The Mutation Intent API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for mutation intent.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Mutation Intent 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: Mutation Intent
paths:
/api/v1/mutation-intent:
post:
operationId: mutation_intent
summary: Diff a before/after JSON write for deletes, null-vs-omit and emptied arrays…
description: 'Compares the JSON document an agent read (before) with the one it is about to write (after) and lists every change by JSON Pointer: removed members, null turned into omitted (and the reverse), arrays emptied or shrunk, objects emptied, type changes. Fails when a change touches a protected path or is destructive and not listed in allowDestructive; use it before a PUT, PATCH or bulk update. Arrays are compared by index, so a reorder shows as element changes. Does not know the API''s semantics for omitted fields (use update-dialect) and does not judge whether a non-destructive change is wanted.
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/mutation-intent
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- before
- after
properties:
before:
description: JSON value as last read.
after:
description: JSON value about to be written.
protectedPaths:
type: array
maxItems: 100
items:
type: string
maxLength: 300
description: JSON Pointers that must not change at all; a "*" token matches any one key or index.
allowDestructive:
type: array
maxItems: 100
items:
type: string
maxLength: 300
description: JSON Pointers ("*" wildcard) under which deletes, emptied containers and type changes are intended.
example:
before:
name: Ada
tags:
- a
- b
phone: null
after:
name: Ada
tags: []
protectedPaths:
- /name
allowDestructive: []
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.'
changes:
type: array
description: At most 200 changes in document order.
items:
type: object
properties:
path:
type: string
kind:
type: string
enum:
- added
- removed
- changed
- type-changed
- null-to-omitted
- omitted-to-null
- array-emptied
- array-shrunk
- array-grown
- object-emptied
destructive:
type: boolean
before:
description: Clipped to 200 characters.
after:
description: Clipped to 200 characters.
protected:
type: boolean
allowed:
type: boolean
changeCount:
type: integer
description: Total changes found, which can exceed the number listed.
truncated:
type: boolean
protectedHits:
type: integer
unintendedDestructive:
type: integer
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:
- Mutation Intent
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