{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Issue Execution Queue Schema",
  "description": "Global execution queue for all issue tasks",
  "type": "object",
  "properties": {
    "queue": {
      "type": "array",
      "description": "Ordered list of tasks to execute",
      "items": {
        "type": "object",
        "required": ["item_id", "issue_id", "solution_id", "task_id", "status"],
        "properties": {
          "item_id": {
            "type": "string",
            "pattern": "^T-[0-9]+$",
            "description": "Unique queue item identifier"
          },
          "issue_id": {
            "type": "string",
            "description": "Source issue ID"
          },
          "solution_id": {
            "type": "string",
            "description": "Source solution ID"
          },
          "task_id": {
            "type": "string",
            "description": "Task ID within solution"
          },
          "status": {
            "type": "string",
            "enum": ["pending", "ready", "executing", "completed", "failed", "blocked"],
            "default": "pending"
          },
          "execution_order": {
            "type": "integer",
            "description": "Order in execution sequence"
          },
          "execution_group": {
            "type": "string",
            "description": "Parallel execution group ID (e.g., P1, S1)"
          },
          "depends_on": {
            "type": "array",
            "items": { "type": "string" },
            "description": "Queue IDs this task depends on"
          },
          "semantic_priority": {
            "type": "number",
            "minimum": 0,
            "maximum": 1,
            "description": "Semantic importance score (0.0-1.0)"
          },
          "assigned_executor": {
            "type": "string",
            "enum": ["codex", "gemini", "agent"]
          },
          "queued_at": {
            "type": "string",
            "format": "date-time"
          },
          "started_at": {
            "type": "string",
            "format": "date-time"
          },
          "completed_at": {
            "type": "string",
            "format": "date-time"
          },
          "result": {
            "type": "object",
            "description": "Execution result",
            "properties": {
              "files_modified": { "type": "array", "items": { "type": "string" } },
              "files_created": { "type": "array", "items": { "type": "string" } },
              "summary": { "type": "string" },
              "commit_hash": { "type": "string" }
            }
          },
          "failure_reason": {
            "type": "string"
          }
        }
      }
    },
    "conflicts": {
      "type": "array",
      "description": "Detected conflicts between tasks",
      "items": {
        "type": "object",
        "properties": {
          "type": {
            "type": "string",
            "enum": ["file_conflict", "dependency_conflict", "resource_conflict"]
          },
          "tasks": {
            "type": "array",
            "items": { "type": "string" },
            "description": "Queue IDs involved in conflict"
          },
          "file": {
            "type": "string",
            "description": "Conflicting file path"
          },
          "resolution": {
            "type": "string",
            "enum": ["sequential", "merge", "manual"]
          },
          "resolution_order": {
            "type": "array",
            "items": { "type": "string" }
          },
          "resolved": {
            "type": "boolean",
            "default": false
          }
        }
      }
    },
    "_metadata": {
      "type": "object",
      "properties": {
        "version": { "type": "string", "default": "1.0" },
        "total_items": { "type": "integer" },
        "pending_count": { "type": "integer" },
        "ready_count": { "type": "integer" },
        "executing_count": { "type": "integer" },
        "completed_count": { "type": "integer" },
        "failed_count": { "type": "integer" },
        "last_queue_formation": { "type": "string", "format": "date-time" },
        "last_updated": { "type": "string", "format": "date-time" }
      }
    }
  }
}