---
title: "POST /v1/threads/{threadId}/messages/{messageId}"
method: POST
path: "/v1/threads/{threadId}/messages/{messageId}"
---

# POST /v1/threads/{threadId}/messages/{messageId}

`POST /v1/threads/{threadId}/messages/{messageId}`

## Path parameters

- `threadId` string, uuid, required

## Request body

- object
  - `content` string
  - `metadata` object

## Response `200`

Langbase: Update thread messages v1

- object
  - `id` string, uuid, required
  - `created_at` number, required
  - `thread_id` string, uuid, required
  - `content` string
  - `role` 'system' | 'user' | 'assistant' | 'function' | 'tool', required
  - `tool_call_id` string, nullable
  - `tool_calls` unknown[]
    - unknown
  - `name` string, nullable
  - `attachments` unknown[]
    - unknown
  - `metadata` object

## Other responses

- `400` — Bad Request
- `500` — Internal Server Error

---

[API](https://skmtc.net/langbase/apis/langbase-api.md) · [All operations](https://skmtc.net/langbase/apis/langbase-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/langbase/langbase-api/versions/a8ae3cd9597e/schema)