AI integration with external systems has transformed Large Language Models (LLMs) from passive text generators into active agents capable of executing real-world tasks such as creating GitHub pull requests, managing databases, and orchestrating development workflows. This integration is facilitated by tools for LLMs, which are external functions or APIs allowing language models to interact with real-world systems by performing actions beyond text generation. The process involves defining tools with clear schemas, ensuring context awareness, making decisions based on user intent, executing function calls, and generating human-readable responses. A practical example is demonstrated through a GitHub agent, which uses natural language processing to manage GitHub operations, showcasing the potential for LLMs to simplify complex workflows and enhance user interaction with technical systems. The approach offers a natural language interface, parameter flexibility, and extensibility, making it a powerful foundation for building more intuitive and intelligent systems.