Package (Required)

• langchain-google-genai
• langchain-google-vertexai
• langchain-google-community
• Other / not sure / general

Checked other resources

• I added a descriptive title to this issue
• I searched the LangChain documentation and API reference (linked above)
• I used the GitHub search to find a similar issue and didn't find it
• I am sure this is a feature request and not a bug report or question

Feature Description

Google Gen AI SDK exposes a seed parameter for more reproducible generations that langchain-google-genai currently doesn't support.

Since this is a relatively minor parameter I don't consider it a bug report but rather a feature request. I'm also providing a PR to add it.

Use Case

A specific use case that I encountered is when creating MVPs or educational materials where high degree of reproducibility is highly important.

Proposed Solution

Add parameter to _BaseGoogleGenerativeAI and ensure that it's used downstream.

Alternatives Considered

I'm not sure which alternatives to try.

Additional Context

As a side note, seed parameter is already supported in langchain-google-vertexai so this is not a completely new request for langchain-google package.