Post a reply to an existing space comment

Creates a reply to an existing comment on a space. Use this to continue a discussion thread started by a top-level comment. To start a new thread, use the space comment creation endpoint instead.

Available in MCP

post

Authorizations

AuthorizationstringRequired

Bearer authentication header of the form Bearer <token>.

Path parameters

spaceIdstringRequired

A unique entity identifier

Pattern: ^[a-zA-Z0-9_-]+$

commentIdstringRequired

A unique entity identifier

Pattern: ^[a-zA-Z0-9_-]+$

Body

bodyone ofRequired

The content of the comment.

or

or

object · EmptyOptional

Responses

200

The reply was posted.

application/json

objectstring · enumRequired

Type of Object, always equals to "comment-reply"

Possible values:

idstringRequired

Unique identifier for the reply.

postedAtstring · date-timeRequired

editedAtstring · date-timeOptional

Date when the reply was edited, if it has been edited.

bodyone ofRequired

or

or

object · EmptyOptional

post/spaces/{spaceId}/comments/{commentId}/replies

POST /v1/spaces/{spaceId}/comments/{commentId}/replies HTTP/1.1
Host: api.gitbook.com
Authorization: Bearer YOUR_SECRET_TOKEN
Content-Type: application/json
Accept: */*
Content-Length: 113

{
  "body": {
    "markdown": "# Hello World\n\nThis is a markdown document linking to [another page](/pages/page_id).\n"
  }
}

200

The reply was posted.

{
  "object": "comment-reply",
  "id": "text",
  "postedBy": {
    "object": "user",
    "id": "text",
    "displayName": "text",
    "email": "text",
    "photoURL": "text",
    "urls": {
      "location": "https://example.com"
    }
  },
  "postedAt": "2026-01-01T00:00:00.000Z",
  "editedAt": "2026-01-01T00:00:00.000Z",
  "reactions": [
    {
      "emoji": "text",
      "count": 1,
      "users": [
        {
          "user": {
            "object": "user",
            "id": "text",
            "displayName": "text",
            "email": "text",
            "photoURL": "text",
            "urls": {
              "location": "https://example.com"
            }
          },
          "reactedAt": "2026-01-01T00:00:00.000Z"
        }
      ]
    }
  ],
  "body": {
    "markdown": "# Hello World\n\nThis is a markdown document linking to [another page](/pages/page_id).\n"
  },
  "urls": {
    "location": "https://example.com"
  },
  "permissions": {
    "view": true,
    "edit": true,
    "reply": true,
    "delete": true
  }
}