agent-tool-builder

Design JSON Schemas and validation for AI agent tools.

10|5|Updated Jan 29, 2026
One-click install
npx skills add https://github.com/Claude-Code-Community-Ireland/claude-code-resources --skill agent-tool-builder-claude-code-community-ireland
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: agent-tool-builder
Source: https://github.com/Claude-Code-Community-Ireland/claude-code-resources/tree/main/skills/general/agent-tool-builder
Command: npx skills add https://github.com/Claude-Code-Community-Ireland/claude-code-resources --skill agent-tool-builder-claude-code-community-ireland

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill addresses the critical challenge of designing effective tools for AI agents, preventing common issues like hallucinations, silent failures, and excessive token usage.

Core Features & Use Cases

  • Tool Schema Design: Craft clear and unambiguous JSON Schemas for agent tools.
  • Description Writing: Learn to write effective descriptions that guide LLMs accurately.
  • Validation & Error Handling: Implement robust validation and error handling for reliable tool performance.
  • MCP Standard: Understand and utilize the Model Context Protocol for tool interoperability.
  • Use Case: Develop a custom tool for an e-commerce agent that allows it to search for products, ensuring the agent correctly specifies search parameters and handles cases where no products are found.

Quick Start

Use the agent-tool-builder skill to design a JSON schema for a tool that can fetch the current weather for a given city.

Frequently Asked Questions about agent-tool-builder

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I design a JSON schema for AI agent function calling?

Designing a JSON schema for agent tools requires crafting clear, unambiguous definitions and descriptive text that accurately guides LLMs to specify parameters and prevent hallucinations during function calling.

What is the best way to write tool descriptions for LLMs to prevent silent failures?

Writing effective tool descriptions for LLMs involves creating clear, unambiguous schema definitions and implementing robust validation to guide agents accurately and prevent silent failures during execution.

How does the Model Context Protocol work for AI agent tool interoperability?

The Model Context Protocol (MCP) standard enables tool interoperability for AI agents by providing a consistent framework for schema definition, validation, and error handling across different platforms.

Can I use this approach to build an e-commerce product search tool for an agent?

Yes, you can build an e-commerce agent tool by defining a JSON schema that allows the agent to correctly specify search parameters and handle cases where no products are found.

Why does my AI agent hallucinate parameters when using custom tools?

AI agents hallucinate parameters when tool schemas lack descriptive clarity; you can prevent this by crafting unambiguous JSON schemas and writing effective descriptions that guide LLMs accurately.