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Harness engineering for coding agent users

martinfowler.com

A mental model for building trust in coding agents through feedforward guides, feedback sensors, and iterative harness engineering.

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AI articles and reading

I want to start capturing my notes from important articles I'm reading about the impact of AI. AI Doesn’t Reduce Work—It Intensifies It by Aruna Ranganathan and Xingqi Maggie Ye While this may sound like a dream come true for leaders, the changes brought about by enthusiastic AI adoption c

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.NET R&D Digest (March, 2026)

This issue includes bits (or I would rather say bytes) of AI, bits of software development, operating systems, web, diagnostics, performance, C++, C#, and of course .NET and .NET Internals.

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AI Reading Notes #2

It's been about 3 months since I posted "AI Articles and reading", and I think I need to do it more regularly. Here's a bunch of quotes from the best things I've been reading / watching / listening to that are informing how my thinking about AI and the software industry is developing. On harness

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10 March 2026

News Introducing GPT-5.4 | OpenAI OpenAI released their newest update for ChatGPT, GPT-5.4 and GPT-5.4-Pro in both ChatGPT and the API. Notably, GPT-5.4 also unifies the OpenAI model family, combining standard chat and coding-specific models (the prior coding-specific variant, gpt-5.3-codex, has been replaced by gpt-5.4 in Codex). OpenAI also highlight GPT-5.4’s computer use and knowledge work capabilities, shoring up perceived shortcomings relative to competitors (especially Anthropic, who have targeted Enterprise knowledge work).

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Agent Harness Engineering

A coding agent is the model plus everything you build around it. Harness engineering treats that scaffolding as a real artifact, and it tightens every time the agent slips.

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The Middle Loop - Annie Vella

Early in my career, I took a job as a software developer at a large consultancy. Turns out the work mostly involved fixing other people’s Access databases by right-clicking and hitting “repair”. I lasted about a month before I thanked them for the opportunity, handed in my resignation, and moved on. The point is: what you spend your time on defines what you think about. What you think about is what you practice. And what you practice is what you build skill on. The title said “software developer” but the daily work said something else entirely.

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