---
title: "Steer a running cloud run – Superbot API"
canonical_url: "https://superbot.gg/developers/runs#sendRunMessage"
last_updated: "2026-10-01"
summary: "Add a note to a run that is queued or running. The run is not restarted: it reads the note at its next step boundary (never mid-step) and carries on with it as a note from you. Notes are applied oldest first. Refusals: 409 `run_not_active` (the run settled); 400 `invalid_note` or `note_too_long` (over 8192 bytes); 429 `too_many_notes` (20 notes already waiting), with `Retry-After`. The run's events record `note_queued` and `note_delivered` with the note id and length, never its text."
---

> Markdown twin of https://superbot.gg/developers/runs#sendRunMessage (the HTML page is canonical).
> The site index for agents is /llms.txt; every content page has a twin at its path plus `.md`.

# Steer a running cloud run

`POST /v1/runs/{run_id}/messages`

Add a note to a run that is queued or running. The run is not restarted: it reads the note at its next step boundary (never mid-step) and carries on with it as a note from you. Notes are applied oldest first. Refusals: 409 `run_not_active` (the run settled); 400 `invalid_note` or `note_too_long` (over 8192 bytes); 429 `too_many_notes` (20 notes already waiting), with `Retry-After`. The run's events record `note_queued` and `note_delivered` with the note id and length, never its text.

- Operation id: `sendRunMessage`
- Group: [Runs](https://superbot.gg/developers/runs.md)
- Auth: A caller key holding `runs:write` (`Authorization: Bearer sbc_…` or `x-api-key: sbc_…`), or a signed-in session.
- Scopes: `runs:write`

## Path parameters

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `run_id` | string | required | The run id (a Run `id`). |

## Request body

`application/json`, required.

- `text` (string, required): The note, up to 8192 bytes of UTF-8.

## Response 202

The note, queued.

`application/json`: RunNote.

- `id` (string, required)
- `object` (string, required): One of `run.note`.
- `run_id` (string, required)
- `queued_at` (string, required)

## Errors

Every refusal carries `error`, `message`, `doc_url` and `request_id`; the gateway routes answer in the dialect you dialed.

| Status | Codes | When |
| --- | --- | --- |
| 400 | [`invalid_request`](https://superbot.gg/developers#errors-invalid_request) | The request is malformed or a parameter is invalid; `param` names the field. |
| 401 | [`unauthorized`](https://superbot.gg/developers#errors-unauthorized) | The bearer is missing, malformed or unknown. |
| 403 | [`insufficient_scope`](https://superbot.gg/developers#errors-insufficient_scope) | The key lacks a scope (insufficient_scope), is revoked, or may not call this route. |
| 404 | [`not_found`](https://superbot.gg/developers#errors-not_found) | No such resource on this account. |
| 409 | [`conflict`](https://superbot.gg/developers#errors-conflict) | The resource is not in a state that allows this change. |
| 429 | [`rate_limited`](https://superbot.gg/developers#errors-rate_limited) | Over the per-key request bucket; retry after x-ratelimit-reset. |

## Examples

```sh
curl -sS -X POST "https://superbot.gg/v1/runs/$RUN_ID/messages" \
  -H "Authorization: Bearer $SUPERBOT_API_KEY" \
  -H "content-type: application/json" \
  -d '{"text":"Skip the migration for now and focus on the failing test."}'
```

```js
const runId = 'RUN_ID';
const res = await fetch(`https://superbot.gg/v1/runs/${runId}/messages`, {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${process.env.SUPERBOT_API_KEY}`,
    'content-type': 'application/json',
  },
  body: JSON.stringify({"text":"Skip the migration for now and focus on the failing test."}),
});
console.log(res.status, await res.json());
```

```python
import os
import requests

run_id = "RUN_ID"
res = requests.request(
    "POST",
    f"https://superbot.gg/v1/runs/{run_id}/messages",
    headers={
        "Authorization": f"Bearer {os.environ['SUPERBOT_API_KEY']}",
        "content-type": "application/json",
    },
    json={"text":"Skip the migration for now and focus on the failing test."},
)
print(res.status_code, res.json())
```