Integration of select and cancel

[kakasoo]

When building our agent, there are two internal agents called select and cancel. The select agent is responsible for choosing a tool based on the user's utterance, while the cancel agent handles canceling the selection. These separate agents impact performance, so we need to merge them into a single agent.

[kakasoo]

But in my case, there was a case where I didn't use the tool at all when I made the agent. In this case, I don't think there's a big problem if there's just a describe inside. So if there's no tool at all, I don't think it's okay to make all the tool-related agents pass including Select.