{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://itlackey.github.io/akm/schemas/akm-asset-envelope.json",
  "title": "AKM Markdown Asset Envelope",
  "description": "The common frontmatter envelope every AKM markdown asset type carries: type/description/tags/when_to_use/xrefs/updated/timestamp, plus the OKF v0.2 machine-stamped families (generated/verified/provenance/status/stale_after). Per-type schemas (e.g. akm-workflow.json) $ref these definitions individually into their own top-level `properties` so `additionalProperties: false` still sees them declared locally (JSON Schema does not merge `allOf` siblings' properties for that check). This file has no `properties`/`required` of its own — it is a definitions-only library.",
  "definitions": {
    "type": {
      "type": "string",
      "minLength": 1,
      "description": "The asset's type token (e.g. \"workflow\"). Drives recognition alongside directory residence."
    },
    "description": {
      "type": "string",
      "description": "Human-readable summary of the asset."
    },
    "tags": {
      "type": "array",
      "items": { "type": "string", "minLength": 1 },
      "description": "Free-form search/classification tags."
    },
    "when_to_use": {
      "type": "string",
      "description": "Guidance on when this asset should be applied/selected."
    },
    "xrefs": {
      "type": "array",
      "items": { "type": "string", "minLength": 1 },
      "description": "Canonical asset refs this asset cross-references. Ref canonicality is checked by semantic validation, not this schema."
    },
    "updated": {
      "type": "string",
      "description": "Last-updated timestamp (author-maintained)."
    },
    "timestamp": {
      "type": "string",
      "description": "Legacy creation/authoring timestamp, pre-dating OKF v0.2's `generated:`."
    },
    "actorStamp": {
      "type": "object",
      "additionalProperties": false,
      "required": ["by"],
      "properties": {
        "by": { "type": "string", "minLength": 1 },
        "at": { "type": "string" }
      },
      "description": "One OKF v0.2 actor stamp: who (by) and, usually, when (at)."
    },
    "generated": {
      "$ref": "#/definitions/actorStamp",
      "description": "OKF v0.2 machine-stamped authorship — the replacement for the legacy `timestamp` key."
    },
    "verified": {
      "anyOf": [
        { "$ref": "#/definitions/actorStamp" },
        { "type": "array", "items": { "$ref": "#/definitions/actorStamp" } }
      ],
      "description": "OKF v0.2 machine-stamped verification(s). A bare mapping or a list of them; independent confirmations accumulate."
    },
    "provenanceSource": {
      "type": "object",
      "required": ["resource"],
      "additionalProperties": true,
      "properties": {
        "resource": { "type": "string", "minLength": 1 },
        "id": { "type": "string" },
        "title": { "type": "string" },
        "author": { "type": "string" },
        "usage_count": { "type": "number" },
        "last_modified": { "type": "string" }
      }
    },
    "provenance": {
      "type": "object",
      "additionalProperties": true,
      "properties": {
        "sources": {
          "type": "array",
          "items": { "$ref": "#/definitions/provenanceSource" }
        }
      },
      "description": "Namespaced OKF v0.2 provenance (kept nested because a bare top-level `sources:` collides with the AKM-native wiki citation-string convention)."
    },
    "status": {
      "enum": ["draft", "stable", "deprecated"],
      "description": "OKF v0.2 lifecycle status."
    },
    "stale_after": {
      "type": "string",
      "minLength": 1,
      "description": "OKF v0.2 staleness horizon (a date or duration, author-maintained)."
    }
  }
}