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## Why are these changes needed? This PR addresses critical issues in the AssistantAgent that affect tool handling: **Lack of tool call loop functionality**: The agent could not perform multiple consecutive tool calls in a single turn, limiting its ability to complete complex multi-step tasks that require chaining tool operations. These changes enhance the agent's robustness and capability while maintaining full backward compatibility through feature flags. ## Related issue number Closes #6268 ## Checks - [x] I've included any doc changes needed for <https://microsoft.github.io/autogen/>. See <https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md> to build and test documentation locally. - [x] I've added tests corresponding to the changes introduced in this PR. - [x] I've made sure all auto checks have passed. --------- Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>