---
title: "Create Runtime Message"
method: POST
path: "/stages/runtime/messages"
tags: ["stages"]
---

# Create Runtime Message

`POST /stages/runtime/messages`

## Request

- Base URL: `https://studio-api.meganova.ai` (the document declares no server; this is the origin it was published from)
- URL: `https://studio-api.meganova.ai/stages/runtime/messages`
- Auth: OAuth 2
  - Password
  - Token URL: `auth/token`

A stage system message: shown in the chat, never sent to the model.

## Request body

- StageSystemMessageCreate
  - `chat_session_id` string, uuid, required
  - `install_id` string, uuid, required
  - `content` string, required

## Response `201`

Successful Response

- Message
  - `role` string, required
  - `content` string, required
  - `id` string, uuid, required
  - `chat_id` string, uuid, required
  - `timestamp` string, date-time, required
  - `edited` boolean
  - `edited_at` string, date-time, nullable
  - `prev_id` string, uuid, nullable
  - `option` boolean, nullable
  - `stage_install_id` string, uuid, nullable

## Other responses

- `422`: Validation Error

## Changes

- **2026-10-16** `c683584f6060`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/meganova/apis/fastapi/changes/stages/runtime/messages/post.md)

---

[API](https://skmtc.dev/meganova/apis/fastapi.md) - [All operations](https://skmtc.dev/meganova/apis/fastapi/llms.txt) - [OpenAPI document](https://skmtc.dev/meganova/apis/fastapi/revisions/c683584f6060?raw)