Option for Vertex missing in the list of models (frontend)

[charl3sj]

Describe the bug
We've added support for Gemini chat model via VertexAI in the backend but the corresponding frontend changes are missing.

Expected behavior
User should be allowed to select Vertex and Gemini as a model.

Screenshots

Refer

agentcloud/agent-backend/src/models/mongo.py

Line 29 in e19ff6c

GoogleVertex = "google_vertex"

[tomlynchRNA]

@anada10 I remember now, this wasn't made available in frontend yet because vertex only takes credentials from an environment variable. We can't support users providing their own credentials: https://python.langchain.com/v0.2/docs/integrations/chat/google_vertex_ai_palm/#credentials

[anada10]

@tomlynchRNA what if we use OAUTH for GCP instead?

[tomlynchRNA]

@anada10 I don't think so, it has to be the credentials (like credentials json). They make it pretty clear in their docs/code comments:

---

But good news, I checked the ChatVertexAI source code in Google repo and found this:

https://github.com/langchain-ai/langchain-google/blob/main/libs/vertexai/langchain_google_vertexai/chat_models.py#L648C9-L648C17

So, turns out there is an undocumented option to pass the credentials directly just like other models 😄

We need an update in the webapp and agent-backend to pass credentials, project and location:

cc @charl3sj