Wednesday, 18th March 2026
From Prompt Engineering to Harness Engineering: Building Infrastructure for Autonomous Agents
2025 was the year of agents. 2026 is the year of harnesses — the persistent infrastructure that gives a foundation model hands, feet, and senses. The shift is fundamental: from prompt engineering (optimizing single interactions) to harness engineering (building the systems that control long-running, autonomous agents).
[... 1,174 words]7 Mental Models for Building Agent Skills (From Anthropic’s Internal Playbook)
Anthropic just published their internal playbook for Claude Code Skills — based on hundreds of skills in active use. Buried inside the practical advice are deep mental models for building better agents. Here’s what they’re really telling you.
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