session_id}/messages"
---

# Changes to Append Messages

`POST /mle-agent/sessions/{session_id}/messages`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 1 of 3 revisions.

- **2026-08-19** `b92f75fd3b61` — 1 breaking

## Changes

- **2026-08-19** `b92f75fd3b61` — 1 breaking
  - for the `path` request parameter `session_id`, the format changed from no format to `uuid`

---

[Operation](https://skmtc.dev/pioneer/apis/brain-api/docs/mle-agent/sessions/:session_id/messages/post.md) · [API](https://skmtc.dev/pioneer/apis/brain-api.md) · [Page](https://skmtc.dev/pioneer/apis/brain-api/changes/mle-agent/sessions/:session_id/messages/post)