openapi: 3.2.0
info:
  title: Engrail Therapeutics Site Content API (WordPress REST) Categories API
  version: wp/v2
  description: The public, anonymously-readable content API exposed by engrail.com. Engrail Therapeutics is a clinical-stage precision-neuroscience company and does not publish a product API; this contract is the read-only content surface its WordPress-backed corporate site exposes at /wp-json/wp/v2. It is DERIVED mechanically from the provider's own route-discovery document - every path, method, and parameter below is copied verbatim from https://www.engrail.com/wp-json/ . Write operations exist on the live host but require authentication and are deliberately not modelled here.
  contact:
    name: Engrail Therapeutics
    url: https://www.engrail.com/contact-us/
  x-derived-from: https://www.engrail.com/wp-json/
  x-derivation-method: route-discovery
  x-evidence:
    fetched: '2026-08-01'
    url: https://www.engrail.com/wp-json/
    http_status: 200
    content_type: application/json
servers:
- url: https://www.engrail.com/wp-json
  description: Production
tags:
- name: Categories
paths:
  /wp/v2/categories:
    get:
      operationId: listCategories
      summary: List categories
      description: Derived from the WordPress REST API route discovery document published at https://www.engrail.com/wp-json/ . Anonymous read access verified 2026-08-01.
      tags:
      - Categories
      parameters:
      - name: context
        in: query
        required: false
        schema:
          type: string
          enum:
          - view
          - embed
          - edit
          default: view
        description: Scope under which the request is made; determines fields present in response.
      - name: exclude
        in: query
        required: false
        schema:
          type: array
          default: []
          items:
            type: integer
        description: Ensure result set excludes specific IDs.
      - name: hide_empty
        in: query
        required: false
        schema:
          type: boolean
          default: false
        description: Whether to hide terms not assigned to any posts.
      - name: include
        in: query
        required: false
        schema:
          type: array
          default: []
          items:
            type: integer
        description: Limit result set to specific IDs.
      - name: order
        in: query
        required: false
        schema:
          type: string
          enum:
          - asc
          - desc
          default: asc
        description: Order sort attribute ascending or descending.
      - name: orderby
        in: query
        required: false
        schema:
          type: string
          enum:
          - id
          - include
          - name
          - slug
          - include_slugs
          - term_group
          - description
          - count
          default: name
        description: Sort collection by term attribute.
      - name: page
        in: query
        required: false
        schema:
          type: integer
          default: 1
          minimum: 1
        description: Current page of the collection.
      - name: parent
        in: query
        required: false
        schema:
          type: integer
        description: Limit result set to terms assigned to a specific parent.
      - name: per_page
        in: query
        required: false
        schema:
          type: integer
          default: 10
          minimum: 1
          maximum: 100
        description: Maximum number of items to be returned in result set.
      - name: post
        in: query
        required: false
        schema:
          type: integer
          default: null
        description: Limit result set to terms assigned to a specific post.
      - name: search
        in: query
        required: false
        schema:
          type: string
        description: Limit results to those matching a string.
      - name: slug
        in: query
        required: false
        schema:
          type: array
          items:
            type: string
        description: Limit result set to terms with one or more specific slugs.
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                type: array
                items:
                  type: object
          headers:
            X-WP-Total:
              description: Total number of items in the collection.
              schema:
                type: integer
            X-WP-TotalPages:
              description: Total number of pages in the collection.
              schema:
                type: integer
            Link:
              description: RFC 8288 pagination links (rel=next / rel=prev).
              schema:
                type: string
        '400':
          $ref: '#/components/responses/BadRequest'
  /wp/v2/categories/{id}:
    get:
      operationId: getCategory
      summary: Retrieve a single category by id
      description: Derived from the WordPress REST API route discovery document published at https://www.engrail.com/wp-json/ . Anonymous read access verified 2026-08-01.
      tags:
      - Categories
      parameters:
      - name: id
        in: path
        required: true
        description: Unique identifier for the category.
        schema:
          type: integer
      - name: context
        in: query
        required: false
        schema:
          type: string
          enum:
          - view
          - embed
          - edit
          default: view
        description: Scope under which the request is made; determines fields present in response.
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                type: object
        '400':
          $ref: '#/components/responses/BadRequest'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  schemas:
    Error:
      type: object
      description: WordPress REST API error envelope (observed live 2026-08-01).
      properties:
        code:
          type: string
          description: Machine-readable error code, e.g. rest_post_invalid_id.
        message:
          type: string
          description: Human-readable error message.
        data:
          type: object
          properties:
            status:
              type: integer
              description: HTTP status code.
            params:
              type: object
              description: Per-parameter validation messages.
            details:
              type: object
              description: Per-parameter structured error details.
      required:
      - code
      - message
      - data
  responses:
    NotFound:
      description: No matching resource (rest_post_invalid_id / rest_no_route).
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    BadRequest:
      description: Invalid parameter (rest_invalid_param).
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    applicationPassword:
      type: http
      scheme: basic
      description: WordPress Application Passwords, advertised by the site's own REST index (authentication.application-passwords.endpoints.authorization = https://www.engrail.com/wp-admin/authorize-application.php). Required only for write operations and non-public collections; the operations modelled here are anonymously readable.