Fix type validation error in hierarchical process delegation (Issue #2606)

[devin-ai-integration]

Fix type validation error in hierarchical process delegation

Fixes #2606

Description

This PR fixes the type validation error that occurs when using the hierarchical process delegation. The issue happens when a manager agent attempts to pass dictionary objects for task and context parameters, but the DelegateWorkToolSchema strictly requires string values.

Changes

• Modified DelegateWorkToolSchema to accept both string and dictionary inputs
• Updated _run method in DelegateWorkTool to handle both formats by converting dictionaries to strings
• Added a test to verify the fix works with dictionary inputs

Testing

• Added a new test specifically for dictionary inputs
• Verified existing tests continue to pass
• Tested the hierarchical process to ensure it works with the changes

Link to Devin run

https://app.devin.ai/sessions/6bb90d96c63343699562c0bed7990d67

Requested by: Joe Moura (joao@crewai.com)

[devin-ai-integration]

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[HaohanTsao]

Wow I noticed Devin've already done after I opened a PR. I've also worked on a similar fix with some additional elements that might be helpful:

You can see my approach here: link

1. Added comprehensive test cases that follow the existing tool testing style patterns used throughout the codebase
2. Included more detailed documentation on the changes and their implications, and manually test.
3. Thoroughly tested different input combinations (strings, dictionaries, mixed inputs, and edge cases)

If helpful, my contribution could serve as a reference for additional test coverage or documentation.

[devin-ai-integration]

Closing due to inactivity for more than 7 days.