feat(langchain-google-common): Add jsonSchema method support to withStructuredOutput in langchain-google-common and VertexAI #9518
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…ogle-common - Add responseSchema property to GoogleAIModelRequestParams and GeminiGenerationConfig - Update withStructuredOutput to support both jsonSchema (default) and functionCalling methods - Add responseSchema handling in formatGenerationConfig to set responseMimeType to application/json - Update copyAIModelParamsInto to copy responseSchema - Add comprehensive tests for jsonSchema method support - Update error message to reflect supported methods
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yukukotani
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Nov 30, 2025
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| // Not specifying method - should default to jsonSchema | ||
| const model = baseModel.withStructuredOutput(schema); |
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Using jsonSchema method by default. This is the same behaviour as langchain-google-genai, but might be a breaking change for langchain-google-vertexai users.
I would like to have an opinion of maintainers.
yukukotani
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Currently,
withStructuredOutputin langchain-google-genai (Gemini API) supportsjsonSchemamethod, which is using native structured output.While that, langchain-google-common (which is used by langchain-google-vertexai) supports only
functionCallingmethod.This PR adds
jsonSchemamethod support to langchain-google-common. The implementation is mostly modeled after langchain-google-genai.