---
title: "Create Message Route"
method: POST
path: "/api/threads/{thread_id}/messages/"
tags: ["message"]
---

# Create Message Route

`POST /api/threads/{thread_id}/messages/`

Creates a new message.

## Path parameters

- `thread_id` string, uuid, required

## Request body

- MessageCreateInput
  - `role` 'user' | 'assistant', required
  - `content` string, required
  - `metadata` MessageMetadata, required
    - `trustworthiness_score` number, nullable

## Response `201`

Successful Response

- Message
  - `thread_id` string, uuid, required
  - `role` 'user' | 'assistant', required
  - `content` string, required
  - `metadata` MessageMetadata, required
    - `trustworthiness_score` number, nullable
  - `id` string, uuid, required
  - `created_at` string, date-time, required
  - `updated_at` string, date-time, required
  - `deleted_at` string, date-time, nullable

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.dev/cleanlab/apis/agility.md) · [All operations](https://skmtc.dev/cleanlab/apis/agility/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/cleanlab/agility/revisions/c3d745f0888a/schema)