> ## Documentation Index
> Fetch the complete documentation index at: https://docs.base44.com/llms.txt
> Use this file to discover all available pages before exploring further.
> ## Agent Instructions
> Internal links on these pages omit the .md extension. Append .md to a docs page URL, or send an Accept: text/markdown header, to get that page as markdown.
# Reply to comment
> This API is in beta. Endpoints, fields, and behavior may still change, so avoid depending on it in production.
Adds a reply to a comment thread. Replying to a resolved thread doesn't reopen it.
`mentioned_emails` records who the comment mentions. Only emails that [List mentionable users](/api-reference/list-mentionable-users) returns are kept, and the rest are dropped without an error. Mentioning someone sends them no email or notification, and responses never return the list.
Anyone with the app open in the builder sees the change right away.
This is limited to 120 requests per minute per app, shared by every other comments endpoint. A signed-in session has its own limit, and every personal access token for the workspace shares one. Some workspaces have a different limit. Every request that counts against the limit gets `X-RateLimit-Limit`, `X-RateLimit-Remaining` and `X-RateLimit-Reset` (Unix time in seconds) headers, and a `429` also gets `Retry-After` in seconds. If the limiter itself is unavailable, requests go through without these headers.
Call this as an editor of the app, with a personal access token sent as a Bearer token or from a signed-in session. Viewers in the app's workspace, read-only tokens, and workspace API keys are refused.
## OpenAPI
````yaml /developers/references/app-management/app-management-openapi.json post /api/apps/{app_id}/comments/threads/{thread_id}/replies
openapi: 3.1.0
info:
title: Base44 App Management API
version: 1.0.0
servers:
- url: https://app.base44.com
security:
- PersonalAccessTokenAuth: []
paths:
/api/apps/{app_id}/comments/threads/{thread_id}/replies:
post:
summary: Reply to comment
description: >-
This API is in beta. Endpoints, fields, and behavior may still
change, so avoid depending on it in production.
Adds a reply to a comment thread. Replying to a resolved thread doesn't
reopen it.
`mentioned_emails` records who the comment mentions. Only emails that
[List mentionable users](/api-reference/list-mentionable-users) returns
are kept, and the rest are dropped without an error. Mentioning someone
sends them no email or notification, and responses never return the
list.
Anyone with the app open in the builder sees the change right away.
This is limited to 120 requests per minute per app, shared by every
other comments endpoint. A signed-in session has its own limit, and
every personal access token for the workspace shares one. Some
workspaces have a different limit. Every request that counts against the
limit gets `X-RateLimit-Limit`, `X-RateLimit-Remaining` and
`X-RateLimit-Reset` (Unix time in seconds) headers, and a `429` also
gets `Retry-After` in seconds. If the limiter itself is unavailable,
requests go through without these headers.
Call this as an editor of the app, with a personal access token
sent as a Bearer token or from a signed-in session. Viewers in the app's
workspace, read-only tokens, and workspace API keys are refused.
operationId: >-
reply_to_app_comment_api_apps__app_id__comments_threads__thread_id__replies_post
parameters:
- name: app_id
in: path
required: true
schema:
type: string
description: ID of the app.
title: App Id
description: ID of the app.
example: 6820f3a4e7b91d003c45a1f2
- name: thread_id
in: path
required: true
schema:
type: string
description: >-
ID of the comment thread, from `thread.id` in [List
comments](/api-reference/list-comments).
title: Thread Id
description: >-
ID of the comment thread, from `thread.id` in [List
comments](/api-reference/list-comments).
example: 68e2b7c1d4f0a9001c3e5a17
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/ReplyToAppCommentPayload'
responses:
'200':
description: The new reply.
content:
application/json:
schema:
$ref: '#/components/schemas/CommentMessage'
'401':
description: Missing or invalid credentials.
'403':
description: >-
You don't have editor access to this app, you're a viewer in the
app's workspace, the app is blocked, or your token is read-only or a
workspace API key.
'404':
description: App or comment thread not found.
'409':
description: Your workspace requires an unlocked SSO session.
'422':
description: Validation Error
content:
application/json:
schema:
$ref: '#/components/schemas/HTTPValidationError'
'429':
description: >-
Rate limit exceeded. Wait the number of seconds in `Retry-After`
before retrying.
components:
schemas:
ReplyToAppCommentPayload:
properties:
content:
type: string
maxLength: 5000
minLength: 1
title: Content
description: Text of the comment, 1 to 5000 characters.
example: Done, thanks!
mentioned_emails:
items:
type: string
type: array
maxItems: 50
title: Mentioned Emails
description: >-
Emails of up to 50 people the comment mentions. Mentions send no
notification.
example:
- dana@acme.com
type: object
required:
- content
title: ReplyToAppCommentPayload
description: A reply to a comment thread.
CommentMessage:
properties:
id:
type: string
title: Id
description: ID of the comment.
example: 68e2b7c4d4f0a9001c3e5a1c
content:
type: string
title: Content
description: Text of the comment.
example: Make this button match the header color.
sender_id:
type: string
title: Sender Id
description: >-
ID of the Base44 user who wrote it, or `base44` for a reply from the
builder agent.
example: 6820f41be7b91d003c45a20a
sender_name:
type: string
title: Sender Name
description: >-
Name of the author when they wrote it, or their email when they had
no name. `Base44` for the builder agent.
example: Dana Levi
sender_avatar_url:
anyOf:
- type: string
- type: 'null'
title: Sender Avatar Url
description: URL of the author's profile image, or `null` when they have none.
example: https://lh3.googleusercontent.com/a/ACg8ocJ2
created_date:
type: string
format: date-time
title: Created Date
description: When the comment was posted, in UTC.
example: '2026-10-05T09:14:22.512000Z'
edited_at:
anyOf:
- type: string
format: date-time
- type: 'null'
title: Edited At
description: >-
When the comment was last edited, in UTC, or `null` when it never
was.
example: '2026-10-05T09:14:22.512000Z'
reactions:
additionalProperties:
items:
type: string
type: array
type: object
title: Reactions
description: >-
Each emoji reacted with, mapped to the IDs of the users who reacted
with it.
example:
👍:
- 6820f41be7b91d003c45a20a
type: object
required:
- id
- content
- sender_id
- sender_name
- sender_avatar_url
- created_date
- edited_at
- reactions
title: CommentMessage
description: 'One comment: the first comment of a thread or a reply.'
HTTPValidationError:
properties:
detail:
items:
$ref: '#/components/schemas/ValidationError'
type: array
title: Detail
type: object
title: HTTPValidationError
ValidationError:
properties:
loc:
items:
anyOf:
- type: string
- type: integer
type: array
title: Location
msg:
type: string
title: Message
type:
type: string
title: Error Type
type: object
required:
- loc
- msg
- type
title: ValidationError
securitySchemes:
PersonalAccessTokenAuth:
type: http
scheme: bearer
description: 'Personal access token, sent as `Authorization: Bearer `.'
````
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