{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://github.com/LucioLiu/handoff-protocol/contracts/handoff-packet.schema.json",
  "title": "Handoff packet",
  "type": "object",
  "additionalProperties": false,
  "required": ["goal", "context_constraints", "acceptance_criteria", "known_pitfalls"],
  "properties": {
    "goal": {"type": "string", "minLength": 1},
    "context_constraints": {"type": "array", "minItems": 1, "items": {"type": "string", "minLength": 1}},
    "acceptance_criteria": {"type": "array", "minItems": 1, "items": {"type": "string", "minLength": 1}},
    "known_pitfalls": {"type": "array", "items": {"type": "string", "minLength": 1}},
    "handoff_id": {"type": "string", "minLength": 1},
    "execution_mode": {
      "description": "Host execution container only. Durable writes are governed separately by persistence_contract.",
      "enum": ["bounded_subagent", "independent_task"],
      "default": "bounded_subagent"
    },
    "continuity_required": {"type": "boolean", "default": false},
    "allow_mode_degradation": {"type": "boolean", "default": false},
    "persistence_contract": {
      "description": "Durable artifact obligations, orthogonal to execution_mode. A bounded_subagent may carry required targets.",
      "$ref": "persistence-contract.schema.json"
    }
  },
  "allOf": [
    {
      "if": {
        "properties": {"execution_mode": {"const": "independent_task"}},
        "required": ["execution_mode"]
      },
      "then": {"required": ["persistence_contract"]}
    },
    {
      "if": {
        "properties": {"continuity_required": {"const": true}},
        "required": ["continuity_required"]
      },
      "then": {
        "properties": {"execution_mode": {"const": "independent_task"}},
        "required": ["execution_mode", "handoff_id"]
      }
    },
    {
      "if": {"required": ["persistence_contract"]},
      "then": {"required": ["handoff_id"]}
    }
  ]
}