feat: add MCP protocol compliance tests

tests/integration/test_mcp_protocol.py

@@ -0,0 +1,57 @@
+"""Test MCP protocol compliance over SSE transport."""
+
+import pytest
+
+
+@pytest.mark.asyncio
+async def test_mcp_connection_initializes(mcp_client):
+    """Test that MCP client can connect and initialize."""
+    # If we get here, connection and initialization succeeded
+    assert mcp_client is not None
+
+
+@pytest.mark.asyncio
+async def test_list_tools_returns_all_tools(mcp_client):
+    """Test that list_tools returns all expected tools."""
+    result = await mcp_client.list_tools()
+    tool_names = [tool.name for tool in result.tools]
+
+    expected_tools = [
+        "list_documents",
+        "list_tables",
+        "describe_table",
+        "get_records",
+        "sql_query",
+        "add_records",
+        "update_records",
+        "delete_records",
+        "create_table",
+        "add_column",
+        "modify_column",
+        "delete_column",
+    ]
+
+    for expected in expected_tools:
+        assert expected in tool_names, f"Missing tool: {expected}"
+
+    assert len(result.tools) == 12
+
+
+@pytest.mark.asyncio
+async def test_list_tools_has_descriptions(mcp_client):
+    """Test that all tools have descriptions."""
+    result = await mcp_client.list_tools()
+
+    for tool in result.tools:
+        assert tool.description, f"Tool {tool.name} has no description"
+        assert len(tool.description) > 10, f"Tool {tool.name} description too short"
+
+
+@pytest.mark.asyncio
+async def test_list_tools_has_input_schemas(mcp_client):
+    """Test that all tools have input schemas."""
+    result = await mcp_client.list_tools()
+
+    for tool in result.tools:
+        assert tool.inputSchema is not None, f"Tool {tool.name} has no inputSchema"
+        assert "type" in tool.inputSchema, f"Tool {tool.name} schema missing type"