diff --git a/nanobot/agent/loop.py b/nanobot/agent/loop.py
index 7f129a2..ca9a06e 100644
--- a/nanobot/agent/loop.py
+++ b/nanobot/agent/loop.py
@@ -202,18 +202,9 @@ class AgentLoop:
 
             if response.has_tool_calls:
                 if on_progress:
-                    thoughts = [
-                        self._strip_think(response.content),
-                        response.reasoning_content,
-                        *(
-                            f"Thinking [{b.get('signature', '...')}]:\n{b.get('thought', '...')}"
-                            for b in (response.thinking_blocks or [])
-                            if isinstance(b, dict) and "signature" in b
-                        ),
-                    ]
-                    combined_thoughts = "\n\n".join(filter(None, thoughts))
-                    if combined_thoughts:
-                        await on_progress(combined_thoughts)
+                    thought = self._strip_think(response.content)
+                    if thought:
+                        await on_progress(thought)
                     await on_progress(self._tool_hint(response.tool_calls), tool_hint=True)
 
                 tool_call_dicts = [
diff --git a/tests/test_message_tool_suppress.py b/tests/test_message_tool_suppress.py
index 26b8a16..f5e65c9 100644
--- a/tests/test_message_tool_suppress.py
+++ b/tests/test_message_tool_suppress.py
@@ -86,6 +86,36 @@ class TestMessageToolSuppressLogic:
         assert result is not None
         assert "Hello" in result.content
 
+    @pytest.mark.asyncio
+    async def test_progress_hides_internal_reasoning(self, tmp_path: Path) -> None:
+        loop = _make_loop(tmp_path)
+        tool_call = ToolCallRequest(id="call1", name="read_file", arguments={"path": "foo.txt"})
+        calls = iter([
+            LLMResponse(
+                content="Visible<think>hidden</think>",
+                tool_calls=[tool_call],
+                reasoning_content="secret reasoning",
+                thinking_blocks=[{"signature": "sig", "thought": "secret thought"}],
+            ),
+            LLMResponse(content="Done", tool_calls=[]),
+        ])
+        loop.provider.chat = AsyncMock(side_effect=lambda *a, **kw: next(calls))
+        loop.tools.get_definitions = MagicMock(return_value=[])
+        loop.tools.execute = AsyncMock(return_value="ok")
+
+        progress: list[tuple[str, bool]] = []
+
+        async def on_progress(content: str, *, tool_hint: bool = False) -> None:
+            progress.append((content, tool_hint))
+
+        final_content, _, _ = await loop._run_agent_loop([], on_progress=on_progress)
+
+        assert final_content == "Done"
+        assert progress == [
+            ("Visible", False),
+            ('read_file("foo.txt")', True),
+        ]
+
 
 class TestMessageToolTurnTracking: