---
title: "Update Presence"
method: POST
path: "/chat-sessions/{chat_session_id}/collaboration"
tags: ["runtime_mutations"]
---

# Update Presence

`POST /chat-sessions/{chat_session_id}/collaboration`

## Path parameters

- `chat_session_id` string, required

## Request body

- PresenceChange
  - `message_id` string, nullable
  - `typing` boolean, nullable

## Response `200`

Successful Response

- unknown

## Other responses

- `422` — Validation Error

## Changes

- **2026-09-18** `abf76937a751` — 2 info
  - added the optional property `detail/items/ctx` to the response with the `422` status
  - added the optional property `detail/items/input` to the response with the `422` status
- **2026-09-15** `21910d3ae5d8` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/quadrillion/apis/quadrillion-cloud-api/changes/chat-sessions/:chat_session_id/collaboration/post.md)

---

[API](https://skmtc.dev/quadrillion/apis/quadrillion-cloud-api.md) · [All operations](https://skmtc.dev/quadrillion/apis/quadrillion-cloud-api/llms.txt) · [OpenAPI document](https://skmtc.dev/quadrillion/apis/quadrillion-cloud-api/revisions/d7f2f3b8e82d?raw)