// building in public
Building in public.
One problem at a time.
I'm Richard, a cybersecurity and SaaS product manager tinkering on personal projects with AI. This is where I share what works, what breaks, and what I'd tell someone starting from zero.
Richard Muffler
PM · security · AI builder
currently building
probl.me, this blog, in public.
+ Celly, a sister product.
+ Celly, a sister product.
// what I write about · click a topic
// latest
Fresh from the workbench
pm-craft
Writing a Spec Your AI Agent Can Actually Keep Following
Most specs tell an AI agent what to do once, then get quietly ignored next session. Here's how to write one that verifies itself, from a real drift incident.
ai-development
How I Built a Claude Agent Content Pipeline (and What Broke)
I built an AI content pipeline with Claude agents defined in a single markdown file, no framework. Here's how it works and the three things that broke first.
ai-development
Prompt Injection Is Already Hiding in What AI Agents Read
Prompt injection hides in webpages, DNS records, emails, and PDFs that AI agents read. Here's what happened to me, and the defenses that actually help.