Fix list_agents to not call it self.

[gersh]

Background

list_agents is calling itself and encountering infinite recursion.

Changes

Make list_agents return a list of the agents manager.

Documentation

Test Plan

I added a unit test to test that list_agents works.

PR Quality Checklist

• [x ] My pull request is atomic and focuses on a single change.
• [x ] I have thoroughly tested my changes with multiple different prompts.
• [x ] I have considered potential risks and mitigations for my changes.
• [x ] I have documented my changes clearly and comprehensively.
• [x ] I have not snuck in any "extra" small tweaks changes

[nponeccop]

@gersh There are conflicts now