> ## Documentation Index
> Fetch the complete documentation index at: https://docs.px0.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Diff Skill Versions

> Compares the files of two skill versions and returns a unified diff.



## OpenAPI

````yaml /openapi.yaml get /v1/skills/{id}/versions/diff
openapi: 3.1.0
info:
  title: px0 API
  description: >
    px[0] is an open-source prompt infrastructure toolkit for managing prompts
    in production. It replaces hardcoded prompt strings with versioned
    templates, in-process caching, and OpenTelemetry observability, so teams can
    iterate on prompts without touching application code. This is the OpenAPI
    specification for all the public APIs of px0.
  version: 1.0.0
servers:
  - url: http://localhost:3000
    description: Local development server
security: []
paths:
  /v1/skills/{id}/versions/diff:
    get:
      tags:
        - Skill Versions
      summary: Diff Skill Versions
      description: Compares the files of two skill versions and returns a unified diff.
      operationId: diffSkillVersions
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: string
        - name: from
          in: query
          required: true
          schema:
            type: string
        - name: to
          in: query
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Versions compared successfully
          content:
            application/json:
              schema:
                type: object
                properties:
                  from_version:
                    type: integer
                  to_version:
                    type: integer
                  diff:
                    type: string
        '400':
          description: Missing or invalid parameters
        '401':
          description: Unauthorized
        '404':
          description: Skill or version not found
      security:
        - BearerAuth: []
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: >-
        Use an access token retrieved from login (Bearer sess_...) or a
        programmatic API key (Bearer ak_...).

````