---
author: "Umesh Malik"
canonical: "https://umesh-malik.com/blog/tag/prompt-engineering"
description: "Explore articles tagged with Prompt Engineering by Umesh Malik — AI Engineer, LLM & GenAI Developer. Learn Prompt Engineering best practices, practical tips, and in-depth guides."
title: "Umesh Malik's Blog - Prompt Engineering Articles | Prompt Engineering Tutorials"
tokens: 297
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---

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# Prompt Engineering

2 articles

 [![Swapping bespoke search tools for generic grep, glob and view raised Copilot code review cost until the system prompt was rewritten to be diff-anchored](https://umesh-malik.com/blog/cut-agent-tool-call-cost-prompt-rewrite-cover.png)

AI Coding Agents & DX • Aug 14, 2026

### Cut agent tool call cost: GitHub's 20% fix was a prompt rewrite

Agent tool call cost jumped after you gave it better tools? GitHub hit that on Copilot code review and won ~20% back with a prompt rewrite, not new tools.

9 min read

Read more →](https://umesh-malik.com/blog/cut-agent-tool-call-cost-prompt-rewrite)

 [![Diagram of an LLM eval framework pipeline: tasks and configs produce runs, graders apply checks to produce grades](https://umesh-malik.com/blog/llm-eval-framework-smevals-cover.png)

LLM Engineering • Aug 4, 2026

### LLM Eval Framework: Grade Prompts, Models and Harnesses

An LLM eval framework turns vibes into scores. How smevals structures tasks, configs, runners and graders — and how to ship your first eval today.

10 min read

Read more →](https://umesh-malik.com/blog/llm-eval-framework-smevals)