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Python: fix: skip orphan Anthropic thinking signatures #5784

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Merged
moonbox3 merged 1 commit into from
Jun 2, 2026
Merged

Python: fix: skip orphan Anthropic thinking signatures #5784

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9 changes: 9 additions & 0 deletions python/packages/anthropic/agent_framework_anthropic/_chat_client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -803,6 +803,15 @@ def _prepare_message_for_anthropic(self, message: Message) -> dict[str, Any]:
}
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
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42 changes: 42 additions & 0 deletions python/packages/anthropic/tests/test_anthropic_client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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:
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