Mark Heath

💻Microsoft MVP ☁️Azure & .NET developer 🎸musician ⛪️disciple 👨‍👩‍👧‍👦father of 5 🔊NAudio ⚽️Arsenal👨‍🏫Pluralsight author

[Mark Heath @mark_heath]

Recently have enjoyed exploring what GitHub Copilot can (and can't) do to help you with refactoring, modernizing and optimizing tasks for existing codebases. And so am pleased to announce my new Pluralsight course all about it https://t.co/FIzdkuOWAU

[Mark Heath @mark_heath]

@k1rallik Poor prompts lead to poor results - true
Poor results mean your prompt was poor - not necessarily
Models still sometimes flat out ignore explicit instructions (as they tacitly admit by telling you to repeat important instructions)

[Mark Heath @mark_heath]

@johndyer @Claude I tried to make @claude create an svg version of a pretty simple png logo, but despite my best efforts to coach it through exactly how to do it, the results were very disappointing

[Mark Heath @mark_heath]

@mattpocockuk Nice. I've found agents love writing ADRs but you have to be very strict in your agents.md about when to create them or you'll get three new ones for every bugfix

[Mark Heath @mark_heath]

Most dev teams have never had to worry about the problem of what happens if we have *too much* documentation, or *too many* automated tests, because we never had time to reach that point. Now AI is teaching us the hard way that yes you can have too much of a good thing

[Alexandre Mutel @xoofx]

I'm thrilled to release CodeAlta - one of the first efficient AI coding-agent TUIs built entirely in C#/.NET 🚀

I've been developing and using it daily for the past 3 months, and I hope you enjoy it as much as I do! 🤗

Retweets are highly appreciated! 🙏

CodeAlta brings you a beautiful, colorful timeline interface, multiple threads in the same workspace, a real prompt editor experience, quick file viewing/editing with syntax highlighting, in-app model provider configuration, a multi-agent-ready environment, and much more! ✨

[Mark Heath @mark_heath]

Use Artificial Intelligence if you like, but *please* use Actual Intelligence as well

[Mark Heath @mark_heath]

@optimalfocus same here. now what am I supposed to do?

[Mark Heath @mark_heath]

typical commit messages in 2026: "Phase 4, Bucket E, Slice 2b''': remediating slice 2b'' regressions"

[Mark Heath @mark_heath]

still waiting for claude code to come up with an actually useful "memory". Most of them I've had to explicitly ask it to forget (and completely delete all trace of the concept from memory)

[Mark Heath @mark_heath]

@thdxr yes, I think there should be a full time "codebase caretaker" job - no new features, just improving maintainability, observability, performance, simplifying things etc. Very hard to get upper management buy-in though

[Mark Heath @mark_heath]

Of course, agentic coding is dramatically changing the way we approach development, but I don't think it changes the importance of fundamentals such as clear architecture, excellent test coverage, readable code, etc

[Mark Heath @mark_heath]

My latest Pluralsight course is live - "Refactoring to SOLID in C# 14", with lots of strategies and techniques to help you work more effectively with legacy codebases https://t.co/YPu9vDak5M

[Mark Heath @mark_heath]

I've written a bit more about what I cover in the course here: https://t.co/gvpFq5Oz23

[Mark Heath @mark_heath]

@csharpfritz reminds me of my old school reports:
Follows instructions: Needs Improvement

[Mark Heath @mark_heath]

I never imagined that I'd be debugging markdown as part of my day-to-day development experience

[Mark Heath @mark_heath]

is the era of agentic coding going to mean the end of human-written coding tutorials? I'd be interested to know your thoughts and have written up some of my own ideas here https://t.co/KiBtuUF3Ip

[Mark Heath @mark_heath]

@SamanthaTaghoy As a good Christian I make sure to eat a creme egg every day during the Easter season, just like the Bible teaches.

[Mark Heath @mark_heath]

I love how Claude debugs my C# code by rewriting it in Python to step through!

[Mark Heath @mark_heath]

@marcjacobi it is that WASAPI capture can theoretically capture audio from a single process. I tried it myself a few years back and ran into endless problems. Claude failed as well. But I believe it should be possible

[Mark Heath @mark_heath]

Have been amazed at how much help Claude has been on some tricky NAudio tasks. But have finally found something that has completely stumped it - a problem I spent ages on a few years back and gave up on. But to be fair to it, its refusing to give up....