fix(structure): load dynamic data type options

agents/common/src/main/java/com/dbx/agent/AgentProtocol.java

@@ -15,6 +15,7 @@ public final class AgentProtocol {
     public static final String METHOD_LIST_SCHEMAS = "list_schemas";
     public static final String METHOD_LIST_TABLES = "list_tables";
     public static final String METHOD_LIST_OBJECTS = "list_objects";
+    public static final String METHOD_LIST_DATA_TYPES = "list_data_types";
     public static final String METHOD_COMPLETION_ASSISTANT_SEARCH_V1 = "completion_assistant_search_v1";
     public static final String METHOD_GET_OBJECT_SOURCE = "get_object_source";
     public static final String METHOD_GET_TABLE_DDL = "get_table_ddl";
@@ -85,6 +86,7 @@ public final class AgentProtocol {
         METHOD_LIST_SCHEMAS,
         METHOD_LIST_TABLES,
         METHOD_LIST_OBJECTS,
+        METHOD_LIST_DATA_TYPES,
         METHOD_COMPLETION_ASSISTANT_SEARCH_V1,
         METHOD_GET_OBJECT_SOURCE,
         METHOD_GET_TABLE_DDL,

agents/common/src/main/java/com/dbx/agent/ConfiguredJdbcAgent.java

@@ -60,6 +60,11 @@ public abstract class ConfiguredJdbcAgent extends AbstractJdbcAgent {
         return StandardJdbcMetadata.INSTANCE.listObjects(listTables(schema), schema);
     }
 
+    @Override
+    public List<String> listDataTypes() {
+        return StandardJdbcMetadata.INSTANCE.listDataTypes(requireConnection());
+    }
+
     @Override
     public CompletionAssistantResponse completionAssistantSearch(CompletionAssistantRequest request) {
         return StandardJdbcMetadata.INSTANCE.completionAssistantSearch(requireConnection(), profile, configuredDatabase, request);

agents/common/src/main/java/com/dbx/agent/DatabaseAgent.java

@@ -35,6 +35,10 @@ public interface DatabaseAgent {
         return result;
     }
 
+    default List<String> listDataTypes() {
+        return Collections.emptyList();
+    }
+
     default CompletionAssistantResponse completionAssistantSearch(CompletionAssistantRequest request) {
         throw new UnsupportedOperationException("Completion assistant search is not supported by this agent");
     }

agents/common/src/main/java/com/dbx/agent/JsonRpcServer.java

@@ -115,6 +115,10 @@ public final class JsonRpcServer {
             switchCatalog(params);
             return agent.listObjects(params.get("schema").getAsString());
         }
+        if (AgentProtocol.METHOD_LIST_DATA_TYPES.equals(method)) {
+            switchCatalog(params);
+            return agent.listDataTypes();
+        }
         if (AgentProtocol.METHOD_COMPLETION_ASSISTANT_SEARCH_V1.equals(method)) {
             switchCatalog(params);
             return agent.completionAssistantSearch(gson.fromJson(params, CompletionAssistantRequest.class));

agents/common/src/main/java/com/dbx/agent/StandardJdbcMetadata.java

@@ -90,6 +90,26 @@ public final class StandardJdbcMetadata {
         return result;
     }
 
+    public List<String> listDataTypes(Connection conn) {
+        return unchecked(() -> {
+            Set<String> seen = new LinkedHashSet<>();
+            List<String> names = new ArrayList<>();
+            try (ResultSet rs = conn.getMetaData().getTypeInfo()) {
+                while (rs.next()) {
+                    String name = rs.getString("TYPE_NAME");
+                    if (name == null || name.trim().isEmpty()) {
+                        continue;
+                    }
+                    String trimmed = name.trim();
+                    if (seen.add(trimmed.toLowerCase(Locale.ROOT))) {
+                        names.add(trimmed);
+                    }
+                }
+            }
+            return names;
+        });
+    }
+
     public CompletionAssistantResponse completionAssistantSearch(
         Connection conn,
         JdbcAgentProfile profile,

agents/common/src/main/resources/agent-protocol-v1.json

@@ -43,6 +43,7 @@
     "list_schemas",
     "list_tables",
     "list_objects",
+    "list_data_types",
     "completion_assistant_search_v1",
     "get_object_source",
     "get_table_ddl",