diff --git a/src/crewai/agent.py b/src/crewai/agent.py
index f0f605dfd..d37cecc27 100644
--- a/src/crewai/agent.py
+++ b/src/crewai/agent.py
@@ -1,7 +1,7 @@
 import re
 import shutil
 import subprocess
-from typing import Any, Dict, List, Literal, Optional, Sequence, Union
+from typing import Any, Dict, List, Literal, Optional, Sequence, Union, cast
 
 from pydantic import Field, InstanceOf, PrivateAttr, model_validator
 
@@ -342,12 +342,12 @@ class Agent(BaseAgent):
             callbacks=[TokenCalcHandler(self._token_process)],
         )
 
-    def get_delegation_tools(self, agents: Sequence[BaseAgent]):
+    def get_delegation_tools(self, agents: Sequence[BaseAgent]) -> Sequence[BaseTool]:
         # If delegate_to is specified, use those agents instead of all agents
         if self.delegate_to is not None:
-            agents_to_use = self.delegate_to
+            agents_to_use = cast(List[BaseAgent], list(self.delegate_to))
         else:
-            agents_to_use = agents
+            agents_to_use = list(agents)  # Convert to list to match expected type
 
         agent_tools = AgentTools(agents=agents_to_use)
         delegation_tools = agent_tools.tools()
diff --git a/src/crewai/crew.py b/src/crewai/crew.py
index c7e8a5dc7..411551167 100644
--- a/src/crewai/crew.py
+++ b/src/crewai/crew.py
@@ -116,7 +116,7 @@ class Crew(BaseModel):
     name: Optional[str] = Field(default=None)
     cache: bool = Field(default=True)
     tasks: List[Task] = Field(default_factory=list)
-    agents: List[BaseAgent] = Field(default_factory=list)
+    agents: Sequence[BaseAgent] = Field(default_factory=list)
     process: Process = Field(default=Process.sequential)
     verbose: bool = Field(default=False)
     memory: bool = Field(
@@ -802,7 +802,10 @@ class Crew(BaseModel):
                 )
 
             # Determine which tools to use - task tools take precedence over agent tools
-            tools_for_task = task.tools or agent_to_use.tools or []
+            tools_for_task: Sequence[BaseTool] = task.tools or agent_to_use.tools or []
+            # Ensure tools_for_task is a Sequence[BaseTool]
+            if not isinstance(tools_for_task, Sequence):
+                tools_for_task = list(tools_for_task) if tools_for_task else []
             tools_for_task = self._prepare_tools(agent_to_use, task, tools_for_task)
 
             self._log_task_start(task, agent_to_use.role)
@@ -873,7 +876,7 @@ class Crew(BaseModel):
 
     def _prepare_tools(
         self, agent: BaseAgent, task: Task, tools: Sequence[BaseTool]
-    ) -> Sequence[BaseTool]:
+    ) -> list[BaseTool]:
         # Add delegation tools if agent allows delegation
         if agent.allow_delegation:
             if self.process == Process.hierarchical:
@@ -894,7 +897,7 @@ class Crew(BaseModel):
         if hasattr(agent, "multimodal") and agent.multimodal:
             tools = self._add_multimodal_tools(agent, tools)
 
-        return tools
+        return list(tools)  # Ensure we return a list, not just a Sequence
 
     def _get_agent_to_use(self, task: Task) -> Optional[BaseAgent]:
         if self.process == Process.hierarchical: