mchades commented on code in PR #12499:
URL: https://github.com/apache/gravitino/pull/12499#discussion_r3831797414


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api/src/main/java/org/apache/gravitino/semantic/AIContext.java:
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@@ -0,0 +1,133 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.gravitino.semantic;
+
+import com.google.common.base.Preconditions;
+import java.util.Objects;
+import javax.annotation.Nullable;
+import org.apache.gravitino.annotation.Evolving;
+
+/** Additional context for AI tools, represented as either a string or an 
object. */
+@Evolving
+public final class AIContext {
+
+  @Nullable private final String text;
+  @Nullable private final AIContextObject object;
+
+  private AIContext(String text) {
+    this.text = text;
+    this.object = null;
+  }
+
+  private AIContext(AIContextObject object) {
+    this.text = null;
+    this.object = object;
+  }

Review Comment:
   No. Ossie defines `AIContext` as a `oneOf` string or object. The two private 
constructors preserve this invariant: `of(String)` sets only `text`, while 
`of(AIContextObject)` sets only `object`, and both factories reject null. 
Therefore, exactly one variant is present in every `AIContext` instance.



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