Designing Simple Tool Interfaces › Designing Simple Tool Interfaces

You know why agents need tools. Now let's talk about how to actually connect them. How does an agent know what tools are available? How does it decide which one to use? And once it decides, how does it actually call the tool and use the result?

These questions might sound complicated, but the answers are surprisingly straightforward. At its core, a tool is just a function the agent can call. The trick is making sure the agent understands what the function does, what inputs it needs, and what output to expect.

In this chapter, we'll design a simple, practical framework for connecting tools to your agent. We'll stay library-agnostic and focus on the concepts, so you can apply these ideas regardless of which specific framework you eventually use.