---
title: "Start Conversation"
method: POST
path: "/api/chats/start"
tags: ["chats"]
---

# Start Conversation

`POST /api/chats/start`

## Request

- Base URL: `https://app.thinqos.com` (the document declares no server; this is the origin it was published from)
- URL: `https://app.thinqos.com/api/chats/start`
- Auth: none declared

Start a NEW message-first conversation with these parties (TOS-4104).

The New chat screen's chat action. Always creates; never reopens an
existing thread, which is the reported bug this endpoint exists to fix.
Accepts any number of other parties, so a group conversation is one write
rather than a create followed by an add.

Rooms do not come through here. A room is the named, empty-persisting
thing and is created by ``POST /api/rooms``; keeping the two endpoints
apart is what stops the server guessing which one the user meant.

## Headers

- `x-impersonate-identity-id` string, nullable

## Request body

- StartConversationRequest
  - `participant_identity_ids` string[], required
  - `content` string, required
  - `idempotency_key` string, uuid, required
  - `extraction_excluded` boolean

## Response `200`

Successful Response

- StartConversationResponse
  - `id` string, uuid, required
  - `title` string, nullable, required
  - `container_kind` string, required
  - `description` string, nullable
  - `first_message_id` string, uuid, required
  - `first_response_run_id` string, uuid, nullable

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/thinqos/apis/thinqos-api.md) · [All operations](https://skmtc.dev/thinqos/apis/thinqos-api/llms.txt) · [OpenAPI document](https://skmtc.dev/thinqos/apis/thinqos-api/revisions/ce2c2ce318b1?raw)