Frontier Field Notes
Writing from the autonomous work horizon: how long an agent can work on its own, what it needs to get there, and how to tell when it's slipping. Field Notes are the long-form essays, numbered as a series. Side Quests are the short detours that didn't need one.
Field Notes
9 essaysProve the Spec Before You Write the Code with symspec
Find contradictions in structured requirements before writing code. symspec uses Z3 to prove conflicts and reports the limits of what it checked.
July 9, 20269 min readSpec VerificationCoding AgentsSMTEARSYield Engineering for Fleets of Autonomous Coding Agents
Shipping more pull requests is not the same as delivering useful work. Apply yield, rework, and defect measurements to a fleet of coding agents.
June 11, 20267 min readYieldMetricsAutonomous DeliverySelf-Improving AI Agents Will Reduce the Code You Ship
Given one sentence, an agent pulled data, ran statistics, wrote a brief and kept what it learned in six minutes. Most software we ship is plumbing it can write.
June 4, 20266 min readSelf-Improving AgentsToolsArchitectureERPAVal, a Gated Six-Phase Workflow for Claude Code Agents
ERPAVal runs Claude Code agents through six gated phases and writes what each session learned to disk, so the next run starts with yesterday's lessons.
May 14, 202615 min readAutonomous DevWorkflowClaude CodeAgent Evals That Show When Your AI Agent Is Getting Worse
Catch regressions before deployment and bad output during a run. A comparison of seven eval frameworks and the feedback loops that make them useful.
March 19, 20266 min readEvalsRegressionQualityWhy Coding Agents Need a Computer That Isn't Your Laptop
The coding agent harness is absorbing knowledge work, and laptops fail it at team scale. Agents need isolated, durable, scalable cloud compute to run for hours.
March 12, 20267 min readAgentsInfrastructureCloudThe Autonomous Work Horizon Is Doubling Every Five Months
A March 2026 analysis of METR task horizons: a 4.8-month doubling trend, its reliability limits, and why human task duration is not agent runtime.
March 5, 20266 min readAutonomyBenchmarksMETRClosing the Loop on AI-Generated Code with Automated Review
Independent AI review can catch design problems that linters miss. Build a review loop that complements tests, static analysis, and human judgment.
February 12, 20266 min readCode ReviewQualityAI-Generated CodeWhy Frontier AI Labs Are Obsessed with Coding Abilities
Code is the most general interface to the modern economy. It reaches APIs, terminals, files, and databases, so labs build agents that turn intent into action.
January 8, 20265 min readFrontier ModelsCoding AgentsEconomics
Side Quests
3 detours- Side QuestJune 11, 2026
Chip Equipment Stocks as a Lead Indicator of the AI Buildout
In the June 2026 AI hardware selloff the chip designers fell and the equipment makers did not. Equipment orders run four to six quarters ahead of demand.
- Side QuestMarch 12, 2026
A reMarkable Paper Pro CLI That Feeds Handwriting to Agents
remarkable-spec parses reMarkable .rm files, renders pen strokes, and OCRs handwriting with Vision, Textract and Opus so an agent can read annotations as text.
- Side QuestMarch 5, 2026
The Skill Budget Trap That Silently Drops Claude Code Skills
A hidden character budget silently drops Claude Code skills from context. I traced the failures, raised the budget, and added two hooks that enforce skill use.