> ## Documentation Index
> Fetch the complete documentation index at: https://docs.2501.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# List versions

> Newest first: each change to a versioned resource (specialties, operational rules, gateway prompts and scenarios). With `org_id`, the versions of that organization plus the tenant-wide ones; without, every version the caller can see. `resource_type`, `resource_id` and the `created_gte` / `created_lte` bounds (ISO 8601, inclusive) narrow the list.



## OpenAPI

````yaml /0.20/openapi.json get /api/v1/versions
openapi: 3.0.3
info:
  title: 2501 Public API
  version: v1
  description: >-
    The stable, versioned HTTP API for driving 2501 as code. See the API
    Overview for authentication, the org_id rule, cursor pagination, and the
    error envelope.
servers:
  - url: https://{command_center_host}
    variables:
      command_center_host:
        default: your-command-center-host
        description: Your Command Center host
security:
  - bearerAuth: []
paths:
  /api/v1/versions:
    get:
      tags:
        - Versions
      summary: List versions
      description: >-
        Newest first: each change to a versioned resource (specialties,
        operational rules, gateway prompts and scenarios). With `org_id`, the
        versions of that organization plus the tenant-wide ones; without, every
        version the caller can see. `resource_type`, `resource_id` and the
        `created_gte` / `created_lte` bounds (ISO 8601, inclusive) narrow the
        list.
      parameters:
        - schema:
            type: string
            default: '25'
          required: false
          name: limit
          in: query
        - schema:
            type: string
          required: false
          name: starting_after
          in: query
        - schema:
            type: string
          required: false
          name: ending_before
          in: query
        - schema:
            anyOf:
              - type: string
                enum:
                  - total_count
              - type: array
                items:
                  type: string
                  enum:
                    - total_count
          required: false
          name: include
          in: query
        - schema:
            type: string
          required: false
          name: org_id
          in: query
        - schema:
            type: string
            enum:
              - specialty
              - operational_rule
              - gateway
              - gateway_outbound
              - scenario
          required: false
          name: resource_type
          in: query
        - schema:
            type: string
          required: false
          name: resource_id
          in: query
        - schema:
            type: string
            format: date-time
          required: false
          name: created_gte
          in: query
        - schema:
            type: string
            format: date-time
          required: false
          name: created_lte
          in: query
      responses:
        '200':
          description: A page of versions
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VersionList'
        '400':
          description: >-
            Bad request - a field is missing, malformed, or not allowed
            (VALIDATION_FAILED, BAD_REQUEST, INVALID_CURSOR)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: >-
            No credentials, or a key that is invalid, revoked, or expired
            (UNAUTHORIZED)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: >-
            Authenticated but not allowed (FORBIDDEN, ORG_ACCESS_DENIED,
            STEP_UP_REFUSED, TWO_FACTOR_ENROLLMENT_REQUIRED,
            LICENSE_CAP_REACHED, LICENSE_EXPIRED)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    VersionList:
      type: object
      properties:
        object:
          type: string
          enum:
            - list
        data:
          type: array
          items:
            $ref: '#/components/schemas/Version'
        has_more:
          type: boolean
        total_count:
          type: integer
          description: Present only when include=total_count is set
      required:
        - object
        - data
        - has_more
    Error:
      type: object
      properties:
        code:
          type: string
          example: VALIDATION_FAILED
        message:
          type: string
          example: Validation failed
        request_id:
          type: string
          example: req_3702b7e7-...
        field:
          type: string
          description: Set when one input is at fault
        errors:
          type: array
          items:
            type: object
            properties:
              field:
                type: string
              message:
                type: string
            required:
              - field
              - message
          description: Set when several inputs are at fault
        details:
          type: object
          additionalProperties:
            nullable: true
      required:
        - code
        - message
        - request_id
    Version:
      type: object
      properties:
        id:
          type: string
          example: ver_1f6a3d9e-...
        resource_type:
          type: string
          enum:
            - specialty
            - operational_rule
            - gateway
            - gateway_outbound
            - scenario
        resource_id:
          type: string
        org_id:
          type: string
          nullable: true
        action:
          type: string
          enum:
            - CREATE
            - UPDATE
            - DELETE
        user_id:
          type: string
          nullable: true
          description: The user who made the change
        content:
          type: string
          description: The versioned text as it was after the change
        created_at:
          type: string
          format: date-time
          example: '2026-08-26T10:00:26.380Z'
      required:
        - id
        - resource_type
        - resource_id
        - org_id
        - action
        - user_id
        - content
        - created_at
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        An API key minted in Command Center (Settings -> API Keys), sent as
        `Authorization: Bearer 2501_ak_...`. A Command Center session cookie is
        also accepted.

````

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