From 05ebb966cf7555aa3690a9fae11188b83f68daf1 Mon Sep 17 00:00:00 2001
From: Yufeng He <40085740+he-yufeng@users.noreply.github.com>
Date: Tue, 2 Jun 2026 08:48:42 +0800
Subject: [PATCH] fix: skip orphan anthropic thinking signatures (#5784)

---
 .../agent_framework_anthropic/_chat_client.py |  9 ++++
 .../anthropic/tests/test_anthropic_client.py  | 42 +++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/python/packages/anthropic/agent_framework_anthropic/_chat_client.py b/python/packages/anthropic/agent_framework_anthropic/_chat_client.py
index 98c181f152..c90b061b4f 100644
--- a/python/packages/anthropic/agent_framework_anthropic/_chat_client.py
+++ b/python/packages/anthropic/agent_framework_anthropic/_chat_client.py
@@ -803,6 +803,15 @@ class RawAnthropicClient(
                     }
                     a_content.append(mcp_result)
                 case "text_reasoning":
+                    if content.text is None:
+                        if (
+                            content.protected_data
+                            and a_content
+                            and a_content[-1].get("type") == "thinking"
+                            and "signature" not in a_content[-1]
+                        ):
+                            a_content[-1]["signature"] = content.protected_data
+                        continue
                     thinking_block: dict[str, Any] = {"type": "thinking", "thinking": content.text}
                     if content.protected_data:
                         thinking_block["signature"] = content.protected_data
diff --git a/python/packages/anthropic/tests/test_anthropic_client.py b/python/packages/anthropic/tests/test_anthropic_client.py
index 0cfec3423c..abad158b8c 100644
--- a/python/packages/anthropic/tests/test_anthropic_client.py
+++ b/python/packages/anthropic/tests/test_anthropic_client.py
@@ -485,6 +485,48 @@ def test_prepare_message_for_anthropic_text_reasoning_with_signature(
     assert result["content"][0]["signature"] == "sig_abc123"
 
 
+def test_prepare_message_for_anthropic_attaches_signature_only_reasoning(
+    mock_anthropic_client: MagicMock,
+) -> None:
+    client = create_test_anthropic_client(mock_anthropic_client)
+    message = Message(
+        role="assistant",
+        contents=[
+            Content.from_text_reasoning(text="Let me think about this..."),
+            Content.from_text_reasoning(text=None, protected_data="sig_abc123"),
+        ],
+    )
+
+    result = client._prepare_message_for_anthropic(message)
+
+    assert result["content"] == [
+        {"type": "thinking", "thinking": "Let me think about this...", "signature": "sig_abc123"}
+    ]
+
+
+def test_prepare_message_for_anthropic_skips_orphan_signature_only_reasoning(
+    mock_anthropic_client: MagicMock,
+) -> None:
+    client = create_test_anthropic_client(mock_anthropic_client)
+    message = Message(
+        role="assistant",
+        contents=[
+            Content.from_text_reasoning(text=None, protected_data="sig_abc123"),
+            Content.from_function_call(
+                call_id="call_123",
+                name="get_weather",
+                arguments={"location": "San Francisco"},
+            ),
+        ],
+    )
+
+    result = client._prepare_message_for_anthropic(message)
+
+    assert len(result["content"]) == 1
+    assert result["content"][0]["type"] == "tool_use"
+    assert result["content"][0]["id"] == "call_123"
+
+
 def test_prepare_message_for_anthropic_mcp_server_tool_call(
     mock_anthropic_client: MagicMock,
 ) -> None: