// SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
// SPDX-License-Identifier: Apache-2.0

syntax = "proto3";

package openshell.extension.v1;

// Version of an OpenShell extension protocol contract.
//
// The major version changes when peers cannot safely interoperate. Minor
// versions add optional fields or capabilities and remain compatible when both
// peers' required capabilities are satisfied.
message ProtocolVersion {
  uint32 major = 1;
  uint32 minor = 2;
}

// Non-secret metadata exchanged by the gateway and an extension before use.
message PeerMetadata {
  // Extension-family protocol contract version, distinct from the build.
  ProtocolVersion protocol_version = 1;

  // Stable human-readable implementation identity, such as "openshell/docker".
  string implementation_name = 2;

  // Implementation or build version used only for diagnostics.
  string implementation_version = 3;

  // Optional namespaced capabilities this peer understands.
  repeated string supported_capabilities = 4;

  // Capabilities that the opposite peer must advertise.
  repeated string required_capabilities = 5;
}