feat: add ToolWithInstruction wrapper for tool-specific usage instructions (issue #2515)

Co-Authored-By: Joe Moura <joao@crewai.com>

tests/tools/test_tool_with_instruction.py

@@ -0,0 +1,67 @@
+import pytest
+from unittest.mock import MagicMock, patch
+from typing import Any, Dict, Optional
+
+from crewai.tools.base_tool import BaseTool, Tool
+from crewai.tools.tool_with_instruction import ToolWithInstruction
+
+
+class MockTool(BaseTool):
+    """Mock tool for testing."""
+    name: str = "mock_tool"
+    description: str = "A mock tool for testing"
+    
+    def _run(self, *args: Any, **kwargs: Any) -> str:
+        return "mock result"
+
+
+class TestToolWithInstruction:
+    """Test suite for ToolWithInstruction."""
+    
+    def test_initialization(self):
+        """Test tool initialization with instructions."""
+        tool = MockTool()
+        instructions = "Only use this tool for XYZ"
+        
+        wrapped_tool = ToolWithInstruction(tool=tool, instructions=instructions)
+        
+        assert wrapped_tool.name == tool.name
+        assert "Instructions: Only use this tool for XYZ" in wrapped_tool.description
+        assert wrapped_tool.args_schema == tool.args_schema
+    
+    def test_run_method(self):
+        """Test that the run method delegates to the original tool."""
+        tool = MockTool()
+        instructions = "Only use this tool for XYZ"
+        
+        wrapped_tool = ToolWithInstruction(tool=tool, instructions=instructions)
+        result = wrapped_tool.run()
+        
+        assert result == "mock result"
+    
+    def test_to_structured_tool(self):
+        """Test that to_structured_tool includes instructions."""
+        tool = MockTool()
+        instructions = "Only use this tool for XYZ"
+        
+        wrapped_tool = ToolWithInstruction(tool=tool, instructions=instructions)
+        structured_tool = wrapped_tool.to_structured_tool()
+        
+        assert "Instructions: Only use this tool for XYZ" in structured_tool.description
+    
+    def test_with_function_tool(self):
+        """Test tool wrapping with a function tool."""
+        def sample_func():
+            return "sample result"
+            
+        tool = Tool(
+            name="sample_tool", 
+            description="A sample tool", 
+            func=sample_func
+        )
+        
+        instructions = "Only use this tool for XYZ"
+        wrapped_tool = ToolWithInstruction(tool=tool, instructions=instructions)
+        
+        assert wrapped_tool.name == tool.name
+        assert "Instructions: Only use this tool for XYZ" in wrapped_tool.description