---
title: "Changes to Create a new custom action definition"
method: POST
path: "/automation/actions/2026-03/{appId}"
---

# Changes to Create a new custom action definition

`POST /automation/actions/2026-03/{appId}`

> Every recorded change to this operation, newest first.
> 14 revisions in range; 1 not diffed, 2 could not be searched.

## Timeline

Changed in 4 of 14 revisions.

- **2026-05-27** `f9c7181056c5`: 42 breaking, 42 info
- **2026-04-08** `b0d8bc008db9`: 1 info
- **2026-03-30** `dc2fdad57f7f`: 4 breaking, 6 info
- **2026-03-25** `37a93e10d5c4`: 1 info

## Changes

- **2026-05-27** `f9c7181056c5`: 42 breaking, 42 info
  - removed the enum value `ARRAY` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #1: INTEGER]/type`
  - removed the enum value `ARRAY` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #2: LONG]/type`
  - removed the enum value `ARRAY` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #3: DOUBLE]/type`
  - removed the enum value `ARRAY` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #4: STRING]/type`
  - removed the enum value `ARRAY` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #5: BOOLEAN]/type`
  - removed the enum value `ARRAY` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #7: OBJECT]/type`
  - removed the enum value `BOOLEAN` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #1: INTEGER]/type`
  - removed the enum value `BOOLEAN` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #2: LONG]/type`
  - removed the enum value `BOOLEAN` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #3: DOUBLE]/type`
  - removed the enum value `BOOLEAN` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #4: STRING]/type`
  - removed the enum value `BOOLEAN` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #6: ARRAY]/type`
  - removed the enum value `BOOLEAN` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #7: OBJECT]/type`
  - removed the enum value `DOUBLE` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #1: INTEGER]/type`
  - removed the enum value `DOUBLE` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #2: LONG]/type`
  - removed the enum value `DOUBLE` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #4: STRING]/type`
  - removed the enum value `DOUBLE` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #5: BOOLEAN]/type`
  - removed the enum value `DOUBLE` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #6: ARRAY]/type`
  - removed the enum value `DOUBLE` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #7: OBJECT]/type`
  - removed the enum value `INTEGER` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #2: LONG]/type`
  - removed the enum value `INTEGER` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #3: DOUBLE]/type`
  - removed the enum value `INTEGER` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #4: STRING]/type`
  - removed the enum value `INTEGER` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #5: BOOLEAN]/type`
  - removed the enum value `INTEGER` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #6: ARRAY]/type`
  - removed the enum value `INTEGER` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #7: OBJECT]/type`
  - removed the enum value `LONG` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #1: INTEGER]/type`
  - removed the enum value `LONG` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #3: DOUBLE]/type`
  - removed the enum value `LONG` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #4: STRING]/type`
  - removed the enum value `LONG` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #5: BOOLEAN]/type`
  - removed the enum value `LONG` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #6: ARRAY]/type`
  - removed the enum value `LONG` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #7: OBJECT]/type`
  - removed the enum value `OBJECT` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #1: INTEGER]/type`
  - removed the enum value `OBJECT` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #2: LONG]/type`
  - removed the enum value `OBJECT` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #3: DOUBLE]/type`
  - removed the enum value `OBJECT` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #4: STRING]/type`
  - removed the enum value `OBJECT` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #5: BOOLEAN]/type`
  - removed the enum value `OBJECT` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #6: ARRAY]/type`
  - removed the enum value `STRING` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #1: INTEGER]/type`
  - removed the enum value `STRING` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #2: LONG]/type`
  - removed the enum value `STRING` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #3: DOUBLE]/type`
  - removed the enum value `STRING` of the request property `outputFields/items/typeDefinition/schema/oneOf[subschema #5: BOOLEAN]/type`
  - …44 more
- **2026-04-08** `b0d8bc008db9`: 1 info
  - api operation id `post-/automation/actions/2026-03/{appId}_create` removed and replaced with `post-/automation/actions/2026-03/{appId}`
- **2026-03-30** `dc2fdad57f7f`: 4 breaking, 6 info
  - added the new required request property `outputFields/items/typeDefinition/options/items/doubleData`
  - added the new required request property `outputFields/items/typeDefinition/options/items/readOnly`
  - the request property `outputFields/items/typeDefinition/options/items/description` became required
  - the request property `outputFields/items/typeDefinition/options/items/displayOrder` became required
  - api tag `Definitions` added
  - api tag `Basic` removed
  - the response property `outputFields/items/typeDefinition/options/items/description` became required for the status `201`
  - the response property `outputFields/items/typeDefinition/options/items/displayOrder` became required for the status `201`
  - added the required property `outputFields/items/typeDefinition/options/items/doubleData` to the response with the `201` status
  - added the required property `outputFields/items/typeDefinition/options/items/readOnly` to the response with the `201` status
- **2026-03-25** `37a93e10d5c4`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/hubspot/apis/hubspot-api-specification/docs/automation/actions/2026-03/:appId/post.md) - [API](https://skmtc.dev/hubspot/apis/hubspot-api-specification.md) - [Page](https://skmtc.dev/hubspot/apis/hubspot-api-specification/changes/automation/actions/2026-03/:appId/post)