---
search:
  tags:
    - Actions
    - GET
seo:
  description: >-
    Every definition this action has had, oldest first. Editing an action…
    Reference for the GET /api/v2/actions/{ref}/versions endpoint in the Anlyon
    API.
sidebar:
  label: List one action's immutable versions
  badge: GET
title: List one action's immutable versions
type: openapi-operation
---
Every definition this action has had, oldest first. Editing an action appends a version; nothing updates one. An agent version pins a version id in its `config.actions`, which is what makes rolling an agent back restore the tool definitions it was published with rather than whatever those tools have since been edited to.

`GET /api/v2/actions/{ref}/versions`