{
  "contract": "AMDUATD/API/2",
  "base_path": "/v2",
  "notes": "Draft v2: PEL-only write surface. Direct artifact write endpoint removed.",
  "endpoints": [
    {"method": "GET", "path": "/v2/meta"},
    {"method": "HEAD", "path": "/v2/meta"},
    {"method": "GET", "path": "/v2/contract"},
    {"method": "GET", "path": "/v2/healthz"},
    {"method": "GET", "path": "/v2/readyz"},
    {"method": "GET", "path": "/v2/metrics"},
    {"method": "GET", "path": "/v2/artifacts/{ref}"},
    {"method": "HEAD", "path": "/v2/artifacts/{ref}"},
    {"method": "GET", "path": "/v2/artifacts/{ref}?format=info"},
    {"method": "POST", "path": "/v2/pel/execute"},
    {"method": "POST", "path": "/v2/ops/put"},
    {"method": "POST", "path": "/v2/ops/concat"},
    {"method": "POST", "path": "/v2/ops/slice"},
    {"method": "GET", "path": "/v2/jobs/{id}"},
    {"method": "GET", "path": "/v2/get/{ref}"},
    {"method": "POST", "path": "/v2/graph/nodes"},
    {"method": "POST", "path": "/v2/graph/nodes/{name}/versions"},
    {"method": "POST", "path": "/v2/graph/nodes/{name}/versions/tombstone"},
    {"method": "GET", "path": "/v2/graph/nodes/{name}/versions"},
    {"method": "GET", "path": "/v2/graph/nodes/{name}/neighbors"},
    {"method": "GET", "path": "/v2/graph/search"},
    {"method": "GET", "path": "/v2/graph/paths"},
    {"method": "GET", "path": "/v2/graph/subgraph"},
    {"method": "POST", "path": "/v2/graph/edges"},
    {"method": "POST", "path": "/v2/graph/edges/tombstone"},
    {"method": "POST", "path": "/v2/graph/batch"},
    {"method": "POST", "path": "/v2/graph/query"},
    {"method": "POST", "path": "/v2/graph/retrieve"},
    {"method": "POST", "path": "/v2/graph/export"},
    {"method": "POST", "path": "/v2/graph/import"},
    {"method": "GET", "path": "/v2/graph/schema/predicates"},
    {"method": "POST", "path": "/v2/graph/schema/predicates"},
    {"method": "GET", "path": "/v2/graph/stats"},
    {"method": "GET", "path": "/v2/graph/capabilities"},
    {"method": "GET", "path": "/v2/graph/changes"},
    {"method": "GET", "path": "/v2/graph/edges"},
    {"method": "GET", "path": "/v2/graph/nodes/{name}"},
    {"method": "GET", "path": "/v2/graph/history/{name}"}
  ],
  "schemas": {
    "job_enqueue_response": {
      "type": "object",
      "required": ["job_id", "status"],
      "properties": {
        "job_id": {"type": "integer"},
        "status": {"type": "string"}
      }
    },
    "job_status_response": {
      "type": "object",
      "required": ["job_id", "kind", "status", "created_at_ms"],
      "properties": {
        "job_id": {"type": "integer"},
        "kind": {"type": "string"},
        "status": {"type": "string"},
        "created_at_ms": {"type": "integer"},
        "started_at_ms": {"type": ["integer", "null"]},
        "completed_at_ms": {"type": ["integer", "null"]},
        "result_ref": {"type": ["string", "null"]},
        "error": {"type": ["string", "null"]}
      }
    },
    "healthz_response": {
      "type": "object",
      "required": ["ok", "status", "time_ms"],
      "properties": {
        "ok": {"type": "boolean"},
        "status": {"type": "string"},
        "time_ms": {"type": "integer"}
      }
    },
    "readyz_response": {
      "type": "object",
      "required": ["ok", "status", "components"],
      "properties": {
        "ok": {"type": "boolean"},
        "status": {"type": "string"},
        "components": {
          "type": "object",
          "required": ["graph_index", "federation"],
          "properties": {
            "graph_index": {"type": "boolean"},
            "federation": {"type": "boolean"}
          }
        }
      }
    },
    "put_request": {
      "type": "object",
      "required": ["body_hex"],
      "properties": {
        "body_hex": {"type": "string"},
        "type_tag": {"type": "string"}
      }
    },
    "concat_request": {
      "type": "object",
      "required": ["left_ref", "right_ref"],
      "properties": {
        "left_ref": {"type": "string"},
        "right_ref": {"type": "string"}
      }
    },
    "slice_request": {
      "type": "object",
      "required": ["ref", "offset", "length"],
      "properties": {
        "ref": {"type": "string"},
        "offset": {"type": "integer"},
        "length": {"type": "integer"}
      }
    },
    "graph_node_create_request": {
      "type": "object",
      "required": ["name"],
      "properties": {
        "name": {"type": "string"},
        "ref": {"type": "string", "description": "optional initial published ref"}
      }
    },
    "graph_node_create_response": {
      "type": "object",
      "required": ["name", "concept_ref"],
      "properties": {
        "name": {"type": "string"},
        "concept_ref": {"type": "string"}
      }
    },
    "graph_provenance": {
      "type": "object",
      "required": ["source_uri", "extractor", "observed_at", "ingested_at", "trace_id"],
      "properties": {
        "source_uri": {"type": "string"},
        "extractor": {"type": "string"},
        "confidence": {"type": ["string", "number", "integer"]},
        "observed_at": {"type": "integer"},
        "ingested_at": {"type": "integer"},
        "license": {"type": "string"},
        "trace_id": {"type": "string"}
      }
    },
    "graph_edge_create_request": {
      "type": "object",
      "required": ["subject", "predicate", "object"],
      "properties": {
        "subject": {"type": "string", "description": "concept name or hex ref"},
        "predicate": {"type": "string", "description": "relation alias/name or hex ref"},
        "object": {"type": "string", "description": "concept name or hex ref"},
        "metadata_ref": {"type": "string", "description": "optional artifact ref"},
        "provenance": {"$ref": "#/schemas/graph_provenance"}
      }
    },
    "graph_edge_create_response": {
      "type": "object",
      "required": ["subject_ref", "predicate_ref", "object_ref", "edge_ref"],
      "properties": {
        "subject_ref": {"type": "string"},
        "predicate_ref": {"type": "string"},
        "object_ref": {"type": "string"},
        "edge_ref": {"type": "string"},
        "metadata_ref": {"type": "string"}
      }
    },
    "graph_edge_tombstone_request": {
      "type": "object",
      "required": ["edge_ref"],
      "properties": {
        "edge_ref": {"type": "string"},
        "metadata_ref": {"type": "string"},
        "provenance": {"$ref": "#/schemas/graph_provenance"}
      }
    },
    "graph_edge_tombstone_response": {
      "type": "object",
      "required": ["ok", "target_edge_ref", "tombstone_edge_ref"],
      "properties": {
        "ok": {"type": "boolean"},
        "target_edge_ref": {"type": "string"},
        "tombstone_edge_ref": {"type": "string"},
        "metadata_ref": {"type": "string"}
      }
    },
    "graph_node_version_tombstone_request": {
      "type": "object",
      "required": ["ref"],
      "properties": {
        "ref": {"type": "string"},
        "metadata_ref": {"type": "string"},
        "provenance": {"$ref": "#/schemas/graph_provenance"}
      }
    },
    "graph_node_version_tombstone_response": {
      "type": "object",
      "required": ["ok", "name", "ref", "target_edge_ref", "tombstone_edge_ref"],
      "properties": {
        "ok": {"type": "boolean"},
        "name": {"type": "string"},
        "ref": {"type": "string"},
        "target_edge_ref": {"type": "string"},
        "tombstone_edge_ref": {"type": "string"},
        "metadata_ref": {"type": "string"}
      }
    },
    "graph_batch_request": {
      "type": "object",
      "properties": {
        "idempotency_key": {"type": "string"},
        "mode": {"type": "string", "enum": ["fail_fast", "continue_on_error"]},
        "nodes": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["name"],
            "properties": {
              "name": {"type": "string"},
              "ref": {"type": "string"}
            }
          }
        },
        "versions": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["name", "ref"],
            "properties": {
              "name": {"type": "string"},
              "ref": {"type": "string"},
              "metadata_ref": {"type": "string"},
              "provenance": {"$ref": "#/schemas/graph_provenance"}
            }
          }
        },
        "edges": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["subject", "predicate", "object"],
            "properties": {
              "subject": {"type": "string"},
              "predicate": {"type": "string"},
              "object": {"type": "string"},
              "metadata_ref": {"type": "string"},
              "provenance": {"$ref": "#/schemas/graph_provenance"}
            }
          }
        }
      }
    },
    "graph_batch_response": {
      "type": "object",
      "required": ["ok", "applied", "results"],
      "properties": {
        "ok": {"type": "boolean"},
        "idempotency_key": {"type": "string"},
        "mode": {"type": "string", "enum": ["fail_fast", "continue_on_error"]},
        "applied": {
          "type": "object",
          "required": ["nodes", "versions", "edges"],
          "properties": {
            "nodes": {"type": "integer"},
            "versions": {"type": "integer"},
            "edges": {"type": "integer"}
          }
        },
        "results": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["kind", "index", "status", "code", "error"],
            "properties": {
              "kind": {"type": "string", "enum": ["node", "version", "edge"]},
              "index": {"type": "integer"},
              "status": {"type": "string", "enum": ["applied", "error"]},
              "code": {"type": "integer"},
              "error": {"type": ["string", "null"]}
            }
          }
        }
      }
    },
    "graph_query_request": {
      "type": "object",
      "properties": {
        "where": {
          "type": "object",
          "properties": {
            "subject": {"type": "string"},
            "object": {"type": "string"},
            "node": {"type": "string"},
            "provenance_ref": {"type": "string"}
          }
        },
        "predicates": {"type": "array", "items": {"type": "string"}},
        "direction": {"type": "string", "enum": ["any", "outgoing", "incoming"]},
        "include_versions": {"type": "boolean"},
        "include_tombstoned": {"type": "boolean"},
        "include_stats": {"type": "boolean"},
        "max_result_bytes": {"type": "integer"},
        "as_of": {"type": ["string", "integer"]},
        "limit": {"type": "integer"},
        "cursor": {"type": ["string", "integer"]}
      }
    },
    "graph_query_response": {
      "type": "object",
      "required": ["nodes", "edges", "paging"],
      "properties": {
        "nodes": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["concept_ref", "name", "latest_ref"],
            "properties": {
              "concept_ref": {"type": "string"},
              "name": {"type": ["string", "null"]},
              "latest_ref": {"type": ["string", "null"]},
              "versions": {
                "type": "array",
                "items": {
                  "type": "object",
                  "required": ["edge_ref", "ref"],
                  "properties": {
                    "edge_ref": {"type": "string"},
                    "ref": {"type": "string"}
                  }
                }
              }
            }
          }
        },
        "edges": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["subject_ref", "predicate_ref", "object_ref", "edge_ref"],
            "properties": {
              "subject_ref": {"type": "string"},
              "predicate_ref": {"type": "string"},
              "object_ref": {"type": "string"},
              "edge_ref": {"type": "string"}
            }
          }
        },
        "paging": {
          "type": "object",
          "required": ["next_cursor", "has_more"],
          "properties": {
            "next_cursor": {"type": ["string", "null"]},
            "has_more": {"type": "boolean"}
          }
        },
        "stats": {
          "type": "object",
          "properties": {
            "scanned_edges": {"type": "integer"},
            "returned_edges": {"type": "integer"}
          }
        }
      }
    },
    "graph_retrieve_request": {
      "type": "object",
      "required": ["roots"],
      "properties": {
        "roots": {"type": "array", "items": {"type": "string"}},
        "goal_predicates": {"type": "array", "items": {"type": "string"}},
        "max_depth": {"type": "integer"},
        "max_fanout": {"type": "integer"},
        "include_versions": {"type": "boolean"},
        "include_tombstoned": {"type": "boolean"},
        "as_of": {"type": ["string", "integer"]},
        "provenance_min_confidence": {"type": ["string", "number", "integer"]},
        "limit_nodes": {"type": "integer"},
        "limit_edges": {"type": "integer"},
        "max_result_bytes": {"type": "integer"}
      }
    },
    "graph_retrieve_response": {
      "type": "object",
      "required": ["nodes", "edges", "explanations", "truncated", "stats"],
      "properties": {
        "nodes": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["concept_ref", "name", "latest_ref"],
            "properties": {
              "concept_ref": {"type": "string"},
              "name": {"type": ["string", "null"]},
              "latest_ref": {"type": ["string", "null"]},
              "versions": {
                "type": "array",
                "items": {
                  "type": "object",
                  "required": ["edge_ref", "ref"],
                  "properties": {
                    "edge_ref": {"type": "string"},
                    "ref": {"type": "string"}
                  }
                }
              }
            }
          }
        },
        "edges": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["subject_ref", "predicate_ref", "object_ref", "edge_ref"],
            "properties": {
              "subject_ref": {"type": "string"},
              "predicate_ref": {"type": "string"},
              "object_ref": {"type": "string"},
              "edge_ref": {"type": "string"}
            }
          }
        },
        "explanations": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["edge_ref", "depth", "reasons"],
            "properties": {
              "edge_ref": {"type": "string"},
              "depth": {"type": "integer"},
              "reasons": {"type": "array", "items": {"type": "string"}},
              "confidence": {"type": ["number", "null"]}
            }
          }
        },
        "truncated": {"type": "boolean"},
        "stats": {
          "type": "object",
          "properties": {
            "scanned_edges": {"type": "integer"},
            "traversed_edges": {"type": "integer"},
            "returned_nodes": {"type": "integer"},
            "returned_edges": {"type": "integer"}
          }
        }
      }
    },
    "graph_export_request": {
      "type": "object",
      "properties": {
        "as_of": {"type": ["string", "integer"]},
        "cursor": {"type": ["string", "integer"]},
        "limit": {"type": "integer"},
        "predicates": {"type": "array", "items": {"type": "string"}},
        "roots": {"type": "array", "items": {"type": "string"}},
        "include_tombstoned": {"type": "boolean"},
        "max_result_bytes": {"type": "integer"}
      }
    },
    "graph_export_response": {
      "type": "object",
      "required": ["items", "next_cursor", "has_more", "snapshot_as_of", "stats"],
      "properties": {
        "items": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["seq", "edge_ref", "subject_ref", "predicate_ref", "predicate", "object_ref", "tombstoned"],
            "properties": {
              "seq": {"type": "integer"},
              "edge_ref": {"type": "string"},
              "subject_ref": {"type": "string"},
              "predicate_ref": {"type": "string"},
              "predicate": {"type": "string"},
              "object_ref": {"type": "string"},
              "tombstoned": {"type": "boolean"},
              "metadata_ref": {"type": ["string", "null"]}
            }
          }
        },
        "next_cursor": {"type": ["string", "null"]},
        "has_more": {"type": "boolean"},
        "snapshot_as_of": {"type": "string"},
        "stats": {
          "type": "object",
          "properties": {
            "scanned_edges": {"type": "integer"},
            "exported_items": {"type": "integer"}
          }
        }
      }
    },
    "graph_import_request": {
      "type": "object",
      "required": ["items"],
      "properties": {
        "mode": {"type": "string", "enum": ["fail_fast", "continue_on_error"]},
        "items": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "subject_ref": {"type": "string"},
              "subject": {"type": "string"},
              "predicate_ref": {"type": "string"},
              "predicate": {"type": "string"},
              "object_ref": {"type": "string"},
              "object": {"type": "string"},
              "metadata_ref": {"type": "string"}
            }
          }
        }
      }
    },
    "graph_import_response": {
      "type": "object",
      "required": ["ok", "applied", "results"],
      "properties": {
        "ok": {"type": "boolean"},
        "applied": {"type": "integer"},
        "results": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["index", "status", "code", "error", "edge_ref"],
            "properties": {
              "index": {"type": "integer"},
              "status": {"type": "string", "enum": ["applied", "error"]},
              "code": {"type": "integer"},
              "error": {"type": ["string", "null"]},
              "edge_ref": {"type": ["string", "null"]}
            }
          }
        }
      }
    },
    "graph_schema_predicates_request": {
      "type": "object",
      "properties": {
        "mode": {"type": "string", "enum": ["strict", "warn", "off"]},
        "provenance_mode": {"type": "string", "enum": ["optional", "required"]},
        "predicates": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "predicate_ref": {"type": "string"},
              "predicate": {"type": "string"},
              "domain": {"type": "string"},
              "range": {"type": "string"}
            }
          }
        }
      }
    },
    "graph_schema_predicates_response": {
      "type": "object",
      "required": ["mode", "provenance_mode", "predicates"],
      "properties": {
        "mode": {"type": "string", "enum": ["strict", "warn", "off"]},
        "provenance_mode": {"type": "string", "enum": ["optional", "required"]},
        "predicates": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["predicate_ref", "domain", "range"],
            "properties": {
              "predicate_ref": {"type": "string"},
              "domain": {"type": ["string", "null"]},
              "range": {"type": ["string", "null"]}
            }
          }
        }
      }
    },
    "graph_stats_response": {
      "type": "object",
      "required": ["edges_total", "aliases_total", "index", "tombstones"],
      "properties": {
        "edges_total": {"type": "integer"},
        "aliases_total": {"type": "integer"},
        "index": {
          "type": "object",
          "required": ["built_for_edges", "src_buckets", "dst_buckets", "predicate_buckets", "src_predicate_buckets", "dst_predicate_buckets", "healthy"],
          "properties": {
            "built_for_edges": {"type": "integer"},
            "src_buckets": {"type": "integer"},
            "dst_buckets": {"type": "integer"},
            "predicate_buckets": {"type": "integer"},
            "src_predicate_buckets": {"type": "integer"},
            "dst_predicate_buckets": {"type": "integer"},
            "healthy": {"type": "boolean"}
          }
        },
        "tombstones": {
          "type": "object",
          "required": ["edges", "ratio"],
          "properties": {
            "edges": {"type": "integer"},
            "ratio": {"type": "number"}
          }
        }
      }
    },
    "graph_capabilities_response": {
      "type": "object",
      "required": ["contract", "graph", "runtime"],
      "properties": {
        "contract": {"type": "string"},
        "graph": {
          "type": "object",
          "required": ["version", "features", "limits", "modes"],
          "properties": {
            "version": {"type": "string"},
            "features": {"type": "array", "items": {"type": "string"}},
            "limits": {"type": "object"},
            "modes": {"type": "object"}
          }
        },
        "runtime": {"type": "object"}
      }
    },
    "graph_changes_response": {
      "type": "object",
      "required": ["events", "next_cursor", "has_more"],
      "properties": {
        "events": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["event", "cursor", "edge_ref", "subject_ref", "predicate_ref", "object_ref"],
            "properties": {
              "event": {"type": "string", "enum": ["edge_appended", "version_published", "tombstone_applied"]},
              "cursor": {"type": "string"},
              "edge_ref": {"type": "string"},
              "subject_ref": {"type": "string"},
              "predicate_ref": {"type": "string"},
              "object_ref": {"type": "string"},
              "concept_ref": {"type": "string"},
              "ref": {"type": "string"},
              "tombstoned_edge_ref": {"type": "string"}
            }
          }
        },
        "next_cursor": {"type": ["string", "null"]},
        "has_more": {"type": "boolean"}
      }
    },
    "graph_node_response": {
      "type": "object",
      "required": ["name", "concept_ref", "latest_ref", "versions", "outgoing", "incoming"],
      "properties": {
        "name": {"type": "string"},
        "concept_ref": {"type": "string"},
        "latest_ref": {"type": ["string", "null"]},
        "versions": {"type": "array", "items": {"type": "string"}},
        "outgoing": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["predicate_ref", "object_ref"],
            "properties": {
              "predicate_ref": {"type": "string"},
              "object_ref": {"type": "string"},
              "edge_ref": {"type": "string"},
              "metadata_ref": {"type": ["string", "null"]}
            }
          }
        },
        "incoming": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["predicate_ref", "subject_ref"],
            "properties": {
              "predicate_ref": {"type": "string"},
              "subject_ref": {"type": "string"},
              "edge_ref": {"type": "string"},
              "metadata_ref": {"type": ["string", "null"]}
            }
          }
        }
      }
    },
    "graph_history_response": {
      "type": "object",
      "required": ["name", "events"],
      "properties": {
        "name": {"type": "string"},
        "events": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["event", "at_ms"],
            "properties": {
              "event": {"type": "string"},
              "at_ms": {"type": "integer"},
              "ref": {"type": ["string", "null"]},
              "edge_ref": {"type": ["string", "null"]},
              "details": {"type": "object"}
            }
          }
        }
      }
    },
    "pel_execute_request": {
      "type": "object",
      "required": ["program_ref", "inputs", "receipt"],
      "properties": {
        "program_ref": {"type": "string", "description": "hex ref or concept name"},
        "scheme_ref": {"type": "string", "description": "hex ref or 'dag'"},
        "params_ref": {"type": "string", "description": "hex ref or concept name"},
        "inputs": {
          "type": "object",
          "properties": {
            "refs": {
              "type": "array",
              "items": {"type": "string", "description": "hex ref or concept name"}
            },
            "inline_artifacts": {
              "type": "array",
              "items": {
                "type": "object",
                "required": ["body_hex"],
                "properties": {
                  "content_type": {"type": "string"},
                  "type_tag": {"type": "string", "description": "hex tag id, optional"},
                  "body_hex": {"type": "string"}
                }
              }
            }
          }
        },
        "receipt": {
          "type": "object",
          "required": [
            "input_manifest_ref",
            "environment_ref",
            "evaluator_id",
            "executor_ref",
            "started_at",
            "completed_at"
          ],
          "properties": {
            "input_manifest_ref": {"type": "string", "description": "hex ref or concept name"},
            "environment_ref": {"type": "string", "description": "hex ref or concept name"},
            "evaluator_id": {"type": "string"},
            "executor_ref": {"type": "string", "description": "hex ref or concept name"},
            "sbom_ref": {"type": "string", "description": "hex ref or concept name"},
            "parity_digest_hex": {"type": "string"},
            "executor_fingerprint_ref": {"type": "string", "description": "hex ref or concept name"},
            "run_id_hex": {"type": "string"},
            "limits": {
              "type": "object",
              "required": ["cpu_ms", "wall_ms", "max_rss_kib", "io_reads", "io_writes"],
              "properties": {
                "cpu_ms": {"type": "integer"},
                "wall_ms": {"type": "integer"},
                "max_rss_kib": {"type": "integer"},
                "io_reads": {"type": "integer"},
                "io_writes": {"type": "integer"}
              }
            },
            "logs": {
              "type": "array",
              "items": {
                "type": "object",
                "required": ["kind", "log_ref", "sha256_hex"],
                "properties": {
                  "kind": {"type": "integer"},
                  "log_ref": {"type": "string", "description": "hex ref or concept name"},
                  "sha256_hex": {"type": "string"}
                }
              }
            },
            "determinism_level": {"type": "integer", "description": "0-255"},
            "rng_seed_hex": {"type": "string"},
            "signature_hex": {"type": "string"},
            "started_at": {"type": "integer"},
            "completed_at": {"type": "integer"}
          }
        },
        "effects": {
          "type": "object",
          "properties": {
            "publish_outputs": {"type": "boolean"},
            "append_fed_log": {"type": "boolean"}
          }
        }
      }
    },
    "pel_execute_response": {
      "type": "object",
      "required": ["run_ref", "receipt_ref", "stored_input_refs", "output_refs", "status"],
      "properties": {
        "run_ref": {"type": "string", "description": "hex ref"},
        "trace_ref": {"type": "string", "description": "hex ref"},
        "receipt_ref": {"type": "string", "description": "hex ref"},
        "stored_input_refs": {"type": "array", "items": {"type": "string", "description": "hex ref"}},
        "output_refs": {"type": "array", "items": {"type": "string", "description": "hex ref"}},
        "status": {"type": "string"}
      }
    },
    "error_response": {
      "type": "object",
      "required": ["error"],
      "properties": {
        "error": {
          "type": "object",
          "required": ["code", "message", "retryable"],
          "properties": {
            "code": {"type": "string"},
            "message": {"type": "string"},
            "retryable": {"type": "boolean"}
          }
        }
      }
    }
  }
}