---
title: "Create a thread reply"
method: POST
path: "/messages/{messageId}/thread"
tags: ["Messages"]
---

# Create a thread reply

`POST /messages/{messageId}/thread`

Reply inside a message's thread.

Thread replies are INTERNAL — they never reach the customer, never fire
webhooks/integrations/SLA, and never move the ticket's latest message.

## Path parameters

- `messageId` string, required

## Headers

- `project` string, required

## Request body

- CreateThreadReplyDto
  - `data` unknown
  - `attachments` AttachmentDto[]
    - `name` string, required
    - `url` string, required
    - `type` string
  - `clientMutationId` string — Client-supplied, so a retried optimistic send doesn't double-post.

## Response `200`

Ok

- unknown

---

[API](https://skmtc.net/gleap/apis/gleap-server.md) · [All operations](https://skmtc.net/gleap/apis/gleap-server/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/gleap/gleap-server/versions/6f02af3a6c47/schema)