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## Why are these changes needed?
Add support for default model client, in AGS updates to settings UI.
A default model client will be used for subsequent background tasks
(e.g, automatically naming sessions to meaningful names).
<img width="1441" alt="image"
src="https://github.com/user-attachments/assets/31675ef4-8f80-4a8c-9762-3d6bcbc6d33d"
/>
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solves. -->
## Related issue number
<!-- For example: "Closes #1234" -->
Closes#5685
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- [ ] 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.
- [ ] I've added tests (if relevant) corresponding to the changes
introduced in this PR.
- [ ] I've made sure all auto checks have passed.
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This PR has 3 main improvements.
- Token streaming
- Adds support for environment variables in the app settings
- Updates AGS to persist Gallery entry in db.
## Adds Token Streaming in AGS.
Agentchat now supports streaming of tokens via
`ModelClientStreamingChunkEvent `. This PR is to track progress on
supporting that in the AutoGen Studio UI.
If `model_client_stream` is enabled in an assitant agent, then token
will be streamed in UI.
```python
streaming_assistant = AssistantAgent(
name="assistant",
model_client=model_client,
system_message="You are a helpful assistant.",
model_client_stream=True, # Enable streaming tokens.
)
```
https://github.com/user-attachments/assets/74d43d78-6359-40c3-a78e-c84dcb5e02a1
## Env Variables
Also adds support for env variables in AGS Settings
You can set env variables that are loaded just before a team is run.
Handy to set variable to be used by tools etc.
<img width="1291" alt="image"
src="https://github.com/user-attachments/assets/437b9d90-ccee-42f7-be5d-94ab191afd67"
/>
> Note: the set variables are available to the server process.
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## Why are these changes needed?
<!-- Please give a short summary of the change and the problem this
solves. -->
## Related issue number
<!-- For example: "Closes #1234" -->
Closes#5627Closes#5662Closes#5619
## Checks
- [ ] 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.
- [ ] I've added tests (if relevant) corresponding to the changes
introduced in this PR.
- [ ] I've made sure all auto checks have passed.
Victor Dibia