# Provenance Manifests Schema Directionality Checker

> Provenance Manifests Schema Directionality Checker is a paid API for AI agents from www.mahastrategies.com, paid per call via x402, $0.035115/call, status unknown (last checked 2026-10-20).

Compares two versions of provenance manifest field declarations to detect removed properties, changed scalar types, or weakened required/non-null guarantees that would break downstream readers.

## Facts

- Endpoint: POST https://www.mahastrategies.com/api/v1/verify/provenance-manifests/schema-directionality?utm_source=zero.xyz
- Price: $0.035115/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/provenance-manifests-schema-directionality-checker-4d5fd05e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pL9PVB7m0Om_GWezkFmOE

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability provenance-manifests-schema-directionality-checker-4d5fd05e -d '<json body>'
```

Example prompt: Check whether my updated provenance manifest schema is safe for existing readers — the before schema has these fields and the after schema has these fields, data class is 'public', nonpersonal metadata is true, and consumers do not allow extra fields.

## When to prefer this

Choose this endpoint when you need a deterministic, typed, offline comparison of two provenance manifest schema versions specifically for artifact or dataset metadata — particularly when you need to enforce closed export-field guarantees and detect breaking changes (removed fields, type regressions, weakened constraints) before deploying a schema update. Prefer this over generic schema diff tools when your use case involves caller-supplied provenance manifests with nonpersonal metadata constraints and you need an authoritative directionality verdict without any source download, signature verification, or build reproduction side effects.

## Known failure modes

- Before array is empty or missing (minItems:1 violated) — request rejected with validation error
- After or before arrays exceed 32 items — request rejected
- dataClass value outside 'public' or 'synthetic' enum — request rejected
- nonpersonalMetadata not set to true (const:true) — request rejected
- Malformed field descriptor objects in before/after arrays — validation error returned
- Result unavailable after 24-hour retention window — stale result error

## How this service works

Compare closed export-field guarantees. Removing fields, changing types or weakening required/non-null promises breaks the declared reader; extra fields depend on its explicit strictness for caller-supplied artifact and dataset provenance manifests. No source download, build reproduction, signature verification, proof of origin, causality or scientific validity. Offline typed nonpersonal metadata only. Result retention: 24 hours; minimal receipt metadata: 90 days.

## Output

Returns a structured comparison report identifying removed export fields, changed scalar types, and weakened required or non-null guarantees between the before and after provenance manifest schemas, along with a directionality verdict indicating whether the schema change is backward compatible for declared readers. Results are retained for 24 hours; minimal receipt metadata is retained for 90 days.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "after": {
   "type": "array",
   "maxItems": 32,
   "minItems": 0
  },
  "before": {
   "type": "array",
   "maxItems": 32,
   "minItems": 1
  },
  "dataClass": {
   "enum": [
    "public",
    "synthetic"
   ],
   "type": "string"
  },
  "nonpersonalMetadata": {
   "type": "boolean",
   "const": true
  },
  "consumerAllowsExtraFields": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/provenance-manifests-schema-directionality-checker-4d5fd05e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.mahastrategies.com](https://www.zero.xyz/host/www.mahastrategies.com/llms.txt)