From 3ad617d3ff9a82280fe71dbfb4c7a238b6273238 Mon Sep 17 00:00:00 2001
From: Gaurav Gupta <gauravaz@amazon.com>
Date: Fri, 17 Apr 2026 18:43:21 +0000
Subject: [PATCH 1/2] fix: include reasoning block with empty text and
 non-empty signature

---
 src/strands/event_loop/streaming.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/strands/event_loop/streaming.py b/src/strands/event_loop/streaming.py
index 76eda48bf..2b346c840 100644
--- a/src/strands/event_loop/streaming.py
+++ b/src/strands/event_loop/streaming.py
@@ -303,7 +303,7 @@ def handle_content_block_stop(state: dict[str, Any]) -> dict[str, Any]:
             content.append({"text": text})
         state["text"] = ""
 
-    elif reasoning_text:
+    elif reasoning_text or "signature" in state:
         content_block: ContentBlock = {
             "reasoningContent": {
                 "reasoningText": {

From b7cdea3c9e132426e3417fa38163c9f7df360549 Mon Sep 17 00:00:00 2001
From: Gaurav Gupta <gauravaz@amazon.com>
Date: Tue, 21 Apr 2026 07:01:50 +0000
Subject: [PATCH 2/2] test: add test-case for reasoning content block with
 empty text and non-empty signature

---
 tests/strands/event_loop/test_streaming.py | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tests/strands/event_loop/test_streaming.py b/tests/strands/event_loop/test_streaming.py
index 93f8d95f8..be67c0471 100644
--- a/tests/strands/event_loop/test_streaming.py
+++ b/tests/strands/event_loop/test_streaming.py
@@ -481,6 +481,27 @@ def test_handle_content_block_delta(event: ContentBlockDeltaEvent, event_type, s
                 "redactedContent": b"",
             },
         ),
+        # Reasoning with empty text but non-empty signature
+        (
+            {
+                "content": [],
+                "current_tool_use": {},
+                "text": "",
+                "reasoningText": "",
+                "signature": "123",
+                "citationsContent": [],
+                "redactedContent": b"",
+            },
+            {
+                "content": [{"reasoningContent": {"reasoningText": {"text": "", "signature": "123"}}}],
+                "current_tool_use": {},
+                "text": "",
+                "reasoningText": "",
+                "signature": "123",
+                "citationsContent": [],
+                "redactedContent": b"",
+            },
+        ),
         # redactedContent
         (
             {