Assert a fact

POST

facts

Assert a fact

curl --request POST \
  --url https://api.getarbol.com/v1/facts \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "definitionId": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
  "subject": {
    "id": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
    "type": "contact"
  },
  "value": {
    "type": "text",
    "value": "<string>"
  }
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    definitionId: 'agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31',
    subject: {id: 'agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31', type: 'contact'},
    value: {type: 'text', value: '<string>'}
  })
};

fetch('https://api.getarbol.com/v1/facts', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.getarbol.com/v1/facts"

payload = {
    "definitionId": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
    "subject": {
        "id": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
        "type": "contact"
    },
    "value": {
        "type": "text",
        "value": "<string>"
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "confidence": 0.5,
  "definition": {
    "description": "<string>",
    "id": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
    "identifier": "<string>",
    "kind": "attribute",
    "subjectKind": "contact",
    "valueType": "option"
  },
  "id": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
  "observedAt": "2026-08-29T14:30:00Z",
  "reason": "<string>",
  "recordedAt": "2026-08-29T14:30:00Z",
  "setBy": "user",
  "subject": {
    "id": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
    "type": "contact"
  },
  "value": {
    "type": "text",
    "value": "<string>"
  },
  "verificationStatus": "unreviewed"
}

{
  "defined": true,
  "inferable": true,
  "code": "BAD_REQUEST",
  "status": 400,
  "message": "<string>",
  "data": {
    "issues": [
      {
        "message": "<string>",
        "path": [
          "<string>"
        ]
      }
    ],
    "truncated": true
  }
}

{
  "defined": true,
  "inferable": true,
  "code": "UNAUTHORIZED",
  "status": 401,
  "message": "<string>",
  "data": "<unknown>"
}

{
  "defined": true,
  "inferable": true,
  "code": "FORBIDDEN",
  "status": 403,
  "message": "<string>",
  "data": {
    "missingPermissions": [
      "agents:read"
    ]
  }
}

{
  "defined": true,
  "inferable": true,
  "code": "NOT_FOUND",
  "status": 404,
  "message": "<string>",
  "data": "<unknown>"
}

{
  "defined": true,
  "inferable": true,
  "code": "CONFLICT",
  "status": 409,
  "message": "<string>",
  "data": "<unknown>"
}

{
  "code": "PAYLOAD_TOO_LARGE",
  "defined": false,
  "inferable": false,
  "message": "<string>",
  "data": "<unknown>"
}

{
  "code": "UNSUPPORTED_MEDIA_TYPE",
  "defined": false,
  "inferable": false,
  "message": "<string>",
  "data": "<unknown>"
}

{
  "defined": true,
  "inferable": true,
  "code": "UNPROCESSABLE_CONTENT",
  "status": 422,
  "message": "<string>",
  "data": "<unknown>"
}

Authorizations

Authorization

string

header

required

Organization-scoped Auth0 user access token issued to an approved first-party client or exchanged by a trusted OBO resource server.

Body

application/json

Immutable typed assertion; an idempotency key is valid only with a stable observedAt timestamp.

definitionId

string

required

Opaque Arbol resource identifier; the endpoint and tenant-scoped lookup determine its resource type.

Maximum string length: 64

Pattern: ^[a-z][a-z0-9]{1,15}_[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$

Example:

"agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31"

subject

object

required

Show child attributes

value

object

required

Show child attributes

confidence

number | null

Required range: 0 <= x <= 1

idempotencyKey

string

Required string length: 1 - 200

observedAt

string<date-time>

ISO 8601 timestamp with an explicit UTC offset.

Pattern:

^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$

Example:

"2026-08-29T14:30:00Z"

reason

string | null

Maximum string length: 2000

Response

Recorded immutable assertion with its Definition snapshot, provenance, and review state.

confidence

number | null

required

Required range: 0 <= x <= 1

definition

object

required

Show child attributes

string

required

Opaque Arbol resource identifier; the endpoint and tenant-scoped lookup determine its resource type.

Maximum string length: 64

Pattern: ^[a-z][a-z0-9]{1,15}_[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$

Example:

"agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31"

observedAt

string<date-time>

required

ISO 8601 timestamp with an explicit UTC offset.

Pattern:

^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$

Example:

"2026-08-29T14:30:00Z"

reason

string | null

required

Maximum string length: 2000

recordedAt

string<date-time>

required

ISO 8601 timestamp with an explicit UTC offset.

Pattern:

^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$

Example:

"2026-08-29T14:30:00Z"

setBy

enum<string>

required

Origin category recorded for a Fact assertion.

Available options:

ai,

user,

system,

import,

rule

Example:

"user"

subject

object

required

Show child attributes

value

Fact value · object

required

Typed value of an immutable Fact assertion; unset is an explicit tombstone.

Show child attributes

verificationStatus

enum<string>

required

Human review state of a Fact assertion.

Available options:

unreviewed,

confirmed,

rejected

Example:

"unreviewed"

⌘I

Assert a fact

curl --request POST \
  --url https://api.getarbol.com/v1/facts \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "definitionId": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
  "subject": {
    "id": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
    "type": "contact"
  },
  "value": {
    "type": "text",
    "value": "<string>"
  }
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    definitionId: 'agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31',
    subject: {id: 'agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31', type: 'contact'},
    value: {type: 'text', value: '<string>'}
  })
};

fetch('https://api.getarbol.com/v1/facts', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.getarbol.com/v1/facts"

payload = {
    "definitionId": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
    "subject": {
        "id": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
        "type": "contact"
    },
    "value": {
        "type": "text",
        "value": "<string>"
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "confidence": 0.5,
  "definition": {
    "description": "<string>",
    "id": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
    "identifier": "<string>",
    "kind": "attribute",
    "subjectKind": "contact",
    "valueType": "option"
  },
  "id": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
  "observedAt": "2026-08-29T14:30:00Z",
  "reason": "<string>",
  "recordedAt": "2026-08-29T14:30:00Z",
  "setBy": "user",
  "subject": {
    "id": "agt_018f47a2-4f4d-7d61-9e2c-1d7b8e9a0c31",
    "type": "contact"
  },
  "value": {
    "type": "text",
    "value": "<string>"
  },
  "verificationStatus": "unreviewed"
}

{
  "defined": true,
  "inferable": true,
  "code": "BAD_REQUEST",
  "status": 400,
  "message": "<string>",
  "data": {
    "issues": [
      {
        "message": "<string>",
        "path": [
          "<string>"
        ]
      }
    ],
    "truncated": true
  }
}

{
  "defined": true,
  "inferable": true,
  "code": "UNAUTHORIZED",
  "status": 401,
  "message": "<string>",
  "data": "<unknown>"
}

{
  "defined": true,
  "inferable": true,
  "code": "FORBIDDEN",
  "status": 403,
  "message": "<string>",
  "data": {
    "missingPermissions": [
      "agents:read"
    ]
  }
}

{
  "defined": true,
  "inferable": true,
  "code": "NOT_FOUND",
  "status": 404,
  "message": "<string>",
  "data": "<unknown>"
}

{
  "defined": true,
  "inferable": true,
  "code": "CONFLICT",
  "status": 409,
  "message": "<string>",
  "data": "<unknown>"
}

{
  "code": "PAYLOAD_TOO_LARGE",
  "defined": false,
  "inferable": false,
  "message": "<string>",
  "data": "<unknown>"
}

{
  "code": "UNSUPPORTED_MEDIA_TYPE",
  "defined": false,
  "inferable": false,
  "message": "<string>",
  "data": "<unknown>"
}

{
  "defined": true,
  "inferable": true,
  "code": "UNPROCESSABLE_CONTENT",
  "status": 422,
  "message": "<string>",
  "data": "<unknown>"
}

Overview

Endpoints

Assert a fact

Authorizations

Body

Response