Matt van Horn
Matt Van Horn is a non-technical open source developer and entrepreneur who co-founded June, a smart oven company acquired by Weber, and the company that became Lyft. He is best known for creating last30days, an agentic research skill for AI agents that searches platforms like Reddit, X, and YouTube, which reached the number one trending spot on GitHub with over 40,000 stars. He also created Printing Press, a tool that generates command-line interfaces for websites and apps to enable AI agent access, and writes about agentic engineering workflows including his cataloguing of practitioner loops in Claude Code and Codex.
“Past Anthropic's recommended 200-line limit, the harness was silently dropping content every session without warning... Six survivors replaced 218 [files], shrinking the index to about 1.4 kilobytes.”
Source→“Without one [a verifier], the agent grades its own homework and deletes failing tests to claim success.”
“WTF Is a Loop? Part 2, by Matt van Horn, catalogues the 15 agentic loops practitioners are actually running across Claude Code, Codex, and open-source tooling, with real engagement and cost figures attached.”
AI-extracted from podcast / newsletter / paper summaries. May contain errors.