Addy Osmani is a Software Engineer at Google working on Google Cloud and Gemini. https://addyosmani.com A coding agent is the model plus everything you build around it: prompts, tools, context policies, hooks, sandboxes, feedback loops. Harness engineering is the discipline of treating that scaffolding as a first-class artifact, and tightening it every time the agent slips. Sun, 19 Apr 2026 00:00:00 +0000 https://addyosmani.com/blog/agent-harness-engineering/ https://addyosmani.com/blog/agent-harness-engineering/ AI coding agents consume documentation fundamentally differently from humans. If you're still optimizing only for human readers, you're leaving a growing share of your audience invisible to your tooling. Sat, 11 Apr 2026 00:00:00 +0000 https://addyosmani.com/blog/agentic-engine-optimization/ https://addyosmani.com/blog/agentic-engine-optimization/ Running multiple agents in parallel is not just a question of throughput. It is a new kind of cognitive labor that requires managing multiple mental models, continuous judgment calls, and an ambient anxiety tax Tue, 07 Apr 2026 00:00:00 +0000 https://addyosmani.com/blog/cognitive-parallel-agents/ https://addyosmani.com/blog/cognitive-parallel-agents/ The shift from conductor to orchestrator: how to coordinate teams of AI coding agents in real-world software workflows. From subagents to Agent Teams to purpose-built orchestration tools, this talk covers the patterns, tools, and discipline required to thrive in the era of agentic engineering. Thu, 26 Mar 2026 00:00:00 +0000 https://addyosmani.com/blog/code-agent-orchestra/ https://addyosmani.com/blog/code-agent-orchestra/ Sat, 14 Mar 2026 00:00:00 +0000 https://addyosmani.com/blog/comprehension-debt/ https://addyosmani.com/blog/comprehension-debt/ Software engineering is not about writing code anymore. It is about building the factory that builds your software. Wed, 25 Feb 2026 00:00:00 +0000 https://addyosmani.com/blog/factory-model/ https://addyosmani.com/blog/factory-model/ Two papers published in early 2026 suggest you might have just made your agent slower, more expensive, and no more accurate. The right mental model is to treat AGENTS.md as a living list of codebase smells you haven't fixed yet, not a permanent configuration. Mon, 23 Feb 2026 00:00:00 +0000 https://addyosmani.com/blog/agents-md/ https://addyosmani.com/blog/agents-md/ Bias toward action is defaulting to the smallest responsible step that produces real feedback, while pre-committing to guardrails so that being wrong is survivable and quickly correctable. Sun, 15 Feb 2026 00:00:00 +0000 https://addyosmani.com/blog/bias-towards-action/ https://addyosmani.com/blog/bias-towards-action/ More lessons learned from 14 years of engineering at Google, focusing on what truly matters beyond just writing great code. Thu, 12 Feb 2026 00:00:00 +0000 https://addyosmani.com/blog/14-more-lessons/ https://addyosmani.com/blog/14-more-lessons/ Claude Code now supports agent teams - coordinated swarms of AI agents that research, debug, and build in parallel. What was feature-flagged is now real. Here's what it means and how to use it. Thu, 05 Feb 2026 00:00:00 +0000 https://addyosmani.com/blog/claude-code-agent-teams/ https://addyosmani.com/blog/claude-code-agent-teams/