{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "triangle.schema.json",
  "title": "Triangle Definition",
  "description": "3-NPC relationship triangle — self-contained forks, no cross-triangle cascade in v0.1 (D-024, D-047).",
  "type": "object",
  "required": ["canonical_id", "display_name", "members"],
  "additionalProperties": false,
  "properties": {
    "canonical_id": {
      "type": "string",
      "pattern": "^[a-z][a-z0-9-]*$",
      "description": "Triangle slug"
    },
    "display_name": {
      "type": "string",
      "minLength": 1
    },
    "description": {
      "type": "string"
    },
    "members": {
      "type": "array",
      "items": { "$ref": "#/$defs/member" },
      "minItems": 3,
      "maxItems": 3,
      "description": "Exactly 3 NPC members"
    },
    "forks": {
      "type": "array",
      "items": { "$ref": "#/$defs/fork" },
      "description": "Possible fork points in this triangle"
    },
    "resolution_states": {
      "type": "array",
      "items": { "$ref": "#/$defs/resolution" },
      "description": "Terminal states this triangle can reach"
    }
  },
  "$defs": {
    "member": {
      "type": "object",
      "required": ["npc", "role"],
      "additionalProperties": false,
      "properties": {
        "npc": {
          "type": "string",
          "pattern": "^npc:[a-z][a-z0-9-]*$",
          "description": "NPC short-form canonical ID"
        },
        "role": {
          "type": "string",
          "description": "This NPC's role within the triangle"
        }
      }
    },
    "fork": {
      "type": "object",
      "required": ["id", "condition"],
      "additionalProperties": false,
      "properties": {
        "id": {
          "type": "string",
          "pattern": "^[a-z][a-z0-9_-]*$"
        },
        "condition": {
          "type": "string",
          "description": "What triggers this fork"
        },
        "outcomes": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "id": { "type": "string" },
              "description": { "type": "string" },
              "effects": {
                "type": "array",
                "items": { "type": "string" }
              }
            }
          }
        }
      }
    },
    "resolution": {
      "type": "object",
      "required": ["id", "description"],
      "additionalProperties": false,
      "properties": {
        "id": {
          "type": "string",
          "pattern": "^[a-z][a-z0-9_-]*$"
        },
        "description": { "type": "string" }
      }
    }
  }
}