The Workflow Transition API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for workflow transition.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Workflow Transition API
version: 2.0.0
description: Pay-per-call agents settled in USDC on Base via x402. Every response carries a signed provenance envelope.
contact:
name: WritersLogic
url: https://writerslogic.com/agents
email: agents@writerslogic.com
servers:
- url: https://agents.writerslogic.com
tags:
- name: Workflow Transition
paths:
/api/v1/workflow-transition:
post:
operationId: workflow_transition
summary: Is this state transition allowed by the caller's workflow definition, and what…
description: 'Given a caller-supplied state machine (transitions with optional event names and required facts), the current state and a requested event or target state, says whether the transition is allowed, which required facts are false or unknown, and which transitions are available from the current state. For an agent about to move an order, ticket, deployment or approval to its next state. Terminal states allow nothing. Ambiguous requests (one event leading to several states) are reported, not guessed. Does not know any workflow by itself and does not persist state.
Price: 0.005 USDC on Base (x402).'
x-x402-price-usdc: '0.005'
x-x402-amount: '5000'
x-payment-info:
protocols:
- x402
price:
mode: fixed
currency: USD
amount: '0.005'
x-audience: agent-infra
x-sample-url: https://agents.writerslogic.com/api/v1/samples/workflow-transition
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- transitions
- current
- request
properties:
transitions:
type: array
minItems: 1
maxItems: 300
items:
type: object
additionalProperties: false
required:
- from
- to
properties:
from:
type: string
minLength: 1
maxLength: 200
to:
type: string
minLength: 1
maxLength: 200
event:
type: string
minLength: 1
maxLength: 200
requires:
type: array
maxItems: 20
items:
type: string
minLength: 1
maxLength: 200
description: Names of facts that must be true.
terminal:
type: array
maxItems: 100
items:
type: string
minLength: 1
maxLength: 200
description: States with no outgoing transitions allowed even if listed.
current:
type: string
minLength: 1
maxLength: 200
request:
type: object
additionalProperties: false
description: Give event, to, or both.
properties:
event:
type: string
minLength: 1
maxLength: 200
to:
type: string
minLength: 1
maxLength: 200
facts:
type: array
maxItems: 200
items:
type: object
additionalProperties: false
required:
- name
- value
properties:
name:
type: string
minLength: 1
maxLength: 200
value:
type: boolean
example:
transitions:
- from: draft
to: review
event: submit
requires:
- has_title
- from: review
to: published
event: approve
requires:
- approved_by_editor
current: draft
request:
event: submit
facts:
- name: has_title
value: true
responses:
'200':
description: Paid result with provenance
content:
application/json:
schema:
type: object
properties:
data:
type: object
properties:
status:
type: string
enum:
- pass
- fail
- unknown
- unsupported
description: 'pass: every rule held. fail: a rule was violated (see witnesses). unknown: the input lacks the evidence to decide. unsupported: outside what this engine covers. Missing evidence is never a pass.'
allowed:
type: boolean
target:
type: string
description: The resolved target state, when the request resolves to one transition.
missingFacts:
type: array
items:
type: string
description: Required facts that are false.
unknownFacts:
type: array
items:
type: string
description: Required facts not supplied.
available:
type: array
items:
type: object
properties:
event:
type: string
to:
type: string
ready:
type: boolean
witnesses:
type: array
items:
type: object
properties:
ruleId:
type: string
detail:
type: string
path:
type: string
description: JSON pointer or dotted path into the input.
offset:
type: integer
index:
type: integer
expected:
description: What the rule required.
actual:
description: What the input had.
versions:
type: object
description: Every semantic dependency of this answer (engine, tables and their as-of dates, tokenizer, calendar, rounding profile).
limits:
type: array
items:
type: string
deterministic:
type: boolean
description: 'Always true: pure code, no model.'
_provenance:
type: object
description: C2PA-aligned manifest and W3C VC 2.0 (eddsa-jcs-2022) issued by the hub DID; verify at POST /api/v1/verify-provenance
required:
- data
- _provenance
'400':
description: Invalid request (no payment consumed)
content:
application/json:
schema:
type: object
properties:
error:
type: string
code:
type: string
'401':
description: Invalid X-API-KEY
content:
application/json:
schema:
type: object
properties:
error:
type: string
code:
type: string
'402':
description: Payment required or invalid
content:
application/json:
schema:
type: object
description: x402 v2 PaymentRequired (also base64 in the PAYMENT-REQUIRED header)
properties:
x402Version:
type: integer
error:
type: string
code:
type: string
resource:
type: object
accepts:
type: array
items:
type: object
extensions:
type: object
'502':
description: Upstream failure; the payment is released or not settled
content:
application/json:
schema:
type: object
properties:
error:
type: string
code:
type: string
tags:
- Workflow Transition
components:
securitySchemes:
x402:
type: apiKey
in: header
name: PAYMENT-SIGNATURE
description: x402 v2 payment payload (base64) sent after a 402 challenge
apiKey:
type: apiKey
in: header
name: X-API-KEY