fix: clarify single-image animation montage notice

astrbot/core/pipeline/process_stage/method/agent_sub_stages/image_input.py

@@ -127,8 +127,11 @@ async def prepare_request_images(
         req.extra_user_content_parts = [
             *req.extra_user_content_parts,
             TextPart(
-                text="[Animated image] Animated inputs (e.g. GIF) have been converted "
-                "to frame montages. Read each montage left to right, top to bottom "
-                "as frames of the same animation; unused cells are blank."
+                text="<system_notice>\n"
+                "[Animated image] Each animated input (e.g. GIF) has been converted "
+                "into a frame montage: a single image containing a grid of frames "
+                "from the same animation. Read the frames left to right, then "
+                "top to bottom; unused cells are blank.\n"
+                "</system_notice>"
             ).mark_as_temp(),
         ]

tests/test_process_stage_images.py

@@ -348,11 +348,14 @@ async def test_animation_montage_notice_reaches_model(harness, tmp_path):
         notices = [
             part
             for part in harness.captured[-1].req.extra_user_content_parts
-            if isinstance(part, TextPart) and part.text.startswith("[Animated image]")
+            if isinstance(part, TextPart) and "[Animated image]" in part.text
         ]
         assert len(notices) == int(expected)
         if expected:
-            assert notices[0]._no_save and "frame montages" in notices[0].text
+            assert notices[0]._no_save
+            assert notices[0].text.startswith("<system_notice>\n")
+            assert notices[0].text.endswith("\n</system_notice>")
+            assert "a single image containing a grid of frames" in notices[0].text
 
 
 @pytest.mark.asyncio