diff --git a/src/crewai/agent.py b/src/crewai/agent.py
index bfe980813..e24bd9d27 100644
--- a/src/crewai/agent.py
+++ b/src/crewai/agent.py
@@ -5,6 +5,7 @@ from typing import Any, List, Optional, Tuple
 from langchain.agents.agent import RunnableAgent
 from langchain.agents.tools import BaseTool
 from langchain.agents.tools import tool as LangChainTool
+from langchain.tools.base import StructuredTool
 from langchain_core.agents import AgentAction
 from langchain_core.callbacks import BaseCallbackHandler
 from langchain_openai import ChatOpenAI
@@ -298,7 +299,7 @@ class Agent(BaseAgent):
             agent=RunnableAgent(runnable=inner_agent), **executor_args
         )
 
-    def get_delegation_tools(self, agents: List[BaseAgent]):
+    def get_delegation_tools(self, agents: List[BaseAgent]) -> List[StructuredTool]:
         agent_tools = AgentTools(agents=agents)
         tools = agent_tools.tools()
         return tools
diff --git a/src/crewai/agents/agent_builder/base_agent.py b/src/crewai/agents/agent_builder/base_agent.py
index 5619a0f6d..394e10cda 100644
--- a/src/crewai/agents/agent_builder/base_agent.py
+++ b/src/crewai/agents/agent_builder/base_agent.py
@@ -180,7 +180,7 @@ class BaseAgent(ABC, BaseModel):
         pass
 
     @abstractmethod
-    def get_delegation_tools(self, agents: List["BaseAgent"]):
+    def get_delegation_tools(self, agents: List["BaseAgent"]) -> List[Any]:
         """Set the task tools that init BaseAgenTools class."""
         pass
 
diff --git a/src/crewai/crew.py b/src/crewai/crew.py
index 18238cf7b..2f62bd1ff 100644
--- a/src/crewai/crew.py
+++ b/src/crewai/crew.py
@@ -654,8 +654,29 @@ class Crew(BaseModel):
 
     def _add_delegation_tools(self, task: Task):
         agents_for_delegation = [agent for agent in self.agents if agent != task.agent]
-        if len(self.agents) > 1 and agents_for_delegation:
-            task.tools += task.agent.get_delegation_tools(agents_for_delegation)  # type: ignore
+        if len(self.agents) > 1 and len(agents_for_delegation) > 0 and task.agent:
+            delegation_tools = task.agent.get_delegation_tools(agents_for_delegation)
+
+            # Add tools if they are not already in task.tools
+            for new_tool in delegation_tools:
+                # Find the index of the tool with the same name
+                existing_tool_index = next(
+                    (
+                        index
+                        for index, tool in enumerate(task.tools or [])
+                        if tool.name == new_tool.name
+                    ),
+                    None,
+                )
+                if not task.tools:
+                    task.tools = []
+
+                if existing_tool_index is not None:
+                    # Replace the existing tool
+                    task.tools[existing_tool_index] = new_tool
+                else:
+                    # Add the new tool
+                    task.tools.append(new_tool)
 
     def _log_task_start(self, task: Task, agent: Optional[BaseAgent]):
         color = self._logging_color