register find_similar_objects chat tool definition

frigate/api/chat.py

@@ -251,6 +251,76 @@ def get_tool_definitions() -> List[Dict[str, Any]]:
                 "required": [],
             },
         },
+        {
+            "type": "function",
+            "function": {
+                "name": "find_similar_objects",
+                "description": (
+                    "Find tracked objects that are visually and semantically similar "
+                    "to a specific past event. Use this when the user references a "
+                    "particular object they have seen and wants to find other "
+                    "sightings of the same or similar one ('that green car', 'the "
+                    "person in the red jacket', 'the package that was delivered'). "
+                    "Prefer this over search_objects whenever the user's intent is "
+                    "'find more like this specific one.' Use search_objects first "
+                    "only if you need to locate the anchor event. Requires semantic "
+                    "search to be enabled."
+                ),
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "event_id": {
+                            "type": "string",
+                            "description": "The id of the anchor event to find similar objects to.",
+                        },
+                        "after": {
+                            "type": "string",
+                            "description": "Start time in ISO 8601 format (e.g., '2024-01-01T00:00:00Z').",
+                        },
+                        "before": {
+                            "type": "string",
+                            "description": "End time in ISO 8601 format (e.g., '2024-01-01T23:59:59Z').",
+                        },
+                        "cameras": {
+                            "type": "array",
+                            "items": {"type": "string"},
+                            "description": "Optional list of cameras to restrict to. Defaults to all.",
+                        },
+                        "labels": {
+                            "type": "array",
+                            "items": {"type": "string"},
+                            "description": "Optional list of labels to restrict to. Defaults to the anchor event's label.",
+                        },
+                        "sub_labels": {
+                            "type": "array",
+                            "items": {"type": "string"},
+                            "description": "Optional list of sub_labels (names) to restrict to.",
+                        },
+                        "zones": {
+                            "type": "array",
+                            "items": {"type": "string"},
+                            "description": "Optional list of zones. An event matches if any of its zones overlap.",
+                        },
+                        "similarity_mode": {
+                            "type": "string",
+                            "enum": ["visual", "semantic", "fused"],
+                            "description": "Which similarity signal(s) to use. 'fused' (default) combines visual and semantic.",
+                            "default": "fused",
+                        },
+                        "min_score": {
+                            "type": "number",
+                            "description": "Drop matches with a similarity score below this threshold (0.0-1.0).",
+                        },
+                        "limit": {
+                            "type": "integer",
+                            "description": "Maximum number of matches to return (default: 10).",
+                            "default": 10,
+                        },
+                    },
+                    "required": ["event_id"],
+                },
+            },
+        },
         {
             "type": "function",
             "function": {

frigate/test/test_chat_find_similar_objects.py

@@ -202,5 +202,38 @@ class TestBuildSimilarCandidatesQuery(unittest.TestCase):
         self.assertNotIn("e0000", ids)
 
 
+from frigate.api.chat import get_tool_definitions
+
+
+class TestToolDefinition(unittest.TestCase):
+    def test_find_similar_objects_is_registered(self):
+        tools = get_tool_definitions()
+        names = [t["function"]["name"] for t in tools]
+        self.assertIn("find_similar_objects", names)
+
+    def test_find_similar_objects_schema(self):
+        tools = get_tool_definitions()
+        tool = next(
+            t for t in tools if t["function"]["name"] == "find_similar_objects"
+        )
+        params = tool["function"]["parameters"]["properties"]
+        self.assertIn("event_id", params)
+        self.assertIn("after", params)
+        self.assertIn("before", params)
+        self.assertIn("cameras", params)
+        self.assertIn("labels", params)
+        self.assertIn("sub_labels", params)
+        self.assertIn("zones", params)
+        self.assertIn("similarity_mode", params)
+        self.assertIn("min_score", params)
+        self.assertIn("limit", params)
+        self.assertEqual(
+            tool["function"]["parameters"]["required"], ["event_id"]
+        )
+        self.assertEqual(
+            params["similarity_mode"]["enum"], ["visual", "semantic", "fused"]
+        )
+
+
 if __name__ == "__main__":
     unittest.main()