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
Your AI Agent Will Eventually Delete Prod
PocketOS lost their production database backups to a Cursor agent. Here's what runtime spend rails actually catch, what they don't, and the layered defense your agents need before production.
- 5 min read
7% of vibe-coded apps ship with wide-open databases
A 1,764-app audit found 7% had open Supabase databases and 15% of Bolt apps had hardcoded secrets. The fix takes ten minutes.
- 7 min read
Uber Burned Its 2026 AI Budget on Claude Code by April
No metering, no per-team caps, no dashboards. Uber spent its entire 2026 AI budget on Claude Code in just 4 months. The 5-step pattern behind every runaway AI bill — and the fix that stops it.
- 6 min read
MCP vs Skills: a practical decision guide for builders
I need my agent to do X. Skill or MCP? A short decision rule with worked examples for small-business agent builders.
- 6 min read
Cloudflare agents can now buy domains. The case for runtime spend rails just got concrete.
Cloudflare shipped agent flows that create accounts, buy domains via Stripe, and deploy infrastructure end-to-end. Good news for builders. Sharper case for runtime budget enforcement than any hypothetical we have used.
- 4 min read
OpenAI's guardrails don't control costs. Here's the gap.
OpenAI shipped guardrails in the Agents SDK last month. They validate behavior. They do not enforce spend. Here is the gap and how to close it.
- 4 min read
agent-sre on PyPI: what SRE for AI agents actually means
Microsoft just shipped agent-sre on PyPI. Seven packages: SLOs, error budgets, circuit breakers. Here is what it does, what it does not, and why solo builders still need agentguard47.
- 5 min read
If AI agents can spend money, who's holding the credit card?
I built a memory API agents can pay for. The actual problem isn't whether they can pay. It's per-tool caps, per-agent budgets, kill switches, and spend visibility.
- 5 min read
When Tokens Cost 12 Cents Per Million, The Bottleneck Isn't Cost. It's Control.
NVIDIA Blackwell delivers 35x lower cost per token vs Hopper. That makes AI agents cheaper to run and harder to stop. Here's why that flips the runtime guard argument upside down.
- 4 min read
AI security is now a token-burning contest. Who's watching the bill?
Simon Willison frames AI-assisted security research as proof of work: more tokens in, more bugs found. That's an economic reality. Here's what the spend curve actually looks like and how to put a floor under it.
- 4 min read
AI Token Pricing 2026: Cap Per-Token Agent Costs at Runtime
Per-token billing is coming for every AI provider within six months. Here's how your agent costs change — and how to cap them at runtime before the bill spikes.
- 5 min read
Claude Code Prompt Caching Costs: Pick the Right TTL (2026)
Claude Code has two prompt-caching TTLs, and most devs pay the pricier tier without knowing. Here's how cache writes quietly inflate your Anthropic bill — and how to cap it.
The AI agent build notes
Real costs, real tools, no fluff. M-F when I ship, publish, or learn something worth sending.