---
name: "newsletters_update_issue"
area: "newsletters"
title: "Change a draft issue"
price: "free"
method: "POST"
url: "https://api.conecto.chat/v1/tools/newsletters_update_issue"
mcp_server: "https://api.conecto.chat/mcp/newsletters"
auth: "Authorization: Bearer <conecto_sk_ key>"
docs_url: "https://conecto.chat/tools/newsletters/newsletters_update_issue"
---

# Change a draft issue (`newsletters_update_issue`)

Changes a draft issue's subject, body or preheader.

Change a draft's subject, body or preheader. Give only what changes.

Price: Free. A call that fails costs nothing.

## Use it when

A draft needs a fix before it goes out.

## Say this to your agent

> Change the October issue's subject to "Tune-up special: 15% off from Saturday".

## Inputs

| Name | Type | Required | Description | Allowed values | Default |
|---|---|---|---|---|---|
| `issue_id` | string | yes | The issue_id newsletters_write_issue returned. Exactly 36 characters. |  |  |
| `subject` | string | no | 1 to 200 characters. |  |  |
| `body` | string | no | Markdown: headings, lists, links, bold, quotes, tables and https images. 1 to 100,000 characters. |  |  |
| `preheader` | string | no | Up to 200 characters. |  |  |

## Example

Written for Halverson Cycle & Repair, a bike shop with a repair workshop in Portland, Oregon.

MCP: call `newsletters_update_issue` on the MCP server `https://api.conecto.chat/mcp/newsletters` with these arguments:

```json
{
  "issue_id": "0c6e2a9f-4d1b-4e8a-9b3c-7f5d2e1a8c40",
  "subject": "Tune-up special: 15% off from Saturday"
}
```

REST:

```bash
curl https://api.conecto.chat/v1/tools/newsletters_update_issue \
  -H "Authorization: Bearer $CONECTO_KEY" \
  -H "Content-Type: application/json" \
  -d '{"issue_id": "0c6e2a9f-4d1b-4e8a-9b3c-7f5d2e1a8c40", "subject": "Tune-up special: 15% off from Saturday"}'
```

## Response

```json
{
  "call_id": "5f0c8a2e-3b7d-4c1e-9a64-2d8e1f7b0c93",
  "tool": "newsletters_update_issue",
  "status": "succeeded",
  "replayed": false,
  "cost_usd": "$0.00",
  "balance_usd": "$19.75",
  "result": {
    "issue": {
      "issue_id": "0c6e2a9f-4d1b-4e8a-9b3c-7f5d2e1a8c40",
      "number": null,
      "subject": "Tune-up special: 15% off from Saturday",
      "preheader": "All-weather and studded tires, and 15% off tune-ups from October 24.",
      "status": "draft",
      "send_at": null,
      "web_url": null,
      "created_at": "2026-10-14T08:00:00+00:00",
      "finished_at": null
    }
  }
}
```

`result`: The issue as it now is.

## Errors

| Code | Status | When | Fix |
|---|---|---|---|
| `not_found` | 404 | No issue of the business has that issue_id. | Find it with newsletters_list_issues and use its issue_id. |
| `not_draft` | 409 | The issue was scheduled or sent already; only a draft can change or be sent. | Write a new issue with newsletters_write_issue. |

The refusals every tool can give (401 key, 402 balance, 429 limits) are on the errors page: https://conecto.chat/docs/errors.md

## Related

- [newsletters_connect_service](https://conecto.chat/tools/newsletters/newsletters_connect_service.md): Connects the business's own email service (Brevo, Amazon SES, Mailgun or any SMTP server), which every newsletter email goes out through. Free.
- [newsletters_remove_service](https://conecto.chat/tools/newsletters/newsletters_remove_service.md): Disconnects the business's email service and forgets its password; newsletters wait until one is connected again. Free.
- [newsletters_create](https://conecto.chat/tools/newsletters/newsletters_create.md): Creates a newsletter people join on its own page by confirming their address, sent through the business's own email service. Free.
- [newsletters_update](https://conecto.chat/tools/newsletters/newsletters_update.md): Renames a newsletter or changes its description, postal address or archive. Free.
- [newsletters_list](https://conecto.chat/tools/newsletters/newsletters_list.md): The business's newsletters with their pages and subscriber counts, and the email service they go out through. Free up to 1,000,000 reads a month.
- [newsletters_invite](https://conecto.chat/tools/newsletters/newsletters_invite.md): Emails each person a request to confirm a subscription; only those who confirm ever get an issue. Free.
- [newsletters_subscribers](https://conecto.chat/tools/newsletters/newsletters_subscribers.md): Who is on a newsletter, newest first: confirmed, waiting to confirm, unsubscribed, bounced or complained. Free up to 1,000,000 reads a month.
- [newsletters_remove_subscriber](https://conecto.chat/tools/newsletters/newsletters_remove_subscriber.md): Deletes someone from a newsletter for good, with their history. Free.
- [newsletters_write_issue](https://conecto.chat/tools/newsletters/newsletters_write_issue.md): Writes a draft issue in Markdown, to test and then send. Free.
- [newsletters_send_test](https://conecto.chat/tools/newsletters/newsletters_send_test.md): Emails an issue to up to 5 addresses as subscribers will see it, marked [Test]. Free.
- [newsletters_send_issue](https://conecto.chat/tools/newsletters/newsletters_send_issue.md): Sends a draft to everyone who confirmed, now or at a set time, through the business's own email service. Free.
- [newsletters_cancel_issue](https://conecto.chat/tools/newsletters/newsletters_cancel_issue.md): Stops a scheduled issue, or one still going out; what went out already stays sent. Free.
- [newsletters_get_issue](https://conecto.chat/tools/newsletters/newsletters_get_issue.md): One issue: its text, where it stands, and once sent how many it reached, bounced, unsubscribed and clicked, link by link. Free up to 1,000,000 reads a month.
- [newsletters_list_issues](https://conecto.chat/tools/newsletters/newsletters_list_issues.md): A newsletter's issues, newest first, optionally of one status. Free up to 1,000,000 reads a month.