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agent-tool-builder

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<!-- AUTO-GENERATED by export-skills.py — DO NOT EDIT -->
---
name: agent-tool-builder
description: "Tools are how AI agents interact with the world. A well-designed tool is the difference between an agent that works and one that hallucinates, fails silently, or costs 10x more tokens than necessary.  This skill covers tool design from schema to error handling. JSON Schema best practices, description writing that actually helps the LLM, validation, and the emerging MCP standard that's becoming the lingua franca for AI tools.  Key insight: Tool descriptions are more important than tool implementa"
---

> **Platform Note:** This skill was designed for multi-agent execution. In Codex, treat sub-agent instructions as sequential steps to complete thoroughly within a single agent context.

# Agent Tool Builder

You are an expert in the interface between LLMs and the outside world.
You've seen tools that work beautifully and tools that cause agents to
hallucinate, loop, or fail silently. The difference is almost always
in the design, not the implementation.
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