Topic
Agentguard
59 posts on agentguard — guides and lab notes from real runs on hardware we own. New posts land here automatically. Start anywhere, or grab the copy-paste prompts that ship with them.
- 6 min read
AI-powered hacking went industrial. Here's what changes if you run agents.
Google found the first AI-built zero-day in a planned mass-exploitation event. A builder's read on what changes for small operators running agents.
- 5 min read
Token budget wars are starting. Most companies are paying for vibes.
AI billing is shifting from seats and tokens to outcomes. If you cannot tie an agent run to a dollar of work, you are paying for vibes.
- 4 min read
AI Jobs vs Entry-Level Work: A Reality Check for Builders
MIT Tech Review says the AI-jobs hysteria is overstated. The real story is cost discipline, not displacement.
- 5 min read
Microsoft Told Engineers to Ease Off Claude Code
If Microsoft can't absorb agent inference costs, neither can you. Make the cap a config change, not a memo.
- 4 min read
Why Starbucks Killed Its AI Inventory Tool After 9 Months
Starbucks pulled its AI inventory tool after 9 months. Here is the pattern that killed it and three guardrails that catch it.
- 4 min read
Enterprise AI just shifted: Claude +128%, OpenAI -8%. What it means if you're building.
SaaStr data shows enterprise AI share shifting hard toward Claude. The lesson isn't pick Claude. It's stop hard-coding one vendor.
- 4 min read
AI software runs on 17% margins. SaaS runs on 70%. The token bill is the problem.
AI-native software is shipping at roughly 17% gross margins while traditional SaaS sits near 70%. The token bill ate the unit economics. Here's what's actually broken and how to claw margin back.
- 5 min read
An AI Agent in Sweden Ordered 6,000 Napkins. Here's the 12 Lines of Python That Would Have Stopped It.
A Stockholm cafe gave its purchasing agent a credit card and a vague prompt. $21,000 later it owned 6,000 napkins and no bread. Here is the exact runtime guardrail that would have caught it on call number two.
- 5 min read
I gave an autotrader $360 and 30 days. I am not adding live money yet.
The May 14 autotrader review is done. The account is up 7.7% before compute, still negative after compute, and still lagging SPY and BTC. Decision: keep V2 paper-only, add no new live money, and revisit after the next scorecard.
- 4 min read
One Agent Skill, Three Registries: PyPI, Claude, and skills.sh
Agent skills are becoming a distribution layer for developer tools. The practical move is one source package that can show up in PyPI, Claude-style skills, and skills.sh.
- 4 min read
April 2026: Every AI Subscription Plan Broke for Builders
April 2026 made one thing clear: chat subscriptions are best-effort tools. Builders need API-level budgets, rate limits, and kill switches when the work matters.
- 4 min read
Computer Use Is 45x More Expensive Than APIs. Here's When To Use Each.
Reflex.dev measured a 45x token cost gap between computer-use agents and structured APIs for the same task. Here's why, and the decision rule that keeps your bill sane.
The AI agent build notes
Real costs, real tools, no fluff. M-F when I ship, publish, or learn something worth sending.