Summary

Zed overwrites Agent settings when choosing a different LLM from the Agent Panel.

Description

I have my Agent Panel docked to the left and my settings file needs an auto-migration, as it uses deprecated settings. When I choose a different model from the Agent Panel, Zed overwrites all settings related to it.

Steps to reproduce:

1. Modify the agent key in root settings.json (set dock to left)
2. Open Agent Panel
3. Choose a different model than the default one

Expected Behavior:
Zed should use the chosen model, only overwrite the default_model key and not update the remaining user settings defined in agent key.

Actual Behavior:
Zed overwrites all settings pertaining to the agent key. This behavior occurs even if you don’t have a default model set.

Zed Version and System Specs

Zed: v0.209.6 (Zed)
OS: macOS 15.7
Memory: 18 GiB
Architecture: aarch64