---
title: "Send Marketing Agent message"
method: POST
path: "/api/apps/{app_id}/cmo/messages"
---

# Send Marketing Agent message

`POST /api/apps/{app_id}/cmo/messages`

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

Sends a message to the app's Marketing Agent and starts the turn that answers it. During setup the message answers or revises the step the agent is on. After setup it's an ordinary conversation about the app's marketing.

A message sent before setup has started opens it, the same way [Start Marketing Agent setup](/api-reference/start-marketing-agent-setup) does.

The work runs in the background after the call returns. Poll [Get Marketing Agent state](/api-reference/get-marketing-agent-state) until `status` is `ready` or `error`. If `competitor_scan_status` is `running`, keep polling until it is no longer `running`. The reply appears in the app's chat, which you read with [Read conversation messages](/api-reference/read-conversation-messages).

The agent takes one turn at a time, so a message sent while it's working is rejected. Send it again once `status` is `ready` or `error`. If writing the strategy failed partway, a message starts writing it again and is itself rejected until that finishes.

Set `message_id` to a UUID of your own, or send an `Idempotency-Key` header instead. A retry that carries the same `message_id` or key returns the current state without starting or charging a second turn.

Each run is a Superagent turn, charged to the app's workspace in message credits based on the tokens it uses. A run can take several minutes and is stopped after 15. If the workspace is out of credits the run doesn't start, and `last_error` says so.

This is limited to 120 requests a minute per app for each workspace's personal API keys, so every key in a workspace shares one allowance, across every Marketing Agent endpoint. Some workspaces have a different limit.

<Note>This endpoint accepts a personal API key belonging to a user with editor access to the app and an editor role in its workspace. Read-only keys and workspace API keys are refused.</Note>

<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.

## Headers

- `Idempotency-Key` string, nullable — Your key for this message, as an alternative to `message_id`. A retry with the same key doesn't start a second turn. Ignored when the body carries `message_id`.

## Request body

- SendMessagePayload
  - `message_id` string, uuid — Your ID for the message. A retry with the same ID doesn't start a second turn. Defaults to a new UUID.
  - `content` string, required — The message to the Marketing Agent. Up to 20,000 characters.

## Response `200`

Successful Response

- MarketingAgentStateResponse — The Marketing Agent's plan for an app and the state of its latest run.
  - `status` 'idle' | 'provisioning' | 'analyzing' | 'ready' | 'error', required — State of the latest run. Either `"idle"` before any run, `"provisioning"` while the workspace's Marketing Agent is created, `"analyzing"` while a run is working, `"ready"` once it finished, or `"error"` if it failed. A run that stops reporting for 15 minutes reads as `"error"`.
  - `run_id` string, nullable, required — ID of the latest run, or `null` if no run has started. Compare it between polls to tell a new run from the one you started.
  - `last_error` string, nullable, required — Why the latest run failed, or `null` if it didn't.
  - `setup_stage` 'not_started' | 'scanning' | 'channels' | 'kpis' | 'budget' | 'generating' | 'complete', required — How far setup has got. Either `"not_started"`, `"scanning"`, `"channels"`, `"kpis"`, `"budget"`, `"generating"`, or `"complete"`. At `channels`, `kpis`, and `budget` the agent is waiting for an answer.
  - `reset_epoch` integer, required — Number of times the plan was reset. Send it back as `reset_epoch` when you answer a setup step.
  - `channels` MarketingChannel[], required — The marketing channels the agent proposed. Empty until the opening scan finishes.
    - `name` string, required — Name of the channel.
    - `why` string, required — Why this channel fits the app.
    - `tactics` string[], required — Concrete tactics for the channel. Up to 3.
    - `priority` integer, nullable — How much to invest in this channel, from `1` to `5`, where `5` means invest here first. Omitted when the agent didn't rank it.
  - `channels_revision_suggestion` string, nullable, required — A change to the channels the agent offers to make, or `null` if it offers none. Send it as a message to accept it.
  - `kpis` MarketingKpi[], required — The KPIs the agent proposed. Empty until the opening scan finishes.
    - `name` string, required — The KPI in one measurable line.
    - `why` string, required — Why this KPI matters for the app.
    - `baseline` string, nullable — Current value, when the agent could tell it from the app. Omitted otherwise.
    - `target` string, nullable — Target at the recommended budget, with a time horizon.
    - `targets` object, nullable — The target at each budget band, keyed by `none`, `low`, `mid`, and `high`. A band that's missing means spend at that level can't move this KPI.
    - `target_values` object, nullable — The number inside each band's target, keyed like `targets`.
    - `metric` KpiMetric
      - `template` 'event_count' | 'unique_sessions' | 'unique_users' | 'retention_dn', required — How the KPI is counted. Either `"event_count"`, `"unique_sessions"`, `"unique_users"`, or `"retention_dn"`.
      - `event_name` string, required — Analytics event the KPI is measured against.
      - `window_days` integer, nullable — Number of days the value is counted over. Either `7` or `30`.
      - `n` integer, nullable — Day the return is measured at, for a `retention_dn` KPI only.
    - `instrument` KpiInstrument
      - `builder_prompt` string, required — Prompt for the app builder that adds the missing analytics event. Present only while the app doesn't record `metric.event_name` yet.
      - `where` string, nullable — Where in the app's code the outcome already happens. Omitted when the agent didn't find it.
      - `requested_at` string, nullable — When the build that adds the event was requested, as an ISO 8601 timestamp, or `null` if it hasn't been.
  - `kpis_revision_suggestion` string, nullable, required — A change to the KPIs the agent offers to make, or `null` if it offers none. Send it as a message to accept it.
  - `strategy` MarketingStrategy, required
    - `summary` string, required — The strategy in up to 2 sentences.
    - `positioning` string, nullable — How the app is positioned against its competitors.
    - `channel_plan` MarketingChannel[], required — The channels the strategy invests in.
      - `name` string, required — Name of the channel.
      - `why` string, required — Why this channel fits the app.
      - `tactics` string[], required — Concrete tactics for the channel. Up to 3.
      - `priority` integer, nullable — How much to invest in this channel, from `1` to `5`, where `5` means invest here first. Omitted when the agent didn't rank it.
    - `key_metrics` string[], required — The metrics the strategy is judged by.
    - `budget_fit` string, nullable — How the strategy fits the workspace's stated budget.
  - `suggestions` MarketingSuggestion[], required — Growth ideas the agent generated for the app.
    - `id` string, required — ID of the suggestion.
    - `title` string, required — Short title of the growth idea.
    - `builder_prompt` string, required — Prompt to send to the app builder to build the idea.
    - `category` string, nullable — Kind of growth idea.
    - `rationale` string, nullable — Why the idea should help.
    - `impact` string, nullable — Expected impact. Either `"high"`, `"medium"`, or `"low"`.
    - `effort` string, nullable — Rough build effort. Either `"low"`, `"medium"`, or `"high"`.
    - `dismissed` boolean, nullable — Whether someone dismissed the suggestion.
  - `budget` MarketingBudget, required
    - `description` string, required — The budget as it was stated.
    - `band` 'none' | 'low' | 'mid' | 'high', nullable — Budget band that selects each KPI's target. Either `"none"`, `"low"`, `"mid"`, or `"high"`. Omitted when the budget was stated in free text.
  - `competitor_research_opt_in` boolean, required — Whether competitor research runs alongside the strategy.
  - `competitor_research_answer` boolean, nullable, required — Whether competitor research was accepted (`true`) or declined (`false`), or `null` if the question wasn't answered yet.
  - `setup_paused` boolean, required — Whether setup is paused because the user asked the agent to stop. Sending a message resumes it.
  - `competitors` MarketingCompetitor[], required — Competitors found by the research, with verified URLs.
    - `name` string, required — Name of the competitor.
    - `url` string, required — URL of the competitor's site.
    - `angle` string, required — How the competitor positions itself.
    - `gap` string, required — What the competitor leaves open for this app.
  - `competitor_scan_status` 'running' | 'done' | 'failed', nullable, required — State of the competitor research. Either `"running"`, `"done"`, or `"failed"`, or `null` if it never ran.
  - `cmo_agent_app_id` string, nullable, required — ID of the workspace's Marketing Agent app your conversation runs on, or `null` if you haven't talked to it on this app yet.

## Other responses

- `400` — `content` is empty.
- `401` — Missing or invalid credentials.
- `403` — You don't have editor access to this app or an editor role in its workspace, the app is a mobile app, Superagent is turned off for the workspace, or you used a read-only or workspace API key.
- `404` — App not found.
- `409` — The agent is still working on an earlier turn, setup moved on while the message was sent, or `message_id` was already used for a different message.
- `422` — The body is malformed, `content` is longer than 20,000 characters, `message_id` isn't a UUID, or `Idempotency-Key` is longer than 100 characters.
- `429` — Rate limit exceeded.

## Changes

- **2026-09-30** `e2a6a9f1fe4c` — 1 info
  - endpoint added

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

---

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