LLM kept mentioning agent mode, still don't know what it means even.

LLM kept mentioning agent mode, still don't know what it means even. It description just made it sound like a code session instead of chat session. but that agent doesn't appear on the ui as far as i can tell.

In Copilot Chat (**Agent** mode), open tools and start the `godot` server.

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| Field | Value |
| --- | --- |
| App version | 1.0.23 |
| OS | Windows 10.0.19045 |
| Theme | Monochrome |
| Path | /chat |
| Tenure | Week 3 |

Reproduce the report in the /chat path using Copilot Chat Agent mode, opening tools and starting the godot server. Check whether Agent mode appears in the UI and whether its description distinguishes an agent session from a chat session. Done means the mode is discoverable and its explanation matches the observed behavior.

索引モデルが issue の本文から書いたものです。