merge origin/main into pr-1824

- wire tools.exec.enable and deny_patterns into the current AgentLoop
- preserve the current WebSearchTool config-based registration path
- treat deny_patterns=[] as an explicit override instead of falling back
  to the default blacklist
- add regression coverage for disabled exec registration and custom deny
  patterns

Made-with: Cursor

tests/test_task_cancel.py

@@ -8,7 +8,7 @@ from unittest.mock import AsyncMock, MagicMock, patch
 import pytest
 
 
-def _make_loop():
+def _make_loop(*, exec_config=None):
     """Create a minimal AgentLoop with mocked dependencies."""
     from nanobot.agent.loop import AgentLoop
     from nanobot.bus.queue import MessageBus
@@ -23,7 +23,7 @@ def _make_loop():
          patch("nanobot.agent.loop.SessionManager"), \
          patch("nanobot.agent.loop.SubagentManager") as MockSubMgr:
         MockSubMgr.return_value.cancel_by_session = AsyncMock(return_value=0)
-        loop = AgentLoop(bus=bus, provider=provider, workspace=workspace)
+        loop = AgentLoop(bus=bus, provider=provider, workspace=workspace, exec_config=exec_config)
     return loop, bus
 
 
@@ -90,6 +90,23 @@ class TestHandleStop:
 
 
 class TestDispatch:
+    def test_exec_tool_not_registered_when_disabled(self):
+        from nanobot.config.schema import ExecToolConfig
+
+        loop, _bus = _make_loop(exec_config=ExecToolConfig(enable=False))
+
+        assert loop.tools.get("exec") is None
+
+    def test_exec_tool_receives_custom_deny_patterns(self):
+        from nanobot.agent.tools.shell import ExecTool
+        from nanobot.config.schema import ExecToolConfig
+
+        loop, _bus = _make_loop(exec_config=ExecToolConfig(deny_patterns=[r"\becho\b"]))
+        tool = loop.tools.get("exec")
+
+        assert isinstance(tool, ExecTool)
+        assert tool.deny_patterns == [r"\becho\b"]
+
     @pytest.mark.asyncio
     async def test_dispatch_processes_and_publishes(self):
         from nanobot.bus.events import InboundMessage, OutboundMessage
@@ -165,3 +182,46 @@ class TestSubagentCancellation:
         provider.get_default_model.return_value = "test-model"
         mgr = SubagentManager(provider=provider, workspace=MagicMock(), bus=bus)
         assert await mgr.cancel_by_session("nonexistent") == 0
+
+    @pytest.mark.asyncio
+    async def test_subagent_preserves_reasoning_fields_in_tool_turn(self, monkeypatch, tmp_path):
+        from nanobot.agent.subagent import SubagentManager
+        from nanobot.bus.queue import MessageBus
+        from nanobot.providers.base import LLMResponse, ToolCallRequest
+
+        bus = MessageBus()
+        provider = MagicMock()
+        provider.get_default_model.return_value = "test-model"
+
+        captured_second_call: list[dict] = []
+
+        call_count = {"n": 0}
+
+        async def scripted_chat_with_retry(*, messages, **kwargs):
+            call_count["n"] += 1
+            if call_count["n"] == 1:
+                return LLMResponse(
+                    content="thinking",
+                    tool_calls=[ToolCallRequest(id="call_1", name="list_dir", arguments={})],
+                    reasoning_content="hidden reasoning",
+                    thinking_blocks=[{"type": "thinking", "thinking": "step"}],
+                )
+            captured_second_call[:] = messages
+            return LLMResponse(content="done", tool_calls=[])
+        provider.chat_with_retry = scripted_chat_with_retry
+        mgr = SubagentManager(provider=provider, workspace=tmp_path, bus=bus)
+
+        async def fake_execute(self, name, arguments):
+            return "tool result"
+
+        monkeypatch.setattr("nanobot.agent.tools.registry.ToolRegistry.execute", fake_execute)
+
+        await mgr._run_subagent("sub-1", "do task", "label", {"channel": "test", "chat_id": "c1"})
+
+        assistant_messages = [
+            msg for msg in captured_second_call
+            if msg.get("role") == "assistant" and msg.get("tool_calls")
+        ]
+        assert len(assistant_messages) == 1
+        assert assistant_messages[0]["reasoning_content"] == "hidden reasoning"
+        assert assistant_messages[0]["thinking_blocks"] == [{"type": "thinking", "thinking": "step"}]