---
title: "Create Conversation"
method: POST
path: "/api/conversations"
tags: ["conversations"]
---

# Create Conversation

`POST /api/conversations`

## Request body

- ConversationCreate
  - `title` string
  - `mode` 'react' | 'dag' | 'auto'
  - `agent_id` string, nullable
  - `model_name` string, nullable

## Response `200`

Successful Response

- ApiResponse
  - `success` boolean
  - `data` unknown
  - `error` string, nullable

## Other responses

- `422` — Validation Error

## Changes

- **2026-03-22** `6dc2d6f33d44` — 5 breaking, 10 info
  - the request property `agent_id` became not nullable
  - the request property `model_name` became not nullable
  - the response property `data` became optional for the status `200`
  - the response property `success` became optional for the status `200`
  - …11 more

[Change history](https://skmtc.dev/fim-ai/apis/fim-one-api/changes/api/conversations/post.md)

---

[API](https://skmtc.dev/fim-ai/apis/fim-one-api.md) · [All operations](https://skmtc.dev/fim-ai/apis/fim-one-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/fim-ai/fim-one-api/revisions/89738ff55831/schema)