Why are tool descriptions more important than the implementation code?

LLMs never see your source code; they only see the schema and description provided. If the description is vague, the model will fail to use the tool correctly, even if the underlying code is perfect.

What is the Model Context Protocol (MCP)?

MCP is an emerging standard that acts as a lingua franca for AI tools, allowing models to connect more easily to diverse data sources and services using a unified interface.

How does this skill prevent AI hallucinations?

By implementing strict validation, unambiguous schemas, and crystal-clear usage examples, it reduces the cognitive load on the LLM and prevents it from guessing how to use a tool.

Can this skill help agents recover from errors?

Yes, it emphasizes returning descriptive, actionable errors to the LLM so the model can understand what went wrong and fix its own input before retrying.

Agent Tool Builder

Name: Agent Tool Builder
Author: claudiodearaujo

byclaudiodearaujo

0•

API Development

Designs high-performance tool schemas and descriptions that optimize LLM tool-calling and minimize model hallucinations.

The Agent Tool Builder skill provides specialized expertise in crafting the interface between AI agents and external systems. It operates on the core principle that an LLM's success depends more on the clarity of a tool's schema and description than its underlying implementation. By focusing on JSON Schema best practices, the emerging Model Context Protocol (MCP) standard, and proactive error handling, this skill helps developers build reliable agentic workflows that prevent silent failures, token-wasting loops, and incorrect tool usage.

Key Features

01Clear documentation strategies to reduce LLM hallucinations

020 GitHub stars

03Model Context Protocol (MCP) implementation guidance

04Optimized JSON Schema design for function calling

05Input example patterns to guide model behavior

06Robust tool error handling for agent self-correction

Use Cases

01Building custom MCP servers for complex agentic workflows

02Refining existing tool schemas to improve agent reliability

03Standardizing API descriptions for seamless LLM integration

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add claudiodearaujo/sistema-de-narra-o-de-livro-front agent-tool-builder

For use in Claude.ai and ChatGPT

Download Skill