LangChain4j Tool & Function Calling Patterns Provides patterns for annotating methods as tools, configuring tool executors, registering tools with AI services, validating parameters, and handling tool execution errors in LangChain4j applications. Overview LangChain4j uses the annotation to expose Java methods as callable functions for AI agents. The builder registers tools with a chat model, enabling LLMs to perform actions beyond text generation: database queries, API calls, calculations, and business system integrations. Parameters use for descriptions that guide the LLM. When to Use - Buil…