tool-design

## When to Use This Skill Build tools that agents can use effectively, including architectural reduction patterns Use this skill when working with build tools that agents can use effectively, including architectural reduction patterns. # Tool Design for Agents Tools are the primary mechanism through which agents interact with the world. They define the contract between deterministic systems and non-deterministic agents. Unlike traditional software APIs designed for developers, tool APIs must be designed for language models that reason about intent, infer parameter values, and generate calls from natural language requests. Poor tool design creates failure modes that no amount of prompt engineering can fix. Effective tool design follows specific principles that account for how agents perceive and use tools. ## When to Use Activate this skill when: - Creating new tools for agent systems - Debugging tool-related failures or misuse - Optimizing existing tool sets for better agent performance - Designing tool APIs from scratch - Evaluating third-party tools for agent integration - Standardizing tool conventions across a codebase ## Core Concepts Tools are contracts between deterministic systems and non-deterministic agents. The consolidation principle states that if a human engineer cannot definitively say which tool should be used in a given situation, an agent cannot be expected to do better. Effective tool descriptions are prompt engineering that shapes agent behavior. Ke...