{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://thinkloom.app/schemas/provenance/1.0/transcript-turn.schema.json",
  "title": "Transcript turn",
  "description": "Immutable retained conversation turn permitted by project policy.",
  "type": "object",
  "properties": {
    "schema_version": {
      "const": "1.0"
    },
    "turn_id": {
      "type": "string",
      "pattern": "^turn_[0-9A-HJKMNP-TV-Z]{26}$"
    },
    "session_id": {
      "type": "string",
      "pattern": "^session_[0-9A-HJKMNP-TV-Z]{26}$"
    },
    "speaker": {
      "enum": [
        "user",
        "assistant"
      ]
    },
    "input_mode": {
      "enum": [
        "typed",
        "voice"
      ]
    },
    "retained_text": {
      "type": "string",
      "minLength": 1
    },
    "raw_transcript": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ]
    },
    "started_at": {
      "type": "string",
      "format": "date-time",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d{3}Z$"
    },
    "ended_at": {
      "type": "string",
      "format": "date-time",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d{3}Z$"
    },
    "audio_retained": {
      "const": false
    },
    "invocation_id": {
      "anyOf": [
        {
          "type": "string",
          "pattern": "^invocation_[0-9A-HJKMNP-TV-Z]{26}$"
        },
        {
          "type": "null"
        }
      ]
    },
    "event_id": {
      "type": "string",
      "pattern": "^event_[0-9A-HJKMNP-TV-Z]{26}$"
    }
  },
  "required": [
    "schema_version",
    "turn_id",
    "session_id",
    "speaker",
    "input_mode",
    "retained_text",
    "raw_transcript",
    "started_at",
    "ended_at",
    "audio_retained",
    "invocation_id",
    "event_id"
  ],
  "additionalProperties": false,
  "examples": [
    {
      "schema_version": "1.0",
      "turn_id": "turn_01J00000000000000000000007",
      "session_id": "session_01J00000000000000000000006",
      "speaker": "user",
      "input_mode": "typed",
      "retained_text": "Attention shapes public life.",
      "raw_transcript": null,
      "started_at": "2026-07-17T18:42:10.123Z",
      "ended_at": "2026-07-17T18:43:11.456Z",
      "audio_retained": false,
      "invocation_id": null,
      "event_id": "event_01J00000000000000000000003"
    }
  ]
}