Merge remote-tracking branch 'origin/main'

# Conflicts:
#	nanobot/agent/tools/shell.py
#	tests/agent/test_evaluator.py
#	tests/channels/test_feishu_tool_hint_code_block.py
#	tests/providers/test_litellm_kwargs.py
#	tests/tools/test_web_search_tool.py

tests/tools/test_mcp_tool.py

@@ -0,0 +1,162 @@
+from __future__ import annotations
+
+import asyncio
+import sys
+from types import ModuleType, SimpleNamespace
+
+import pytest
+
+from nanobot.agent.tools.mcp import MCPToolWrapper
+
+
+class _FakeTextContent:
+    def __init__(self, text: str) -> None:
+        self.text = text
+
+
+@pytest.fixture(autouse=True)
+def _fake_mcp_module(monkeypatch: pytest.MonkeyPatch) -> None:
+    mod = ModuleType("mcp")
+    mod.types = SimpleNamespace(TextContent=_FakeTextContent)
+    monkeypatch.setitem(sys.modules, "mcp", mod)
+
+
+def _make_wrapper(session: object, *, timeout: float = 0.1) -> MCPToolWrapper:
+    tool_def = SimpleNamespace(
+        name="demo",
+        description="demo tool",
+        inputSchema={"type": "object", "properties": {}},
+    )
+    return MCPToolWrapper(session, "test", tool_def, tool_timeout=timeout)
+
+
+def test_wrapper_preserves_non_nullable_unions() -> None:
+    tool_def = SimpleNamespace(
+        name="demo",
+        description="demo tool",
+        inputSchema={
+            "type": "object",
+            "properties": {
+                "value": {
+                    "anyOf": [{"type": "string"}, {"type": "integer"}],
+                }
+            },
+        },
+    )
+
+    wrapper = MCPToolWrapper(SimpleNamespace(call_tool=None), "test", tool_def)
+
+    assert wrapper.parameters["properties"]["value"]["anyOf"] == [
+        {"type": "string"},
+        {"type": "integer"},
+    ]
+
+
+def test_wrapper_normalizes_nullable_property_type_union() -> None:
+    tool_def = SimpleNamespace(
+        name="demo",
+        description="demo tool",
+        inputSchema={
+            "type": "object",
+            "properties": {
+                "name": {"type": ["string", "null"]},
+            },
+        },
+    )
+
+    wrapper = MCPToolWrapper(SimpleNamespace(call_tool=None), "test", tool_def)
+
+    assert wrapper.parameters["properties"]["name"] == {"type": "string", "nullable": True}
+
+
+def test_wrapper_normalizes_nullable_property_anyof() -> None:
+    tool_def = SimpleNamespace(
+        name="demo",
+        description="demo tool",
+        inputSchema={
+            "type": "object",
+            "properties": {
+                "name": {
+                    "anyOf": [{"type": "string"}, {"type": "null"}],
+                    "description": "optional name",
+                },
+            },
+        },
+    )
+
+    wrapper = MCPToolWrapper(SimpleNamespace(call_tool=None), "test", tool_def)
+
+    assert wrapper.parameters["properties"]["name"] == {
+        "type": "string",
+        "description": "optional name",
+        "nullable": True,
+    }
+
+
+@pytest.mark.asyncio
+async def test_execute_returns_text_blocks() -> None:
+    async def call_tool(_name: str, arguments: dict) -> object:
+        assert arguments == {"value": 1}
+        return SimpleNamespace(content=[_FakeTextContent("hello"), 42])
+
+    wrapper = _make_wrapper(SimpleNamespace(call_tool=call_tool))
+
+    result = await wrapper.execute(value=1)
+
+    assert result == "hello\n42"
+
+
+@pytest.mark.asyncio
+async def test_execute_returns_timeout_message() -> None:
+    async def call_tool(_name: str, arguments: dict) -> object:
+        await asyncio.sleep(1)
+        return SimpleNamespace(content=[])
+
+    wrapper = _make_wrapper(SimpleNamespace(call_tool=call_tool), timeout=0.01)
+
+    result = await wrapper.execute()
+
+    assert result == "(MCP tool call timed out after 0.01s)"
+
+
+@pytest.mark.asyncio
+async def test_execute_handles_server_cancelled_error() -> None:
+    async def call_tool(_name: str, arguments: dict) -> object:
+        raise asyncio.CancelledError()
+
+    wrapper = _make_wrapper(SimpleNamespace(call_tool=call_tool))
+
+    result = await wrapper.execute()
+
+    assert result == "(MCP tool call was cancelled)"
+
+
+@pytest.mark.asyncio
+async def test_execute_re_raises_external_cancellation() -> None:
+    started = asyncio.Event()
+
+    async def call_tool(_name: str, arguments: dict) -> object:
+        started.set()
+        await asyncio.sleep(60)
+        return SimpleNamespace(content=[])
+
+    wrapper = _make_wrapper(SimpleNamespace(call_tool=call_tool), timeout=10)
+    task = asyncio.create_task(wrapper.execute())
+    await started.wait()
+
+    task.cancel()
+
+    with pytest.raises(asyncio.CancelledError):
+        await task
+
+
+@pytest.mark.asyncio
+async def test_execute_handles_generic_exception() -> None:
+    async def call_tool(_name: str, arguments: dict) -> object:
+        raise RuntimeError("boom")
+
+    wrapper = _make_wrapper(SimpleNamespace(call_tool=call_tool))
+
+    result = await wrapper.execute()
+
+    assert result == "(MCP tool call failed: RuntimeError)"