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• This is a feature request, not a bug report or usage question.
• I added a clear and descriptive title that summarizes the feature request.
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Feature Description

Description:
Since version 0.6, the LangGraph documentation recommends avoiding RunnableConfig with configurable and instead using context_schema for static runtime context.

However, when initializing a chat model with init_chat_model, the setup still relies on configurable instead of context_schema. Conceptually, a model (and its parameters) also belongs to the static runtime context.

This creates an inconsistency in practice:

• Some settings (e.g. model and its parameters) must be configured via configurable.
• Other settings (e.g. prompt definition and versioning) must be passed via context_schema.

This separation feels unintuitive and makes project configuration less straightforward.

Feature Request:
Add support for configuring init_chat_model through context_schema so that all static runtime context can be managed consistently in one place.

Use Case

When building a project with multiple runtime configurations, I currently need to split configuration between configurable (for models and their parameters) and context_schema (for prompt definitions and versioning). This separation feels inconsistent and makes configuration management harder to maintain

Proposed Solution

No response

Alternatives Considered

No response

Additional Context

No response