Add support for custom base url with google computer use

[tkattkat]

why

currently, there is no way to use a custom baseURL with the google cua client

what changed

when a baseurl is provided in the model object and google cua is used, the client will now proxy all requests through the defined base url

test plan

tested locally
tested on api

I have also made a separate branch, with a proxy server and example script to test if desired
https://github.com/browserbase/stagehand/tree/google-baseurl-example

[changeset-bot]

🦋 Changeset detected

Latest commit: 1e7e69a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@browserbasehq/stagehand	Patch
@browserbasehq/stagehand-evals	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[greptile-apps]

Greptile Overview

Greptile Summary

Adds support for custom baseURL in the Google Computer Use Agent client, enabling requests to be proxied through user-defined endpoints. The implementation extracts baseURL from clientOptions and configures the GoogleGenAI client using httpOptions.baseUrl, aligning with patterns used in Anthropic and OpenAI CUA clients.

Confidence Score: 4/5

• This PR is safe to merge with one minor property naming inconsistency that should be corrected
• The implementation correctly adds baseURL support following the same pattern as other CUA clients. However, there's a property naming inconsistency in clientOptions storage (line 100 uses baseURL while the Google SDK expects baseUrl) that could cause issues if this stored value is used elsewhere
• packages/core/lib/v3/agent/GoogleCUAClient.ts needs attention for the property naming fix on line 100

Important Files Changed

File Analysis

Filename	Score	Overview
.changeset/shiny-eels-stand.md	5/5	Standard changeset file documenting the baseUrl feature for Google CUA client
packages/core/lib/v3/agent/GoogleCUAClient.ts	4/5	Adds custom baseURL support using httpOptions.baseUrl in GoogleGenAI initialization, with minor inconsistency in clientOptions storage

Sequence Diagram

sequenceDiagram
    participant User
    participant AgentProvider
    participant GoogleCUAClient
    participant GoogleGenAI
    participant ProxyServer

    User->>AgentProvider: getClient(modelName, clientOptions)
    Note over User,AgentProvider: clientOptions contains baseURL
    
    AgentProvider->>GoogleCUAClient: new GoogleCUAClient(type, modelName, instructions, clientOptions)
    
    GoogleCUAClient->>GoogleCUAClient: Extract baseURL from clientOptions
    GoogleCUAClient->>GoogleCUAClient: Build genAIOptions with httpOptions.baseUrl
    
    GoogleCUAClient->>GoogleGenAI: new GoogleGenAI(genAIOptions)
    Note over GoogleGenAI: Configured to use custom baseURL
    
    GoogleCUAClient->>GoogleCUAClient: Store baseURL in clientOptions
    
    User->>GoogleCUAClient: execute(executionOptions)
    GoogleCUAClient->>GoogleGenAI: models.generateContent()
    
    alt Custom baseURL provided
        GoogleGenAI->>ProxyServer: API request via custom baseURL
        ProxyServer->>GoogleGenAI: Response
    else No custom baseURL
        GoogleGenAI->>GoogleGenAI: API request to default endpoint
    end
    
    GoogleGenAI-->>GoogleCUAClient: GenerateContentResponse
    GoogleCUAClient-->>User: AgentResult

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[greptile-apps]

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