[Bug Fix] - Agent Delegation Tools Not Being Updated

[c0dezli]

Problem

When an agent is marked with allow_delegation=True and have other tools assigned to it, it cannot access delegation tools. This occurs because the current implementation of _add_delegation_tools only updates task.tools but not agent.tools, causing the agent to lose access to delegation capabilities.

Solution

Updated _add_delegation_tools to properly manage both task.tools and agent.tools, ensuring delegation tools are correctly assigned and accessible.

Minimal Reproducible Example

from crewai import Agent, Crew, Task

# Create a simple tool
class SimpleTool:
    name = "simple_tool"
    def __call__(self): pass

# Setup agents
master_agent = Agent(
    name="master",
    tools=[SimpleTool()],
    allow_delegation=True  # This agent should be able to delegate
)

worker_agent = Agent(
    name="worker",
    tools=[SimpleTool()]
)

# Create crew
crew = Crew(
    agents=[master_agent, worker_agent],
    tasks=[Task(
        description="Test task",
        agent=master_agent
    )]
)

# Before fix: master_agent cannot access delegation tools
# After fix: master_agent can properly access delegation tools

Details

• The bug was in crew.py's _add_delegation_tools method
• Previously, delegation tools were only added to task.tools
• Fixed by introducing add_or_update_tools helper function to manage tool lists
• Now updates both agent.tools and task.tools

Testing

To verify the fix:

1. Create a crew with multiple agents
2. Set allow_delegation=True on the master agent
3. Confirm the master agent can access and use delegation tools

Breaking Changes

None. This is a bug fix that maintains existing API compatibility.