diff --git a/apps/t3/src/main/java/org/onosproject/t3/api/TroubleshootService.java b/apps/t3/src/main/java/org/onosproject/t3/api/TroubleshootService.java
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+++ b/apps/t3/src/main/java/org/onosproject/t3/api/TroubleshootService.java
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+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed 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.onosproject.t3.api;
+
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.flow.TrafficSelector;
+
+/**
+ * API for troubleshooting services, providing static analysis of installed
+ * flows and groups.
+ */
+public interface TroubleshootService {
+
+
+    /**
+     * Requests a static trace be performed for the given traffic selector
+     * starting at the given connect point.
+     *
+     * @param packet description of packet
+     * @param in point at which packet starts
+     * @return a trace result
+     */
+    StaticPacketTrace trace(TrafficSelector packet, ConnectPoint in);
+}