001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.rest.server.mcp;
018
019/**
020 * Revision-neutral role for {@link McpPromptMessage} entries.
021 *
022 * <p>
023 * MCP wire formats use lowercase strings; {@link #toWire()} and {@link #toString()} both return them.
024 */
025public enum McpRole {
026
027   /** User role. */
028   USER("user"),
029
030   /** Assistant role. */
031   ASSISTANT("assistant"),
032
033   /** System role. */
034   SYSTEM("system"),
035
036   /** Tool role. */
037   TOOL("tool");
038
039   private final String wire;
040
041   McpRole(String wire) {
042      this.wire = wire;
043   }
044
045   /**
046    * Wire token for JSON payloads.
047    *
048    * @return Lowercase MCP role string.
049    */
050   public String toWire() {
051      return wire;
052   }
053
054   @Override /* Object */
055   public String toString() {
056      return wire;
057   }
058}