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Code Mode: Why AI Agents Are Moving from Tool Calls to Code
The pattern seemed obvious at first: give an AI agent a list of tools, let it pick the right one for each step, and watch it work through the task.…
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Your Agent Evolved. Did Your Evals?
For a long time, the question asked about an AI system was: "Does it give the right answer?" That question makes sense when a system is a single model call…
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What Codex’s Harness Reveals About Building Agents That Actually Work
Building an agent that works in a demo is one thing. Building one that runs reliably for hours, handles ambiguous permissions, searches a hundred tools without choking on context, and…
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The Jagged Frontier Was a Measurement Error — Draft: The Surgeon-in-the-Dark Read
Shaping the flow of ideas at the frontier of cognitive systems. --- Cursor's coding assistant — a tool built to help programmers write software — recently solved Problem 6 of…
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The Two-Door Principle
Shaping the flow of ideas at the frontier of cognitive systems. --- Your dishwasher breaks. The warranty expires in two weeks. Eighteen months ago, during the last repair, the technician…
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Intelligence isn’t one thing operating alone
Shaping the flow of ideas at the frontier of cognitive systems. --- A chat window is a keyhole. You can ask one question and get one answer. You can't see…
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The Delegation Muscle and the Coordination Muscle
Shaping the flow of ideas at the frontier of cognitive systems. --- On February 12, OpenAI and Anthropic released two frontier AI agent systems within twenty minutes of each other.…
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The 70/30 Rule: Why AI Agents Fail in Production
Shaping the flow of ideas at the frontier of cognitive systems. --- A car buyer saved $4,200 by pointing an AI agent at a vehicle purchase while he sat in…
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You gave your AI agent real tools. Here’s the control layer it’s missing.
For a while, the hard part of building with AI was getting the model to understand what you wanted. Then we solved enough of that to ship agents that actually…
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The Lock-In That Has No Export Button
The Claude Code source leak — 512,000 lines pushed to a public registry by a packaging error — generated coverage worth reading carefully. Most of it split into two camps:…