{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://hermes.bstein.dev/contracts/hux/v1/event.schema.json",
  "title": "HUX activity event",
  "description": "One entry in the per-conversation activity stream (HUX-01). seq is strictly monotonic per conversation; consumers resume with after_seq. Every other HUX record that changes state emits exactly one event.",
  "type": "object",
  "additionalProperties": false,
  "required": ["schema", "id", "seq", "ts", "conversation_id", "kind", "summary", "provenance", "sensitivity", "redaction"],
  "properties": {
    "schema": {"const": "hux.event.v1"},
    "id": {"$ref": "common.schema.json#/$defs/id"},
    "seq": {"type": "integer", "minimum": 0},
    "ts": {"$ref": "common.schema.json#/$defs/timestamp"},
    "conversation_id": {"$ref": "common.schema.json#/$defs/id"},
    "run_id": {"type": "string", "maxLength": 120},
    "parent_event_id": {"$ref": "common.schema.json#/$defs/id"},
    "correlation_id": {"type": "string", "maxLength": 120},
    "kind": {
      "type": "string",
      "enum": [
        "message.user", "message.assistant",
        "decision.route", "decision.plan",
        "tool.call", "tool.result",
        "approval.requested", "approval.resolved",
        "memory.proposed", "memory.committed", "memory.forgotten",
        "artifact.created", "artifact.version", "artifact.promoted",
        "citation.attached",
        "mode.changed",
        "run.started", "run.cancelled", "run.completed", "run.failed",
        "privacy.notice",
        "suggestion.shown", "suggestion.dismissed",
        "release.transition"
      ]
    },
    "summary": {"type": "string", "minLength": 1, "maxLength": 280},
    "detail": {"type": "object", "description": "Kind-specific payload. Redacted according to redaction.level before leaving the tenant."},
    "evidence": {"type": "array", "maxItems": 64, "items": {"$ref": "common.schema.json#/$defs/evidence_ref"}},
    "provenance": {"$ref": "common.schema.json#/$defs/provenance"},
    "sensitivity": {"$ref": "common.schema.json#/$defs/sensitivity"},
    "redaction": {"$ref": "common.schema.json#/$defs/redaction"}
  }
}