{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/serverless/refs/heads/main/json-schema/serverless-invocation-schema.json",
  "title": "ServerlessInvocation",
  "description": "Represents a single invocation of a serverless function, including execution metadata such as cold start, duration, and result status.",
  "type": "object",
  "properties": {
    "invocation_id": {
      "type": "string",
      "description": "Platform-assigned unique identifier for this invocation, often the request ID or trace ID.",
      "example": "5f1c8b30-9b54-4e3e-a5a4-9b1a55c0a2f8"
    },
    "function_name": {
      "type": "string",
      "description": "Name of the function that was invoked.",
      "example": "process-stripe-webhook"
    },
    "platform": {
      "type": "string",
      "description": "Serverless platform on which the invocation ran.",
      "example": "aws-lambda"
    },
    "trigger_type": {
      "type": "string",
      "description": "Type of trigger that produced this invocation.",
      "enum": [
        "http",
        "function-url",
        "schedule",
        "queue",
        "topic",
        "object-storage",
        "database",
        "stream",
        "webhook",
        "event-bus",
        "manual"
      ],
      "example": "http"
    },
    "started_at": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the invocation started.",
      "example": "2026-05-19T14:23:01.123Z"
    },
    "duration_ms": {
      "type": "number",
      "description": "Wall-clock execution duration in milliseconds.",
      "minimum": 0,
      "example": 142.7
    },
    "billed_duration_ms": {
      "type": "number",
      "description": "Billed duration in milliseconds, rounded up by the platform's billing granularity.",
      "minimum": 0,
      "example": 143
    },
    "memory_used_mb": {
      "type": "integer",
      "description": "Peak memory consumption observed during the invocation, in megabytes.",
      "minimum": 0,
      "example": 96
    },
    "cold_start": {
      "type": "boolean",
      "description": "Whether this invocation incurred a cold start (new runtime container or isolate initialization).",
      "example": false
    },
    "init_duration_ms": {
      "type": "number",
      "description": "Initialization time for cold starts, in milliseconds. Zero or null for warm invocations.",
      "minimum": 0,
      "example": 0
    },
    "status": {
      "type": "string",
      "description": "Result status of the invocation.",
      "enum": ["success", "handled-error", "unhandled-error", "timeout", "throttled", "out-of-memory"],
      "example": "success"
    },
    "status_code": {
      "type": "integer",
      "description": "HTTP-style status code returned to the caller, when applicable.",
      "example": 200
    },
    "error": {
      "type": "object",
      "description": "Error information if the invocation failed.",
      "properties": {
        "type": { "type": "string", "example": "TimeoutError" },
        "message": { "type": "string", "example": "Function execution timed out after 30s" }
      }
    },
    "region": {
      "type": "string",
      "description": "Region or edge POP where the invocation executed.",
      "example": "iad1"
    },
    "trace_id": {
      "type": "string",
      "description": "Distributed tracing identifier propagated from the caller.",
      "example": "1-65ff0c10-1a2b3c4d5e6f7890"
    }
  },
  "required": ["invocation_id", "function_name", "platform", "started_at", "duration_ms", "status"]
}