{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://git.benstull.org/benstull/vscode-cowriting-plugin/schemas/coauthoring-sidecar.schema.json",
  "title": "Coauthoring sidecar artifact — cross-rung contract, schemaVersion 1",
  "description": "Machine-checkable half of the cross-rung contract (vscode-cowriting-plugin-content/specs/coauthoring-sidecar-contract.md — the prose contract is normative, INV-14). Unknown fields are deliberately allowed at every level: minor versions are additive and conforming writers preserve fields they do not recognize (INV-15/INV-16).",
  "type": "object",
  "required": ["schemaVersion", "document", "anchors", "threads", "attributions", "proposals"],
  "properties": {
    "schemaVersion": { "type": "integer", "minimum": 1 },
    "document": {
      "type": "object",
      "required": ["path"],
      "properties": { "path": { "type": "string", "minLength": 1 } }
    },
    "anchors": {
      "type": "object",
      "additionalProperties": { "$ref": "#/$defs/anchor" }
    },
    "threads": { "type": "array", "items": { "$ref": "#/$defs/thread" } },
    "attributions": { "type": "array", "items": { "$ref": "#/$defs/attribution" } },
    "proposals": { "type": "array", "items": { "$ref": "#/$defs/proposal" } }
  },
  "$defs": {
    "fingerprint": {
      "type": "object",
      "required": ["text", "before", "after", "lineHint"],
      "properties": {
        "text": { "type": "string" },
        "before": { "type": "string" },
        "after": { "type": "string" },
        "lineHint": { "type": "integer", "minimum": 0 }
      }
    },
    "anchor": {
      "type": "object",
      "required": ["fingerprint"],
      "properties": { "fingerprint": { "$ref": "#/$defs/fingerprint" } }
    },
    "onBehalfOf": {
      "type": "object",
      "required": ["id"],
      "properties": { "id": { "type": "string" }, "email": { "type": "string" } }
    },
    "agentPayload": {
      "type": "object",
      "required": ["sdk", "model", "sessionId"],
      "properties": {
        "sdk": { "type": "string" },
        "model": { "type": "string" },
        "sessionId": { "type": "string" },
        "onBehalfOf": { "$ref": "#/$defs/onBehalfOf" }
      }
    },
    "provenance": {
      "type": "object",
      "required": ["kind", "id"],
      "properties": {
        "kind": { "enum": ["human", "agent"] },
        "id": { "type": "string" },
        "email": { "type": "string" },
        "agent": { "$ref": "#/$defs/agentPayload" }
      },
      "if": { "properties": { "kind": { "const": "agent" } } },
      "then": { "required": ["kind", "id", "agent"] }
    },
    "message": {
      "type": "object",
      "required": ["id", "author", "body", "createdAt"],
      "properties": {
        "id": { "type": "string" },
        "author": { "$ref": "#/$defs/provenance" },
        "body": { "type": "string" },
        "createdAt": { "type": "string" }
      }
    },
    "thread": {
      "type": "object",
      "required": ["id", "anchorId", "status", "messages"],
      "properties": {
        "id": { "type": "string" },
        "anchorId": { "type": "string" },
        "status": { "enum": ["open", "resolved"] },
        "messages": { "type": "array", "items": { "$ref": "#/$defs/message" } }
      }
    },
    "attribution": {
      "type": "object",
      "required": ["id", "anchorId", "author", "createdAt", "updatedAt"],
      "properties": {
        "id": { "type": "string" },
        "anchorId": { "type": "string" },
        "author": { "$ref": "#/$defs/provenance" },
        "createdAt": { "type": "string" },
        "updatedAt": { "type": "string" },
        "turnId": { "type": "string" }
      }
    },
    "proposal": {
      "type": "object",
      "required": ["id", "anchorId", "replacement", "author", "createdAt"],
      "properties": {
        "id": { "type": "string" },
        "anchorId": { "type": "string" },
        "replacement": { "type": "string" },
        "author": { "$ref": "#/$defs/provenance" },
        "createdAt": { "type": "string" },
        "turnId": { "type": "string" },
        "instruction": { "type": "string" }
      }
    }
  }
}