---
author: "Umesh Malik"
canonical: "https://umesh-malik.com/blog/tag/tool-design"
description: "Explore articles tagged with Tool Design by Umesh Malik — AI Engineer, LLM & GenAI Developer. Learn Tool Design best practices, practical tips, and in-depth guides."
title: "Umesh Malik's Blog - Tool Design Articles | Tool Design Tutorials"
tokens: 162
generator: "scripts/generate-page-markdown.mjs"
---

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# Tool Design

1 article

 [![The browsing loop a code-review agent enters under generic tool instructions, versus the diff-anchored evidence path review-shaped instructions produce](https://umesh-malik.com/blog/writing-agent-tool-instructions-cover.png)

AI Coding Agents & DX • Aug 7, 2026

### Fix your agent tool instructions: GitHub's 20% review-cost cut

Agent tool instructions decide what your agent costs. GitHub kept the same grep/glob/view toolset, rewrote the guidance, and cut review cost by ~20%.

9 min read

Read more →](https://umesh-malik.com/blog/writing-agent-tool-instructions)