---
title: "Changes to Generate an AI subject line for one lead (synchronous)"
method: POST
path: "/v1/ai/subject"
---

# Changes to Generate an AI subject line for one lead (synchronous)

`POST /v1/ai/subject`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 3 of 4 revisions.

- **2026-11-11** `fe00e1fbf676`: 9 breaking, 2 warning, 68 info
- **2026-11-08** `a487d818c900`: 5 info
- **2026-11-01** `292da843ca31`: 1 info

## Changes

- **2026-11-11** `fe00e1fbf676`: 9 breaking, 2 warning, 68 info
  - the `error` response's property type changed from `string` to `object` for status `400`
  - the `error` response's property type changed from `string` to `object` for status `401`
  - the `success` response's property type changed from `boolean` to no type for status `400`
  - the `success` response's property type changed from `boolean` to no type for status `401`
  - the `success` response's property type changed from `boolean` to no type for status `402`
  - the `success` response's property type changed from `boolean` to no type for status `404`
  - the `success` response's property type changed from `boolean` to no type for status `422`
  - the `success` response's property type changed from `boolean` to no type for status `429`
  - the `success` response's property type changed from `boolean` to no type for status `503`
  - removed the optional property `code` from the response with the `400` status
  - removed the optional property `code` from the response with the `401` status
  - api operation id `generateAiSubject` was added
  - the endpoint scheme security `apiKeyAuth` was removed from the API
  - the endpoint scheme security `bearerAuth` was removed from the API
  - added the new optional `header` request parameter `Idempotency-Key`
  - added the non-success response with the status `403`
  - added the non-success response with the status `409`
  - added the non-success response with the status `500`
  - added the optional property `error/details` to the response with the `400` status
  - added the optional property `error/details` to the response with the `401` status
  - added the optional property `error/field` to the response with the `400` status
  - added the optional property `error/field` to the response with the `401` status
  - the response property `error` became required for the status `400`
  - the response property `error` became required for the status `401`
  - the response property `error` became required for the status `402`
  - the response property `error` became required for the status `404`
  - the response property `error` became required for the status `422`
  - the response property `error` became required for the status `429`
  - the response property `error` became required for the status `503`
  - the response property `error/code` became required for the status `402`
  - the response property `error/code` became required for the status `404`
  - the response property `error/code` became required for the status `422`
  - the response property `error/code` became required for the status `429`
  - the response property `error/code` became required for the status `503`
  - the response property `error/details/items/code` became required for the status `402`
  - the response property `error/details/items/code` became required for the status `404`
  - the response property `error/details/items/code` became required for the status `422`
  - the response property `error/details/items/code` became required for the status `429`
  - the response property `error/details/items/code` became required for the status `503`
  - the response property `error/details/items/field` became required for the status `402`
  - …39 more
- **2026-11-08** `a487d818c900`: 5 info
  - added the optional property `error/details/items/code` to the response with the `402` status
  - added the optional property `error/details/items/code` to the response with the `404` status
  - added the optional property `error/details/items/code` to the response with the `422` status
  - added the optional property `error/details/items/code` to the response with the `429` status
  - added the optional property `error/details/items/code` to the response with the `503` status
- **2026-11-01** `292da843ca31`: 1 info
  - the endpoint scheme security `bearerAuth` was added to the API

---

[Operation](https://skmtc.dev/meirra/apis/meirra-api/docs/v1/ai/subject/post.md) - [API](https://skmtc.dev/meirra/apis/meirra-api.md) - [Page](https://skmtc.dev/meirra/apis/meirra-api/changes/v1/ai/subject/post)