{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://wendkeep.dev/schema/handoff-contract-v1.schema.json",
  "title": "WendKeep Handoff Contract v1",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema_version", "handoff_id", "from", "to", "active_context_id", "task_id",
    "task_contract_id", "artifacts", "evidence", "decisions", "next_actions", "blockers",
    "head_sha", "tasks_sha256", "spec_sha256", "authority"
  ],
  "properties": {
    "schema_version": { "const": 1 },
    "handoff_id": { "type": "string", "pattern": "^[a-f0-9]{64}$" },
    "from": { "type": "string", "minLength": 1 },
    "to": { "type": "string", "minLength": 1 },
    "active_context_id": { "type": "string", "minLength": 1 },
    "task_id": { "type": "string" },
    "task_contract_id": { "type": "string" },
    "artifacts": { "$ref": "#/$defs/stringArray" },
    "evidence": { "$ref": "#/$defs/stringArray" },
    "decisions": { "$ref": "#/$defs/stringArray" },
    "next_actions": { "$ref": "#/$defs/stringArray" },
    "blockers": { "$ref": "#/$defs/stringArray" },
    "tdd_attestation_ids": { "$ref": "#/$defs/stringArray" },
    "head_sha": { "type": "string", "minLength": 1 },
    "tasks_sha256": { "type": "string", "minLength": 1 },
    "spec_sha256": { "type": "string", "minLength": 1 },
    "host_coverage": { "$ref": "host-coverage-v1.schema.json" },
    "coverage_findings": { "type": "array", "items": { "type": "object" } },
    "coverage_waivers": { "type": "array", "items": { "type": "object" } },
    "authority": { "enum": ["verified", "reported"] }
  },
  "$defs": {
    "stringArray": {
      "type": "array",
      "items": { "type": "string" },
      "uniqueItems": true
    }
  }
}