{
  "$comment": "MPLP Protocol v1.0.0 — Frozen Specification\nFreeze Date: 2025-12-03\nStatus: FROZEN (no breaking changes permitted)\nGovernance: MPLP Protocol Governance Committee (MPGC)\nCopyright: © 2026 Jearon Wong\nLicense: Apache-2.0\nAny normative change requires a new protocol version.",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://schemas.mplp.dev/v1.0/mplp-trace.schema.json",
  "title": "MPLP Trace Module – Core Protocol v1.0",
  "description": "Trace Module Core Protocol: Describes the minimal required semantics (Core Profile) for execution trace resources (Trace) and their key segments and events.",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "meta": {
      "$ref": "common/metadata.schema.json",
      "description": "[PROTOCOL-CORE] MPLP protocol and schema metadata."
    },
    "governance": {
      "type": "object",
      "description": "[PROTOCOL-CORE] Governance metadata for lifecycle management, truth domain authority, and locking status.",
      "properties": {
        "lifecyclePhase": {
          "type": "string",
          "description": "Current phase in the lifecycle fence (e.g., 'design', 'implementation', 'review')."
        },
        "truthDomain": {
          "type": "string",
          "description": "The truth domain this object belongs to (e.g., 'requirements', 'architecture')."
        },
        "locked": {
          "type": "boolean",
          "description": "If true, this object cannot be modified except by specific governance overrides."
        },
        "lastConfirmRef": {
          "$ref": "common/common-types.schema.json#/definitions/Ref",
          "description": "Reference to the last Confirm decision that validated this state."
        }
      },
      "additionalProperties": false
    },
    "trace_id": {
      "$ref": "common/identifiers.schema.json",
      "description": "[PROTOCOL-CORE] Global unique identifier for the Trace."
    },
    "context_id": {
      "$ref": "common/identifiers.schema.json",
      "description": "[PROTOCOL-CORE] Identifier of the Context this Trace belongs to."
    },
    "plan_id": {
      "$ref": "common/identifiers.schema.json",
      "description": "[PROTOCOL-CORE] Identifier of the Plan associated with this Trace (if any)."
    },
    "root_span": {
      "$ref": "common/trace-base.schema.json",
      "description": "[PROTOCOL-CORE] Root span definition of the Trace (follows L1 trace-base structure)."
    },
    "status": {
      "type": "string",
      "description": "[PROTOCOL-CORE] Current status of the Trace.",
      "enum": [
        "pending",
        "running",
        "completed",
        "failed",
        "cancelled"
      ]
    },
    "started_at": {
      "type": "string",
      "format": "date-time",
      "description": "[PROTOCOL-CORE] Trace start time (ISO 8601)."
    },
    "finished_at": {
      "type": "string",
      "format": "date-time",
      "description": "[PROTOCOL-CORE] Trace finish time (ISO 8601, optional if not finished)."
    },
    "segments": {
      "type": "array",
      "description": "[PROTOCOL-CORE] Key execution segments in the Trace (can correspond to multiple spans or phased aggregations).",
      "items": {
        "$ref": "#/$defs/trace_segment_core"
      }
    },
    "events": {
      "type": "array",
      "description": "[PROTOCOL-CORE] List of events directly related to this Trace (errors, retries, status changes, etc.).",
      "items": {
        "$ref": "common/events.schema.json"
      }
    }
  },
  "required": [
    "meta",
    "trace_id",
    "context_id",
    "root_span",
    "status"
  ],
  "$defs": {
    "trace_core_properties": {
      "type": "object",
      "properties": {
        "meta": {
          "$ref": "common/metadata.schema.json",
          "description": "[PROTOCOL-CORE] MPLP protocol and schema metadata."
        },
        "trace_id": {
          "$ref": "common/identifiers.schema.json",
          "description": "[PROTOCOL-CORE] Global unique identifier for the Trace."
        },
        "context_id": {
          "$ref": "common/identifiers.schema.json",
          "description": "[PROTOCOL-CORE] Identifier of the Context this Trace belongs to."
        },
        "plan_id": {
          "$ref": "common/identifiers.schema.json",
          "description": "[PROTOCOL-CORE] Identifier of the Plan associated with this Trace (if any)."
        },
        "root_span": {
          "$ref": "common/trace-base.schema.json",
          "description": "[PROTOCOL-CORE] Root span definition of the Trace (follows L1 trace-base structure)."
        },
        "status": {
          "type": "string",
          "description": "[PROTOCOL-CORE] Current status of the Trace.",
          "enum": [
            "pending",
            "running",
            "completed",
            "failed",
            "cancelled"
          ]
        },
        "started_at": {
          "type": "string",
          "format": "date-time",
          "description": "[PROTOCOL-CORE] Trace start time (ISO 8601)."
        },
        "finished_at": {
          "type": "string",
          "format": "date-time",
          "description": "[PROTOCOL-CORE] Trace finish time (ISO 8601, optional if not finished)."
        },
        "segments": {
          "type": "array",
          "description": "[PROTOCOL-CORE] Key execution segments in the Trace (can correspond to multiple spans or phased aggregations).",
          "items": {
            "$ref": "#/$defs/trace_segment_core"
          }
        },
        "events": {
          "type": "array",
          "description": "[PROTOCOL-CORE] List of events directly related to this Trace (errors, retries, status changes, etc.).",
          "items": {
            "$ref": "common/events.schema.json"
          }
        }
      },
      "required": [
        "meta",
        "trace_id",
        "context_id",
        "root_span",
        "status"
      ]
    },
    "trace_segment_core": {
      "type": "object",
      "description": "[PROTOCOL-CORE] Key segments in execution tracing, used to express an auditable execution interval at the protocol layer.",
      "additionalProperties": false,
      "properties": {
        "segment_id": {
          "$ref": "common/identifiers.schema.json",
          "description": "[PROTOCOL-CORE] Segment identifier."
        },
        "parent_segment_id": {
          "$ref": "common/identifiers.schema.json",
          "description": "[PROTOCOL-CORE] Parent segment identifier (optional if root segment)."
        },
        "label": {
          "type": "string",
          "description": "[PROTOCOL-CORE] Segment label/name, for human and Agent identification of the interval."
        },
        "status": {
          "type": "string",
          "description": "[PROTOCOL-CORE] Segment status.",
          "enum": [
            "pending",
            "running",
            "completed",
            "failed",
            "cancelled",
            "skipped"
          ]
        },
        "started_at": {
          "type": "string",
          "format": "date-time",
          "description": "[PROTOCOL-CORE] Segment start time."
        },
        "finished_at": {
          "type": "string",
          "format": "date-time",
          "description": "[PROTOCOL-CORE] Segment finish time (optional if not finished)."
        },
        "attributes": {
          "type": "object",
          "description": "[PROTOCOL-CORE] Key context attributes related to this segment (key-value form, for tracing and audit).",
          "additionalProperties": true
        }
      },
      "required": [
        "segment_id",
        "label",
        "status"
      ]
    }
  }
}