langchain4j-tool-function-calling-patterns

npx skills add majiayu000/claude-skill-registry --skill langchain4j-tool-function-calling-patterns --agent claude-code

Same command for any agent — swap --agent for codex, cursor, copilot.

# LangChain4j Tool & Function Calling Patterns Define tools and enable AI agents to interact with external systems, APIs, and services using LangChain4j's annotation-based and programmatic tool system. ## When to Use This Skill Use this skill when: - Building AI applications that need to interact with external APIs and services - Creating AI assistants that can perform actions beyond text generation - Implementing AI systems that need access to real-time data (weather, stocks, etc.) - Building multi-agent systems where agents can use specialized tools - Creating AI applications with database read/write capabilities - Implementing AI systems that need to integrate with existing business systems - Building context-aware AI applications where tool availability depends on user state - Developing production AI applications that require robust error handling and monitoring ## Setup and Configuration ### Basic Tool Registration ```java // Define tools using @Tool annotation public class CalculatorTools { @Tool("Add two numbers") public double add(double a, double b) { return a + b; } } // Register with AiServices builder interface MathAssistant { String ask(String question); } MathAssista