Configuring model for Tanzu AI Services fails with error "Unsupported chat option tool_choice is configured"

Products

• VMware Tanzu Platform - Cloud Foundry

Issue/Introduction

Attempting to update an AI model in Tanzu AI results in error:

Unsupported chat option tool_choice is configured
Response : POST /gemini-3-5-flash-1a911a3/openai/v1/chat/completions/stream 200
Aggregation Error

Stacktrace:

java.lang.RuntimeException: tools.jackson.databind.DatabindException: (was java.lang.NullPointerException)
 at [Source: REDACTED (StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION disabled); byte offset: #UNKNOWN] (through reference chain: com.google.genai.types.AutoValue_Schema$Builder["properties"]->java.util.LinkedHashMap["force_skeleton"]->com.google.genai.types.AutoValue_Schema$Builder["default"])
        at org.springframework.ai.google.genai.GoogleGenAiChatModel.jsonToSchema(GoogleGenAiChatModel.java:422) ~[spring-ai-google-genai-2.0.0-M5.jar!/:2.0.0-M5]

Environment

Tanzu AI Services

Cause

The AI model that is being attempted for use is not yet supported by Tanzu AI Service tile.

Resolution

Operators need to select a version of AI model that is supported by Spring AI. 

Spring AI and Tanzu AI Service tile are frequently being updated to provide support for recent AI model versions. Please make sure to use latest version of Tanzu AI Service tile and reference release notes for updates.