---
title: "Replies to a message in a Slack thread."
method: POST
path: "/replyMessage"
tags: ["message"]
---

# Replies to a message in a Slack thread.

`POST /replyMessage`

Replies to an existing message in a Slack thread.

## Request body

- object
  - `body` object — Body of the replyMessage sls call
    - `arguments` object, required
      - `channelId` string, required — The ID of the channel where the message is. Channel IDs start with 'C'.
      - `thread_ts` string, required — The timestamp of the message to reply to, which establishes the thread.
      - `text` string, required — The text of the reply.
      - `username` string — Optional custom username for the message.
      - `icon_url` string — Optional URL to an image to use as the icon for the message.

## Response `200`

Successful response

- object
  - `ok` boolean, required — true if the request was successful.
  - `channel` string, required — The ID of the channel where the message was posted.
  - `ts` string, required — The timestamp of the message.
  - `message` object, required — An object containing the details of the sent message.

## Other responses

- `400` — Bad Request - The request was invalid or cannot be served.
- `500` — Internal Server Error - The server encountered an unexpected condition that prevented it from fulfilling the request.

---

[API](https://skmtc.net/microfox-ai/apis/slack-d.md) · [All operations](https://skmtc.net/microfox-ai/apis/slack-d/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/microfox-ai/slack-d/versions/cd0edf0c2cdf/schema)