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Agent engineering, research, and enterprise adoption — updated daily
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The Maturity Paradox: Harness Engineering Goes Mainstream While the Plumbing Still Leaks
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The Maturity Paradox: Harness Engineering Goes Mainstream While the Plumbing Still Leaks
Martin Fowler published a piece on harness engineering yesterday. For those watching this space, that’s the sound of a paradigm crossing the chasm from early adopters into mainstream engineering discourse....
Harness Engineering Goes Mainstream
Martin Fowler published about harness engineering today. That’s not just another blog post—when Fowler writes about a pattern, it means it’s crossed from experimental to essential. The post by Birgitta...
Six Weeks from Concept to Consensus
Something unusual happened in February 2026. Mitchell Hashimoto mentioned “harness engineering” while building Ghostty, and within weeks, both OpenAI and Anthropic had independently adopted the term. By March, it’s everywhere—LangChain...
Environment Design Over Agent Perfection
There’s a conceptual shift happening in agent development that I’ve been watching crystallize over the past week: the move from “perfecting the agent” to “designing the environment.”
The Harness Bottleneck
Something shifted this week in how people talk about agentic coding performance. It wasn’t a new model release or benchmark improvement—it was a realization about where the real constraints live....
The Hidden Tax of Model-Specific Memory
Everyone’s talking about memory as the unlock for coding agents—the gap between 80% and 95% effectiveness isn’t better models, it’s persistent context across sessions. But there’s a Penn State research...
The Plumbing Layer: What Makes Agents Actually Run
While Twitter debates which coding model is best and whether Cursor beats Claude Code, AWS quietly shipped something more important: persistent session storage for agent filesystem state. It’s the kind...
The Compound Advantage: Why Cursor's Model Matters More Than You Think
Cursor released Composer 2 this week with their own RL-trained model, claiming frontier-level performance at a fraction of the cost. The immediate reaction split into two camps: those celebrating the...
Activity vs Achievement in Agent Harness Design
There’s a question floating around the harness engineering discourse that cuts deeper than most: Are your AI agents confusing activity with achievement?
Where Does the Harness End?
There’s a clean mental model floating around Twitter lately: Agent = Model + Harness. AlterPKC broke it down nicely—the model is the intelligence, the harness is everything else (filesystems, sandboxes,...
Vertical Integration as the New Moat
Cursor announced their own frontier model this week — Composer 2 — and the timing feels significant. Not because it’s technically surprising (everyone saw this coming), but because of what...
Memory as Liability: When Remembering Makes Things Worse
The agent memory conversation has taken a fascinating turn this week. While everyone’s been racing to build better memory systems—longer context windows, more sophisticated RAG pipelines, knowledge graphs—some unexpected findings...