---
title: "Edit and resend"
method: POST
path: "/api/apps/{app_id}/chat/edit-and-resend"
---

# Edit and resend

`POST /api/apps/{app_id}/chat/edit-and-resend`

<Info>This API is in beta. Endpoints, fields, and behavior may still change, so avoid depending on it in production.</Info>

Replaces an earlier user message and rebuilds from there. Base44 rolls the app back to just before that message, then runs your new one in its place.

Use it to reword a request that took the AI in the wrong direction, instead of piling a correction on top. Everything the AI did from `message_id` onwards is undone first, so those changes are gone. To keep them, send a new message with [Send chat message](/api-reference/send-chat-message) instead.

The request stays open until the new turn settles, so it can take several minutes. It consumes credits like any other turn.

Set an `X-Request-ID` header before you send. A network [retry](/developers/references/app-management/get-started/retries) carrying the same value is ignored rather than run a second time and charged again.

A `200` response does not mean the turn succeeded. Two cases come back as a `200`.

- **The turn ran and finished.** `status.state` is `ready` and the app is idle again.
- **The turn ran and failed.** `status.state` is `error`, and `status.error_source` says where it failed. A value of `paywall` means the app's workspace has no credits left.

<Warning>The response includes fields beyond the ones documented here. Don't rely on undocumented response fields, as they can change at any time. Send only the fields documented here. Other request fields are not supported and their behavior can change.</Warning>

## Path parameters

- `app_id` string, required — ID of the app whose AI chat this request acts on.

## Request body

- object
  - `message_id` string, required — ID of the message you are replacing. Everything from this message onwards is undone before the new one is sent.
  - `content` string, required — What to send instead. Up to 100,000 characters.
  - `file_urls` string[] — Publicly reachable URLs of files to attach to the new message. Base44 downloads each file, so a URL has to resolve without credentials.

## Response `200`

Successful Response

- ChatTurnResponse — An app, with its conversation and build status.
  - `id` string, nullable — ID of the app.
  - `name` string, nullable — Display name of the app.
  - `status` AppStatusResponse — The app's current build status.
    - `state` 'ready' | 'processing' | 'error', required — Where the app is in its build lifecycle. Ready means idle with no build in progress, processing means the app is being generated or modified, and error means the last build failed. This tracks building, not publishing.
    - `details` string, nullable — Human readable note about the current state, such as what is being processed or why it failed, or `null` when there is nothing to report.
    - `request_id` string, nullable — ID of the request that last changed the status, or `null` if the status has never changed. Useful when reporting an issue.
    - `last_updated_date` string, date-time, nullable — Time the status was last updated, as a UTC timestamp in ISO 8601 format.
    - `error_source` string, nullable — Where the failure originated when `state` is `error`, or `null` otherwise. A value of `paywall` means the work was blocked because the app's workspace has no credits left.
    - `paywall_context` PaywallStatusContextResponse
      - `billing_organization_id` string, required — ID of the billing organization the paywall was evaluated against.
      - `user_id` string, required — ID of the user the paywall was evaluated for.
      - `evaluated_at` string, date-time, required — Time the paywall condition was evaluated, as a UTC timestamp in ISO 8601 format.
  - `conversation` ChatTurnConversation
    - `id` string, nullable — ID of the conversation.
    - `messages` ConversationMessageSummary[], nullable — The conversation's messages once the request finished, oldest first.
      - `id` string, nullable — ID of the message.
      - `role` 'user' | 'assistant' | 'system', nullable — Who produced the message. A `user` message is a prompt sent to the AI, an `assistant` message is the AI's reply, and a `system` message is a platform-generated note.
      - `content` string, nullable — Text of the message. Empty on assistant turns whose work is carried entirely by tool calls, and on internal diff messages.
      - `file_urls` string[], nullable — URLs of the files attached to the message, or `null` if it has none.
      - `hidden` boolean, nullable — Whether the message is internal and hidden from the chat in the app editor.
      - `checkpoint_id` string, nullable — ID of the [checkpoint](/developers/references/app-management/get-started/concepts#checkpoints) this message produced, or `null` if it produced none. Pass it as `checkpoint_id` to [Deploy an app](/api-reference/deploy-an-app) to deploy that version.
      - `tool_calls` ConversationToolCallSummary[], nullable — Tool calls the AI made on this message, or `null` on messages that made none. A call with `status` set to `waiting_for_user_input` is holding the turn open until it is answered.
        - `id` string, nullable — ID of the tool call. Pass it as `tool_call_id` to [Submit tool-call input](/api-reference/submit-tool-call-input) when `status` is `waiting_for_user_input`.
        - `name` string, nullable — Name of the tool the AI is calling.
        - `status` 'running' | 'success' | 'error' | 'stopped' | 'waiting_for_user_input', nullable — Where the tool call is. Either `running`, `success`, `error`, `stopped`, or `waiting_for_user_input`. The last one means the turn is paused until the call is answered.
        - `requires_user_input` boolean, nullable — Whether this tool call has to be approved or rejected before the turn can continue.
      - `usage` MessageUsageSummary
        - `prompt_tokens` integer, nullable — Tokens the model read for this message, including the conversation history it was given.
        - `completion_tokens` integer, nullable — Tokens the model generated for this message.
        - `credits_charged` number, nullable — Credits charged for this message, or `null` if it was not billed.
      - `metadata` MessageMetadataSummary
        - `created_date` string, date-time, nullable — Time the message was created, as a UTC timestamp in ISO 8601 format.
        - `created_by_email` string, nullable — Email of the user whose turn produced the message, or `anonymous` on a message Base44 created with no user in context.

## Other responses

- `400` — The `content` field is longer than 100,000 characters, or the message has no checkpoint to roll back to.
- `401` — Missing or invalid credentials.
- `403` — You don't have access to this app.
- `404` — App, message, or checkpoint not found.
- `409` — The app is busy with another operation that blocks the rollback, or the request is scoped to a feature branch. A rollback restores a checkpoint, which is app-wide, so it can only run on the main branch.
- `422` — The request body is missing `message_id` or `content`, or one of its fields has the wrong type.
- `503` — The server is shutting down, or the app's queue could not be paused for the edit. Retry the request.

## Changes

- **2026-08-30** `394136a6cdd4` — 1 breaking, 1 info
  - removed the media type `application/json` for the response with the status `422`
  - added the non-success response with the status `503`
- **2026-08-24** `a58b38664ce9` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/idealspot/apis/base44-app-management-api/changes/api/apps/:app_id/chat/edit-and-resend/post.md)

---

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