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

# Create fact

> Add a new fact for user individualization



## OpenAPI

````yaml /api-reference/openapi.yaml post /users/{user_id}/facts
openapi: 3.1.0
info:
  title: ONVY Health API
  description: >-
    AI-powered holistic health services API with data merging and metrics
    calculation
  version: 1.0.0
  contact:
    name: ONVY Support
    email: support@onvy.health
    url: https://onvy.health
  license:
    name: Proprietary
    url: https://onvy.health/terms
servers:
  - url: https://api.onvy.health
    description: Public API
security:
  - bearerAuth: []
tags:
  - name: static
    description: Static configuration endpoints
  - name: users
    description: User management
  - name: baselines
    description: User baseline metrics
  - name: daily-records
    description: Daily health records
  - name: chat
    description: AI chat completions
  - name: facts
    description: User facts for individualization
  - name: activities
    description: User activities (workouts and mindfulness sessions)
  - name: ai-summaries
    description: |
      AI-generated summaries. This is how ONVY exposes domain-specific
      insights such as meal nutrition analysis, sleep insights, workouts,
      and daily, weekly, nutrition, trend, and impact analysis. Most
      summary types are system-generated; the public create surface
      currently accepts `type=meal`.
  - name: custom-records
    description: Custom records and types
  - name: meals
    description: Nutrition meal tracking
paths:
  /users/{user_id}/facts:
    post:
      tags:
        - facts
      summary: Create fact
      description: Add a new fact for user individualization
      operationId: createFact
      parameters:
        - $ref: '#/components/parameters/UserIdParam'
      requestBody:
        description: Fact data
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateFactRequest'
      responses:
        '201':
          description: Fact created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Fact'
        '400':
          $ref: '#/components/responses/BadRequest'
        '500':
          $ref: '#/components/responses/InternalError'
components:
  parameters:
    UserIdParam:
      name: user_id
      in: path
      required: true
      description: User ID (e.g., google_104940819145861640201)
      schema:
        type: string
  schemas:
    CreateFactRequest:
      title: CreateFactRequest
      type: object
      required:
        - text
        - type
      properties:
        source:
          type: string
          description: Source of the fact
          enum:
            - survey
            - user_input
            - coach
            - integration
          ref:
            type:
              - string
              - 'null'
        text:
          type: string
          description: Fact text content
          minLength: 1
          maxLength: 1000
        type:
          type: string
          description: Fact category
          enum:
            - mind
            - body
            - activity
            - nutrition
            - sleep
            - recovery
            - goal
    Fact:
      title: Fact
      allOf:
        - title: CreateFactRequest
          type: object
          required:
            - text
            - type
          properties:
            source:
              type: string
              description: Source of the fact
              enum:
                - survey
                - user_input
                - coach
                - integration
              ref:
                type:
                  - string
                  - 'null'
            text:
              type: string
              description: Fact text content
              minLength: 1
              maxLength: 1000
            type:
              type: string
              description: Fact category
              enum:
                - mind
                - body
                - activity
                - nutrition
                - sleep
                - recovery
                - goal
        - type: object
          required:
            - user_id
            - created_at
            - updated_at
          properties:
            id:
              type: string
              description: Unique fact identifier
            user_id:
              type: string
              description: User ID
            certainty_on_creation:
              type: number
              minimum: 0
              maximum: 1
              description: Initial certainty score when the fact was created.
            certainty_on_update:
              type:
                - number
                - 'null'
              minimum: 0
              maximum: 1
              description: Most recent certainty score set during an update operation.
            created_at:
              type: string
              format: date-time
            updated_at:
              type: string
              format: date-time
    ValidationError:
      type: object
      title: ValidationError
      required:
        - error
      properties:
        error:
          type: string
          minLength: 1
      additionalProperties: false
  responses:
    BadRequest:
      description: Bad request
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ValidationError'
    InternalError:
      description: Internal server error
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ValidationError'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: OAuth bearer token for Health API authentication

````