{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/restate/refs/heads/main/json-schema/restate-invocation-schema.json",
  "title": "Invocation",
  "description": "Represents a Restate durable invocation — an in-flight or completed call to a service handler with exactly-once execution semantics.",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique identifier for the invocation."
    },
    "target": {
      "type": "string",
      "description": "The fully qualified target in format ServiceName/handlerName or ServiceName/key/handlerName."
    },
    "target_service_name": {
      "type": "string",
      "description": "The name of the target service."
    },
    "target_handler_name": {
      "type": "string",
      "description": "The name of the target handler."
    },
    "target_service_key": {
      "type": ["string", "null"],
      "description": "The virtual object key (null for plain services)."
    },
    "status": {
      "type": "string",
      "description": "Current execution status of the invocation.",
      "enum": ["pending", "ready", "running", "backing-off", "suspended", "completed"]
    },
    "created_at": {
      "type": "string",
      "format": "date-time",
      "description": "ISO 8601 timestamp when the invocation was created."
    },
    "modified_at": {
      "type": "string",
      "format": "date-time",
      "description": "ISO 8601 timestamp when the invocation status last changed."
    },
    "trace_id": {
      "type": "string",
      "description": "Distributed trace identifier for observability."
    },
    "deployment_id": {
      "type": "string",
      "description": "The deployment that is handling this invocation."
    },
    "retry_count": {
      "type": "integer",
      "minimum": 0,
      "description": "Number of times this invocation has been retried."
    },
    "last_failure": {
      "type": ["string", "null"],
      "description": "Description of the last failure that caused a retry."
    },
    "next_retry_at": {
      "type": ["string", "null"],
      "format": "date-time",
      "description": "ISO 8601 timestamp for when the next retry will occur."
    }
  },
  "required": ["id", "target", "status"]
}