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

# Trust Score History

> Retrieve historical trust score data for a machine agent over time

Returns a time-series of trust score computations for a specific agent. Use this endpoint to visualize trust trends, detect score degradation, and audit score changes following incidents. Results are ordered chronologically (oldest first).

### Authentication

Requires `X-API-Key` header or Bearer JWT token. Tenant-scoped via `X-Tenant-ID`.

### Path Parameters

<ParamField path="agent_id" type="string" required>
  The unique identifier of the machine agent. Format: `maip-agent:ULID`.
</ParamField>

### Query Parameters

<ParamField query="from" type="string">
  ISO 8601 start timestamp for the history window. Defaults to 30 days ago.
</ParamField>

<ParamField query="to" type="string">
  ISO 8601 end timestamp for the history window. Defaults to now.
</ParamField>

<ParamField query="limit" type="integer" default="100">
  Maximum number of records to return. Range: `1`-`1000`.
</ParamField>

### Response

<ResponseField name="agent_id" type="string">
  The agent identifier.
</ResponseField>

<ResponseField name="history" type="array">
  Array of historical trust score records, ordered by `computed_at` ascending.

  <Expandable title="History record fields">
    <ResponseField name="history[].score" type="number">
      Trust score at the time of computation (`0.0`-`1.0`).
    </ResponseField>

    <ResponseField name="history[].factors" type="object">
      Factor breakdown at the time of computation.

      <Expandable title="Factor fields">
        <ResponseField name="history[].factors.anomaly_rate" type="number">
          Anomaly rate at time of computation.
        </ResponseField>

        <ResponseField name="history[].factors.uptime" type="number">
          Uptime ratio at time of computation.
        </ResponseField>

        <ResponseField name="history[].factors.delegation_depth" type="integer">
          Delegation chain depth at time of computation.
        </ResponseField>

        <ResponseField name="history[].factors.receipt_count" type="integer">
          Cumulative receipt count at time of computation.
        </ResponseField>
      </Expandable>
    </ResponseField>

    <ResponseField name="history[].computed_at" type="string">
      ISO 8601 timestamp of when this score was computed.
    </ResponseField>
  </Expandable>
</ResponseField>

<ResponseField name="total" type="integer">
  Total number of records matching the query window (before limit is applied).
</ResponseField>


## OpenAPI

````yaml mint-openapi.yaml GET /v1/agents/{agentId}/trust-history
openapi: 3.0.3
info:
  title: Truthlocks API
  description: >
    Truthlocks is a universal verification infrastructure for documents,
    credentials, and digital assets.

    This specification defines the canonical API for interacting with Truthlocks
    services.


    ## Base URLs

    - **Production**: `https://api.truthlocks.com`

    - **Sandbox**: `https://sandbox-api.truthlocks.com`


    ## Authentication

    - **API Keys**: Use `X-API-Key` header for machine-to-machine operations

    - **Bearer Tokens**: Use `Authorization: Bearer <jwt>` for user-initiated
    operations


    ## Tenant Identity

    In production, tenant identity is derived from the authenticated context
    (API key or JWT).

    The `X-Tenant-ID` header is ignored in production to prevent spoofing.
  version: 1.0.0
  contact:
    name: Truthlocks Support
    url: https://truthlocks.com/support
    email: support@truthlocks.com
servers:
  - url: https://api.truthlocks.com
    description: Production API
  - url: https://sandbox-api.truthlocks.com
    description: Sandbox Environment
security:
  - APIKey: []
tags:
  - name: Authentication
    description: API key and token management
  - name: Issuers
    description: Issuer registration and trust management
  - name: Keys
    description: Cryptographic key management for issuers
  - name: Attestations
    description: Attestation lifecycle (mint, revoke, supersede)
  - name: Verification
    description: Attestation verification and proof bundles
  - name: Governance
    description: Issuer governance workflows (admin only)
  - name: Identity
    description: Organization, user, and role management
  - name: Audit
    description: Audit event queries
  - name: Platform
    description: Platform administration (super admin only)
  - name: Platform Review
    description: Staff review workflows for issuer applications
  - name: Tenant Console
    description: Tenant profile and lifecycle endpoints
  - name: Health
    description: Service health and readiness endpoints
  - name: Risk
    description: Risk signal ingestion and fraud detection
  - name: Risk Enforcement
    description: Risk enforcement actions — block, challenge, quarantine, and configuration
  - name: Billing
    description: Billing, subscription, and addon management
  - name: Machine Identity
    description: >-
      Machine Agent Identity Protocol (MAIP) — agent registration, sessions,
      trust, witness, compliance, orchestration, and observability
externalDocs:
  description: Transparency read-only API (separate service spec)
  url: >-
    https://github.com/truthlocks/truthlock/blob/main/docs/transparency/openapi.yaml
paths:
  /v1/agents/{agentId}/trust-history:
    get:
      tags:
        - Machine Identity
      summary: Trust Score History
      description: Returns historical trust score values over time for trend analysis.
      operationId: maip.agents.trust.history
      parameters:
        - name: agentId
          in: path
          required: true
          schema:
            type: string
            format: uuid
          description: Agent identifier
        - name: from
          in: query
          schema:
            type: string
            format: date-time
          description: Start of time range (ISO 8601)
        - name: to
          in: query
          schema:
            type: string
            format: date-time
          description: End of time range (ISO 8601)
        - name: limit
          in: query
          schema:
            type: integer
            default: 50
            minimum: 1
            maximum: 500
      responses:
        '200':
          description: Trust score history
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MaipTrustHistory'
        '401':
          description: Authentication required
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorEnvelope'
        '404':
          description: Agent not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorEnvelope'
        '429':
          description: Rate limit exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorEnvelope'
      security:
        - APIKey: []
components:
  schemas:
    MaipTrustHistory:
      type: object
      properties:
        history:
          type: array
          items:
            type: object
            properties:
              score:
                type: number
                format: float
                minimum: 0
                maximum: 1
              timestamp:
                type: string
                format: date-time
              factors:
                type: object
                additionalProperties: true
    ErrorEnvelope:
      type: object
      required:
        - code
        - message
        - http_status
      properties:
        code:
          type: string
          description: Machine-readable error code
          enum:
            - AUTH_REQUIRED
            - AUTH_INVALID
            - PERMISSION_DENIED
            - TENANT_IDENTITY_UNVERIFIED
            - NOT_FOUND
            - VALIDATION_ERROR
            - CONFLICT
            - PAYLOAD_TOO_LARGE
            - RATE_LIMIT_EXCEEDED
            - QUOTA_EXCEEDED
            - SERVICE_UNAVAILABLE
            - INTERNAL_ERROR
        message:
          type: string
          description: Human-readable error message
        http_status:
          type: integer
          description: HTTP status code
        retry_after_ms:
          type: integer
          description: Milliseconds to wait before retrying (for rate limits)
        details:
          type: object
          description: Additional error context
      example:
        code: AUTH_REQUIRED
        message: Authentication required
        http_status: 401
  securitySchemes:
    APIKey:
      type: apiKey
      in: header
      name: X-API-Key
      description: API key for machine-to-machine authentication

````