agent-tool-builder

Design MCP-compatible tool schemas with validation and error handling.

1|Updated Dec 15, 2025
One-click install
npx skills add https://github.com/jokken79/YuKyuDATA-app1.0v --skill agent-tool-builder-jokken79
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: agent-tool-builder
Source: https://github.com/jokken79/YuKyuDATA-app1.0v/tree/main/.agent/skills/agent-tool-builder
Command: npx skills add https://github.com/jokken79/YuKyuDATA-app1.0v --skill agent-tool-builder-jokken79

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Tools empower AI agents to interact with external systems. Badly designed tools lead to misuses, errors, and wasted tokens.

Core Features & Use Cases

  • Clear Tool Schema Design
  • Robust Validation and Error Handling
  • MCP Compatibility

Use Case: Design a tool schema for a weather-check API and provide precise, actionable prompts to guide LLM usage.

Quick Start

Design a clear, well-documented tool schema for a weather-check tool and implement basic error handling.

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 tool schema for reliable AI agent interactions?

To design a reliable AI tool schema, craft clear entry points, structured metadata, and descriptive documentation. This ensures safe, predictable tool behavior and guides the LLM to use the tool correctly without misusing it or wasting tokens.

Why do my LLM tools keep failing or misusing parameters during function calling?

LLM tools often fail during function calling due to badly designed schemas lacking validation and error handling. Implementing robust schema design, clear documentation, and precise actionable prompts prevents misuse, reduces errors, and ensures predictable agent behavior.

How do I add validation and error handling to MCP-compatible tools?

Add validation and error handling to MCP-compatible tools by defining clear schemas and structured metadata. This process ensures safe, predictable tool behavior by catching parameter errors early and providing actionable feedback to the LLM.

What is the best way to document tool schemas for LLM function calling?

The best way to document tool schemas for function calling is to provide precise, actionable prompts and descriptive tool documentation within the schema design. This approach minimizes wasted tokens and ensures the LLM understands exactly how to interact with the tool.

Can I use this approach to design tools for any external API?

Yes, you can use this schema design approach for any external API. It focuses on crafting clear schemas, implementing basic error handling, and providing actionable prompts to guide LLM usage, ensuring safe and predictable interactions with external systems.